NOA3302 Digital Proximity Sensor with Ambient Light Sensor and Interrupt Description The NOA3302 combines an advanced digital proximity sensor and LED driver with an ambient light sensor (ALS) and tri-mode I2C interface with interrupt capability in an integrated monolithic device. Multiple power management features and very low active sensing power consumption directly address the power requirements of battery operated mobile phones and mobile internet devices. The proximity sensor measures reflected light intensity with a high degree of precision and excellent ambient light rejection. The NOA3302 enables a proximity sensor system with a 32:1 programmable LED drive current range and a 30 dB overall proximity detection threshold range. The photopic light response, dark current compensation and high sensitivity of the ambient light sensor eliminates inaccurate light level detection, insuring proper backlight control even in the presence of dark cover glass. The NOA3302 is ideal for improving the user experience by enhancing the screen interface with the ability to measure distance for near/far detection in real time and the ability to respond to ambient lighting conditions to control display backlight intensity. http://onsemi.com 1 CWDFN8 CU SUFFIX CASE 505AJ PIN CONNECTIONS VDD 1 8 SCL VSS 2 7 SDA LED_GND 3 6 NC LED 4 5 INT (Top View) Features * Proximity Sensor, LED driver and ALS in One Device * Very Low Power Consumption ORDERING INFORMATION Stand-by Current 5 mA (monitoring I2C interface only, VDD = 3 V) ALS Operational Current 50 mA Proximity Sensing Average Operational Current 100 mA Average LED Sink Current 75 mA Device Package Shipping NOA3302CUTAG* CWDFN8 (Pb-Free) 2500 / Tape & Reel For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. *Temperature Range: -40C to 80C. Proximity Sensing * Proximity Detection Distance Threshold I2C Programmable with * * * 12-bit Resolution and Four integration Time Ranges (15-bit effective resolution) Effective for Measuring Distances up to 100 mm and Beyond Excellent IR and Ambient Light Rejection Including Sunlight (up to 50k lux) and CFL Interference Programmable LED Drive Current from 5 mA to 160 mA in 5 mA steps, No External Resistor Required * * * * * Ambient Light Sensing * * ALS Senses Ambient Light and Provides a 16-bit I2C Output Count on the Bus Directly Proportional to the Ambient Light Intensity (c) Semiconductor Components Industries, LLC, 2013 March, 2013 - Rev. 1 1 Photopic Spectral Response Nearly Matches Human Eye Dynamic Dark Current Compensation Linear Response Over the Full Operating Range Senses Intensity of Ambient Light from 0.05 lux to 52k lux with 21-bit Effective Resolution (16-bit converter) Continuously Programmable Integration Times (6.25 ms, 12.5 ms, 25 ms... to 800 ms) Precision on-Chip Oscillator (counts equal 0.1 lux at 100 ms integration time) Publication Order Number: NOA3302/D NOA3302 Additional Features * * * * * Fast mode - 400 kHz High speed mode - 3.4 MHz No external components required except the IR LED and power supply Decoupling Caps 8-lead CUDFN 2.0 x 2.0 x 0.6 mm clear package These Devices are Pb-Free, Halogen Free/BFR Free and are RoHS Compliant * Programmable interrupt function including independent * upper and lower threshold detection or threshold based hysteresis for proximity and or ALS Proximity persistence feature reduces interrupts by providing hysteresis to filter fast transients such as camera flash Automatic power down after single measurement or continuous measurements with programmable interval time for both ALS and PS function Wide operating voltage range (2.3 V to 3.6 V) Wide operating temperature range (-40C to 80C) I2C serial communication port Standard mode - 100 kHz * * Applications * Senses human presence in terms of distance and senses ambient light conditions, saving display power in applications such as: Smart phones, mobile internet devices, MP3 players, GPS Mobile device displays and backlit keypads VDD_I2C VDD 1 mF NOA3302 MCU INTB ADC DSP INTB SCL SCL SDA hn SDA VDD Reference Diode ALS Photodiode I2C Interface & Control Osc ADC 22 mF IR LED LED Drive DSP LED hn Proximity Photodiode LED_GND VSS Figure 1. NOA3302 Application Block Diagram Table 1. PIN FUNCTION DESCRIPTION Pin Pin Name Description 1 VDD Power pin. 2 VSS Ground pin. 3 LED_GND 4 LED IR LED output pin. 5 INT Interrupt output pin, open-drain. 6 NC Not connected. 7 SDA Bi-directional data signal for communications with the I2C master. 8 SCL External I2C clock supplied by the I2C master. Ground pin for IR LED driver. http://onsemi.com 2 1 mF NOA3302 Table 2. ABSOLUTE MAXIMUM RATINGS Rating Symbol Value Unit Input power supply VDD 4.0 V Input voltage range Vin -0.3 to VDD + 0.2 V Output voltage range Vout -0.3 to VDD + 0.2 V TJ(max) 100 C TSTG -40 to 80 C ESD Capability, Human Body Model (Note 1) ESDHBM 2 kV ESD Capability, Charged Device Model (Note 1) ESDCDM 500 V ESD Capability, Machine Model (Note 1) ESDMM 200 V Moisture Sensitivity Level MSL 3 - Lead Temperature Soldering (Note 2) TSLD 260 C Maximum Junction Temperature Storage Temperature Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. This device incorporates ESD protection and is tested by the following methods: ESD Human Body Model tested per EIA/JESD22-A114 ESD Charged Device Model tested per ESD-STM5.3.1-1999 ESD Machine Model tested per EIA/JESD22-A115 Latchup Current Maximum Rating: 100 mA per JEDEC standard: JESD78 2. