AS1163 datasheet(49/91 Pages) AMSOSRAM

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AS1163

Functional description

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6.11.4

Driver fault – LED short to VDD

Set STATUS.LOS_FLAG (bit 2) when there is an LED short event (see also LED open).

READLEDSTCHN register shows the detailed error status.

A fault can be detected while a driver is active and the PWM value is larger than the minimum

PWM value set in the OTP non-customer area). This behavior is related to parameter

LED_Pers.

This function is available while the device is in active mode and at least 1 full PWM frame after

active mode is entered. Also, after a READSTAT, READLEDSTCHN (which clear the flags) at

least 1 full PWM frame is needed to re-check the status.

The flag bit will be deleted, when the Status Register is requested by host and the

corresponding fault is no longer present.

Note: Default (minimal PWM) value is 512. At high quantity orders, other threshold values can

be programed by ams OSRAM.

Table 15: Min PWM values for SHORT detection

OTP bit1

OTP bit 0

OPEN/SHORT min. PWM threshold value

512

6.11.5

Driver fault – LED open

Set STATUS.LOS_FLAG (bit 2) when there is an LED open event (see also LED short).

READLEDSTCHN register shows the detailed error status.

A fault can be detected while a driver is active and the PWM value exceeds the minimum

PWM value set in the OTP non-customer area (. This behavior is related to parameter

LED_Pers.

This function is available while the device is in active mode and at least 1 full PWM frame after

active mode is entered.

The flag bit will be deleted, when the Status Register is requested by host and the

corresponding fault is no longer present.

Note: Default value is 512. At high quantity orders, other threshold values can be programed

by ams OSRAM.

AS1163 Datasheet(PDF) 49 Page - ams-OSRAM AG