STMPE812 datasheet(26/51 Pages) STMICROELECTRONICS

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PWM controller

STMPE812

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Doc ID 17732 Rev 3

PWM controller

The PWM allows the brightness control of a LED/motor driver.

The PWM uses base clock that is ½ of the OSC frequency (typically 600 kHz). The base

clock is divided by a programmable DIV[4:0], which scales it to 18.75-600 kHz. This clock

goes into PWM controller and outputs a signal that is pulse-width modulated (16 steps), with

a frequency 16 times smaller.

10.1

Table 9.

PWM function registers

PWM clock div register

PWM clock divider register

Address:

0x50

Type:

R/W

Reset:

0x00

Description:

PWM clock divider register.

Address

Bit

Type

Reset

Description

0x50

PWM_ClockDiv

R/W

0x00

PWM clock divider

0x51

PWM_Control_1

R/W

0x00

Master control of PWM channel 1

Output at port 0

7654

BurstLength [1:0]

DIV[4:0]

0000

[7:5] BurstLength[2:0]

Burst length of PWM output

‘000’ – 8 ms

‘001’ – 16 ms

‘010’ – 32 ms

‘011’ – 64 ms

‘100’ – 128 ms

‘101’ – 256 ms

‘110’ – 512 ms

‘111’ – 1024 ms

[4:0] Div[4:0]

PWM controller is based on 600 kHz clock divided by (Div[4:0] + 1).

Effectively, PWM clock is:

600 kKz (msx.)

600 kHz/32 = 18.75 kHz (min.)

Obsolete

Product(s)

- Obsolete

Product(s)

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