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AN4440 bảng dữ liệu(PDF) 23 Page - STMicroelectronics

tên linh kiện AN4440
Giải thích chi tiết về linh kiện  RFFE HVDAC control
PDF  36 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN4440 bảng dữ liệu(HTML) 23 Page - STMicroelectronics

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AN4440
USID modification
36
5
USID modification
5.1
One HVDAC
5.1.1
Introduction
USID stands for Unique Slave Identifier. It is coded on 4 bits at the beginning of each RFFE
frame. Any HVDAC has a USID, by default 0111b, but can be reprogrammed. This is the
way to discriminate one slave from another and send instructions to the right device.
5.1.2
Sequence construction
USID reprogramming can be performed in 3 steps:
1.
Register 29 update
–
During this instruction, the USID, SELSID and product ID are checked and must
match the device
Figure 29. Register 29 update
2.
Register 30 update
–
During this instruction, the manufacturer ID is checked and must match the device
Figure 30. Register 30 update
3.
Register 31 update
–
During this instruction, the New USID is defined: here 0001b
Figure 31. Register 31 update



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