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 dc1871af 1 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. dc1871af 2 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. dc1871af 3 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 dc1871af 4 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 dc1871af 5 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 dc1871af 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