www.austriamicrosystems.com

Revision 0.7

12 - 42

with additional features

with photosensor

AS3636

Preliminary Datasheet, Confidential - D e ta i l e d D e s c r i p t i o n

Standby mode is entered upon following conditions and Xenon Control Register, LED Control Register, Control Regis-

ter and Interrupt Status Register

5 are reset to their default:

1. STDBY is set to 1

2. Any fault condition (TOF, CTF, BCF, OTPF, AFF or ILF)

3. No flash is triggered within one minute and WATCHDOG=1

By writing ‘1’ into register RESET, all registers can be reset to their default.

In active mode, if SCL = 0 for 35ms and an EEPROM write is not pending, all registers are reset to their default values

and shutdown mode is entered reducing current consumption to a minimum.

Autofocus (AF) LED on pin VLED operating modes

The AF LED can be enabled with the TORCH input or the AF register bit or gated by the STROBE input if AFSTROBE

is set. If AFSTROBE is used, the DCDC converter is always run at 5V

input signal (within µs). The AFSTROBE register bit has priority over AF signal or TORCH input.

If AF or AFSTROBE is used and WATCHDOG=1, the AF LED and DCDC boost converter is automatically disabled

after one minute. Any read or write access to any AS3636 register resets this watchdog timer.

Figure 7. Autofocus LED operating modes

If the AF LED on pin VLED is switched on (as shown in Figure 7, by setting the pin TORCH=H or with the register bit

AF and AFSTROBE) the current through the LED is defined by Max_LED_current (for TORCH=H) and

AF_LED_current (for AF and AFSTROBE); if PWM=1, then the AF_LED_current current is PWM modulated with a

duty cycle defined by AF_LED_PWM.

DCDC Boost Converter VOUTBOOST

VOUTBOOST is used for the IGBT driver and for the autofocus (AF) LED. Therefore it supports 5V constant voltage

output and a constant current mode (where the 5V voltage output has priority) as shown in Figure 8:

Figure 8. DCDC Boost converter operating modes

5. Interrupt Status Register is only reset if STDBY is set by the interface





















 













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