DC1871A - Demo Manual

DEMO MANUAL DC1871A
LTC2995
Temperature Sensor and Dual
Voltage Monitor with Alert Outputs
DESCRIPTION
Demonstration circuit 1871A features the LTC2995, a high
performance temperature and voltage monitor that has
resistor configurable alert levels.
cation’s analog and digital signals to measure performance.
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.
Design files for this circuit board are available at
http://www.linear.com/demo
5V
12V
DIGITAL STATUS PINS
ANALOG TEMPERATURE OUTPUT
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1871A
QUICK START PROCEDURE
Jumper Settings
Analog Connections
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 corresponding to the temperature of the external temperature.
Analog signal connections are made via the row of turret
posts along the edge of the board.
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
VCC
Open
GND
VT1
UT
OT
UT
VT2
OT
OT
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.
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 resistors (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 resistors (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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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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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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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
A
B
C
E1
PS
5
3
1
E5
DS
5
3
1
VT2
OT
OT
UT
18
19
3
2
1
20
4
5
5
2. INSTALL SHUNTS AS SHOWN.
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTES: UNLESS OTHERWISE SPECIFIED
VT1
UT
OT
UT
JP4
HD2X3-079
6
4
2
RTA
110k
1206
RTB
40.2k
1206
RTC
30.9k
1206
E6
VREF
JP3
HD2X3-079
6
4
2
PS
VCC
OPEN
GND
INT
INT&EXT
EXT
VCC
VCC
OPEN
GND
RA1
4.53k
1206
RA2
4.53k
1206
VCC
RB1
1k
1206
RB2
1k
1206
E4
RC1
44.2k
1206
E3
RC2
115k
1206
E2
GND
4
DS
PS
VL2
VH2
VL1
VH1
VT2
VT1
C2
0.1uF
0402
VCC
TMR
VPTAT
TO1
TO2
UV
OV
D-
D+
16
200ms DELAY
C3
22nF
0402
0402
CUSTOMER NOTICE
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
LEO C.
KIM T.
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TITLE: SCHEMATIC
TECHNOLOGY
DATE:
N/A
SIZE
GND
VPTAT
TO1
TO2
UV
OV
GND
GND
VCC
2.25V - 5.5V
LTC2995IUD
1
DEMO CIRCUIT 1871A
11/29/2011, 03:40 PM
IC NO.
SHEET 1
2
REV.
OF 1
VOLTAGE AND TEMPERATURE MONITOR
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E17
E16
E11
8
R10
OPT
UT @ 0C
LED5
LN1351C
GRN
VCC
R5
330
E15
R9
10k
OT @ 100C
LED4
LN1251C
RED
TO1
R4
330
VCC
E10
E14
R8
10k
LED3
LN1251C
RED
TO2
R3
330
JP2
OFF
LED ON/OFF
ON
12
R7
10k
LED2
LN1251C
RED
UV
R2
330
1
2
3
E9
LEO C.
13
R6
10k
VCC
LED1
LN1251C
RED
OV
R1
330
VCC
VCC
DATE
11-29-11
APPROVED
E13
E8
DESCRIPTION
PRODUCTION
E12
C1
470pF
Q1
MMBT3904
3
2
2
REV
15
VCC
E7
D-
__
ECO
1
REVISION HISTORY
14
7
6
(QFN20UD-3X3)
U1
LTC2995IUD
DIODE SELECT
1
Q1
2
3
EXT
JP1
D+
1
5V
+/-10% MONITOR
GND VIN1
1
2
12V
+/-10% MONITOR
GND VIN2
1
2
2
1
2
3
1
2
D
4
9
VCC
11
VREF
10
21 GND
17 GND
GND
1
2
5
A
B
C
D
DEMO MANUAL DC1871A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1871A
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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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6
Linear Technology Corporation
LT 0312 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
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