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BQ2167B-XXX Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2167B-XXX Datasheet(HTML) 1 Page - Texas Instruments |
1 / 9 page Features ➤ Complete and compact lithium ion gas gauge and protection solution for three or four series cells ➤ Accurate measurement of available battery capacity ➤ Provides overvoltage, undervoltage, and overcurrent protection ➤ Designed for battery pack integration – Small size – Includes bq2050 and bq2058 ICs – On-board charge and discharge control FETs – Low operating current for minimal battery drain ➤ High side FET control ➤ Battery capacity available through single-wire serial port ➤ “L” version includes 5 push-button activated LEDs to display state-of-charge information General Description The bq2167 Power Gauge Module provides a complete and compact battery management solution for Li-Ion battery packs. Designed for battery pack integration, the bq2167 combines the bq2050 Power Gauge IC with the bq2058 Su- pervisor IC on a small printed circuit board. The board in- cludes all the necessary components to accurately monitor battery capacity and protect the cells from overvoltage, un- dervoltage, and overcurrent conditions. The board works with three or four Li-Ion series cells. The Power Gauge IC uses the on-board sense resistor to track charge and discharge activity of the battery pack. Critical battery information can be accessed through the serial communications port at DQ. The supervisor cir- cuit consists of the bq2058 and two FETs. The bq2058 controls the FETs to protect the batteries during charge/discharge cycles and short circuit conditions. The bq2167 provides contacts for the positive and negative terminals of each battery in the stack. Please refer to the bq2050 and bq2058 data sheets for the specifics on the operation of the power gauge and supervisor ICs. Unitrode configures the bq2167 based on the informa- tion requested in Table 1. The configuration defines the number of series cells, the nominal battery pack capac- ity, the self-discharge rate, the Li-Ion battery type (coke or graphite anode), and the threshold limits. Figure 1 shows how the module connects to the cells. The bq2167L includes five LEDs to display remaining capac- ity in 20% increments of the learned capacity. The LEDs are activated with the onboard push-button switch. A module development kit is also available for the bq2167. The bq2167B-KT or the bq2167LB-KT includes one configured module and the following: 1) An interface board that allows connection to the serial port of any AT-compatible computer. 2) Menu driven software to display charge/discharge activity and to allow user interface to the bq2050 from any standard DOS PC. Pin Descriptions POS Pack positive B1P BAT1P/Battery 1 positive input B1N BAT1N/Battery 1 negative input B2N BAT2N/Battery 2 negative input B3N BAT3N/Battery 3 negative input B4N BAT4N/Battery 4 negative input ITEST Overcurrent test input DQ Serial communications port NEG Pack negative 1 bq2167 5/99 B Li-Ion Power Gauge™ Module with Pack Supervisor |
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