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D Table 3. OPERATING RANGES Rating Symbol Min VDD 2.3 Power supply voltage Typ Max Unit 3.6 V Power supply current, stand-by mode (VDD = 3.0 V) IDDSTBY_3.0 5 mA Power supply current, stand-by mode (VDD = 3.6 V) IDDSTBY_3.6 10 mA Power supply average current, ALS operating 100 ms integration time and 500 ms intervals IDDALS 50 Power supply average current, PS operating 300 ms integration time and 100 ms intervals IDDPS 100 ILED LED average sink current, PS operating at 300 ms integration time and 100 ms intervals and LED current set at 50 mA I2C signal voltage (Note 3) 75 mA mA VDD_I2C 1.6 2.0 V Low level input voltage (VDD_I2C related input levels) VIL -0.3 0.3 VDD_I2C V High level input voltage (VDD_I2C related input levels) VIH 0.7 VDD_I2C VDD_I2C + 0.2 V Hysteresis of Schmitt trigger inputs Vhys 0.1 VDD_I2C Low level output voltage (open drain) at 3 mA sink current (INTB) VOL Input current of IO pin with an input voltage between 0.1 VDD and 0.9 VDD 1.8 mA V 0.2 VDD_I2C V II -10 10 mA Output low current (INTB) IOL 3 - mA Operating free-air temperature range TA -40 80 C 3. The I2C interface is functional to 3.0 V, but timing is only guaranteed up to 2.0 V. High Speed mode is guaranteed to be functional to 2.0 V. http://onsemi.com 3 NOA3302 Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.3 V, 1.7 V < VDD_I2C < 1.9 V, -40C < TA < 80C, 10 pF < Cb < 100 pF) (See Note 4) Parameter LED pulse current LED pulse current step size Symbol Min ILED_pulse 5 ILED_pulse_step Typ Max Unit 160 mA 5 mA LED pulse current accuracy ILED_acc -20 +20 % Interval Timer Tolerance Tolf_timer -35 +35 % SCL clock frequency fSCL_std 10 100 kHz fSCL_fast 100 400 fSCL_hs 100 3400 THD;STA_std 4.0 - tHD;STA_fast 0.6 - tHD;STA_hs 0.160 - Hold time for START condition. After this period, the first clock pulse is generated. Low period of SCL clock High period of SCL clock SDA Data hold time SDA Data set-up time Rise time of both SDA and SCL (input signals) (Note 5) Fall time of both SDA and SCL (input signals) (Note 5) Rise time of SDA output signal (Note 5) Fall time of SDA output signal (Note 5) Set-up time for STOP condition tLOW_std 4.7 - tLOW_fast 1.3 - tLOW_hs 0.160 - tHIGH_std 4.0 - tHIGH_fast 0.6 - tHIGH_hs 0.060 - tHD;DAT_d_std 0 3.45 tHD;DAT_d_fast 0 0.9 tHD;DAT_d_hs 0 0.070 tSU;DAT_std 250 - tSU;DAT_fast 100 - tSU;DAT_hs 10 tr_INPUT_std 20 1000 tr_INPUT_fast 20 300 tr_INPUT_hs 10 40 tf_INPUT_std 20 300 tf_INPUT_fast 20 300 tf_INPUT_hs 10 40 tr_OUT_std 20 300 tr_OUT_fast 20 + 0.1 Cb 300 tr_OUT_hs 10 80 tf_OUT_std 20 300 tf_OUT_fast 20 + 0.1 Cb 300 tf_OUT_hs 10 80 tSU;STO_std 4.0 - tSU;STO_fast 0.6 - tSU;STO_hs 0.160 - Bus free time between STOP and START condition tBUF_std 4.7 - tBUF_fast 1.3 - tBUF_hs 0.160 - mS mS mS mS nS nS nS nS nS mS mS 4. Refer to Figure 2 and Figure 3 for more information on AC characteristics. 5. The rise time and fall time are dependent on both the bus capacitance (Cb) and the bus pull-up resistor Rp. Max and min pull-up resistor values are determined as follows: Rp(max) = tr (max)/(0.8473 x Cb) and Rp(min) = (Vdd_I2C - Vol(max))/Iol. 6. Cb = capacitance of one bus line, maximum value of which including all parasitic capacitances should be less than 100 pF. Bus capacitance up to 400 pF is supported, but at relaxed timing. http://onsemi.com 4 NOA3302 Table 4. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over 2.3 V < VDD < 3.3 V, 1.7 V < VDD_I2C < 1.9 V, -40C < TA < 80C, 10 pF < Cb < 100 pF) (See Note 4) (continued) Symbol Min Max Unit Capacitive load for each bus line (including all parasitic capacitance) (Note 6) Parameter Cb 10 Typ 100 pF Noise margin at the low level (for each connected device - including hysteresis) VnL 0.1 VDD - V Noise margin at the high level (for each connected device - including hysteresis) VnH 0.2 VDD - V 4. Refer to Figure 2 and Figure 3 for more information on AC characteristics. 5. The rise time and fall time are dependent on both the bus capacitance (Cb) and the bus pull-up resistor Rp. Max and min pull-up resistor values are determined as follows: Rp(max) = tr (max)/(0.8473 x Cb) and Rp(min) = (Vdd_I2C - Vol(max))/Iol. 6. Cb = capacitance of one bus line, maximum value of which including all parasitic capacitances should be less than 100 pF. Bus capacitance up to 400 pF is supported, but at relaxed timing. Table 5. OPTICAL CHARACTERISTICS (Unless otherwise specified, these specifications are for VDD = 3.3 V, TA = 25C) Parameter Symbol Min Typ Max Unit AMBIENT LIGHT SENSOR Spectral response, peak (Note 7) lp 560 nm Spectral response, low -3 dB lc_low 510 nm Spectral response, high -3 dB lc_high 610 nm Dynamic range DRALS Maximum Illumination (ALS operational but saturated) Ev_Max Resolution, Counts per lux, Tint = 800 ms CR800 80 counts Resolution, Counts per lux, Tint = 100 ms CR100 10 counts Resolution, Counts per lux, Tint = 6.25 ms CR6.25 6.25 counts Illuminance responsivity, green 560 nm LED, Ev = 100 lux, Tint = 100 ms Rv_g100 1000 counts Illuminance responsivity, green 560 nm LED, Ev = 1000 lux, Tint = 100 ms Rv_g1000 10000 counts Dark current, Ev = 0 lux, Tint = 100 ms Rvd 0.05 0 0 52k lux 120k lux 3 counts PROXIMITY SENSOR Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 6:1 DPS_1200_WHITE 100 mm Detection range, Tint = 600 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 6:1 DPS_600_WHITE 85 mm Detection range, Tint = 300 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 6:1 DPS_300_WHITE 60 mm Detection range, Tint = 150 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), White Reflector (RGB = 220, 224, 