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L9945TR データシート(PDF) 28 Page - STMicroelectronics

部品番号 L9945TR
部品情報  Automotive fully configurable 8-channel High/Low side MOSFET pre-driver suitable for 12 V and 24 V systems
PDF  144 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9945TR データシート(HTML) 28 Page - STMicroelectronics

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5.5.1
H-Bridge driving modes
The H-Bridge must be controlled via the external NONx pins. Such inputs have different meanings while in H-
Bridge mode:
Table 16. NONx signals in H-bridge configuration
HB1
HB2
Signal description
NON1
NON5
NPWM – Negative asserted Pulse Width Modulation signal
NON2
NON6
DIR – Direction signal
NON3
NON7
HiZ – High Impedance (all FETs actively switched off, load floating)
NON4
NON8
Not used
Any attempt to control channels via SPI is ignored while H-Bridge mode is active.
In driving mode the H-bridge work according to the following table:
Table 17. Truth table
HiZ
DIR
NPWM
HBx_AFW
Q1
Q2
Q3
Q4
Load’s driving direction
0
0
0
X (1)
OFF
ON
ON
OFF
Reverse
0
0
1
0
OFF
OFF
ON
OFF
Freewheeling (reverse)
0
0
1
1
OFF
OFF
ON
ON
Active freewheeling (reverse)
0
1
0
X
ON
OFF
OFF
ON
Forward
0
1
1
0
OFF
OFF
OFF
ON
Freewheeling (forward)
0
1
1
1
OFF
OFF
ON
ON
Active freewheeling (forward)
1
X
X
X
OFF
OFF
OFF
OFF
High Impedance
1. X = don't care.
The freewheeling is performed on low side, as shown in Figure 15. Software brake mode can be performed by
setting the active freewheeling bit (HBx_AFW).
L9945
Functional description
DS12275 - Rev 10
page 28/144



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