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Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 4 Family overview radio transceiver The radio transceivers of the family TRX433 and TRX868 are offered in several designs. Their difference is in the software and / or in hardware. At the moment, there are three versions A, B and C, which have the following differences: Version A Version B Version C Data interface RS232 any, transparent RS232 Configuration over RS232 Sleep, Wake up tasks Only the most important parameter, only possible by power up delay TX-RX 1 t DATA + tRADIO , see timing diagram Comprehensive command set, configurable during operation at any time No Yes Yes 6 t BIT-RADIO Jitter +- 1/8 t BIT-RADIO Comprehensive command set, configurable during operation at any time t DATA + tRADIO see timing diagram Error checking CRC16 None With / without CRC16 Retransmit after failure Until the data are acknowledged correctly by the receiver No No Buffer size TX 2 x 31 bytes Ring buffer, 61 bytes 2 Buffer size RX 1 x 31 bytes, ring buffer Ring buffer, 61 bytes 2 Data handshake RTS-CTS, XON-XOFF RTS-CTS The three versions cover the demands of different usage as follows: Version A is for simple usage instead of cable e.g. between computer and peripheral device where the dead time through the transmission path does not matter. Data are checked by the transceiver with regard to faults. If faults are detected, data are repeated until correct reception. This version only sends the data when the buffer is full or when no further data is on hold during the time of 3ms. Version A and Evalkit3 are ideal for testing the radio range. Version B is used when the maximal control over the radio channel is necessary or desired. There is absolutely no coding or error checking done. The signal which is placed on the transmittion side is released transparently with a minimal delay 1:1 by the receiver. The signal has therefore an optimal compatibility to any way of coding and radio modules of other producers. Version C with a transparent byte mode is used when a short reaction time and at the same time the simplest activation is desired. The byte-by-byte incoming data are sent over radio with a short delay so that the receiver can start with the serial data output just a few milliseconds after the transmission of the 1 st data byte. When the error checking is active, the receiver outputs only correctly transmitted data. Without the error checking there, the higher-rated application has to take care of that. 1 tBIT_RADIO : time period for 1 bit with the chosen RF data rate 2 When the RF data rate is adjusted high enough in proportion to the RS232 baud rate then there occurs a continued data flow without a break through the handshake
Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 5 Dimensions 0.5mm 24.5mm Pin description 40.0mm TRX433-10 TRX868-10 front view 14 13 12 11 10 9 8 7 6 2 1 2.54mm 10.16mm 2.54mm Lead frame: pins 0.5 x 0.2mm Pin Name I/O Description Level Condition 4.5mm 1 RF I/O RF- in/out for lambda / 4 antenna (~ 50 Ω) 0 V DC-path to GND 2 GND RF Signal Ground 6 V_P O Programming voltage (do not connect) VCC 7 MCLR\ I Reset input, active low. 3 VCC Normal operation 8 RSSI O Received Signal Strength Indicator (analog out) 0 V -128 dBm 9 RTS O RTS handshake 0 V Ready to send 10 TxD O UART transmit data (digital out) VCC Stop bit or no data 11 RxD I UART receive data (digital in) VCC Stop bit or no data 12 CTS MODE WKUP I I I CTS handshake Interface mode (data or configuration) Sleep mode: Pin change terminates sleep 13 V+ Positive supply voltage 14 GND Ground 0 V 0 V Clear to send Data mode 3.5 to 6VDC 4 or 2.4 to 3.6VDC 5 3 connect an external reset controller, if supply voltage is not always within specified limits or if voltage ramp is slower than 50ms from 0V to 3.5V. 4 standard version with internal 3.3V supply voltage regulator (output logic high levels are limited to the internal 3.3V supply voltage) 5 version without internal voltage regulator (internal supply voltage = V+)
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