223), SNR = 6:1 DPS_150_WHITE 35 mm Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), Grey Reflector (RGB = 162, 162, 160), SNR = 6:1 DPS_1200_GREY 70 mm Detection range, Tint = 1200 ms, ILED = 100 mA, 860 nm IR LED (OSRAM SFH4650), Black Reflector (RGB = 16, 16, 15), SNR = 6:1 DPS_1200_BLACK 35 mm Saturation power level PDMAX 1.0 mW/cm2 Measurement resolution, Tint = 150 ms MR150 12 bits Measurement resolution, Tint = 300 ms MR300 13 bits Measurement resolution, Tint = 600 ms MR600 14 bits Measurement resolution, Tint = 1200 ms MR1200 15 bits 7. Refer to Figure 4 for more information on spectral response. http://onsemi.com 5 NOA3302 Figure 2. AC Characteristics, Standard and Fast Modes Figure 3. AC Characteristics, High Speed Mode http://onsemi.com 6 NOA3302 TYPICAL CHARACTERISTICS Fluorescent (5000K) 0.9 0.8 ALS 0.7 Human Eye White LED (5600K) 0.6 0.5 Fluorescent (2700K) 0.4 0.3 0.2 Incandescent (2850K) 700 800 900 1000 0 0.5 1.0 WAVELENGTH (nm) -50 -60 -70 -80 -90 10 20 30 -30 40 -40 50 -50 60 -60 70 -70 80 -80 90 -100 -90 100 110 120 10 20 30 40 50 60 70 80 90 100 -110 Q 6 SIDE VIEW 120 5 7 8 130 -130 90o -140 -150 -160 4 -90 o 2 110 -120 SIDE VIEW 130 -140 140 -150 150 -160 160 -170 180 170 0 Q 1 -130 -10 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 -100 3 -110 -120 -20 TOP VIEW Figure 6. ALS Response to White Light vs. Angle 6 -40 0 -10 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 Figure 5. ALS Light Source Dependency (Normalized to Fluorescent Light) 5 -20 2.0 RATIO Figure 4. ALS Spectral Response (Normalized) -30 1.5 -90 o 90o 140 -170 180 170 160 150 4 600 7 500 3 400 8 200 300 2 0.1 0 1 OUTPUT CURRENT (Normalized) 1.0 TOP VIEW Figure 7. ALS Response to IR vs. Angle 8K 1200 7K 1000 ALS COUNTS ALS COUNTS 6K 5K 4K 3K 800 600 400 2K 200 1K 0 0 100 200 300 400 500 600 700 0 800 0 10 20 30 40 50 60 70 80 90 100 110 Ev (lux) Ev (lux) Figure 8. ALS Linearity 0-700 lux Figure 9. ALS Linearity 0-100 lux http://onsemi.com 7 NOA3302 TYPICAL CHARACTERISTICS 120 25 20 80 ALS COUNTS ALS COUNTS 100 60 40 0 1 2 3 4 6 5 7 8 10 9 0 11 1.5 2.0 Figure 11. ALS Linearity 0-2 lux 2.5 12 K PROXIMITY SENSOR VALUE 20mA 60mA 100mA 30 K 160mA 25 K 20 K 15 K 10 K 5K 0 20 40 60 80 100 120 140 20mA 10 K 60mA 100mA 8K 160mA 6K 4K 2K 0 160 0 50 100 150 200 250 DISTANCE (mm) DISTANCE (mm) Figure 12. PS Response vs. Distance and LED Current (1200 ms Integration Time, Grey Reflector (RGB = 162, 162, 160)) Figure 13. PS Response vs. Distance and LED Current (300 ms Integration Time, White Reflector (RGB = 220, 224, 223)) 5000 20mA 10 K PROXIMITY SENSOR VALUE PROXIMITY SENSOR VALUE PROXIMITY SENSOR VALUE 1.0 Figure 10. ALS Linearity 0-10 lux 35 K 60mA 100mA 8K 160mA 6K 4K 2K 0 0.5 Ev (lux) 40 K 12 K 0 Ev (lux) 45 K 0 10 5 20 0 15 0 20 40 60 80 100 120 140 160 4500 20mA 4000 60mA 100mA 3500 160mA 3000 2500 2000 1500 1000 500 0 0 20 40 60 80 100 DISTANCE (mm) DISTANCE (mm) Figure 14. PS Response vs. Distance and LED Current (300 ms Integration Time, Grey Reflector (RGB = 162, 162, 160)) Figure 15. PS Response vs. Distance and LED Current (300 ms Integration Time, Black Reflector (RGB = 16, 16, 15)) http://onsemi.com 8 NOA3302 TYPICAL CHARACTERISTICS -30 -40 No Ambient -50 -60 -70 -80 -90 50 60 70 80 90 100 -110 -120 2K 120 -130 0 50 100 150 200 -140 -150 -160 250 REFLECTOR DISTANCE (mm) Figure 16. PS Ambient Rejection TINT = 300 ms, ILED = 100 mA, White Reflector (RGB = 220, 224, 223) 160 150 -90 o 90o TOP VIEW 300 90 250 80 70 200 IDD (mA) ALS+PS 60 50 40 PS 30 20 150 PS 50 ALS 2.0 ALS+PS 100 2.5 3.0 3.5 0 4.0 ALS 2.0 2.5 3.0 3.5 4.0 VDD (V) VDD (V) Figure 18. Supply Current vs. Supply Voltage ALS TINT = 100 ms, TR = 500 ms PS TINT = 300 ms, TR = 100 ms Figure 19. Supply Current vs. Supply Voltage ALS TINT = 100 ms, TR = 500 ms PS TINT = 1200 ms, TR = 50 ms 1.2 ALS RESPONSE (Normalized) IDD (mA) -170 180 170 140 Figure 17. PS Response to IR vs. Angle 100 10 0 SIDE VIEW 130 1 0 Q 110 6 -100 4K 5 6K 40 4 10K lux CFL (3000K) 30 7 10K lux Incandescent (2700K) 8K 20 3 50K lux Halogen (3300K) 10 8 10 K -10 0 -20 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 2 PROXIMITY SENSOR VALUE 12 K 1.0 0.8 0.6 100 Lux 50 Lux 20 Lux 10 Lux 5 Lux 0.4 0.2 0 0 20 40 60 80 TEMPERATURE (C) Figure 20. ALS Response vs. Temperature http://onsemi.com 9 100 NOA3302 DESCRIPTION OF OPERATION I L + C ntI k @ T int Proximity Sensor Architecture NOA3302 combines an advanced digital proximity sensor, LED driver, ambient light sensor and a tri-mode I2C interface as shown in Figure 1. The LED driver draws a modulated current through the external IR LED to illuminate the target. The LED current is programmable over a wide range. The infrared light reflected from the target is detected by the proximity sensor photo diode. The proximity sensor employs a sensitive photo diode fabricated in ON Semiconductor's standard CMOS process technology. The modulated light received by the on-chip photodiode is converted to a digital signal using a variable slope integrating ADC with a default resolution (at 300 ms) of 13-bits, unsigned. The signal is processed to remove all unwanted signals resulting in a highly selective response to the generated light signal. The final value is stored in the PS_DATA register where it can be read by the I2C interface. Where: Ik = 73 (for fluorescent light) Ik = 106 (for incandescent light) Hence the intensity of the ambient fluorescent light (in lux): I L + C nt73 @ T int I L + C nt106 @ T int For example let: Cnt = 7300 Tint = 100 mS Intensity of ambient fluorescent