AS1181 datasheet(25/92 Pages) AMSOSRAM

Part #	AS1181

Description	8-channel LED/VCSEL driver with enhanced safety features

PDF	92 Pages

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Manufacturer	AMSOSRAM [ams-OSRAM AG]

Direct Link	https://ams-osram.com/

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25 / 92 page

AS1181

Functional description

Datasheet • PUBLIC • Document Feedback

DS001139 • v3-00 • 2026-Apr-01

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7.1.5

Direct PWM mode (1 PWM input)

In direct PWM mode the illumination duration can be controlled by “STROBE1_PWM1” input

used as a direct PWM source. If enabled by the PWM_CTR register (Address 0x1A32) bit

“pwm_illum_enable” the “STROBE1_PWM1” signal on-time determines the illumination

duration. Additionally, “TD_ILLUM register (Address 0x1A00) shows sampled illumination

duration. Illumination is still triggered by the rising edge of “STROBE1_PWM1” signal, with

latency defined in CH_DLY register (Address 0x1A24) bit “TD_TRIGDLY”.

Figure 25: External PWM mode 1

Sampling is continuous and the illumination duration follows the on-time of the

“STROBE1_PWM1” signal with TD_TRIGDLY latency.

TD_ILLUM register (Address 0x1A00) is updated with newly sampled duration with latency of

the one PWM cycle.

AS1181 Datasheet(PDF) 25 Page - ams-OSRAM AG