Digitally Controlled

Fuel-Gauge Interface

16

______________________________________________________________________________________

MAX1660

REF

OCI

CS

C5

R6

R5

AGND

MAX1660

REF

ODI

AGND

C4

R3

R4

a) CHARGING CURRENTS

b) DISCHARGING CURRENTS

TO BATT-

GND

Figure 10. Overcurrent-Detection Networks

Table 6. WriteConfig( ) Bit Functions

Second of two bits controlling OCO output state. To ensure proper overcurrent

protection, OCLO should always remain cleared. See the

Overcurrent

Detection section.

0

0

OCLO

First of two bits controlling OCO output state. See the

Overcurrent Detection section.

0

1

OCHI

Second of two bits controlling the ODO output state. To ensure proper overcur-

rent protection, ODLO should always remain cleared. See the

Overcurrent

Detection section.

0

2

ODLO

First of two bits controlling the ODO output state. See the

Overcurrent Detection

section.

0

3

ODHI

the Compare-Interrupt Enable. Set this bit to enable the digital compare function.

Clear this bit to disable this function. See the

Digital Compare Function section.

0

4

COMPENABLE

Offset-Measurement Enable. Set this bit to disconnect CS from the external

circuitry and internally short it to AGND. Clear this bit to reconnect CS to the

external circuitry and resume normal operation. See the

Internal Offset

Measurement section.

0

5

OFFSETMEAS

Counter Selection. Selects which counter is multiplexed to COUNT. Set this bit

to select the charge counter. Clear this bit to select the discharge counter. See

the

Charge and Discharge Counters section.

0

6

SETCOUNT

Clear Interrupts. Write 1 to clear ODSTATUS, OCSTATUS, COMPSTATUS, and

DIRCHANGE.

—

7

CLRINT

Clear Counter. Write 1 to clear both CHGCOUNT and DISCOUNT.

—

8

CLRCOUNTER

Soft-Shutdown Enable. Set this bit to enable soft shutdown. Clear this bit to

resume normal operation. See the

Shutdown Modes section.

0

9

SOFTSHDN

Direction-Change Interrupt Enable. Set this bit to enable direction-change

interrupt generation. Clear this bit to disable this function. See the

Direction-

Change Detection Function section.

0

10

DIRINTENABLE

Unused

—

11

—

Unused

—

12

—

Unused

—

13

—

Unused

—

14

—

Unused

—

15

—

DESCRIPTION

POWER-ON

RESET STATE

BIT

POSITION

BIT NAME

*

Patent pending