light, IL(in lux): I L + 730073 @ 100 mS (eq. 3) (eq. 4) IL = 1000 lux The ambient light sensor contained in the NOA3302 employs a second photo diode with its own proprietary photopic filter limiting extraneous photons, and thus performing as a band pass filter on the incident wave front. The filter only transmits photons in the visible spectrum which are primarily detected by the human eye. The photo response of this sensor is as shown in Figure 4. The ambient light signal detected by the photo diode is converted to digital signal using a variable slope integrating ADC with a resolution of 16-bits, unsigned. The ADC value is stored in the ALS_DATA register where it can be read by the I2C interface. Equation 1 shows the relationship of output counts Cnt as a function of integration constant Ik, integration time Tint (in seconds) and the intensity of the ambient light, IL (in lux), at room temperature (25C). I2C Interface The NOA3302 acts as an I2C slave device and supports single register and block register read and write operations. All data transactions on the bus are 8 bits long. Each data byte transmitted is followed by an acknowledge bit. Data is transmitted with the MSB first. Figure 21 shows an I2C write operation. Write transactions begin with the master sending an I2C start sequence followed by the seven bit slave address (NOA3302 = 0x37) and the write(0) command bit. The NOA3302 will acknowledge this byte transfer with an appropriate ACK. Next the master will send the 8 bit register address to be written to. Again the NOA3302 will acknowledge reception with an ACK. Finally, the master will begin sending 8 bit data segment(s) to be written to the NOA3302 register bank. The NOA3302 will send an ACK after each byte and increment the address pointer by one in preparation for the next transfer. Write transactions are terminated with either an I2C STOP or with another I2C START (repeated START). Register Address Device Address A[6:0] WRITE ACK 0 D[7:0] Register Data ACK 0000 0110 0 7 Start Condition (eq. 2) and the intensity of the ambient incandescent light (in lux): Ambient Light Sensor Architecture 011 0111 0 0x6E (eq. 1) 8 Figure 21. I2C D[7:0] 8 Write Command http://onsemi.com 10 ACK 0000 0000 0 Stop Condition NOA3302 Figure 22 shows an I2C read command sent by the master to the slave device. Read transactions begin in much the same manner as the write transactions in that the slave address must be sent with a write(0) command bit. Device Address Register Address A[6:0] WRITE 011 0111 0 0x6E ACK 0 D[7:0] Register Data ACK 0000 0110 0 7 8 D[7:0] ACK 0000 0000 0 8 Stop Condition Start Condition Device Address Register Data [A] A[6:0] READ 011 0111 1 0x6F ACK 0 D[7:0] Register Data [A+1] ACK bbbb bbbb 0 7 8 D[7:0] NACK bbbb bbbb 1 8 Start Condition Stop Condition Figure 22. I2C Read Command The NOA3302 also supports I2C high-speed mode. The transition from standard or fast mode to high-speed mode is initiated by the I2C master. A special reserve device address is called for and any device that recognizes this and supports high speed mode immediately changes the performance characteristics of its I/O cells in preparation for I2C transactions at the I2C high speed data protocol rates. From then on, standard I2C commands may be issued by the master, including repeated START commands. When the I2C master terminates any I2C transaction with a STOP sequence, the master and all slave devices immediately revert back to standard/fast mode I/O performance. By using a combination of high-speed mode and a block write operation, it is possible to quickly initialize the NOA3302 I2C register bank. After the NOA3302 sends an ACK, the master sends the register address as if it were going to be written to. The NOA3302 will acknowledge this as well. Next, instead of sending data as in a write, the master will re-issue an I2C START (repeated start) and again send the slave address and this time the read(1) command bit. The NOA3302 will then begin shifting out data from the register just addressed. If the master wishes to receive more data (next register address), it will ACK the slave at the end of the 8 bit data transmission, and the slave will respond by sending the next byte, and so on. To signal the end of the read transaction, the master will send a NACK bit at the end of a transmission followed by an I2C STOP. http://onsemi.com 11 NOA3302 NOA3302 Data Registers NOA3302 operation is observed and controlled by internal data registers read from and written to via the external I2C interface. Registers are listed in Table 6. Default values are set on initial power up or via a software reset command (register 0x01). The I2C slave address of the NOA3302 is 0x37. Table 6. NOA3302 DATA REGISTERS Address Type Name Description 0x00 R PART_ID 0x01 RW RESET 0x02 RW INT_CONFIG 0x0F RW PS_LED_CURRENT 0x10 RW PS_TH_UP_MSB PS Interrupt upper threshold, most significant bits 0x11 RW PS_TH_UP_LSB PS Interrupt upper threshold, least significant bits 0x12 RW PS_TH_LO_MSB PS Interrupt lower threshold, most significant bits 0x13 RW PS_TH_LO_LSB PS Interrupt lower threshold, least significant bits 0x14 RW PS_FILTER_CONFIG 0x15 RW PS_CONFIG 0x16 RW PS_INTERVAL PS Interval time configuration 0x17 RW PS_CONTROL PS Operation mode control 0x20 RW ALS_TH_UP_MSB ALS Interrupt upper threshold, most significant bits 0x21 RW ALS_TH_UP_LSB ALS Interrupt upper threshold, least significant bits 0x22 RW ALS_TH_LO_MSB ALS Interrupt lower threshold, most significant bits 0x23 RW ALS_TH_LO_LSB