2. Read back register 0x03 - must return 0x20, otherwise L DCDC or I C (SCL or SDA) is broken
AS3642
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
1. Write 0x20 into register 0x03 ( Control register) [Enable assist light with default 72mA].
7 2
3. Write 0x00 into register 0x03 [Power off]
4. Read register 0x04 ( Fault register) - must return 0x00, otherwise the LED is open or shorted
See Table 14 to identify the different possible soldering errors:
Table 14. How-to identify errors
Error
SCL or SDA broken
L DCDC broken
Flash LED shorted
Flash LED open
Identified by
writing 0x20 to 0x03 and read back of register 0x03 does not return 0x20
writing 0x20 to 0x03 and read back of register 0x03 does not return 0x20 - see DCDC
Broken Coil Detection on page 11
register fault_led_short (see page 19) is set
register fault_ovp (see page 19) is set
Table 15. I C Programing Example - 500mA, 480ms flash pulse
Typical I 2 C programming example
A typical use case for the AS3642 is to generate a 480ms, 500mA flash pulse. The programming example is shown in
Table 15 :
2
Use password to unlock next I C write
Sequence
write 0xA1 to register 0x80h
write 0xFF to register 0x02h
write 0x3F to register 0x03h
C-Syntax
AMSWriteByte(0x80,0xA1);
AMSWriteByte(0x02,0xFF);
AMSWriteByte(0x03,0x3F);
Purpose/Action
2
Set 500mA mode
( current_mode (page 16) =11b)
and current (page 17) to 500mA
Set flash_timer (page 18) to 480ms and
mode (page 18) to flash
(which automatically fires the flash and stops
it after flash_timer expired)
- no further action required -
the AS3642 automatically returns to
shutdown mode
7. Alternative testing method: Instead of reading the internal registers, the current into the AS3642 can be
measured. During assist light mode, the supply current must increase by at least 60mA. If an error is
detected, the current source and the DCDC is automatically switched off - see Protection and Fault Detec-
tion Functions on page 11
www.austriamicrosystems.com/AS3642
1.2-2
23 - 26
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