STC3115

22/31

DocID023755 Rev 4

7.2

Register map

7.2.1

Register map

The register space provides 28 control registers, 1 read-only register for device ID, 16

read/write RAM working registers reserved for the gas gauge algorithm, and 16 OCV

adjustment registers. Mapping of all registers is shown in Table 12. Detailed descriptions of

registers 0 (REG_MODE) and 1 (REG_CTRL) are shown in Table 13 and Table 14. All

registers are reset to default values at power-on or reset, and the PORDET bit in register

REG_CTRL is used to indicate the occurrence of a power-on reset.

Table 12. Register map

Name

Address

(decimal)

Type

POR

Soft

POR

Description

LSB

Control registers

0 to 23

REG_MODE

0

R/W

Mode register

REG_CTRL

1

R/W

Control and status register

REG_SOC

2-3

R/W

Gas gauge relative SOC

1/512%

REG_COUNTER

4-5

R

0x00

0x00

Number of conversions

(2 bytes)

REG_CURRENT

6-7

R

0x00

0x00

Battery current value

(2 bytes)

5.88 µV

REG_VOLTAGE

8-9

R

0x00

0x00

Battery voltage value

(2 bytes)

2.2 mV

REG_TEMPERATURE

10

R

0x00

0x00

Temperature data

1 °C

REG_CC_ADJ_HIGH

11

R/W

0x00

0x00

Coulomb counter adjustment

factor

1/2%

REG_VM_ADJ_HIGH

12

R/W

0x00

0x00

Voltage mode adjustment

factor

REG_OCV

13-14

R/W

0x00

0x00

OCV register (2 bytes)

0.55 mV

REG_CC_CNF

15-16

R/W

395

395

Coulomb counter gas gauge

configuration

REG_VM_CNF

17-18

R/W

321

321

Voltage gas gauge algorithm

parameter

REG_ALARM_SOC

19

R/W

0x02

0x02

SOC alarm level

(default = 1%)

1/2%

REG_ALARM_VOLTAGE

20

R/W

0xAA

0xAA

Battery low voltage alarm

level (default is 3 V)

17.6 mV

REG_CURRENT_THRES

21

R/W

0x0A

0x0A

Current threshold for the

relaxation counter

47.04 µV

REG_RELAX_COUNT

22

R

0x78

0x78

Relaxation counter

REG_RELAX_MAX

23

R/W

0x78

0x78

Relaxation counter max

value

REG_ID

24

R

0x14

0x14

Part type ID = 14h