ALS Interrupt lower threshold, least significant bits 0x24 RW RESERVED 0x25 RW ALS_CONFIG 0x26 RW ALS_INTERVAL ALS Interval time configuration 0x27 RW ALS_CONTROL ALS Operation mode control 0x40 R INTERRUPT 0x41 R PS_DATA_MSB PS measurement data, most significant bits 0x42 R PS_DATA_LSB PS measurement data, least significant bits 0x43 R ALS_DATA_MSB ALS measurement data, most significant bits 0x44 R ALS_DATA_LSB ALS measurement data, least significant bits NOA3302 part number and revision IDs Software reset control Interrupt pin functional control settings PS LED pulse current (5, 10, ..., 160 mA) PS Filter configuration PS Integration time configuration Reserved ALS Integration time configuration Interrupt status PART_ID Register (0x00) The PART_ID register provides part and revision identification. These values are hard-wired at the factory and can not be modified. Table 7. PART_ID REGISTER (0x00) Bit 7 6 5 4 Part number ID Field Field Bit Default Part number ID 7:4 1001 Revision ID 3:0 NA 3 2 1 Revision ID Description Part number identification Silicon revision number http://onsemi.com 12 0 NOA3302 RESET Register (0x01) Software reset is controlled by this register. Setting this register followed by an I2C_STOP sequence will immediately reset the NOA3302 to the default startup standby state. Triggering the software reset has virtually the same effect as cycling the power supply tripping the internal Power on Reset (POR) circuitry. Table 8. RESET REGISTER (0x01) Bit 7 6 5 4 3 2 1 NA Field Field NA SW_reset 0 SW_reset Bit Default Description 7:1 XXXXXXX Don't care 0 0 Software reset to startup state INT_CONFIG Register (0x02) INT_CONFIG register controls the external interrupt pin function. Table 9. INT_CONFIG REGISTER (0x02) Bit 7 6 5 4 3 2 NA Field Field NA auto_clear polarity Bit Default Description 7:2 XXXXXX Don't care 1 1 0 0 1 0 auto_clear polarity 0 When an interrupt is triggered, the interrupt pin remains asserted until cleared by an I2C read of INTERRUPT register 1 Interrupt pin state is updated after each measurement 0 Interrupt pin active low when asserted 1 Interrupt pin active high when asserted PS_LED_CURRENT Register (0x0F) The LED_CURRENT register controls how much current the internal LED driver sinks through the IR LED during modulated illumination. The current sink range is a baseline 5 mA plus a binary weighted value of the LED_Current register times 5 mA, for an effective range of 5 mA to 160 mA in steps of 5 mA. The default setting is 50 mA. Table 10. PS_LED_CURRENT REGISTER (0x0F) Bit 7 Field 6 5 4 3 NA Field Bit Default NA 7:5 XXX LED_Current 4:0 01001 2 1 0 LED_Current Description Don't care Defines current sink during LED modulation. Binary weighted value times 5 mA plus 5 mA. PS_TH Registers (0x10 - 0x13) With hysteresis not enabled (see PS_CONFIG register), the PS_TH registers set the upper and lower interrupt thresholds of the proximity detection window. Interrupt functions compare these threshold values to data from the PS_DATA registers. Measured PS_DATA values outside this window will set an interrupt according to the INT_CONFIG register settings. With hysteresis enabled, threshold settings take on a different meaning. If PS_hyst_trig is set, the PS_TH_UP register sets the upper threshold at which an interrupt will be set, while the PS_TH_LO register then sets the lower threshold hysteresis value where the interrupt would be cleared. Setting the PS_hyst_trig low reverses the function such that the PS_TH_LO register sets the lower threshold at which an interrupt will be set and the PS_TH_UP represents the hysteresis value at which the interrupt would be subsequently cleared. Hysteresis functions only apply in "auto_clear" INT_CONFIG mode. The controller software must ensure the settings for LED current, sensitivity range, and integration time (LED pulses) are appropriate for selected thresholds. Setting thresholds to extremes (default) effectively disables interrupts. http://onsemi.com 13 NOA3302 Table 11. PS_TH_UP REGISTERS (0x10 - 0x11) Bit 7 6 5 4 3 2 1 0 1 0 PS_TH_UP_MSB(0x10), PS_TH_UP_LSB(0x11) Field Field Bit Default Description PS_TH_UP_MSB 7:0 0xFF Upper threshold for proximity detection, MSB PS_TH_UP_LSB 7:0 0xFF Upper threshold for proximity detection, LSB Table 12. PS_TH_LO REGISTERS (0x12 - 0x13) Bit 7 6 5 4 3 2 PS_TH_LO_MSB(0x12), PS_TH_LO_LSB(0x13) Field Field Bit Default Description PS_TH_LO_MSB 7:0 0x00 Lower threshold for proximity detection, MSB PS_TH_LO_LSB 7:0 0x00 Lower threshold for proximity detection, LSB PS_FILTER_CONFIG Register (0x14) of N measurements must exceed threshold settings in order to set an interrupt. The default setting of 1 out of 1 effectively turns the filter off and any single measurement exceeding thresholds can trigger an interrupt. (Note a setting of 0 is interpreted the same as a 1). PS_FILTER_CONFIG register provides a hardware mechanism to filter out single event occurrences or similar anomalies from causing unwanted interrupts. Two 4 bit registers (M and N) can be set with values such that M out Table 13. PS_FILTER_CONFIG REGISTER (0x14) Bit 7 6 5 4 3 2 filter_N Field Field 1 0 filter_M Bit Default filter_N 7:4 0001 Filter N Description filter_M 3:0 0001 Filter M PS_CONFIG Register (0x15) sensitivity of the detector and directly affects the power consumed by the LED. The default is 300 ms integration period. Hyst_enable and hyst_trigger work with the PS_TH (threshold) settings to provide jitter control of the INT function. Proximity measurement sensitivity is