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1.5-4

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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 11. Flash Timer Register

Addr: 5

Flash Timer Register

This register identifies the flash timer and timeout settings

Bit

Bit Name

Default Access

Description

7:0

flash_timeout

23h

R/W

Define the duration of the flash timer and timeout timer

0h

2ms

1h

4ms

2h

6ms

...

...

23h

72ms - default

...

...

7F

256ms

80

264ms(now 8 ms LSB steps from here on)

1

81

272ms

82

280ms

...

...

FEh

1272ms

FFh

1280ms

1. Internal calculation for codes above 80h: flash timeout [ms] = (flash_timeout-127) * 8 + 256 [ms]

Table 12. Control Register

Addr: 6

Control Register

This register identifies the operating mode and includes an all on/off bit

Bit

Bit Name

Default Access

Description

1:0

mode_setting

00

R/W

Define the AS3643 operating mode

00

shutdown or external torch mode if

ext_torch_on (page 22)=10

01

indicator mode (or low current mode using PWM)

LED current is defined by the 6LSB bits of led_current

pwm modulated with 31.25kHz defined by register

inct_pwm (1/16...4/16)

10

assist light mode:

LED current is defined by the 7LSB

led_current

11

flash mode:

LED current is defined by led_current

(out_on and mode_setting are automatically cleared

after a flash pulse)

2

reserved

X

R

reserved - don’t use, always write 0

3

out_on

0R/W

Enables the output current sinks (pin LED_OUT1/2)

0

outputs disabled

1

outputs enabled

(out_on and mode_setting are automatically cleared

after a flash pulse)