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AN4440 データシート(PDF) 23 Page - STMicroelectronics

部品番号 AN4440
部品情報  RFFE HVDAC control
PDF  36 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4440 データシート(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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