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L9945 Datasheet(PDF) 41 Page - STMicroelectronics

No. de pieza L9945
Descripción Electrónicos  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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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9945 Datasheet(HTML) 41 Page - STMicroelectronics

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Figure 20. Daisy chain and parallel operation
single chain
two devises in one daisy chain
three devises in one daisy chain
shift register
shift register
SDI
uC
CLK
NCS1 NCS2 NCS3
IC C: L9945
IC B: L9945
IC A: L9945
NCS1
CLK
NCS1 CLK
NCS1
CLK
NCS1: low for 96 clocks CLK
writes into IC A-IC C
reads from IC A-IC C
IC D: L9945
NCS2 CLK
NCS2: low for 64 clocks CLK
writes into IC D -E
reads from IC D -E
IC E: L9945
NCS2
CLK
NCS3: low for 32
clocks CLK
writes into IC F
reads from IC F
SDO
IC F: L9945
NCS3
CLK
SDI
SDO
SDI
SDI
SDO
SDO
SDI
SDO
SDI
SDO
SDI
SDO
shift register
shift register
shift register
shift register
shift register
GAPG0102161614CFT
Figure 21. Data transfer in daisy chain operation
master SDI
NCS1
CLK
SDO device 3
SDI device 3
SDO device 2
SDI device 2
SDO device 1
SDI device 1
master SDO
GADG2802171135PS
5.9.4
SPI electrical characteristics signal and the timing diagram
This section contains the electrical characteristics of the SPI signal and the timing diagram.
Note:
Tj = Tj_op; VVPS_UV < VVPS < 60 V, all supplies are independent; 4.5 V < VDD5 < 5.5 V; 3.0 V < VIO < 5.5 V,
unless otherwise noted.
L9945
Functional description
DS12275 - Rev 10
page 41/144



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