bq2023

SINGLEWIRE ADVANCED BATTERY MONITOR IC

FOR CELLULAR AND PDA APPLICATIONS

SLUS480B – MAY 2001

10

POST OFFICE BOX 655303

APPLICATION INFORMATION

functional description (continued)

current sense offset

The bq2023 automatically self-calibrates and compensates for current offset. The self-calibration is performed

once every hour.

gas gauge control registers

The host maintains the charge/discharge and self-discharge count registers (CCR, CTC, DCR, DTC, and SCR).

To facilitate this, the bq2023 provides the CLR register to clear an individual counter or register pair. The host

system clears a register by writing the corresponding register bit to 1. When the bq2023 completes the clear

action, the corresponding bit in the CLR register is automatically reset to 0. Clearing the DTC or CTC registers

also clears the corresponding STC or STD bit in the MODE register.

device temperature measurement

The bq2023 reports die temperature in units of

°K through register pair TEMPH-TEMPL. See the TMP register

description for more details.

register interface

Information exchange between the host system and the bq2023 is through the data register interface. See

Table 4. The register set consists of a 271-location address space of 8-bit bytes segmented into:

Table 4. bq2023 Memory Map

ADDRESS

NAME

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

0x010F

DCRH

Discharge-count register high byte

0x010E

DCRL

Discharge-count register low byte

0x010D

CCRH

Charge-count register high byte

0x010C

CCRL

Charge-count register low byte

0x010B

SCRH

Self-discharge count register high byte

0x010A

SCRL

Self-discharge count register low byte

0x0109

DTCH

Discharge-timer–counter register high byte

0x0108

DTCL

Discharge-timer-counter register low byte

0x0107

CTCH

Charge-timer-counter register high byte

0x0106

CTCL

Charge-timer-counter register low byte

0x0105

MODE/WOE

RSVD

SLEN

STC

STD

WOE2

WOE1

WOE0

RSVD

0x0104

CLR

RSVD

POR

STAT

CTC

DTC

SCR

CCR

DCR

0x0103

TEMPH

Temperature high byte

0x0102

TEMPL

Temperature low byte

0x0101

FED

RSVD

PAGE6

PAGE5

PAGE4

PAGE3

PAGE2

PAGE1

PAGE0

0x0100

Reserved

0x00E0-0x00FF

RAM

Page 7, 32 bytes of RAM

0x00C0-0x00DF

Flash

Page 6, 32 bytes of flash

0x00A0-0x00BF

Flash

Page 5, 32 bytes of flash

0x0080-0x009F

Flash

Page 4, 32 bytes of flash

0x0060-0x007F

Flash

Page 3, 32 bytes of flash

0x0040-0x005F

Flash

Page 2, 32 bytes of flash

0x0020-0x003F

Flash

Page 1, 32 bytes of flash

0x0000-0x001F

Flash

Page 0, 32 bytes of flash

Not Recommended for New Designs