AS3630 datasheet(36/72 Pages) AMSCO

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AS3630 – 36

8A Supercap Flash Driver

If the voltage on VDCDC reaches VVOUTMAX and the voltage across

the current source between VDCDC and LED_OUT is below

VFLASH_COMP an open LED is detected.

If an open or shorted LED is detected, bit fault_led is set. The

DCDCs and current sinks are disabled and the Supercap is

discharged by setting mode_setting=001b. In external torch

mode, the register txmask_torch_mode is reset.

Note: Short/open LED detection is disabled in PWM operating

mode (mode_setting=101b). The voltage on VDCDC will

nevertheless never exceed VVOUTMAX.

AS3630 DIE Overtemperature Detected - fault_overtemp

The junction temperature of the AS3630 is continuously

monitored. If the temperature exceeds TOVTEMP, the DCDCs are

stopped, the current sources are disabled (instantaneous) and

the bit fault_overtemp is set (but the operating mode

mode_setting is not changed). The driver is automatically

re-enabled once the junction temperature drops below

TOVTEMP-TOVTEMPHYST.

Note: If an overtemperature is detected in Supercap pre-charge,

transition or charge mode, charging is temporarily disabled

until the temperature drops, but the register bit fault_overtemp

is not set.

Timeout Fault - fault_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, see Figure 31) exceeds tFLASHTIMEOUT

(adjustable by register flash_timeout), the DCDCs are stopped

and the flash current source (on pin LED_OUT ) is disabled

(ramping down) and fault_timeout is set.

If the flash duration is defined by the timeout timer itself

(strobe_on = 0, see Figure 28), the register fault_timeout is not

set after the flash has been finished.

AS3630 will automatically select the operating mode according

to register mode_after_flash shown in Figure 26.

Supercap Short Detected - fault_sc_short

In all operating modes except shutdown (mode_setting not

000b or 001b) once VSUPERCAP is above 2.4V both internal

capacitors of the Supercap (VSUPERCAP-BAL and BAL-GND) are

monitored if they are shorted. If any of them is shorted10,

charging is stopped and the Supercap is discharged by setting

mode_setting=001b andfault_sc_short is set.

10. VSUPERCAP-BAL is compared with typ. 950mV, BAL-GND is compared with typ. 700mV.

AS3630 Datasheet(PDF) 36 Page - ams AG

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