
WIRELESS & SENSING
Revision 4 February 4, 2014 © 2014 Semtech Corporation www.semtech.com
1
Ultra Low Power, Four Channels
Capacitive Proximity/Button Solution
G
ENERAL
D
ESCRIPTION
The SX9500 is a low-cost, very low power 4-channel
capacitive controller that can operate either as a proximity or
button sensor. The SX9500 includes sophisticated on-chip
auto-calibration circuitry to regularly perform sensitivity
adjustments, maintaining peak performance over a wide
variation of temperature, humidity and noise environments,
providing simplified product development and enhanced
performance.
The SX9500 operates directly from an input supply voltage of
2.7 to 5.5V, and includes a separate I2C serial bus supply
input to enable communication with 1.8 – 5.5V hosts. The
I2C serial communication bus reports proximity or touch
detection and is used to facilitate parameter settings
adjustment. Upon a proximity detection, the NIRQ output
asserts, enabling the user to either determine the relative
proximity distance, or simply obtain an indication of
detection.
A dedicated transmit enable (TXEN) pin is available to
synchronize capacitive measurements for applications that
require synchronous detection, enabling very low supply
current and high noise immunity by only measuring proximity
when requested.
K
EY
P
RODUCT
F
EATURES
2.7 – 5.5V Input Supply Voltage
Capacitive Sensor Inputs
Down to 0.08 fF Capacitance Resolution
Stable Proximity & Touch Sensing With Temperature
Capacitance Offset Compensation to 30pF
Active Sensor Guarding
Automatic Calibration
Ultra Low Power Consumption:
Active Mode: 170 uA
Doze Mode: 18 uA
Sleep Mode: 2.5 uA
400KHz I2C Serial Interface
Four programmable I2C Sub-Addresses
Input Levels Compatible with 1.8V Host Processors
Open Drain NIRQ Interrupt pin
Three (3) Reset Sources: POR, NRST pin, Soft Reset
-40°C to +85°C Operation
Compact Size: 3 x 3mm Thin QFN package
Pb & Halogen Free, RoHS/WEEE compliant
A
PPLICATIONS
• Notebooks
• Tablets
• Mobile Appliances
O
RDERING
I
NFORMATION
Part Number Package
Marking
SX9500IULTRT
QFN-20 ZND8
SX9500EVKA Eval. Kit
1
3000 Units/reel
T
YPICAL
A
PPLICATION CIRCUIT