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1.5-4

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AS3648

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

1

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)

2

81

272ms

82

280ms

...

...

FEh

1272ms

FFh

1280ms

1. At maximum output current the flash duration should be limited to 120ms (depending of VF of the LED, thermal

design and ambient temperature) to avoid overheating of the AS3648.

2. 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 AS3648 operating mode

00

shutdown or external torch mode if

ext_torch_on (page 23)=10

01

indicator mode (or low current mode using PWM)

LED current is defined by the 6LSB bits of

led_current1 and led_current2 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_current1 and led_current2

11

flash mode:

LED current is defined by led_current1 and

led_current2

(out_on and mode_setting are automatically cleared

after a flash pulse)

2

reserved

X

R

reserved - don’t use, always write 0