xicor, inc. 1994 C 1999 patents pending 9900-3016.1 11/8/99 cm 1 characteristics subject to change without notice XK3100 3 or 4 cell li-ion battery system development kit description the XK3100 is a development board that features the xicor x3100 lithium ion battery protection and monitor ic. for use in battery packs consisting of 3 or 4 lithium- ion battery cells, the x3100 provides: ? internal over-voltage, under-voltage, and over-current protection circuitry ? internal eeprom memory ? circuits for externally monitoring cell voltages and pack current, including a current sense ampli?er for higher resolution current measurements, ? an internal voltage regulator, and ? internal drive circuitry for switching external fet devices used to control cell charge, discharge, and cell voltage balancing. the XK3100 board provides the external devices needed to control the battery pack and adds a microcontroller. this microcontroller talks to the pc through a 2-wire interface. the microcontroller provides a mechanism for interrogating the x3100 status, monitoring the pack voltages and current and controlling protection settings. the board provides an interface for attaching microcontroller development tools. this will facilitate the development of more complete battery pack software. future revisions of the software and microcontroller ?rmware, may include: full smbus support, battery gas gauging, cell balancing, and history tracking. the XK3100 user interface consists of a graphical user interface program running on windows 95/98. this software provides a menu driven method of setting the programmable elements of the x3100, monitoring the status of the batteries and reading the on-chip eeprom. the XK3100 board and software will monitor and control all features of the x3100 device. feature benefit ? self contained development board (batteries not included) ? speed system development ? x3100 and microcontroller control ? maximum ?exibility to explore alternative implementations. ? evaluate algorithmic trade-offs for gas gauging and cell balancing functions ? external components provided ? minimize battery pack development issues ? pc connection and software ? simple interface to special x3100 functions ? smbus hardware connection ? speeds development of industry standard smart battery interface included in the XK3100 ? fully assembled and tested board, complete with microcontroller, fets, sense resistor and regulator cir- cuits. ? win95/98 compatible executable program providing the user interface to the hardware. ? cable from the pc parallel port to the XK3100 ? two samples of the x3100 ? users manual ? x3100 data sheet ? board schematics and layout information ? two application notes.
XK3100 2 xicor, inc. 1994 C 1999 patents pending preliminary revision 5.0 characteristics subject to change without notice system block diagram board description: safety/battery monitor: ? x3100v8 (one on-board, one additional sample) with the following features: ? selectable over-voltage, under-voltage, and over- current protection circuitry ? 4k bits eeprom memory ? analog mux, with output, to externally monitor cell voltages and pack current ? current sense ampli?er with x10, x25, x80, x160 selectable gain. ? 5v +/- 0.5% voltage regulator, ? automatic and manual control of charge/discharge fets ? manual control of cell voltage balancing fets. microcontroller: ? mitsubishi m37516m4 with the following features: ? memory - rom: 16 kilobytes. preprogrammed with board ?rmware. - ram: 512 bytes ? a-d converter: - successive approximation architecture. - 10-bit resolution, +/- 1 lsb. - eight analog channels available. - 12.5s typical conversion time for adc. ? timers: - four 8-bit and one 16-bit watchdog timer availa- ble. - all are multi-purpose: designer can choose from timer, event count, pulse output, or pulse period measurement mode. ? serial i/o: - spi port. -i 2 c port: ? low-power dissipation: - multiple speed modes possible to conserve bat- tery power. - less than 1ua in lowest power mode ? development tools readily available. emulator support: the XK3100 board provides a socket that accepts the mitsubishi development tools and a single switch that selects the on-board microcontroller or the emulation system. this facilitates the development of custom routines, such as smbus support, cell balancing or fuel gauging. interface between pc and development board ? parallel interface from pc to XK3100 board. converts to i 2 c on board to connect to the microcontroller. XK3100 development board pc parallel port microcontroller spi i/f smbus i/f buffers uc emulator socket development area cells 34 uc emu b- p- b+ p+ p+ p- x3100
XK3100 3 xicor, inc. 1994 C 1999 patents pending preliminary revision 5.0 characteristics subject to change without notice software description ? windows 95/98 based software provides: ? menu driven interface. ? full time display that shows battery information on a periodic basis. information shown includes voltage on each cell, rsense voltage (both directions), computed current, computed b+ voltage, tempera- ture, control and con?guration bits and pack status. there are 6 sampling rates from 1 second to 120 seconds and samples may be recorded in a ?le. this provides the ability to automatically monitor a test setup of battery performance over a long period of time. ? tabular selection of screens for setting the program- mable characteristics of the x3100. this includes setting over-voltage, under-voltage and over-current thresholds, selecting sleep and power down modes, direct control of the charge/discharge fets, direct control of the cell balancing fets, and specifying the gain of the cell current ampli?er. ? a tabular screen selection also allows the reading and writing of the eeprom array. graphical user interface the following diagram shows a sample screen from the XK3100 development kit.
XK3100 4 xicor, inc. 1994 C 1999 patents pending preliminary revision 5.0 characteristics subject to change without notice board diagram 100 w . vss vcs1 vcs2 ovt uvt oct vcell1 cb1 cb3 vcell4 vcell3 x3100 cb2 vcc rgp rgc rgo ovp/lmon uvp/ as0 as1 as2 ao s0 scl cs si gp i/o m37516 100 w 100 w 100 w 100 w 100 w 100 w 100 w q1 q2 q3 q4 0.01uf 0.01uf 0.01uf 0.01uf 50 w 50ma max kta1661 si4435dy si4435dy 1m w d 1 p+ p- host i/f d 3 d 2 a/d reference a/d input a/d input 10k w r t v t vcell2 r sense 3 or 4 li-ion cells ? discharge fet charge fet vcc v rgo input data cb4 ? in the case that 3 cells are used vcell4 must be tied to vss. b+ b- ocp 50m w 0.1uf 0.1uf 0.1uf q1-q4 = 2n7002 2 q5 q7
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