LP55231 datasheet(31/59 Pages) TI2

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00000000

10000000

11111111

PWM Bits

100

LP55231

www.ti.com

SNOSCR5D – MARCH 2013 – REVISED DECEMBER 2016

Product Folder Links: LP55231

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Figure 24. Direct PWM Control Bits vs PWM Duty Cycle

17 D2 PWM to 1E D9 PWM

•

PWM duty cycle control for outputs D2 to D9. The control registers and control bits for D2 output to D9 output

are similar to that given to D1.

26 D1 CURRENT CONTROL

•

D1 LED driver output current control register. The resolution is 8-bits and step size is 100 μA.

CURRENT BITS

OUTPUT CURRENT (mA, typical)

00000000

0.0

00000001

0.1

00000010

0.2

...

10101111

17.5 (default setting)

....

11111110

25.4

11111111

25.5

27 D2 CURRENT CONTROL to 2E D9 CURRENT CONTROL

•

The control registers and control bits for D2 output up to D9 output are similar to that given to D1 output.

36 MISC

•

This register contains miscellaneous control bits.

•

36 — Bit [7] VARIABLE_D_SEL

•

Variable D source selection.

•

1 = variable D source is the LED test ADC output (LED TEST ADC). This allows, for example, program

execution control with analog signal.

•

0 = variable D source is the register 3C (VARIABLE).

•

36 — Bit [6] EN_AUTO_INCR

•

The automatic increment feature of the serial bus address enables a quick memory write of successive

registers within one transmission.

•

1 = serial bus address automatic increment is enabled.

•

0 = serial bus address automatic increment is disabled.

•

36 — Bit [5] POWERSAVE_EN

•

1 = power save mode is enabled.

•

0 = power save mode is disabled. See Automatic Power-Save Mode for further details.

•

36 — Bits [4:3] CP_MODE

•

Charge pump operation mode.

•

00 = OFF.

•

01 = forced to bypass mode (1x).

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