AS1181 datasheet(38/92 Pages) AMSOSRAM

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AS1181

Functional description

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DS001139 • v3-00 • 2026-Apr-01

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Interrupts 16-31 can be managed with the following registers:

•

IRQ_ENABLE1 register (Address 0x1A3A)

•

IRQ_STATUS1 register (Address 0x1AA6)

•

IRQ_HISTORY1 register (Address 0x1AAC)

•

IRQ_MASK1 register (Address 0x1AB2)

Table 7: Interrupt sources 16-31

Bit

Source

Severity

Interrupt

type

Description

osc_error

Critical

Pulse

Oscillator period error

Interrupt is set if the internal oscillator is stuck or frequency

is out of specification

watchdog_timeout

Critical

Pulse

Watchdog timeout error

Interrupt is set when the internal MCU gets stuck and runs

into timeout

rload_test_error

Critical

Pulse

Rload test failure (BIST)

The Rload test bypasses the external LEDs with an

internal RLOAD resistor and is calibrated at production

testing to provide a known relationship between voltage

across the internal Rload resistor and current sunk by LNx

current sources. Each LN current source can separately

be connected to the Rload circuit. The relationship

established at production test between the voltage across

Rload for a given current will be checked against the value

recorded in the OTP. The device temperature and the

temperature coefficient of the polysilicon resistor used will

also be taken into account. This interrupt is set when a

problem occurs during RLOAD test.

hs_overcurrent

Critical

Pulse/

level

HS switch overcurrent error (BIST & continuous

check)

Interrupt is set when high side (HS) overcurrent detector is

detecting a LED current higher than set thresholds.

curr_lim_hi_overrun

Critical

Level

Overcurrent error on any channel

Interrupt is set when HOST wants to accidentally program

a current higher than set CURR_LIM threshold. Register

CURR_LIM0 to CURR_LIM7

curr_lim_lo_underrun

Critical

Level

Undercurrent error on any channel

Interrupt is set when HOST wants to accidentally program

a current lower than set CURR_LIM threshold. Register

CURR_LIM0 to CURR_LIM7

supply_overvoltage

Critical

Level

Overvoltage error on VP18 or VLED

Interrupt is set when there is an overvoltage error on VP18

or VLED.

Thresholds:

VLED OV 5.3 - 5.5V

VP18 OV 1.88V

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