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L9947 bảng dữ liệu(PDF) 7 Page - STMicroelectronics

tên linh kiện L9947
Giải thích chi tiết về linh kiện  QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER
PDF  13 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9947 bảng dữ liệu(HTML) 7 Page - STMicroelectronics

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SYSTEM STARTUP (figure 2)
It is not mandatory that VS is present before VCC.
With the presence of the VCC the internal logic
would be reseted and the system restarts under
control of the inputs. If CSN = 0 for more than
100
µs after the presence of VCC the standby
mode is activated. Standby is also activated when
the CSN and VCC would be high at the same
time. When CSN = 0 and VCC goes up, the device
is not controlled by the bus. The outputs remain in
tristate but the current consumption is larger than
100
µA. A high - low - signal at the CSN - wire is
mandatory to control the outputs. There is no un-
dervoltage detection level for the supply voltage
VS implemented. The VCC should be supplied
from the same voltage supply as the driver of the
D0 -D3 pins (eg.
µC).
Figure 2: System Startup Sequence
L9947
7/13



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