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L9779WD-SPI bảng dữ liệu(PDF) 68 Page - STMicroelectronics

tên linh kiện L9779WD-SPI
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L9779WD-SPI bảng dữ liệu(HTML) 68 Page - STMicroelectronics

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Functional description
L9779WD-SPI
68/141
DocID027721 Rev 2
Stepper is controlled by the logic AND between PWM input pin and PWM SPI bit. Thus to
control it by PWM input, SPI PWM bit must be set first, and to do it by SPI PWM bit, PWM
input pin must be set first.
If the bit EN=1, the writing of bit PWM from 0 to 1 leads to the next step of the turn on
sequence. The writing of bit PWM to 0 left unchanged the MOS of the bridge that is ON. The
step is done only if the PWM bit goes from 0 to 1.
The order of the turn-on sequence is defined by the bit DIR.
The initial stepper position, after power-on, is the one with OUTA_HS, OUTB_LS ON in
Hbridge1 and with OUTD_HS, OUTC_LS ON in Hbridge2.
If configured as H-bridges the internal logic prohibits that the low-side and the high-side
switch of the same half-bridge will be switched on simultaneously.
In the below diagram the stepper motor operation is available.
Table 29. Configuration of the stepper motor
PWM
EN
DIR
H-bridge 1 Power on
H-bridge 2 Power on
X
0
X
None
None
11
1
OUTA_HS, OUTB_LS
OUTD_HS, OUTC_LS
1
1
1
OUTA_HS, OUTB_LS
OUTC_HS, OUTD_LS
1
1
1
OUTB_HS, OUTA_LS
OUTC_HS, OUTD_LS
1
1
1
OUTB_HS, OUTA_LS
OUTD_HS, OUTC_LS
11
0
OUTA_HS, OUTB_LS
OUTD_HS, OUTC_LS
1
1
0
OUTB_HS, OUTA_LS
OUTD_HS, OUTC_LS
1
1
0
OUTB_HS, OUTA_LS
OUTC_HS, OUTD_LS
1
1
0
OUTA_HS, OUTB_LS
OUTC_HS, OUTD_LS



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