AS3515_08 datasheet(44/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.16 Interrupt Generation

6.16.1 General

All interrupt sources can get enabled or disabled by corresponding bits in the 3 IRQ-bytes. By default no IRQ source is enabled.

The IRQ output can get configured to be PUSH/PULL or OPEN_DRAIN and ACTIVE_HIGH or ACTIVE LOW with 2 bits in IRQ_ENRD2

6.16.2 IRQ Source Interpretation

There are 3 different modules to process interrupt sources:

LEVEL

The IRQ output is kept active as long as the interrupt source is present and this IRQ-Bit is enabled

EDGE

The IRQ gets active with a high going edge of this source. The IRQ stays active until the corresponding IRQ-Register gets read.

STATUS CHANGE

The IRQ gets active when the source-state changes. The change bit and the status can be read to notice which interrupt was the source.

The IRQ stays active until the corresponding interrupt register gets read.

6.16.3 De-bouncer

There is a de-bouncer function implemented for USB and CHARGER. Since these 2 signals can be unstable for the phase of plug-in or

unplug, a de-bounce time of 512ms/256ms/128ms/0ms can be selected by 2 bits in the IRQ_ENRD2 register (0x27h).

6.16.4 Register Description

First Interrupt Register (25h)

Table 44 IRQ_ENRD0 Register

Bit

Name

Int. Type

Description

CHG_tmphigh

Level

1: battery temperature was too high and the charger was turned off

CHG_endofch

Edge

1: charging is complete, turn charger off

After turning off the charger, IRQ will be released.

CHG_status

1: charger connected, also valid if charger is connected during wakeup

CHG_changed Status change 1: charger status changed, check CHG_status

USB_status

1: USB connected, also valid if USB is connected during wakeup

USB_changed

Status change 1: USB status changed, check UB_status

RVDD_waslow Level

1: if RTC supply was low, RTC not longer valid

IRQ will be released by any I2C action.

BVDD_islow

Level

1:BVDD has reached brown out level

The register is R/W; default value is 00h

By writing to the register the corresponding interrupt is enabled, reading the register delivers the interrupt source.

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