Linear Technology DC1871A Guía de configuración rápida

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 signalsto 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

12V

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dc1871af

DEMO MANUAL DC1871A

QUICK START PROCEDURE

Jumper Settings

DS: This jumperallows theuser toset theLTC2995 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

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

INT&EXT

OPEN

(QFN20UD-3X3)

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

11/29/2011, 03:40 PM

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

11/29/2011, 03:40 PM

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

11/29/2011, 03:40 PM

VOLTAGE AND TEMPERATURE MONITOR

KIM T.

LEO C.

N/A

LTC2995IUD

DEMO CIRCUIT 1871A

LED5

LN1351C

GRN

VCC

LED5

LN1351C

GRN

VCC

2 1

D+

E17GND

RB2

1206

RB2

1206

470pF

470pF JP2

LED ON/OFF

OFF

JP2

LED ON/OFF

OFF

10k

VREF

330

0.1uF

0402

0.1uF

0402

RC1

44.2k

1206

RC1

44.2k

1206

GND

10k

RA1

4.53k

1206

RA1

4.53k

1206

E13 UV

JP1

DIODE SELECT

EXT JP1

DIODE SELECT

EXT

VIN2

LED3

LN1251C

RED

TO2

LED3

LN1251C

RED

TO2

2 1

D-

E15 TO1

RTC

30.9k

1206

RTC

30.9k

1206

JP3

HD2X3-079

JP3

HD2X3-079

RTA

110k

1206

RTA

110k

1206

10k

GND

LED1

LN1251C

RED

LED1

LN1251C

RED

2 1

10k

330

330 R5

330

22nF

0402

22nF

0402

330

LED4

LN1251C

RED

TO1

LED4

LN1251C

RED

TO1

2 1

E12 OV

RB1

1206

RB1

1206

E11GND

MMBT3904

RC2

115k

1206

RC2

115k

1206

E14 TO2

E16 VPTAT

330

VIN1

R10

OPT

0402

R10

OPT

0402

RTB

40.2k

1206

RTB

40.2k

1206

JP4

HD2X3-079

JP4

HD2X3-079

LTC2995IUD

D+ 6

D- 7

VPTAT 8

VH2

VL2

VT2

4VT1

VL1

VCC 9

GND

VREF 11

TO1 12

TO2 13

OV 14

VH1

GND

TMR 16

UV 15

GND

LED2

LN1251C

RED

LED2

LN1251C

RED

2 1

2.25V - 5.5V

VCC

2.25V - 5.5V

VCC

RA2

4.53k

1206

RA2

4.53k

1206

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

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

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