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ST7538Q Datasheet(PDF) 17 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) 17 Page - STMicroelectronics

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ST7538Q
Functional description
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5.4
ST7538Q mains access
ST7538Q can access the Mains in two different ways:
●
Synchronous access
●
Asynchronous access
The choice between the two types of access can be performed by means of Control
Register bit 14 (see Table 11) and affects the ST7538Q data flow in Transmission Mode as
in Reception Mode (for how to set the communication Mode, see Section 5.5 on page 18).
In Data Transmission Mode:
–
Synchronous Mains access: on clock signal provided by ST7538Q (CLR/T line)
rising edge, data transmission line (TxD line) value is read and sent to the FSK
Modulator. ST7538Q manages the Transmission timing according to the
BaudRate Selected.
–
Asynchronous Mains access: data transmission line (TxD line) value enters
directly to the FSK Modulator. The Host Controller manages the Transmission
timing (CLR/T line should be neglected).
Carrier
Frequency
(KHz)
Baud
Rate
Deviation
Exact
Frequency [Hz]
(Clock=16MHz)
Carrier
Frequen
cy
(KHz)
Baud
Rate
Deviation
Exact
Frequency [Hz]
(Clock=16MHz)
“1”
“0”
“1”
“0”
72
600
--
110
600
--
1
71777
72266
1
109701 110352
1200
0.5
71777
72266
1200
0.5
109701 110352
1
71452
72591
1
109375 110677
2400
0.5
71452
72591
2400
0.5
109375 110677
1
70801
73242
1
108724 111165
4800
0.5
70801
73242
4800
0.5
108724 111165
1
69661
74382
1
107585 112467
76
600
--
132.5
600
--
1
75684
76335
1
132161 132813
1200
0.5
75684
76335
1200
0.5
132161 132813
1
75358
76660
1
131836 133138
2400
0.5
75358
76660
2400
0.5
131836 133138
1
74870
77148
1
131348 133626
4800
0.5
74870
77148
4800
0.5
131348 133626
1
73568
78451
1
130046 134928
Table 7. ST7538Q synthesized frequencies



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