DC1393B DC1393B JULY 1, 2009 LTC6802-2 Battery Monitor HARDWARE/SOFTWARE USERS GUIDE DESCRIPTION Evaluation circuit DC1393B is a Battery Monitoring In addition, each individual cell connection has a soft- System to demonstrate the functional operation of the ware controlled discharge transistor. This allows the LTC6802-2 integrated circuit. The LTC6802-2 is a implementation of precision cell charging algorithms complete battery monitoring IC that can measure as including charge shedding of over-voltage cells. many as 12 series connected cells with a total voltage A group of up to ten DC1393B boards can be managed of 60V. A simple SPI serial interface is used to com- through the USB port of a PC using an on screen con- municate battery state information to a system control trol panel available from LTC. processor. LTC6802-2 REV C/D FEATURES Use of an isolated serial interface allows monitoring of Q completely separate battery cell packs or a series stack 12-bit accurate voltage measurement of 12 battery cells (60V maximum/board) of cells. Stacking of cells permits the monitoring of Q 4-bit addressable serial interface for high cell count each individual cell in systems requiring 100s of volts systems (16 boards x 12 cells = 192 Cells) from the battery pack, such as those used in Hybrid Q New commands allow reading of individual or all Electric Vehicles (HEVs). Each device also has a built in cell voltages, open wire connections and tempera- supply voltage regulator. ture sensors Q Option to measure cell voltages and perform open wire detection with or without the cell discharge CELLS CONNECTOR transistors conducting Q Functionality self test commands Q Thermal Shutdown built in and flagged Q Silicon revision code provided ISOLATED SPI PORT DC1393B DEMO FEATURES Q New Graphical User Interface (GUI) for demonstrat- MAIN SPI TOP SPI ing all new Rev C/D features INTERFACE ADDRESS PORT Q Optional isolated main SPI communication port CONNECTOR JUMPERS Q External discrete circuitry for daisy-chained current mode SPI communication up and down a stack of monitors Q LTC6802-2 ESD and fault protection circuitry added 1 DC1393B GETTING STARTED WITH ONE BOARD CONNECTED SINGLE BOARD CONNECTION TO PC AND GUI Step 1. Set jumpers on DC1393B to the default posi- tions indicated in Table 1. TABLE 1. JUMPER FUNCTIONS JUMPER FUNCTION DEFAULT 1 POSITION 0 POSITION POSITION Two Jumper Block to Select Voltage Labeled V on board. Sets bottom Labeled I on board. Sets Top and Bottom JP1 Voltage or Current Mode for Mode port for voltage mode SPI commu- ports for Current Mode SPI communication Bottom SPI Port nication. using external daisy-chain current source circuitry. SPI Daisy Chain Configura- 1, 1, 1, 1 For V Mode communication to all For SPI daisy-chain communication set all JP6,JP7,JP8,JP9 tion Jumpers: boards set all four jumpers to the 1 four jumpers to the 0 setting. This enables Top of Stack position. the top port on each board for current (TOS) (All Four Jumpers Must mode communication up the stack. For SPI daisy chain communication Setting be Moved Together) this setting is required for only the board at the top of a cell stack. Use these settings also for the bottom These settings connect the top board in a daisy chain stack which should daisy chain current source transis- be set to V mode (JP1) for the bottom port tors to the top cell at the top of the communication to a system controller. cell stack. Board Address Setting 0, 0, 0, 0 Logic 1 setting Logic 0 setting JP2,JP3,JP4,JP5 (0000 to 1111) (for address 0000) JP2 is MSB JP5 is LSB Step 2. Connect the DC590 Quick Eval USB cable to Step 4. Connect the cells to be monitored to the cells PC/Laptop USB port. Connect a ribbon cable from connector J1. This connector is in two pieces. The DC590 to the Main connector of DC1393B (H1). setscrew piece can be unplugged to make it easier to attach a wiring harness from a four to twelve Step 3. Before running the DC1393 GUI, a DC590 cell battery stack. The LTC6802-2 is intended to driver must be installed. To do this, install the measure from four to twelve individual cells with a Quick Eval Software. Quick Eval can be down- total stack voltage of 10V to 60V. loaded from: With fewer than 12 cells to be monitored, the bot-