DC1651A Analog Devices

DC1651A June 18, 2010 LTC6803-1 Battery Monitor HARDWARE/SOFTWARE USERS GUIDE DESCRIPTION0B Evaluation circuit DC1651A is a Battery Monitoring LTC6803-1 N1B EW FEATURES System to demonstrate the functional operation of the Pin compatible upgrade to LT6802-1 designs. LTC6803-1 integrated circuit. The basic operation and Robust daisy chain SPI common-mode immunity. features of this demo board are the same as the Packet Error Checking on command writes. DC1331 for the LT6802-1, including the ability to dai- 6X lower standby current. sy-chain up to 10 devices with built-in board-to-board Active pullup on S pins. ribbon-cable interconnects and selectively apply resis- Additional diagnostic features. tive loading to any cell for purposes of Passive Ba- lancing. DC1651A DEMO FEATURES 2B Controllable discharging for Passive Balancing. Protection circuitry for IC and external discharge transistors during hot plugging of cells. Graphical User Interface (GUI) screen for demon- CONFIGURATION JUMPERS stration of new features and program code devel- TOP LTC6803-1 BOTTOM opment. PORT PORT DISCHARGE SWITCHES CELLS CONNECTOR DC1651A 3BGETTING STARTED WITH ONE BOARD CONNECTED 5BSINGLE BOARD CONNECTION TO PC AND GUI Step 1. Set jumpers on DC1651A to the default posi- tions indicated in Table 1. 6BTABLE 1. JUMPER FUNCTIONS JUMPER FUNCTION DEFAULT ACTIVE POSITION GROUND POSITION POSITION Top of Stack (TOS) Active Indicates that the cells monitored by the Allows data to be passed to and from both the J4 board are at the top of the battery stack. Data Top and Bottom Ports of the board. is not transferred in or out of the Top Port of this board. J6 General Purpose I/O Active Output connected to pull-up resistor to Vreg. Forced to a logic low level. (GPIO1) Can be programmed as an input or an output. General Purpose I/O Active Output connected to pull-up resistor to Vreg. Forced to a logic low level. J7 (GPIO2) Can be programmed as an input or an output. J8 Voltage Mode (VMOD) Active Bottom SPI port is configured as normal TTL Bottom Port is configured as a current inputs voltage level inputs and outputs. Required and outputs. Required setting for all boards on setting for the board on the bottom of the a cell stack above the bottom board. battery cell stack. A 5K PULL-UP RESISTOR MUST BE CONNECTED FROM THE SDO OUTPUT LINE (CONNECTOR J2, PIN 5) TO THE LOGIC POWER RAIL OF THE CIRCUIT DRIVING THE BOTTOM SPI PORT (SEE TEXT). Step 2. Connect DC590B Quick Eval USB cable to (which must be set to Voltage Mode) must have a PC/Laptop USB port. Connect ribbon cable from 5K pull-up resistor added between the SDO line DC590B to the Bottom Port of DC1651A (J2). (J2, PIN 5) and the 3V/5V logic supply rail of the Make sure that the driver for DC590B has been driving system. This pull-up resistor was not add- downloaded from HUwww.linear.com and instUH alled on ed to the DC1651 because it cannot be present the computer. This can be verified by running when the port is configured for current mode op- Quick Eval and seeing the message that there is a eration on a multiple board monitor of a stack of missing module for this board type. Close the cells. Quick Eval program and instead launch the control Step 3. Connect the cells to be monitored to the cells program: connector J1. This connector is in two pieces. The LTC6803-1-3 GUI Vxx yyyymmdd.exe setscrew piece can be unplugged to make it safer to attach wiring from a four to twelve cell battery When the DC590B Quick Eval board recognizes the stack. The LTC6803-1 is intended to measure from String ID code from the DC1651A board, the pro- four to twelve individual cells with a total stack vol- gram will open and present the control screen. tage of 10V to 50V. This sometimes requires two launches of the GUI program to properly initialize. With fewer than 12 cells to be monitored, the bot- tom cell of the stack should always be connected A DC590B board has the required pull-up resistor as Cell 1 between terminals J1-5(+cell contact) and to the SDO line already connected. If a system J1-4(-cell contact). Terminals J1-4, and J1-1 are other than DC590 is driving the bottom port 2