AS3661 datasheet(46/87 Pages) AMSCO

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AS3661

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

8.10.6 LEDx PWM

This is the PWM duty cycle control for LED1 to LED9 output. The PWM registers are effective during direct control

operation. Direct PWM control is active after power up by default.

Note: Serial bus address auto increment is not supported for register addresses from 16 to 1E.

Note: If the temperature compensation is active, the maximum PWM duty cycle is 50% at +25°C. This is require d to

allow enough headroom for temperature compensation over the temperature range -40 °C to 90°C.

LED9_LOG_EN

R/W

This bit is effective for both, program execution engine and

direct PWM control.

0: linear adjustment.

1: logarithmic adjustment.

4:0

LED8_TEMP_COMP

0 0000

R/W

The reference temperature is +25°C (i.e. the temper ature at

which all slope settings have no effect) and the temperature

coefficient (slope) can be set in 0.1 1/°C steps to any value

between -1.5 1/°C and +1.5 1/°C, with a default to 0.0 1/°C

11111: -1.5 1/°C

11110: -1.4 1/°C

...

00000: temperature compensation not activated

...

01110: +1.4 1/°C

01111: +1.5 1/°C

Table 23. LED1 PWM Register

LED1 PWM

Bit

Bit Name

Default

Access

Bit Description

7:0

LED1_PWM

0000 0000

R/W

This register controls the duty cycle of LED1 PWM output.

0000 0000: 0% Duty Cycle

0000 0001: 0.3921% Duty Cycle

0000 0010: 0.7843% Duty Cycle

0000 0011: 1.1765% Duty Cycle

....

1111 1111: 100% Duty Cycle

Table 22. LED9 CONTROL Register

LED9 CONTROL

Bit

Bit Name

Default

Access

Bit Description

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