AS3642 datasheet(19/27 Pages) AMSCO

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AS3642

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

Table 7. Control Register

Addr: 3

Control Register

This register defines the operating mode and different protection

functions in I

2C interface

Bit

Bit Name

Default Access

Description

3:0

flash_timer

R/W

Define the duration of the flash timer

30ms

60ms

90ms

120ms

150ms default value

180ms

210ms

240ms

270ms

300ms

330ms

360ms

390ms

420ms

450ms

480ms

5:4

mode

R/W

AS3642 operating mode selection

Shutdown mode

Indicator light mode with ind_current

Assist light mode

2 with assist_current

Flash mode with duration flash_timer with

flash_current (if current_mode=00b or 10b) or current

(if current_mode=10b or 11b)

reserved

reserved - don’t use

external_strobe

0R/W

External strobe signal from pin LED_OUT

no external strobe

A flash pulse with current defined by flash_current (if

current_mode=00b or 10b) or current (if

current_mode=10b or 11b) register is triggered on a

rising edge on LED_OUT (e.g. due to an external

signal pulling it high). At the same time this register is

automatically cleared. After the flash pulse (duration

defined by flash_timer) the AS3642 returns to

shutdown mode.

Note: Setting this bit automatically sets mode (see

page 18)=11 (flash mode)

A ongoing flash started with external_strobe

can be stopped by writing ‘0’ to

external_strobe and ‘00’ to mode.

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