DocID025792 Rev 2

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STC3117

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7.2

Register map and description

7.2.1

Register map

The register space provides 31 control registers, 16 read/write RAM working registers

reserved for the gas gauge algorithm, and 48 OCV table registers. Mapping of all registers

is shown in Table 11. Detailed descriptions of registers 0 (REG_MODE) and 1 (REG_CTRL)

are shown in Table 12 and Table 13. 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 14 gives a detailed description of the internal OCV table registers.

Table 11. Register map

Name

Address

(decimal)

Type

POR

Soft

POR

Description

LSB

Control registers

0 to 30

REG_MODE

0

R/W

Mode register

REG_CTRL

1

R/W

Control and status register

REG_SOC (L-H)

2-3

R/W

Battery SOC (2 bytes)

1/512 %

REG_COUNTER (L-H)

4-5

R

0x00

0x00

Number of conversions

(2 bytes)

REG_CURRENT (L-H)

6-7

R

0x00

0x00

Battery current (2 bytes)

5.88

μV

REG_VOLTAGE (L-H)

8-9

R

0x00

0x00

Battery voltage (2 bytes)

2.2 mV

REG_TEMPERATURE

10

R

0x00

0x00

Temperature

1

° C

REG_AVG_CURRENT

(L-H)

11-12

R/W

0x00

0x00

Battery average current or

SOC change rate (2 bytes)

1.47

μV or

0.008789 C

REG_OCV (L-H)

13-14

R/W

0x00

0x00

OCV register (2 bytes)

0.55 mV

REG_CC_CNF (L-H)

15-16

R/W

395

395

Coulomb counter gas gauge

configuration (2 bytes)

REG_VM_CNF (L-H)

17-18

R/W

321

321

Voltage gas gauge algorithm

parameter(2 bytes)

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 current

monitoring (bits 6-0)

47.04

μV

REG_CMONIT_COUNT

22

R

0x78

0x78

Current monitoring counter

REG_CMONIT_MAX

23

R/W

0x78

0x78

Maximum counter value for

current monitoring

REG_ID

24

R

0x16

0x16

Part type ID = 16h

REG_CC_ADJ (L-H)

27-28

R

0x00

0x00

Coulomb counter adjustment

register (2 bytes)

1/512 %

REG_VM_ADJ (L-H)

29-30

R

0x00

0x00

Voltage mode adjustment

register (2 bytes)