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AN4440 Datasheet(PDF) 27 Page - STMicroelectronics

Part # AN4440
Description  RFFE HVDAC control
PDF  36 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4440 Datasheet(HTML) 27 Page - STMicroelectronics

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DocID025913 Rev 1
27/36
AN4440
USID modification
36
•
Send a value to register 1
Figure 42. Test new USID
•
Check that the old USID is no longer valid
Figure 43. Check that old USID is no longer valid
5.2
Two HVDACs
5.2.1
Introduction
When two HVDACs are connected on the same RFFE bus, the first preoccupation is to
distinguish them. Initially both have the same USID: 0111b. The unique difference is the
SELSID pin. One HVDAC should be connected to GND and the other should be connected
to VCC. This differentiation allows reprogramming differently the USID of each one. Finally,
when the HVDACs have two different USIDs, it is possible to send commands
independently to one or the other.



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