L99PD08 datasheet(34/41 Pages) STMICROELECTRONICS

34 / 41 page

SPI

L99PD08

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Doc ID 15872 Rev 3

Output PWM duty cycle selection, one register per channel. Active only if PWM_EN signal is

set for dedicated output.

b7 … b1 - PWM duty cycle of this channel (256 levels, default value – 50% DC, 80H)

Note:

The values of the duty cycle and the Phase will be captured and executed with the end of

the write command. Be aware, that an unwanted PWM can be generated during this phase.

Output PWM phase shift selection, one register per channel. This feature will improve the

power net characteristic during PWM mode.

b7 … b3 - phase shift of this channel related to the length of 1 PWM period (5 bits - 32

levels).

Note:

The values of the duty cycle and the phase will be captured and executed with the end of the

write command. Be aware, that an unwanted PWM can be generated during this phase.

Table 38.

DUTY_CH 0 – DUTY_CH 7 Registers, hex10 – hex17 (RW-Type)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 39.

PHASE_CH 0 - PHASE_CH7 Registers, hex18 – hex1F (RW-Type)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default values:

PHASE_CH0

0x00h

(0/32)

PHASE_CH1

0x20h

(4/32)

PHASE_CH2

0x40h

(8/32)

PHASE_CH3

0x60h

(12/32)

PHASE_CH4

0x80h

(16/32)

PHASE_CH5

0xA0h

(20/32)

PHASE_CH6

0xC0h

(24/32)

PHASE_CH7

0xE0h

(28/32)

Table 40.

CHANNEL_FB Registers, hex2E (R-Type)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CH7

CH6

CH5

CH4

CH3

CH2

CH1

CH0

CHx 0

channel CH x is off

channel CH x is on

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