controlled by specifying the integration time. The integration time sets the number of LED pulses during the modulated illumination. The LED modulation frequency remains constant with a period of 1.5 ms. Changing the integration time affects the Table 14. PS_CONFIG REGISTER (0x15) Bit 7 6 NA Field Field NA 5 4 3 2 hyst_enable hyst_trigger NA NA Bit Default 7:6 XX hyst_enable 5 0 hyst_trigger 4 0 NA 3:2 X integration_time 1:0 01 Description Don't Care 0 Disables hysteresis 1 Enables hysteresis 0 Lower threshold with hysteresis 1 Upper threshold with hysteresis Don't Care 00 150 ms integration time 01 300 ms integration time 10 600 ms integration time 11 1200 ms integration time http://onsemi.com 14 1 0 integration_time NOA3302 PS_INTERVAL Register (0x16) The PS_INTERVAL register sets the wait time between consecutive proximity measurements in PS_Repeat mode. The register is binary weighted times 5 in milliseconds with the special case that the register value 0x00 specifies 5 ms. The range is therefore 5 ms to 1.28 s. The default startup value is 0x0A (50 ms). Table 15. PS_INTERVAL REGISTER (0x16) Bit 7 6 5 4 3 2 1 0 interval Field Field Interval Bit Default 7:0 0x0A Description 0x01 to 0xFF Interval time between measurement cycles. Binary weighted value times 5 ms plus a 5 ms offset. PS_CONTROL Register (0x17) The PS_CONTROL register is used to control the functional mode and commencement of proximity sensor measurements. The proximity sensor can be operated in either a single shot mode or consecutive measurements taken at programmable intervals. Both single shot and repeat modes consume a minimum of power by immediately turning off LED driver and sensor circuitry after each measurement. In both cases the quiescent current is less than the IDDSTBY parameter. These automatic power management features eliminate the need for power down pins or special power down instructions. Table 16. PS_CONTROL REGISTER (0x17) Bit 7 6 5 4 3 2 NA Field Field 1 0 PS_Repeat PS_OneShot Bit Default 7:2 XXXXXX PS_Repeat 1 0 Initiates new measurements at PS_Interval rates PS_OneShot 0 0 Triggers proximity sensing measurement. In single shot mode this bit clears itself after cycle completion. NA Description Don't care ALS_TH Registers (0x20 - 0x23) With hysteresis not enabled (see ALS_CONFIG register), the ALS_TH registers set the upper and lower interrupt thresholds of the ambient light detection window. Interrupt functions compare these threshold values to data from the ALS_DATA registers. Measured ALS_DATA values outside this window will set an interrupt according to the INT_CONFIG register settings. With hysteresis enabled, threshold settings take on a different meaning. If the ALS_hyst_trig is set, the ALS_TH_UP register sets the upper threshold at which an interrupt will be set, while the ALS_TH_LO register then sets the lower threshold hysteresis value where the interrupt would be cleared. Setting the ALS_hyst_trig low reverses the function such that the ALS_TH_LO register sets the lower threshold at which an interrupt will be set and the ALS_TH_UP represents the hysteresis value at which the interrupt would be subsequently cleared. Hysteresis functions only apply in "auto_clear" INT_CONFIG mode. Table 17. ALS_TH_UP REGISTERS (0x20 - 0x21) Bit 7 6 5 4 3 2 ALS_TH_UP_MSB(0x20), ALS_TH_UP_LSB(0x21) Field Field Bit Default Description ALS_TH_UP_MSB 7:0 0xFF Upper threshold for ALS detection, MSB ALS_TH_UP_LSB 7:0 0xFF Upper threshold for ALS detection, LSB http://onsemi.com 15 1 0 NOA3302 Table 18. ALS_TH_LO REGISTERS (0x22 - 0x23) Bit 7 6 5 4 3 2 1 0 ALS_TH_LO_MSB(0x22), ALS_TH_LO_LSB(0x23) Field Field Bit Default Description ALS_TH_LO_MSB 7:0 0x00 Lower threshold for ALS detection, MSB ALS_TH_LO_LSB 7:0 0x00 Lower threshold for ALS detection, LSB ALS_CONFIG Register (0x25) The ALS_CONFIG register controls the ambient light measurement sensitivity by specifying the integration time. Hyst_enable and hyst_trigger work with the ALS_TH (threshold) settings to provide jitter control of the INT function. Integration times below 50 ms are not recommended for normal operation as 50/60 Hz rejection will be impacted. They may be used in testing or if 50/60 Hz rejection is not a concern. Table 19. ALS_CONFIG REGISTER (0x25) Bit 7 6 NA Field Field 5 4 3 hyst_enable hyst_trigger reserved Bit Default 7:6 XX hyst_enable 5 0 hyst_trigger 4 0 reserved 3 0 2:0 100 NA integration_time 2 1 0 integration_time Description Don't Care 0 Disables hysteresis 1 Enables hysteresis 0 Lower threshold with hysteresis 1 Upper threshold with hysteresis Must be set to 0 000 6.25 ms integration time 001 12.5 ms integration time 010 25 ms integration time 011 50 ms integration time 100 100 ms integration time 101 200 ms integration time 110 400 ms integration time 111 800 ms integration time ALS_INTERVAL Register (0x26) The ALS_INTERVAL register sets the interval between consecutive ALS measurements in ALS_Repeat mode. The register is binary weighted times 50 in milliseconds. The range is 0 ms to 3.15 s. The register value 0x00 and 0 ms translates into a continuous loop measurement mode at any integration time. The default startup value is 0x0A (500 ms). Table 20. ALS_INTERVAL REGISTER (0x26) Bit 7 5 4 3 NA Field Field interval 6 2 interval Bit Default 5:0 0x0A Description Interval time between ALS measurement cycles http://onsemi.com 16 1 0 NOA3302 ALS_CONTROL Register (0x27) each measurement. In both cases the quiescent current is less than the IDDSTBY parameter. These automatic power management features