1
dc1871af
DEMO MANUAL DC1871A
DESCRIPTION
LTC2995
Temperature Sensor and Dual
Voltage Monitor with Alert Outputs
Demonstration circuit 1871A features the LTC2995, a high
performance temperature and voltage monitor that has
resistor configurable alert levels.
DC1871A is designed to allow easy evaluation of the
LTC2995 and may be connected directly to the target appli-
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
cation’s analog and digital signals to measure performance.
Design files for this circuit board are available at
http://www.linear.com/demo
Figure 1. Proper Measurement Equipment Setup
DIGITAL STATUS PINS
ANALOG TEMPERATURE OUTPUT
5V
12V
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dc1871af
DEMO MANUAL DC1871A
QUICK START PROCEDURE
Jumper Settings
DS: This jumper allows the user to set the LTC2995 to use the
internal temp sensor, an external temp sensor, or alternate
between the two choices. When set to INT&EXT, VPTAT
changes every 3.5ms from the voltage corresponding to
the temperature of the internal sensor to the voltage cor-
responding to the temperature of the external temperature.
PS: This jumper selects the polarity of the VT1/VT2 pins.
Depending on the position of this jumper, the VT1 and VT2
pins can either be used to indicate OT or UT.
PS VT1 VT2
VCC UT OT
Open OT OT
GND UT UT
DIODE SELECT: Allows the user to either select the on
board FMMT3904 (Q1) or attach their own diode through
the D+/D– turrets.
LED ON/OFF: Turns on or off the digital indicator lights
that reflect the status of OV, UV, TO2, TO1.
Analog Connections
Analog signal connections are made via the row of turret
posts along the edge of the board.
GND: (6 turrets)These turrets are connected directly to
the internal ground planes.
VCC: User should connect a 2.25V to 5.5V power supply
to this turret.
VIN1: This is set up to be a 5V ±10% monitor input. This,
however, can be adjusted by changing the VH1/VL1 resis-
tors (RA1, RB1, RC1). Please refer to the LTC2995 manual
for resistor value formulas.
VIN2: This is setup to be a 12V ±10% monitor input. This,
however, can be adjusted by changing the VH2/VL2 resis-
tors (RA2, RB2, RC2). Please refer to the LTC2995 manual
for resistor value formulas.
VREF: OUTPUT ONLY. This nominally outputs 1.8V that can
drive up to ±200μA of load.
VPTAT: The voltage on this turret is proportional to the
sensor’s absolute temperature, with a slope of 4mV/k.
VPTAT can drive up to a ±200μA load and up to 1000pF
capacitive load.
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dc1871af
DEMO MANUAL DC1871A
QUICK START PROCEDURE
Digital Connections
UV: Status of the LTC2995 UV pin can be read at this
turret. If a UV fault is triggered the LED will also light up.
OV: Status of the LTC2995 OV pin can be read at this
turret. If a OV fault is triggered the LED will also light up.
TO2: Status of the LTC2995 TO2 pin can be read at this
turret. If a TO2 fault is triggered the LED will also light
up. The function of the TO2 fault is determined by the PS
jumper and the state of the VT2 pin.
TO1: Status of the LTC2995 TO1 pin can be read at this
turret. If a TO1 fault is triggered the LED will also light
up. The function of the TO1 fault is determined by the PS
jumper and the state of the VT1 pin.
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dc1871af
DEMO MANUAL DC1871A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., C0G 470pF 50V 5% 0603 AVX, 06035A471JAT2A
2 1 C2 CAP., X7R 0.1μF 16V 10% 0402 AVX, 0402YC104KAT2A
3 1 C3 CAP., X7R 22nF 50V 5% 0402 AVX, 04025C222JAT2A
4 17 E1-E17 TESTPOINT, TURRET .094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 2 JP1, JP2 HEADER, 3 PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S
6 2 JP3, JP4 HEADER, 12 PIN 0.079 DOUBLE ROW SAMTEC, TMM-106-02-L-D
7 4 LED1, LED2, LED3, LED4 LED, RED J-TYPE SMD 1206 PANASONIC, LN1251CTR
8 1 LED5 LED, GRN, J-TYPE PANASONIC, LN1351CTR
9 1 Q1 TRANS., NPN, SOT23-3 DIODE/ZETEX, MMBT3904-7-F
10 2 RA1, RA2 RES., CHIP, 4.53k, 1/16W, 1%, 1206 YAGEO, RC1206FR-074K53L
11 2 RB1, RB2 RES., CHIP, 1k, 1/16W, 5%, 1206 YAGEO, RC1206JR-071KL
12 1 RC1 RES., CHIP, 44.2k, 1/16W, 1%, 1206 YAGEO, RC1206FR-0744K2L
13 1 RC2 RES., CHIP, 115k, 1/16W, 1%, 1206 YAGEO, RC1206FR-07115KL
14 1 RTA RES., CHIP, 110k, 1/16W, 5%, 1206 YAGEO, RC1206JR-07110KL
15 1 RTB RES., CHIP, 40.2k, 1/16W, 1%, 1206 YAGEO, RC1206FR-0740K2L
16 1 RTC RES., CHIP, 30.9k, 1/16W, 1%, 1206 YAGEO, RC1206FR-0730K9L
17 5 R1, R2, R3, R4, R5 RES., CHIP, 330Ω, 1/16W, 1%, 0603 YAGEO, RC0603FR-07330RL
18 4 R6, R7, R8, R9 RES., CHIP, 10k, 1/16W, 5%, 0603 YAGEO, RC0603JR-0710KL
19 0 R10 RES., CHIP, 0402 OPT
20 1 U1 I.C., LTC2995IUD, QFN20UD-3X3 LINEAR TECH., LTC2995IUD#TRPBF
21 4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G
22 1 SHOWN ON ASSY DWG FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1871A
23 2 STENCIL BOTH SIDES STENCIL (TOP & BOTTOM) STENCIL DC1871A
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dc1871af
DEMO MANUAL DC1871A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
OT @ 100C
UT @ 0C
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTES: UNLESS OTHERWISE SPECIFIED
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
200ms DELAY
VCC
GND
INT
EXT
12V
+/-10% MONITOR 5V
+/-10% MONITOR
PS VT1 VT2
VCC UT OT
OPEN OT OT
GND UT UT
PS
DS
INT&EXT
OPEN
(QFN20UD-3X3)
VCC
VCC
VCC
VCC
VCC
VCC
VCC
VCC
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV LEO C.
