DEMO MANUAL DC1785B LTC2991 I2C Temperature, Voltage and Current Monitor Description Demonstration circuit 1785B features the LTC®2991, a high performance temperature, voltage and current monitor that uses an I2C interface for communication. It offers sub-millivolt voltage resolution, 1% current measurement and 1°C temperature accuracy. to measure performance. The exposed ground planes allow proper grounding to prototype circuitry. After evaluating with Linear Technology’s software, the digital signals can be connected to the end application’s processor/controller for development of the serial interface. DC1785B is a member of Linear Technology‘s QuikEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2991 and may be connected directly to the target application’s analog signals while using the DC590 USB Serial Controller board and supplied software Design files for this circuit board are available at http://www.linear.com/demo/DC1785B L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. INPUTS RIBBON CABLE TO DC590 CONTROLLER Figure 1. Proper Measurement Equipment Set-Up dc1785bfa 1 DEMO MANUAL DC1785B quick start procedure Connect the DC1785B to a DC590 USB Serial Controller using the supplied 14-conductor ribbon cable. Connect the DC590 to host PC with a standard USB A/B cable. Run the evaluation software supplied with DC590 or downloaded from http://www.linear.com/software. The correct program will be loaded automatically. Click the COLLECT button to start reading the input voltage. Details on software features are documented in the control panel’s help menu. Software Set-Up The legend for each input type icon is included below. Single-Ended (default) Differential Diode Temperature Input sampling can also be turned on and off by left clicking the label of the corresponding input. When an input is off, the values box below the label will be shaded and the value will stop updating. The DC1785B software is designed to give the user access to all LTC2991 functionality and features. There are several options that may be accessed both through right and left clicks. Graph Settings Input Settings To pan the graph, hold down the right mouse button while hovering over the graph and move the mouse in the direction of desired motion. The graph will cease to auto-scroll after a pan has be initiated, to reactivate the auto-scroll double left click anywhere on the graph. By default, all eight inputs are set as single-ended. This may be modified by either left clicking the input type picture to cycle through the options or right clicking the picture to bring up a list of options and left clicking to select. By default, the QuikEval software will graph V1. To begin graphing a different input, left click the values box of the input to be graphed. Figure 2. Software Screenshot dc1785bfa 2 DEMO MANUAL DC1785B quick start procedure To zoom the graph, left click and drag. To undo any zoom and re-initiate auto-scroll, double left click anywhere on the graph. Tools There are two tools included in the software package; both are accessible under the tools menu in the software. Statistics: The statistics window lists some basic information about the gathered values. It gives mean, standard deviation, min, max and crest factor. The statistics can be reset with the reset button. PWM: The PWM window allows the user to configure the PWM functionality of the LTC2991. The DC1785B includes a red LED next to the PWM turret which reflects the duty cycle of the PWM pin. The pin needs to be enabled in this window in order for proper functionality to be achieved. This window also allows the user to set the PWM threshold. Please see the LTC2991 data sheet for an explanation of the PWM pin functionality. HARDware Set-Up Jumper Settings V1, V2, V7, V8 – (Default VOLT, VOLT, VOLT, VOLT). These jumpers can be toggled between VOLT and TEMP. VOLT connects the corresponding input on the LTC2991 with the corresponding turret for an external input. TEMP connects the corresponding input to MMBT (V1 and V2). Please note that the jumpers should be moved in pairs, V1 and V2 should both be connected either to VOLT or TEMP and V7 and V8 should also be both connected to either VOLT or TEMP. Once set the proper selection should also be made inside the QuikEval software in the mode selection box, to reflect any changes made. Power – (Default DC590) EXTVCC allows the user to provide the VCC voltage (2.9V to 5V) to the LTC2991 at turret EXTVCC while DC590(5V) powers the LTC2991 with 5V from the DC590. State of VCC can be seen through red LED D1. ADR0, ADR1, ADR2 – (Default LOW, LOW, LOW) These jumpers are used to select the I2C address for the LTC2991. When used with QuikEval, the correct address should also be selected