BTS6480SF datasheet(29/73 Pages) INFINEON

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SPOC - BTS6480SF

Automatic PWM Generator

Data Sheet

Rev. 1.0, 2010-04-12

Figure 8

Phase Shifts between Channels

7.5

Daisy Chain Operation with PWM Generator

The SPI of SPOC - BTS6480SF provides daisy chain capability. In this configuration several devices are activated

by the same CS signal MCS. This allows the usage of only one PWM clock input signal

PCLK. To avoid a

synchronous activation of channels of the different devices, device phase shift can be programmed at the register

PCR.DPSH

7.5.1

Activation of Several SPOC Devices with PWM Generation

For the usage of several SPOC devices in daisy chain configuration with automatic PWM generation the following

procedure is recommended:

•

Wake up the devices by setting the DCR.MUX

≠ 111

•

Set the PWM frequencies, duty cycles, phase shifts of all channels

•

Set the device phase shift for each SPOC device differently

•

Activate the automatic PWM generator of all devices by setting PCR.PST within one MCS-frame

•

Activate the channels via the SPI registers OUT.OUTn

With the next rising edge of the PWM clock signal

PWM the automatic PWM generation will start. Please see

Figure 9 for details.

Note: If the PWM generator is started during stand-by, the power-on wake up time

WU(PO) (5.3.14) has to be

considered as delay until the automatic PWM generation will start.

ChannelPhaseShift .emf

PCLK

PCR.PST

OUT0

OUT.OUT0

OUT1

OUT.OUT1

PCLK

PWM0

Ch. phase shift1

BTS6480SF Datasheet(PDF) 29 Page - Infineon Technologies AG

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