ST7MC1K2 datasheet(247/371 Pages) STMICROELECTRONICS

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The deadtime delay is the same for each of the channels and is programmable with the

DTG[5..0] bits in the MDTG register.

The resolution is variable and depends on the DTG5 and DTG4 bits. Table 110 summarizes

the set-up of the deadtime generator.

ITmtc is the period of the deadtime generator input clock (Fmtc = 16 MHz in most cases, not

affected by the XT16:XT8 prescaler bits in the MCONF register).

For safety reasons, and since the deadtime depends only on external component

characteristics (level-shifter delay, power components switching duration, etc.), the register

used to set-up deadtime duration can be written only once after the MCU reset. This

prevents a corrupted program counter modifying this system critical set-up, which may

cause excessive power dissipation or destructive shoot-through in the power stage half

bridges.

When using the three independent U, V and W PWM signals (PCN bit set) (see Figure 115)

to drive the MCOx outputs, deadtime is added as shown in Figure 112.

The deadtime generator is enabled/disabled using the DTE bit.

The effect of the DTE bit depends on the PCN bit value.

If the PCN bit is set:

●

DTE is read only. To reset it, first reset the PCN bit, then reset DTE and set PCN to 1

again.

●

If DTE = 0, the high and low side outputs are simply complemented (no deadtime

insertion, DTG[5:0] bits are not significant); this is to allow the use of an external

deadtime generator.

Note:

The reset value of the MDTG register is FFh so when configuring the deadtime, it is

mandatory to follow one the two following sequences:

To use deadtimes while the PCN bit is set; from reset state write the MDTG value at

once. The DTE bit is read back as 1 whatever the programming value (read only if

PCN = 1)

To use deadtimes while the PCN bit is reset, write first the deadtime value in DTG[5:0],

then reset the PCN bit, or do both actions at the same time.

Table 110.

Deadtime programming and example

DTG5 DTG4

Tdtg

Deadtime

expression

Deadtime

value

Tdtg

@16MHz fmtc

Deadtime

range

@ 16 MHz fmtc

2xTmtc (DTG[4..0]+1) x Tdtg

From 1 to 32 Tdtg

125ns

0.125µs to 4µs

4xTmtc

(DTG[3..0]+17) x Tdtg From 17 to 32 Tdtg

250ns

4.25µs to 8µs

8xTmtc

500ns

8.5µs to 16µs

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