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ST7538Q Datasheet(PDF) 19 Page - STMicroelectronics

Part # ST7538Q
Description  FSK power line transceiver
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7538Q Datasheet(HTML) 19 Page - STMicroelectronics

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ST7538Q
Functional description
19/44
The UART interface allows to connect an UART compatible device instead SPI interface
allows to connect an SPI compatible device. The allowed combinations of Host
Interface/ST7538Q Mains Access are:
Figure 3.
Synchronous and asynchronous ST7538Q/Host controller interfaces
ST7538Q allows to interface the Host Controller using a five line interface (RxD,TxD,RxTx,
CLR/T, & REG_DATA) in case of Synchronous mains access or using a 3 line interface
(RxD,TxD & RxTx) in Asynchronous mains access. Since Control Register is not accessible
in Asynchronous mode, in this case REG_DATA pin can be tied to GND.
Table 9. Host Interface / ST7538Q mains access combinations
Host Device
interface type
UART/SPI pin
Communication
mode
Mains access
Asynchronous
Synchronous
UART
“1”
Transmission
X
UART
“1”
Reception
X
X(1)
1.
Received Data more stable than in Asynchronous Mains Access
SPI
“0”
Transmission
X
SPI
“0”
Reception
X
RxD
CLR/T
REG_DATA
RxTx
ST7538Q
Host Controller
TxD
UART/Asynchronous
Data Interface
RxD
CLR/T
REG_DATA
RxTx
ST7538Q
Host Controller
TxD
SPI/Synchronous
Data Interface
D03IN1415



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