ST7540TR STMicroelectronics, ST7540TR Datasheet - Page 26

• Manufacturer Part Number: ST7540TR
• Description: IC TXRX FSK POWER LINE 28-TSSOP
• Manufacturer: STMicroelectronics
• Type: Transceiverr

Specifications of ST7540TR

• Number Of Drivers/receivers: 1/1
• Voltage - Supply: 5 V ~ 9 V
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP Exposed Pad, 28-eTSSOP, 28-HTSSOP
• For Use With: 497-5485 - BOARD EVAL ST7540 PWR LINE TXRX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 497-5528-2

Functional description
6.7
26/44
Figure 14. CD_PD Timing during RX
Figure 15. Receiving path block diagram
Transmission mode
The transmission mode is set when RxTx Pin =”0” and REG_DATA Pin =”0”. In transmitting
mode the FSK Modulator and the Power Line Interface are turned ON. The transmit Data
(TxD) enter synchronously or asynchronously to the FSK modulator.
●
●
In both conditions no Protocol Bits are added by ST7540.
The FSK frequencies are synthesized in the FSK modulator from a 16 MHz crystal oscillator
by direct digital synthesis technique. The frequencies Table in different Configuration is
reported in
Synchronous Mains access: on CLR/T rising edge, TxD Line Value is read and sent to
the FSK Modulator. ST7540 manages the Transmission timing according to the
BaudRate Selected
Asynchronous Mains access: TxD data enter directly to the FSK Modulator.The Host
Controller manages the Transmission timing
CD_PD
RxD (UART/SPI="1")
RxD (UART/SPI="0")
RX_IN
Table
8. The frequencies precision is same as external crystal one’s.
T
DCD
T
CD
demodulation active on RxD pin
T
DCD
noise demodulated
noise demodulated
T
CD
D03IN1418
ST7540