http : //www.wenshing.com.tw ; http://www.rf.net.tw trw - 925a data s heet p. 1 wenshing ?? trw - 925a rf module wireless low power transceiver rf module (ism band system) version history version date changes v1.01 oct.29 , 2007 1 st . edition v1.02 dec.28 , 2007 2 nd . edition v1.03 aug.27 , 2008 3 rd . edition
http : //www.wenshing.com.tw ; http://www.rf.net.tw trw - 925a data s heet p. 2 specification ? uhf wireless data transceiver ? 8 00 mhz ~ 9 28 mhz ism ? channel hopping up to 1800 hops/s ? 24 bit rx/tx fifo ? hi s ensitivity: - 12 3 dbm ? wire and frame mode ? single 2. 5 v to 5 v supply ? up to 2w output power ? rs - 232 (uart) compatible ? spi micro - controller interface ? application range multi - channel home automation standards wireless audio wireless networks reading home automation remote keyless entry transmit mode parameter specification unit condition min typ e max frequency rang e 8 0 0 9 28 mhz stand by current consumption 660 a transmit speed r ate 1.2 500 kbps lowest psk is 2.4kbps lowest f sk is 1.2kbps output power 10 mw the l argest w orking c urrent 47.5 ma 868mhz: +10dbm receive mode parameter specification unit condition min typ e max frequency range 8 0 0 9 28 mhz stand by current consumption 660 a 12.5khz channel
http : //www.wenshing.com.tw ; http://www.rf.net.tw trw - 925a data s heet p. 3 transmit speed r ate 1.2 500 k bps lowest psk is 2.4 k bps lowest f sk is 1.2 k bps sensitivity - 12 3 dbm the l argest w orking c urrent 33.5 m a 868mhz: 500kbit/s working t emperature - 10 - 70 storage temperature - 50 - 95 block diagram
http : //www.wenshing.com.tw ; http://www.rf.net.tw trw - 925a data s heet p. 4 view pin assignment pin function io description 1 gnd p main power electrode 2 ant ant antenna interface 3 gnd p main po wer electrode 4 2.5v p output 5 vss p main power electrode 6 vdd p main power anode 7 ped i power on/off (hi= open , lo= close ) 8 ck i clk 9 so o rf serial data output ( miso ) 10 si i rf serial data output ( mosi ) 11 nrz o direct d ata output ( option ) 12 irq o to indicate fifo is empty or full. 13 sel i lo option 14 e/d i rf control (hi= work , lo= un - work )
http : //www.wenshing.com.tw ; http://www.rf.net.tw trw - 925a data s heet p. 5 application circuit time request spi 8 data read / write waveform : spi 8 data read waveform : ( in the previous is the highest effective data) : spi 8 data write waveform : ( in the previous is the highest effective data):
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