ST7MC1K2 datasheet(251/371 Pages) STMICROELECTRONICS

251 / 371 page

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On-chip peripherals

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Programmable chopper

Depending on the application hardware (use of a pulse transformer, for example), a chopper

may be needed for the PWM signal. The MREF register allows the chopping frequency and

mode to be programmed.

The HFE[1:0] bits program the channels on which chopping is to be applied. The chopped

PWM signal may be needed for high side switches only, low side switches or both of them in

the same time (see Table 112).

The chopping frequency can be any of the eight values from 100 kHz to 2 MHz selected by

the HFRQ[2:0] bits in the MREF register (see Table 113).

Note:

When the PCN bit = 0:

- If complementary PWM signals are not applied (DTE bit = 0), the high and low drivers are

fixed by the MPAR register. Figure 109, Figure 115 and Figure 116 indicate where the

HFE[1:0] bits are taken into account depending on the PWM application.

- If complementary PWM signals are applied (DTE bit = 1), the channels are paired as

explained in Deadtime generator on page 245. This means that the high and low channels

are fixed and the HFE[1:0] bits indicate where to apply the chopper. Figure 117 shows

typical complementary PWM signals with high frequency chopping enabled on both high

and low drivers.

Table 112.

Chopping mode

HFE[1:0] bits

Chopping mode

HFE1

HFE0

PCN bit = 0

PCN bit = 1

OFF

Low channels only

Low side switches

MCO1, 3, 5

High channels only

High side switches

MCO0, 2, 4

Both low and high channels

Both high and low sides

Table 113.

Chopping frequency

HFRQ2

HFRQ1

HFRQ0

Chopping frequency

Fmtc =16MHz;

Fmtc =8MHz

Fmtc =4MHz

100 kHz

50 kHz

200 kHz

100 kHz

400 kHz

200 kHz

500 kHz

250 kHz

800 kHz

400 kHz

1 MHz

500 kHz

1.33 MHz

666.66 MHz

2 MHz

1 MHz

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