PRODUCTION
2 11-29-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV LEO C.
PRODUCTION
2 11-29-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV LEO C.
PRODUCTION
2 11-29-11
__
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
11/29/2011, 03:40 PM
11
VOLTAGE AND TEMPERATURE MONITOR
KIM T.
LEO C.
N/A
LTC2995IUD
DEMO CIRCUIT 1871A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
11/29/2011, 03:40 PM
11
VOLTAGE AND TEMPERATURE MONITOR
KIM T.
LEO C.
N/A
LTC2995IUD
DEMO CIRCUIT 1871A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
11/29/2011, 03:40 PM
11
VOLTAGE AND TEMPERATURE MONITOR
KIM T.
LEO C.
N/A
LTC2995IUD
DEMO CIRCUIT 1871A
LED5
LN1351C
GRN
VCC
LED5
LN1351C
GRN
VCC
2 1
E7
D+
E7
D+
E17GND
E17GND
RB2
1k
1206
RB2
1k
1206
C1
470pF
C1
470pF JP2
ON
LED ON/OFF
OFF
JP2
ON
LED ON/OFF
OFF
1
3
2
R9
10k
R9
10k
E6
VREF
E6
VREF
R2
330
R2
330
C2
0.1uF
0402
C2
0.1uF
0402
RC1
44.2k
1206
RC1
44.2k
1206
E3
GND
E3
GND
R8
10k
R8
10k
RA1
4.53k
1206
RA1
4.53k
1206
E13 UV
E13 UV
JP1
Q1
DIODE SELECT
EXT JP1
Q1
DIODE SELECT
EXT
1
3
2
E2
VIN2
E2
VIN2
LED3
LN1251C
RED
TO2
LED3
LN1251C
RED
TO2
2 1
E8
D-
E8
D-
E15 TO1
E15 TO1
RTC
30.9k
1206
RTC
30.9k
1206
JP3
HD2X3-079
JP3
HD2X3-079
1
3
56
4
2
RTA
110k
1206
RTA
110k
1206
R7
10k
R7
10k
E5
GND
E5
GND
E1
GND
E1
GND
LED1
LN1251C
RED
OV
LED1
LN1251C
RED
OV
2 1
R6
10k
R6
10k
R1
330
R1
330 R5
330
R5
330
C3
22nF
0402
C3
22nF
0402
R4
330
R4
330
LED4
LN1251C
RED
TO1
LED4
LN1251C
RED
TO1
2 1
E12 OV
E12 OV
RB1
1k
1206
RB1
1k
1206
E11GND
E11GND
Q1
MMBT3904
Q1
MMBT3904
1
23
RC2
115k
1206
RC2
115k
1206
E14 TO2
E14 TO2
E16 VPTAT
E16 VPTAT
R3
330
R3
330
E4
VIN1
E4
VIN1
R10
OPT
0402
R10
OPT
0402
RTB
40.2k
1206
RTB
40.2k
1206
JP4
HD2X3-079
JP4
HD2X3-079
1
3
56
4
2
U1
LTC2995IUD
U1
LTC2995IUD
D+ 6
D- 7
VPTAT 8
VH2
2
VL2
3
VT2
4VT1
5
VL1
1
VCC 9
GND
10
VREF 11
TO1 12
TO2 13
OV 14
VH1
20
PS
19
DS
18
GND
17
TMR 16
UV 15
GND
21
LED2
LN1251C
RED
UV
LED2
LN1251C
RED
UV
2 1
E9
2.25V - 5.5V
VCC
E9
2.25V - 5.5V
VCC
RA2
4.53k
1206
RA2
4.53k
1206
E10GND
E10GND
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dc1871af
DEMO MANUAL DC1871A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0312 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