eliminate the need for power down pins or special power down instructions. For accurate measurements at low light levels (below approximately 3 lux) ALS readings must be taken at least once per second and the first measurement after a reset (software reset or power cycling) should be ignored. The ALS_CONTROL register is used to control the functional mode and commencement of ambient light sensor measurements. The ambient light sensor can be operated in either a single shot mode or consecutive measurements taken at programmable intervals. Both single shot and repeat modes consume a minimum of power by immediately turning off sensor circuitry after Table 21. ALS_CONTROL REGISTER (0x27) Bit 7 6 5 4 3 2 NA Field Field NA Bit Default 1 0 ALS_Repeat ALS_OneShot Description 7:2 XXXXXX ALS_Repeat 1 0 Don't care Initiates new measurements at ALS_Interval rates ALS_OneShot 0 0 Triggers ALS sensing measurement. In single shot mode this bit clears itself after cycle completion. INTERRUPT Register (0x40) The INTERRUPT register displays the status of the interrupt pin and if an interrupt was caused by the proximity or ambient light sensor. If "auto_clear" is disabled (see INT_CONFIG register), reading this register also will clear the interrupt. Table 22. INTERRUPT REGISTER (0x40) Bit 7 6 5 NA Field Field 4 3 2 1 0 INT ALS_intH ALS_intL PS_intH PS_intL Bit Default Description NA 7:5 XXX INT 4 0 Status of external interrupt pin (1 is asserted) ALS_intH 3 0 Interrupt caused by ALS exceeding maximum ALS_intL 2 0 Interrupt caused by ALS falling below the minimum PS_intH 1 0 Interrupt caused by PS exceeding maximum PS_intL 0 0 Interrupt caused by PS falling below the minimum Don't care PS_DATA Registers (0x41 - 0x42) The PS_DATA registers store results from completed proximity measurements. When an I2C read operation begins, the current PS_DATA registers are locked until the operation is complete (I2C_STOP received) to prevent possible data corruption from a concurrent measurement cycle. Table 23. PS_DATA REGISTERS (0x41 - 0x42) Bit 7 6 5 4 3 2 PS_DATA_MSB(0x41), PS_DATA_LSB(0x42) Field Field Bit Default Description PS_DATA_MSB 7:0 0x00 Proximity measurement data, MSB PS_DATA_LSB 7:0 0x00 Proximity measurement data, LSB http://onsemi.com 17 1 0 NOA3302 ALS_DATA Registers (0x43 - 0x44) The ALS_DATA registers store results from completed ALS measurements. When an I2C read operation begins, the current ALS_DATA registers are locked until the operation is complete (I2C_STOP received) to prevent possible data corruption from a concurrent measurement cycle. Table 24. ALS_DATA REGISTERS (0x43 - 0x44) Bit 7 6 5 4 3 2 ALS_DATA_MSB(0x43), ALS_DATA_LSB(0x44) Field Bit Default ALS_DATA_MSB Field 7:0 0x00 ALS measurement data, MSB Description ALS_DATA_LSB 7:0 0x00 ALS measurement data, LSB http://onsemi.com 18 1 0 NOA3302 Proximity Sensor Operation NOA3302 operation is divided into three phases: power up, configuration and operation. On power up the device initiates a reset which initializes the configuration registers to their default values and puts the device in the standby state. At any time, the host system may initiate a software reset by writing 0x01 to register 0x01. A software reset performs the same function as a power-on-reset. The configuration phase may be skipped if the default register values are acceptable, but typically it is desirable to change some or all of the configuration register values. Configuration is accomplished by writing the desired configuration values to registers 0x02 through 0x17. Writing to configuration registers can be done with either individual I2C byte-write commands or with one or more I2C block write commands. Block write commands specify the first register address and then write multiple bytes of data in sequence. The NOA3302 automatically increments the register address as it acknowledges each byte transfer. Proximity sensor measurement is initiated by writing appropriate values to the CONTROL register (0x17). Sending an I2C_STOP sequence at the end of the write signals the internal state machines to wake up and begin the next measurement cycle. Figures 23 and 24 illustrate the activity of key signals during a proximity sensor measurement cycle. The cycle begins by starting the precision oscillator and powering up and calibrating the proximity sensor receiver. Next, the IR LED current is modulated according to the LED current setting at the chosen LED frequency and the values during both the on and off times of the LED are stored (illuminated and ambient values). Finally, the proximity reading is calculated by subtracting the ambient value from the illuminated value and storing the result in the 16 bit PS_Data register. In One-shot mode, the PS receiver is then powered down and the oscillator is stopped (unless there is an active ALS measurement). If Repeat mode is set, the PS receiver is powered down for the specified interval and the process is repeated. With default configuration values (receiver integration time = 300 ms), the total measurement cycle will be less than 2 ms. I2C Stop 50-200 ms PS Power 9ms 0-100 ms 4MHz Osc On ~600 ms LED Burst 8 clks 12 ms Integration Integration Time 100-150 ms Data Available Figure 23. Proximity Sensor One-Shot Timing Interval I2C Stop PS Power 50-200 ms 9ms 4MHz Osc On LED Burst Integration (Repeat) 0-100 ms ~600 ms 8 clks 12 ms Integration Time 100-150 ms Data Available Figure 24. Proximity Sensor Repeat Timing http://onsemi.com 19 NOA3302 Ambient Light Sensor Operation The ALS configuration is