STw4102

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Figure 25.

Byte write operation

10.2

Register mapping

The mapping of all registers is shown in Table 18. Individual register descriptions are shown

in Table 19 to Table 35. Power-up values are set at power startup, or at reset (RESETN pin

falling edge). Charge and discharge internal accumulators are not affected by RESETN.

Start bit = SDAfalling when SCL=1

Stop bit = SDArising when SCL=1

Restart bit = start after a start

Start Device id

Reg address

8bits

A

Reg data

8bits

A

7 bits

Stop

A

W

Table 18.

Register mapping

Name

Address

(dec.)

Description

REG_CHG0

0

Charge control and status

REG_CHG1

1

Charge enable

REG_WDOG

2

Watchdog control

REG_CG

3

Gas gauge control

REG_CHARGE_LOW

4

Gas gauge charge data, bits 0-7

REG_CHARGE_MID

5

Gas gauge charge data, bits 8-15

REG_CHARGE_HIGH

6

Gas gauge charge data, bits 16-23

REG_DISCHARGE_LOW

7

Gas gauge discharge data, bits 0-7

REG_DISCHARGE_MID

8

Gas gauge discharge data, bits 8-15

REG_DISCHARGE_HIGH

9

Gas gauge discharge data, bits 16-23

REG_CONVDATA_LOW

16

Gas gauge AD converter data, bits 0-7

REG_CONVDATA_HIGH

17

Gas gauge AD converter data, bits 8-12

REG_CONVNUMBER_LOW

18

Number of conversions, bits 0-7

REG_CONVNUMBER_HIGH

19

Number of conversions, bits 8-11

REG_ADCTRL

20

Battery voltage monitor control

REG_ADDATA_LOW

21

Battery voltage monitor AD converter data, bits 0-7

REG_ADDATA_HIGH

22

Battery voltage monitor AD converter data, bits 8-10