AS1170 datasheet(20/53 Pages) OSRAM

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AS1170

Detailed description

Datasheet

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DS001083

• v2-00 • 2024-Feb-05

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7.5.1

Over temperature protection

The junction temperature of the AS1170 is continuously monitored. If the temperature exceeds

TOVTEMP, the DCDC is stopped, the current sinks are disabled (instantaneous) and the bit

fault_overtemp is set. The driver is automatically re-enabled10 once the junction temperature

drops below TOVTEMP-TOVTEMPHYST.

7.5.2

Flash timeout

If the flash is started a timeout timer is started in parallel. If the flash duration defined by the

STROBE input (strobe_on = 1 and strobe_type = 1) exceeds tFLASHTIMEOUT (adjustable by

and fault_timeout is set.

If the flash duration is defined by the timeout timer itself (strobe_on = 0, the register

fault_timeout is set after the flash has been finished.

7.5.3

Supply undervoltage protection

If the voltage on the pin VIN (=battery voltage) is or falls below VUVLO, the AS1170 is kept in

shutdown state and all registers are set to their default state.

7.5.4

Wakeup circuit - power off detection

In flash, assist light and indicator mode (register mode_setting=01, 10 or 11) and out_on=1, if

SCL is L for more than tTIMEOUT, shutdown mode is automatically entered. This feature

automatically detects a power-off of the controlling circuit driving SCL and SDA (VDD_I/F goes

to 0 V e.g. due to a low power condition of the driving circuit).

10 In constant voltage mode (const_v_mode=1) the DCDC will not be automatically re-enabled.

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