accomplished by writing the desired configuration values to registers 0x02 and 0x20 through 0x27. Writing to configuration registers can be done with either individual I2C byte-write commands or with one or more I2C block write commands. Block write commands specify the first register address and then write multiple bytes of data in sequence. The NOA3302 automatically increments the register address as it acknowledges each byte transfer. ALS measurement is initiated by writing appropriate values to the CONTROL register (0x27). Sending an I2C_STOP sequence at the end of the write signals the internal state machines to wake up and begin the next measurement cycle. Figures 25 and 26 illustrate the activity of key signals during an ambient light sensor measurement cycle. The cycle begins by starting the precision oscillator and powering up the ambient light sensor. Next, the ambient light measurement is made for the specified integration time and the result is stored in the 16 bit ALS Data register. If in One-shot mode, the ALS is powered down and awaits the next command. If in Repeat mode the ALS is powered down, the interval is timed out and the operation repeated. There are some special cases if the interval timer is set to less than the integration time. For continuous mode, the interval is set to 0 and the ALS makes continuous measurements with only a 5 ms delay between integration times and the ALS remains powered up. If the interval is set equal to or less than the integration time (but not to 0), there is a 10 ms time between integrations and the ALS remains powered up. I2C Stop ALS Power 150-200ms 5ms 50-100ms 4MHz Osc On 10ms Integration Integration Time 100-150ms Data Available Figure 25. ALS One-Shot Timing Interval I2C Stop ALS Power 0-25ms 5ms 50-100ms 4MHz Osc On Integration 10ms Integration Time Data Available Figure 26. ALS Repeat Timing NOTE: (Repeat) 100-150ms If Interval is set to 0 (continuous) the time between integrations is 5 ms and power stays on. If Interval is set to to the integration time (but not 0) the time between integrations is 10 ms and power stays on. If Interval is set to > integration time the time between integrations is the interval and the ALS powers down. http://onsemi.com 20 NOA3302 Example Programming Sequence The following pseudo code configures the NOA3302 proximity sensor in repeat mode with 50 ms wait time between each measurement and then runs it in an interrupt driven mode. When the controller receives an interrupt, the interrupt determines if the interrupts was caused by the proximity sensor and if so, reads the PS_Data from the device, sets a flag and then waits for the main polling loop to respond to the proximity change. external subroutine I2C_Read_Byte (I2C_Address, Data_Address); external subroutine I2C_Read_Block (I2C_Address, Data_Start_Address, Count, Memory_Map); external subroutine I2C_Write_Byte (I2C_Address, Data_Address, Data); external subroutine I2C_Write_Block (I2C_Address, Data_Start_Address, Count, Memory_Map); subroutine Initialize_PS () { MemBuf[0x02] = 0x02; // INT_CONFIG assert interrupt until cleared MemBuf[0x0F] = 0x09; // PS_LED_CURRENT 50mA MemBuf[0x10] = 0x8F; // PS_TH_UP_MSB MemBuf[0x11] = 0xFF; // PS_TH_UP_LSB MemBuf[0x12] = 0x70; // PS_TH_LO_MSB MemBuf[0x13] = 0x00; // PS_TH_LO_LSB MemBuf[0x14] = 0x11; // PS_FILTER_CONFIG turn off filtering MemBuf[0x15] = 0x01; // PS_CONFIG 300us integration time MemBuf[0x16] = 0x0A; // PS_INTERVAL 50ms wait MemBuf[0x17] = 0x02; // PS_CONTROL enable continuous PS measurements MemBuf[0x20] = 0xFF; // ALS_TH_UP_MSB MemBuf[0x21] = 0xFF; // ALS_TH_UP_LSB MemBuf[0x22] = 0x00; // ALS_TH_LO_MSB MemBuf[0x23] = 0x00; // ALS_TH_LO_LSB MemBuf[0x25] = 0x04; // ALS_CONFIG 100ms integration time MemBuf[0x26] = 0x00; // ALS_INTERVAL continuous measurement mode MemBuf[0x27] = 0x02; // ALS_CONTROL enable continuous ALS measurements I2C_Write_Block (I2CAddr, 0x02, 37, MemBuf); } subroutine I2C_Interupt_Handler () { // Verify this is a PS interrupt INT = I2C_Read_Byte (I2CAddr, 0x40); if (INT == 0x11 || INT == 0x12) { // Retrieve and store the PS data PS_Data_MSB = I2C_Read_Byte (I2CAddr, 0x41); PS_Data_LSB = I2C_Read_Byte (I2CAddr, 0x42); NewPS = 0x01; } } subroutine main_loop () { I2CAddr = 0x37; NewPS = 0x00; Initialize_PS (); loop { // Do some other polling operations if (NewPS == 0x01) { NewPS = 0x00; // Do some operations with PS_Data } } } http://onsemi.com 21 NOA3302 Physical Location of Photodiode Sensors The physical locations of the NOA3302 proximity sensor and ambient light sensor photodiodes are shown in Figure 27. PS ALS 0.10 mm x 0.10 mm Pin 1 1.1 mm 0.15 mm x 0.15 mm 0.88 mm 1.06 mm Figure 27. Photodiode Locations http://onsemi.com 22 NOA3302 PACKAGE DIMENSIONS CWDFN8, 2x2, 0.5P CASE 505AJ ISSUE O 2X NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b APPLIES TO PLATED TERMINAL AND IS MEASURED BETWEEN 0.10 AND 0.20 MM FROM THE TERMINAL TIP. 4. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE TERMINALS. 0.10 C A B D E DIM A A1 A3 b D D2 E E2 e K L PIN ONE REFERENCE 2X TOP VIEW A 0.05 C 0.08 C NOTE 4 0.10 C A3 A1 SIDE VIEW C D2 1 8X 4 SEATING PLANE L RECOMMENDED MOUNTING FOOTPRINT* 8 5 e e/2 8X 8X 1.70 E2 K MILLIMETERS MIN MAX 0.60 0.70 0.00 0.05 0.20 REF 0.15 0.25 2.00 BSC 1.45 1.70 2.00 BSC 0.75 1.00 0.50 BSC 0.15 --- 0.20 0.40 b 0.10 C A B 0.05 C 0.52 1.00 2.30 NOTE 3 BOTTOM VIEW 1 0.50 PITCH 8X 0.27 DIMENSIONS: MILLIMETERS *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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