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AS3643

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

Table 9. TXMask Register

Addr: 3

TXMask Register

This register defines the TXMask settings and coil peak current

Bit

Bit Name

Default Access

Description

1:0

ext_torch_on

00

R/W

Defines operating mode for input pin TXMASK/TORCH

00

pin has no effect

01

txmask-mode; during flash if TXMASK/TORCH=1, the

LED current is set to flash_txmask_current - (see

TXMASK on page 15)

10

external torch mode: if TXMASK/TORCH=1 and

mode_setting=00, the AS3643is set into external

torch mode (LED current is defined by the 7LSB

of led_current )

11

don’t use

3:2

coil_peak

10

R/W

00

01

10

11

7:4

flash_txmask_current

2

6h

R/W

Define the current on pin LED_OUT1/2 in flash mode if

ext_torch_on=01 and TXMASK/TORCH=1

0h

0mA

1h

82mA

2h

163mA

3h

245mA

4h

326mA

5h

408mA

6h

489mA - default

7h

571mA

8h

653mA

9h

734mA

Ah

816mA

Bh

897mA

Ch

979mA

Dh

1060mA

Eh

1142mA

Fh

1224mA

1. The MSB bit of this register not used to protect the LED; therefore the maximum current = half the maximum

flash current

2.