Battery monitoring functions

AN3064

6/15

Doc ID 16263 Rev 1

Figure 4.

Gas gauge block diagram

The A/D converter’s output is a signed value in two’s complement format. It is positive when

the battery is charging and negative when the battery is discharging. When a conversion

cycle is completed, the result is added to the charge accumulator and the 16-bit conversion

counter is incremented.

AD converter

12/14-bit

CG

GND

28-bit

accumulator

Charge

register

Current

register

register

Counter

16-bit counter

EOC

16

16

16

Control logic

cg_enable

cg_calibration

cg_clock

Control

registers

32768 Hz

16

28

28

cg_res

2

rd_req

cg_rst

Σ

AM00832