AS1170

Register description

Datasheet

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8.6

Control register

Table 12: Control register

Addr: 6

Control register

Bit

Bit name

Default

Access

Bit description

1:0

mode_setting

00

R/W

Define the AS1170 operating mode.

Value

Description

00

Shutdown.

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 31.25 kHz defined by register

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

10

Assist light mode

Led current is defined by the 7LSB(2) bits of

led_current1 and led_current2.

11

Flash mode(3)

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.

3

out_on

0

R/W

Enables the output current sinks (pin LED_OUT1/2).

Value

Description

0

Outputs disabled.

1

Outputs enabled (out_on and mode_setting

are automatically cleared after a flash pulse).

4

auto_strobe

1

R/W

Enables the auto trigger of flash mode with strobe pin.

Value

Description

0

Single flash / Strobe mode.

1

In strobe mode, there is no need after flash

timeout, the mode_setting and out_on bits

are not cleared. A new pulse on STROBE pin

will retrigger the flash again. There is no

need to rewrite the CONTROL register with

I²C command.

(1) This register identifies the operating mode and includes an all on/off bit.

(2) The MSB bit of this register not used to protect the LED; therefore, the maximum assist light current = half the maximum flash

current.

(3) Default trigger is done via external pin "STROBE".