ST7MC1K2 datasheet(281/371 Pages) STMICROELECTRONICS

281 / 371 page

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Table 154.

MDTG register description

Bit

Name

Function

7PCN

Number of PWM channels

0: Only PWM U signal is output to the PWM manager for six-step mode motor

control (example, PM BLDC motors)

1: The three PWM signals U, V and W are output to the channel manager

(example, for three-phase sinewave generation)

6DTE

Deadtime generator enable(1)

0: Disable the deadtime generator

1: Enable the deadtime generator and apply complementary PWM signal to the

adjacent switch

Write once-only bit if PCN bit is set, read/write if PCN bit is reset. To clear the DTE bit if PCN = 1, it is

mandatory to clear the PCN bit first.

5:0 DTG[5:0]

Deadtime generator set-up(2)

These bits set-up the deadtime duration and resolution. Refer to Table 110 on

page 247 for details.

With Fmtc = 16 MHz, deadtime values range from 125ns to 16µs with steps of

125ns, 250ns and 500ns.

Write-once bits; once write-accessed these bits cannot be rewritten unless the processor is reset (see

“Caution: Access to write-once bits” on page 280).

Table 155.

Deadtime generator set-up(1)

This table is true on condition that the CKE bit is set (Peripheral clock enabled) and the MOE bit is set

(MCOx outputs enabled). See Table 127: Output configuration summary on page 267.

When the PCN bit is reset (example, for PM BLDC motors), in Direct Access mode

(DAC = 1), if the DTE bit is reset, PWM signals can be applied on the MCOx outputs but not

complementary PWM. Of course, logical levels can be also applied on the outputs.

If the DTE bit is set (PCN = 0 and DAC = 1), channels are paired and complementary PWM

signals can be output on the MCOx pins. This follows the instructions detailed in Table 111:

Deadtime generator outputs on page 249 as the channels are grouped in pairs.

In this case, the PWM application is selected by the OS0 bit in the MCRB register.

It is also possible to add a chopper on the PWM signal output using bits HFE[1:0] and

HFRQ[2:0] in the MREF register.

DAC

PCN bit in

MDTG register

DTE bit in

MDTG register

Complementary PWM

applied to adjacent switch

Yes

Yes, but WITHOUT deadtime

No Complementary PWM

Yes

Yes, but WITHOUT deadtime

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