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UM1693 bảng dữ liệu(PDF) 39 Page - STMicroelectronics

tên linh kiện UM1693
Giải thích chi tiết về linh kiện  M0-7 standard high-side drivers hardware design guide
PDF  196 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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UM1693 bảng dữ liệu(HTML) 39 Page - STMicroelectronics

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UM1693
Protection against battery transients
195
Figure 19. Internal structures involved during application of ISO 7637-2 pulse 1 in a monolithic
HSD and indication of pin voltages
Besides, since the device input may be driven independent from the microcontroller by a
separate HW, which is supplied directly from battery, it’s mandatory to decouple the signal
coming from the microcontroller to the one coming from the limp home circuitry, in order to
avoid any backward supply of one circuit versus the other one. The decoupling is ensured
by a signal diode, placed in series to the Limp Home path connected to the device input.
Dimensioning of the series resistors on I/O line
The resistor value should be calculated according to the maximum injected current to I/O pin
of the used microcontroller. That value can be assumed about 10 mA. So that, the resistors
value should be at least 15 k
Ω (150 V/10 mA):
Ri ≥ 15 kΩ



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