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BQ20851-V1P2 Datasheet(PDF) 2 Page - Texas Instruments |
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BQ20851-V1P2 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 53 page  bq20851-V1P2 SLUS575 − AUGUST 2003 www.ti.com 2 DESCRIPTION (CONTINUED) The bq20851−V1P2 uses an integrating converter with continuous sampling for the measurement of battery charge and discharge currents. Optimized for coulomb counting in portable applications, the self-calibrating integrating converter has a resolution better than 3-nVh and an offset measurement error of less than 1- µV (typical). For voltage and temperature reporting, the bq20851−V1P2 uses a 16-bit A-to-D converter. In conjunction with the bq29311, the onboard ADC also monitors individual cell voltages in a battery pack and allows the bq20851−V1P2 to generate the control signals necessary to implement the cell balancing and the required safety protection for Li-ion and Li-polymer battery chemistries. The bq20851−V1P2 supports the Smart Battery Data (SBData) commands and charge-control functions. It communicates data using the System Management Bus (SMBus) 2-wire protocol. The data available include the battery’s remaining capacity, temperature, voltage, current, and remaining run-time predictions. The bq20851−V1P2 provides LED drivers and a push-button input to depict remaining battery capacity from full to empty in 20%, 25%, or 33% increments with a 3-, 4-, or 5-segment display. The bq20851−V1P2 contains 512 bytes of internal data flash memory, which store configuration information. The information includes nominal capacity and voltage, self-discharge rate, rate compensation factors, and other programmable cell-modeling factors used to accurately adjust remaining capacity for use-conditions based on time, rate, and temperature. The bq20851−V1P2 also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from programmable near full to near empty levels. The bq29311 AFE protection IC provides power to the bq20851−V1P2 from a 3 or 4 series Li-ion cell stack, eliminating the need for an external regulator circuit. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 VIN TS LED5 LED4 LED3 SCLK N/C VDDD RBI SDATA VSSD SAFE N/C N/C SMBC SMBD DISP EVENT VSSD VSSD LED1 LED2 CLKOUT VSSA ROSC FILT VDDA VSSA VSSP SR1 SR2 MRST N/C N/C N/C N/C N/C N/C TSSOP PACKAGE (TOP VIEW) NC − No internal connection AVAILABLE OPTIONS TA PACKAGE 38-PIN TSSOP (DBT) −20 °C to 85°C bq20851DBT−V1P2(1) (1) The bq20851−V1P2 is available taped and reeled. Add an R suffix to the device type (e.g., bq20851DBTR−V1P2) to order tape and reel version. |
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