AS3543 datasheet(48/92 Pages) AMSCO

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AS3543 3v2

Data Sheet - D e t a i l e d D e s c r i p t i o n - S Y S T E M F u n c t i o n s

STATUS CHANGE

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

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

10.4.3 De-bouncer

There is a de-bounce 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/8ms can be selected by 2 bits in the

IRQ_ENRD_4 register (27h).

10.4.4 Interrupt Sources

26 IRQ events will activate the XIRQ pin:

Headphone connected

Headphone over-current

Microphone connected

Microphone remote control

Voice activation threshold reached

RTC sec/min elapsed

10bit ADC end of conversion

I²S changed (active/inactive)

USB changed (connect/disconnect)

Charger changed (end of charge or connect/disconnect)

Battery temperature high (at 45ºC or 55ºC with 100k

Ω NTC)

Junction temperature high

RTC watchdog (e.g. after battery was changed)

Battery low (Brown-out voltage reached)

Wake-up from hibernation

Power-up key (pin PWRUP) pressed

Power rail monitor: over-voltage PVDD1, PVDD2, CVDD1, CVDD2, DCDC15

Power rail monitor: under-voltage PVDD1, PVDD2, CVDD1, CVDD2, AVDD27

10.4.5 Register Description

Table 35. Interrupt Related Register

Name

Base

Offset

Description

Out_Cntr3

2-wire serial

1A-3h

Control of XIRQ signal, polarity and drive

PMU_Enable

2-wire serial

1Ch

Enables writings to extended register 1Ah-3 and 1Ah-5

IRQENRD_0

2-wire serial

23h

Enable/disable PMU interrupts

IRQENRD_1

2-wire serial

24h

Enable/disable wake-up, voice and PMU interrupts

IRQENRD_2

2-wire serial

25h

Enable/disable charger, USB and supervisor interrupts

IRQENRD_3

2-wire serial

26h

Enable/disable junction temperature, headphone, microphone

and I2S interrupt

IRQENRD_4

2-wire serial

27h

Enable/disable PMU, RTC, ADC10 and microphone interrupt,

set VBUS and CHGIN debounce time

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