ST7538Q STMicroelectronics, ST7538Q Datasheet - Page 26

• Manufacturer Part Number: ST7538Q
• Description: IC TXRX FSK POWER LINE 44-TQFP
• Manufacturer: STMicroelectronics
• Type: Transceiverr

Specifications of ST7538Q

• Number Of Drivers/receivers: 1/1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP Exposed Pad, 44-eTQFP, 44-HTQFP, 44-VQFP
• For Use With: 497-5484 - BOARD EVAL ST7538 PWR LINE TXRX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Other names: 497-5525

Functional description
5.8
26/44
Transmission mode
The transmit 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 ST7538Q.
The FSK frequencies are synthesized in the FSK modulator from a 16MHz crystal oscillator
by direct digital synthesis technique. The frequencies Table in different Configuration is
reported in
In the analog domain, the signal is filtered in order to reduce the output signal spectrum and
to reduce the harmonic distortion. The transition between a symbol and the following is done
at the end of the on-going half FSK sinewave cycle.
Figure 13. Transmitting path block diagram
ZCOUT
CLR/T
TOUT
TxD
Host Controller Synchronous Communication Mode: on CLR/T rising edge, TXD Line
Value is read and sent to the FSK Modulator. ST7538Q Manages the Transmission
timing according to the BaudRate Selected
Host Controller Asynchronous Communication Mode: TXD data enter directly to the
FSK Modulator.The Host Controller Manages the Transmission timing
7
5
8
15
Table
D-TYPE
FLOP
FLIP
Bit 14
7. The frequencies precision is same as external crystal one’s.
CLR/T GENERATOR
MODULATOR
Bit 7 & 8
Bit 0-5
FSK
DAC
THERMAL
SENSOR
TIMER
ZERO CROSSING
TRANSMISSION
Band Pass
ZCIN
FILTER
Bit 0-2
16
ALC
Bits 17 & 21
CURRENT
VOLTAGE
LOOP
LOOP
PLI
PLI
D03IN1420
29
23
19
21
24
ST7538Q
Vsense
CL
ATOP1
ATOP2
ATO