______________________________________________________________________________________ 29

System Power Management

for Mobile Handset

Table 7. EVENT_A

Table 8. EVENT_B

Note: The EVENT registers hold information about events that have occurred in MAX8939. Events are triggered by a change in the

status registers, which contains the status of the monitored signals. When an EVENT bit is set in the event register the IRQ signal

shall be asserted (unless the IRQ is to be masked by a bit in the IRQ mask register). The IRQ is also masked during the power-

up sequence and are not released until the event registers have been read for the first time. The event registers are automatically

cleared during read-out operation automatically. The event registers may be read-out in page mode. New events that occur during

read-out are delayed before they are passed to the event register, ensuring that the host controller does not miss them.

REGISTER NAME

EVENT_A

Register Pointer

0x03

Reset Value

0x00

Type

R/R&C

BIT

TYPE

NAME

DESCRIPTION

DEFAULT

0

R

CHG

Charger disabled caused IRQ

0

1

R&C

TIME_OUT

FAST_CHG or TOP_OFF timeout caused IRQ

0

2

R&C

WDOG_TIMEOUT

Watchdog timeout caused IRQ

0

3

R&C

TOP_OFF

Entering TOP_OFF (CV) caused IRQ

0

4

R

DONE

Fast-charging complete caused IRQ

0

5

R&C

RESTART

Fast-charging restarted caused IRQ

0

6

R&C

CHG_OVP_IN

Charger input overvoltage caused IRQ

0

7

R

TEMP_REG

Charger in thermal regulation caused IRQ

0

REGISTER NAME

EVENT_B

Register Pointer

0x04

Reset Value

0x00

Type

R/R&C

BIT

TYPE

NAME

DESCRIPTION

DEFAULT

0

R

LDO1_HWEN

Enable pin shift status caused IRQ

0

1

R&C

LED1_FAULT

Shorted or open circuitry caused IRQ

0

2

R&C

LED2_FAULT

Shorted or open circuitry caused IRQ

0

3

R

OVERTEMP

Overtemperature caused IRQ

0

4

R&C

RESET

RESET asserted

0

5

R&C

UVLO

Undervoltage lockout caused IRQ

0

6

R

CHG_DET

PWR_ON_CMP asserted by charger detection and caused

IRQ when UVLO upper

0

7

R&C

CHG_REM

Charger removal caused IRQ

0