DS2760

11

MEMORY MAP Table 3

Address (Hex)

Description

Read/Write

00

Protection Register

R/W

01

Status Register

R

02-06

Reserved

07

EEPROM Register

R/W

08

Special Feature Register

R/W

09-0B

Reserved

0C

Voltage Register MSb

R

0D

Voltage Register LSb

R

0E

Current Register MSB

R

0F

Current Register LSb

R

10

Accumulated Current Register MSB

R/W

11

Accumulated Current Register LSb

R/W

12-17

Reserved

18

Temperature Register MSB

R

19

Temperature Register LSb

R

1A-1F

Reserved

20-2F

EEPROM, block 0

R/W*

30-3F

EEPROM, block 1

R/W*

40-7F

Reserved

80-8F

SRAM

R/W

90-FF

Reserved

* Each EEPROM block is read/write until locked by the LOCK command, after which it is read-only.

PROTECTION REGISTER

The Protection Register consists of flags that indicate protection circuit status and switches that give

conditional control over the charging and discharging paths. Bits OV, UV, COC and DOC are set when

corresponding protection conditions occur and remain set until cleared by the host system. The default

values of the CE and DE bits of the Protection Register are stored in lockable EEPROM in the

corresponding bits in address 30h. A Recall Data command for EEPROM block 1 recalls the default

values of 1 into CE and DE. The format of the Protection Register is shown in Figure 9. The function of

each bit is described in detail in the following paragraphs.

PROTECTION REGISTER FORMAT Figure 9

Address 00

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

OV

UV

COC

DOC

CC

DC

CE

DE

OV – Overvoltage Flag. When set to 1, this bit indicates the battery pack has experienced an overvoltage

condition. This bit must be reset by the host system.

UV – Undervoltage Flag. When set to 1, this bit indicates the battery pack has experienced an

undervoltage condition. This bit must be reset by the host system.