AS1181 datasheet(37/92 Pages) AMSOSRAM

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AS1181

Functional description

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DS001139 • v3-00 • 2026-Apr-01

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Bit

Source

Severity

Interrupt

type

Description

over_temp

Critical

Level

Over temperature (temp. > 125deg)

Critical/safety interrupt. Indicates over temperature of the

device.

idrive_overvoltage

Info

Pulse

Overvoltage on any active channel

Information interrupt to indicate voltage on LNx pins. If set,

too high voltage on LNx is present. Information can be

used to lower VLED via digital feedback. E.g.: Read-out

AS1181 interrupt and lower DCDC output voltage

providing VLED to AS1181.

idrive_undervoltage

Info

Pulse

Undervoltage on any active channel

Information interrupt to indicate voltage on LNx pins. If set

a too low voltage on LNx is present. Information can be

used to lower VLED via digital feedback. E.g.: Read-out

AS1181 interrupt and increase DCDC output voltage

providing VLED to AS1181. Possible to force it externally

by decreasing VLED to its minimum AND having a too

high forward voltage of the LED.

trigger_rate_error

Critical

Pulse

Trigger rate error

The strobe rate monitor measures the applied strobe

signal frequency and compares it to the value stored in

TD_TRATE_MAX register (Address 0x1A34). If the

applied strobe signal is too fast, an interrupt is set to

inform the host. Note that the strobe rate monitor is not

available in direct PWM mode with 1 or 2 inputs.

ecc_error

Critical

Level

OTP ECC error

During power-on reset, the device checks the OTP block

for any ECC errors (for example, if a bit has flipped). If an

error is detected, the ecc_error interrupt is triggered.

idrive_ramp_error

Critical

Pulse

Channel Ramp-down error

Interrupt is set when a channel (LNx) current ramps down

before ramp-up has been completed.

illum_duration_error

Critical

Pulse

Illumination time error

The illumination time monitor is continuously sampling the

PWM ON time applied via both inputs and comparing the

result with the value programmed in “TD_ILLUM_MAX

longer than the value programmed the current sinks get

turned off and the respective interrupt flag is set.

AS1181 Datasheet(PDF) 37 Page - ams-OSRAM AG

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