AS3668 datasheet(39/59 Pages) AMSCO

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AS3668

Data Sheet - Detailed Description

Table 36. PWM Control Register

0x16 PWM Timing Register

Bit

Bit Name

Default

Access

Bit Description

7:4

pwm_dim_speed_up

0x08

R/W

These bits define the value of tr_CURR which is the dim speed when

dimming up and down the current sources. The dim speed is valid for all

current sources at the same time.

0000: immediate

0001: 0.12s

0010: 0.25s

0011: 0.38s

0100: 0.51s

0101: 0.77s

0110: 1.0s

0111: 1.6s

1000: 2.1s

1001: 2.6s

1010: 3.1s

1011: 4.2s

1100: 5.2s

1101: 6.2s

1110: 7.3s

1111: 8.3s

3:0

pwm_dim_speed_down

0x08

R/W

These bits define the value of tr_CURR which is the dim speed when

dimming up and down the current sources. The dim speed is valid for all

current sources at the same time.

0000: immediate

0001: 0.12s

0010: 0.25s

0011: 0.38s

0100: 0.51s

0101: 0.77s

0110: 1.0s

0111: 1.6s

1000: 2.1s

1001: 2.6s

1010: 3.1s

1011: 4.2s

1100: 5.2s

1101: 6.2s

1110: 7.3s

1111: 8.3s

Table 37. PWM Trigger Register

0x17 PWM Trigger Register

Bit

Bit Name

Default

Access

Bit Description

start_dim

R/W

This bit defines in PWM mode of the current sources if the outputs are

switched on/off directly or dimmed up/down using the timing of register

pwm_dim_speed_up.

0: direct on/off of current sources

1: logarithmic/linear - up/down dimming of current sources

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