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AN2009 Datasheet(PDF) 36 Page - STMicroelectronics

Part # AN2009
Description  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2009 Datasheet(HTML) 36 Page - STMicroelectronics

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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
Table 5. Step Configuration Registers
Step
Σ1
Σ2
Σ3
Σ4
Σ5
Σ6
Current direction
A to B
A to C
B to C
B to A
C to A
C to B
High side
T0
T0
T2
T2
T4
T4
Low side
T5
T1
T1
T3
T3
T5
OO<5-0> output bits
100001
000011
000110
001100
011000
110000
Measure done on terminal:
C
B
A
C
B
A
Connected to pin
MCIC
MCIB
MCIA
MCIC
MCIB
MCIA
IS<1:0> selection bits value
10
01
00
10
01
00
MPHST
10100001 01000011 00000110 10001100 01011000 00110000
Back EMF shape
Falling
Rising
Falling
Rising
Falling
Rising
CPB value for BEMF detection
(ZVD=0)
0
1
0
1
0
1
Voltage on measured point at the
start of demagnetization
0V
HV
0V
HV
0V
HV
Transition at end of
demagnetization
0V->BEMF
(rising)
HV-
>BEMF
(falling)
0V->BEMF
(rising)
HV-
>BEMF
(falling)
0V->BEMF
(rising)
HV->BEMF
(falling)
Hardware demagnetization
always
possible
not always
possible
always
possible
not always
possible
always
possible
not always
possible
HDM-HDM bit value
(Hard - Soft Demagnetization
Mask bits)
10
11
10
11
10
11
PWM side selection for acceler-
ating demagnetization
Low Side
High Side
Low Side
High Side
Low Side
High Side
Driver selection for accelerating
demagnetization
T5
T0
T1
T2
T3
T4
OS2 bit
0
1
0
1
0
1
MCRB
xx010001
xx111101 xx010001 xx111101 xx010001
xx111101



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