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1.2-2

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AS3642

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

Register Map

1. Before changing mode register to 01, write 0xA1 to register 0x80h (password protection).

2. Torch mode and assist light mode share the same operating mode and identical currents.

3. Before changing external_strobe register to 01, write 0xA1 to register 0x80h (password protection).

Table 8. Fault Register

Addr: 4

Fault Register

This register identifies all the different fault conditions and provide

information about the LED detection

Bit

Bit Name

Default Access

Description

4:0

reserved

0

R

reserved - don’t use

5

fault_overtemp

0R

see Overtemperature Protection on page 11

0No fault

1

Junction temperature limit has been exceeded

6

fault_led_short

0R

see LED Short Circuit Protection on page 11

0No fault

1

A shorted LED is detected (pin LED_OUT)

7

fault_ovp

0R

see DCDC Overvoltage Protection on page 11

0No fault

1

An overvoltage condition is detected (pin VOUT)

Table 9. Register Map

Register

Definition

Addr

Default

Content

Name

b7

b6

b5

b4

b3

b2

b1

b0

Design Info

0

13h

fixed_id

Version Control

1

XXh

reserved

version

Current Set

2

B4h

flash_current

assist_c

urrent

ind_current

freq_swi

tch_on

current_mode

current if current_mode=10 or 11

Control

3

04h

external

_strobe

reserve

d

mode

flash_timer

Fault

4

00h

fault_ov

p

fault_le

d_short

fault_ov

ertemp

reserved