ST7540 STMicroelectronics, ST7540 Datasheet - Page 21

• Manufacturer Part Number: ST7540
• Description: IC TXRX FSK POWER LINE 28-TSSOP
• Manufacturer: STMicroelectronics
• Type: Transceiverr

Specifications of ST7540

• 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
• Product: Modem Chip
• Data Rate: 4.8 KBd (Typ)
• Supply Voltage (max): 5.25 V or 13.5 V
• Supply Voltage (min): 4.75 V or 7.5 V
• Supply Current: 3.5 mA or 54 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• 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: Lead free / RoHS Compliant
• Other names: 497-5527-5

ST7540
●
Figure 7.
Figure 8.
REG_DATA
CLR/T
CLR_T
RxD
RxTx
RxD
TxD
Synchronous mode:
In Synchronous Mode ST7540 is always the master of the communication and provides
the clock reference on CLR/T line. When ST7540 is in receiving mode an internal PLL
recovers the clock reference. Data on RxD line are stable on CLR/T rising Edge.
When ST7540 is in transmitting mode the clock reference is internally generated and
TxD line is sampled on CLR/T rising Edge.
If RxTx line is set to “1” & REG_DATA=”0” (Data Reception), ST7540 enters in an Idle
State and CLR/T line is forced Low. After Tcc time the modem starts providing received
data on RxD line.
If RxTx line is set to “0” & REG_DATA=”0” (Data Transmission), ST7540 enters in an
Idle State and transmission circuitry is switched on. After Tcc time the modem starts
transmitting data present on TxD line
T
DS
T
Receiving and transmitting data/recovered clock timing
Data reception -> data transmission -> data reception
DH
Receiving Bit Synchronization
T
CR
T
CC
T
S
T
H
(Figure
D03IN1416
8) .
CLR/T
TxD
T
CR
Transmitting Bit Synchronization
T
CC
Functional description
T
S
T
T
H
B
D03IN1402
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