from within the software. Connection to DC590 Serial Controller J1 is the power and digital interface connector. Connect to DC590 serial controller with supplied 14-conductor ribbon cable. dc1785bfa 3 DEMO MANUAL DC1785B quick start procedure Analog Connections Digital Connections Analog signal connections are made via the row of turret posts along the edge of the board. Also, when connecting the board to an existing circuit the exposed ground planes along the edges of the board may be used to form a solid connection between grounds. PWM – PWM output pin configurable through the QuikEval software. State of the PWM pin is reflected quantitatively through the PWM LED at D2. GND – (8 turrets) These turrets are connected directly to the internal ground planes. EXTVCC – This turret allows the user to provide power to the LTC2991. Select power jumper accordingly. V1, V2, V3, V4, V5, V6, V7, V8 – These turrets are used to provide input voltage to the monitor when the corresponding jumpers are set to the VOLT position. SDA, SCL – I2C signals brought out to turrets. If DC1785B is to be run without a DC590 connected or with an alternative microprocessor, I2C signals can be driven at these points. If DC590 is not used R4 and R5 (Backside of board) can be populated with appropriate I2C pull-up values. GPO – General purpose output pin can be toggled through QuikEval software. dc1785bfa 4 DEMO MANUAL DC1785B parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 0 C1, C2, C3, C4 (OPT) Capacitor, 0603 OPT 2 2 C5, C6 Capacitor, 0.1µF, 25V, X7R, 10%, 0603 TDK, C1608X7R1E104K (Bal to #1787A) 3 1 D1 LED, Red, J-Type, SMD, Tape/Reel, 1208 Panasonic, LN1251CTR 4 1 D2 LED, Green, J-Type, SMD, Tape/Reel, 1208 Panasonic, LN1351CTR 5 19 E1-E13, E16-E21 Turret, Testpoint, 0.065 Mill-Max, 2308-2-00-80-00-00-07-0 6 2 E14, E15 Turret, Testpoint, 0.095 Mill-Max, 2501-2-00-80-00-00-07-0 7 8 JP1-JP8 Header, 3-Pin, 0.079, Single Row Samtec, TMM-103-02-L-S 8 1 J1 Connector, Header 14POS 2mm Vert Gold Molex, 87831-1420 9 1 Q1 Transistor, PNP, –40V, –200MA, SOT23-3 Diodes/Zetex, FMMT3906TA 10 1 Q2 Transistor, NPN, 40V, 350MW, SMD, SOT23-3 Diodes Inc., MMBT3904-7-F 11 1 Q3 MOSFET, N-Channel, 60V, 115mA, SOT23-3 Diodes/Zetex, 2N7002TA 12 3 R1, R2, R3 Resistor, Chip 4.99k, 0.06W, 1%, 0603 Yageo, RC0603FR-074K99L 13 0 R4, R5 (OPT) Resistor, 0603 OPT 14 2 R6, R7 Resistor, Chip, 330Ω, 0.06W, 5%, 0603 Yageo, RC0603JR-07330RL 15 2 R8, R9 Bal to #1765A Resistor, Chip, 1k, 0.06W, 5%, 0603 Yageo, RC0603JR-071KL 16 2 TP1, TP2 Testpoint, Test pad Component Corp., TP-107-02-1 17 1 U1 IC, Temperature, Voltage, Current Monitor MSOP(16)-MS Linear Technology, LTC2991CMS#PBF 18 1 U2 IC, EEPROM, 2kbit, 400kHz, TSSOP-8 Microchip, 24LC025-I/ST 19 8 XJP1-XJP8 Shunt, .079" Center Samtec, 2SN-BK-G dc1785bfa 5 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 V8 GND GND GND GND E13 E12 E11 E10 E9 E8 JP4 GND VOLT V8 E7 JP3 V7 TEMP VOLT E6 E5 E4 V7 V6 V5 V4 V3 E3 E2 JP2 V2 TEMP VOLT V2 E1 JP1 V1 TEMP VOLT V1 3 2 1 3 2 1 3 2 1 3 2 1 5 Q2 MMBT3904-7-F Q1 MMBT3906-7-F 8 7 6 5 4 3 2 V8 V7 V6 V5 V4 V3 V2 V1 9 GND VCC 16 VCC C5 ADR2 ADR1 ADR0 SDA 4 SCL PWM 0.1uF NOTE: UNLESS OTHERWISE SPECIFIED. 1. ALL RESISTORS 0603. 2. ALL CAPACITORS 0603. C4 (OPT) C3 (OPT) C2 (OPT) C1 (OPT) 1 U1 LTC2991CMS 15 14 13 10 11 12 VCC PWM 3 2 1 JP5 LOW HIGH ADR2 3 3 VCC 3 2 1 JP6 ADR1 LOW HIGH VCC JP7 ADR0 VCC CUSTOMER NOTICE LOW HIGH R3 4.99K 1% 330 R7 5 6 7 8 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C:\PADS PROJECTS\1785B\SCH\1785B_REV1.DSN 0.1uF C6 4 3 2 SCALE = NONE LEO C VCC V+ TP1 E15 J1 NC EEGND EESCL EESDA EEVCC MISO SDA/MOSI SCK/SCL CS 5V 1K E21 E20 E19 E16 GND GND DATE: N/A SIZE LTC2991CMS 1 SHEET 1 DEMO CIRCUIT 1785B Aug 28, 2014 IC NO. 1 REV. OF 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PWM GPO TECHNOLOGY PWM 1K R9 DC590B I2C INTERFACE DC590B(5V) EXTVCC VUNREG JP8 DATE Aug 28, 2014 LEO C 1 APPROVED EXTVCC 2.9V - 5.5V GND SDA SCL E14 TP2 POWER R8 14 12 11 9 10 5 7 4 6 2 1 3 2 1 SDA SCL TITLE: SCHEMATIC VSS Q3 2N7002TA PWM GRN D2 VSS A2 A1 1 APPROVALS SDA SCL WP A0 SDA SCL 330 R6 U2 24LC025-I/ST VCC REVISION HISTORY DESCRIPTION JP5, JP6, JP7 Shunts move to Low Replaced LED's R5 (OPT) VCC 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. 3 2 1 WP R1 R2 4.99K 4.99K 1% 1% D1 B VCC RED R4 (OPT) VCC ECO REV 2 GND TEMP 4 GND 13 GND 8 6 3 D 5 A B C D DEMO MANUAL DC1785B Schematic Diagram dc1785bfa DEMO MANUAL DC1785B Revision History REV DATE DESCRIPTION A 10/14 Board revision B, corrected jumper settings (JP5, JP6, JP7) PAGE NUMBER 1 dc1785bfa 7 DEMO MANUAL DC1785B 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 dc1785bfa 8 Linear Technology Corporation LT 1014 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2011