ST7FMC1K2TC STMICROELECTRONICS [STMicroelectronics], ST7FMC1K2TC Datasheet - Page 220
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ST7FMC1K2TC
Manufacturer Part Number
ST7FMC1K2TC
Description
8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, BRUSHLESS MOTOR CONTROL, FIVE TIMERS, SPI, LINSCI
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.ST7FMC1K2TC.pdf
(308 pages)
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ST7MC1/ST7MC2
MOTOR CONTROLLER (Cont’d)
DEAD TIME GENERATOR REGISTER (MDTG)
Read/Write (except bits 5:0 write once-only)
Reset Value: 1111 1111 (FFh)
Bit 7 = PCN: Number of PWM Channels .
0: Only PWM U signal is output to the PWM man-
1: The three PWM signals U, V and W are output
Bit 6 = DTE*: Dead Time Generator Enable
0: Disable the Dead Time generator
1: Enable the Dead Time generator and apply
* write once-only bit if PCN bit is set, read/write if
Table 74. DeadTime generator set-up
Note 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 56,
“Output configuration summary,” on page 209
220/308
PCN
DAC
ager for six-step mode motor control (e.g. PM
BLDC motors)
to the channel manager (e.g. for three-phase
sinewave generation)
complementary PWM signal to the adjacent
switch
PCN bit is reset. To clear the DTE bit if PCN=1,
it is mandatory to clear the PCN bit first.
7
0
0
0
0
1
1
1
1
DTE
in MDTG
PCN bit
register
0
0
1
1
0
0
1
1
DTG5 DTG4 DTG3 DTG2
in MDTG
register
DTE bit
0
1
1
0
0
1
1
0
Complementary PWM
applied to adjacent
WITHOUT deadtime
WITHOUT deadtime
NO Complementary
YES, but
YES, but
switch
PWM
YES
YES
YES
YES
NO
DTG1
DTG0
0
When the PCN bit is reset (e.g. for PM BLDC mo-
tors), 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), chan-
nels are paired and complementary PWM signals
can be output on the MCOx pins. This will follow
the rules detailed in Table 53, “Dead Time genera-
tor outputs,” on page 196 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.
Caution 1: The PWM mode will be selected via
the 00[5:0] bits in the MPHST register, the OE[5:0]
bits in the MPAR register and the OS2 and OS0
bits in the MCRB register as shown in Table 62,
“PWM mode when SR=1,” on page 212.
Caution 2: When driving motors with three inde-
pendent pairs of complementary PWM signals
(PCN=1), disabling the deadtime generator
(DTE=0) causes the deadtime to be null: high and
low side signals are exactly complemented.
It is therefore recommended not to disable the
deadtime generator (it may damage the power
stage), unless deadtimes are inserted externally.
Bits 5:0 = DTG[5:0]* Dead time generator set-up.
These bits set-up the deadtime duration and reso-
lution. Refer to Table 52, “Dead time programming
and example,” on page 194 for details.
With
125ns to 16µs with steps of 125ns, 250ns and
500ns.
* Write-once bits; once write-accessed these bits
cannot be re-written unless the processor is reset
(See “Caution: Access to write-once bits” on
page 219.).
F
mtc
= 16MHz dead time values range from
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