LP5523 datasheet(28/56 Pages) TI1

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LP5523

SNVS550D – SEPTEMBER 2009 – REVISED MAY 2013

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04 OUTPUT ON/OFF CONTROL MSB

•

04 — Bit [0] D9_ON

–

1 = D9 output ON.

–

0 = D9 output OFF.

–

Note: Engine mapping overrides this control.

05 OUTPUT ON/OFF CONTROL MSB

•

05 — Bit [7] D8_ON

–

1 = D8 output ON.

–

0 = D8 output OFF.

–

Note: Engine mapping over rides this control.

•

05 — Bit [0] D1_ON to Bit [6] D7_ON

–

The options for D1 output to D7 output are the same as above — see the “05 — Bit [7]” section.

06 D1 CONTROL

•

This is the register used to assign the D1 output to the MASTER FADER group 1, 2, or 3, or none of them.

Also, this register sets the correction factor for the D1 output temperature compensation and selects between

linear and logarithmic PWM brightness adjustment. By using logarithmic PWM-scale the visual effect looks

like linear. When the logarithmic adjustment is enabled, the chip handles internal PWM values with 12-bit

resolution. This allows very fine-grained PWM control at low PWM duty cycles.

–

06 — Bit [7:6] MAPPING

–

00 = no master fader set, clears master fader set for D1. Default setting.

–

01 = MASTER FADER1 controls the D1 output.

–

10 = MASTER FADER2 controls the D1 output.

–

11 = MASTER FADER3 controls the D1 output.

–

The duty cycle on D1 output will be D1 PWM register value (address 16H) multiplied with the value in the

MASTER FADER register.

–

06 — Bit [5] LOG_EN

–

0 = linear adjustment.

–

1 = logarithmic adjustment.

–

This bit is effective for both the program execution engine control and direct PWM control.

–

06 — Bit [4:0] TEMP_COMP

–

The reference temperature is +25°C (i.e. the temperature at which the compensation has no effect) and

the correction factor (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.

TEMP_COMP bits

Correction factor [%]

00000

Not activated - default setting after reset.

11111

−1.5 1/°C

11110

−1.4 1/°C

...

10001

−0.1 1/°C

10000

0 1/°C

00001

+0.1 1/°C

...

01110

+1.4 1/°C

01111

+1.5 1/°C

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