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BQ26220 Datasheet(PDF) 6 Page - Texas Instruments |
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BQ26220 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 19 page bq26220 SLUS521B − AUGUST 2002 − REVISED FEBRUARY 2004 6 www.ti.com FUNCTIONAL BLOCK DIAGRAM UDG−02050 RBI GPIO VCC SRP VSS SRN HDQ BAT Multiplexer Temperature Sensor Autocalibrating VFC Bandgap, Reference and Bias ADC RAM Temperature Compensated Precision Oscillator Timer System I/O and Control User Registers Flash ID TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME No. I/O DESCRIPTION BAT 5 I Battery voltage sense input. This pin is used for sensing and measuring the battery voltage. RBI 1 I Register backup input. The RBI input pin is used with a storage capacitor or external supply to provide backup potential to the internal RAM and registers while VCC is < V(POR). GPIO 8 I/O General-purpose input/output pin. GPIO is a general-purpose programmable input or output port whose state is controlled via the HDQ serial communications interface. HDQ 4 I/O Single-wire HDQ interface. HDQ is a single-wire serial communications interface port. This bidirectional input/output communicates the register information to the host. SRN 6 I Current sense input 2. The bq26220 interprets charge and discharge activity by monitoring and integrating the voltage drop, VSR, across pins SRP and SRN. The SRN input connects to the sense resistor and the negative terminal of the pack. VSRP < VSRN indicates discharge, and VSRP > VSRN indicates charge. SRP 7 I Current sense input 1. The bq26220 interprets charge and discharge activity by monitoring and integrating the voltage drop, VSR, across pins SRP and SRN. The SRP input connects to the sense resistor and the negative terminal of the battery. VSRP < VSRN indicates discharge, and VSRP > VSRN indicates charge. VCC 2 I Supply voltage VSS 3 − Ground |
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