AS3661 datasheet(38/87 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

8.10.3 OUTPUT DIRECT/RATIOMETRIC MSB and LSB

A particular feature of the AS3661 is the ratiometric up/down dimming of the RGB-LEDs. In other words, the LED

driver PWM output will vary in a ratiometric manner. By a ratiometric approach the emitted color of an RGB–LED

remains the same regardless of the initial magnitudes of the R/G/B PWM outputs. For example, if the PWM output of

the red LED output is doubled, the output of green LED is doubled also.

Table 9. ENGINE CNTRL2 Register

ENGINE CNTRL2

Bit

Bit Name

Default

Access

Bit Description

5:4

ENGINE1_MODE

R/W

00: Disabled

01: Load program to SRAM, reset engine 1 PC

10: Run program as defined by ENGINE1_EXEC bits

11: Halts the engine

3:2

ENGINE2_MODE

R/W

00: Disabled

01: Load program to SRAM, reset engine 2 PC

10: Run program as defined by ENGINE2_EXEC bits

11: Halts the engine

1:0

ENGINE3_MODE

R/W

00: Disabled

01: Load program to SRAM, reset engine 3 PC

10: Run program as defined by ENGINE3_EXEC bits

11: Halts the engine

Table 10. OUTPUT DIRECT / RATIOMETRIC MSB Register

OUTPUT DIRECT/RATIOMETRIC MSB

Bit

Bit Name

Default

Access

Bit Description

LED9_RATIO_EN

R/W

0: Disables ratiometric dimming for LED9 output.

1: enables ratiometric dimming for LED9 output.

Table 11. OUTPUT DIRECT / RATIOMETRIC LSB Register

OUTPUT DIRECT/RATIOMETRIC LSB

Bit

Bit Name

Default

Access

Bit Description

LED8_RATIO_EN

R/W

0: Disables ratiometric dimming for LED8 output.

1: enables ratiometric dimming for LED9 output.

LED7_RATIO_EN

R/W

0: Disables ratiometric dimming for LED7 output.

1: enables ratiometric dimming for LED9 output.

LED6_RATIO_EN

R/W

0: Disables ratiometric dimming for LED6 output.

1: enables ratiometric dimming for LED9 output.

LED5_RATIO_EN

R/W

0: Disables ratiometric dimming for LED5 output.

1: enables ratiometric dimming for LED9 output.

LED4_RATIO_EN

R/W

0: Disables ratiometric dimming for LED4 output.

1: enables ratiometric dimming for LED9 output.

LED3_RATIO_EN

R/W

0: Disables ratiometric dimming for LED3 output.

1: enables ratiometric dimming for LED9 output.

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