APC250

APPCON Technologies APC250 APC250 20dBm ISM RF Transceiver Module Features „ „ „ „ „ „ „ „ „ V1.21 Application GFSK transceiver Module ISM frequency bands 19.2K bps data rate Multiple channels 20dBm Max. output power Baud rate configurable 256 bytes data buffer Standby current < 3uA Supply voltage 3.4~5.5V „ „ „ „ „ „ „ „ Home automation Security alarm Telemetry Automatic meter reading Contactless access Wireless data logger Remote motor control Wireless sensor network DESCRIPTION APC250 is a low-cost sub-1 GHz transceiver module designed for operations in the unlicensed ISM (Industrial Scientific Medical) and LPRD bands. GFSK (Frequency Shift Keying) modulation/demodulation, multi-channel operation, high bandwidth efficiency and anti-blocking performance make APC250 modules easy to realize the robust and reliable wireless link. The module can be configured to work in different channels with 200k Hz space. It adopts high efficient looped interleaving EDAC (Error Detection and correction) coding with coding gain up to 3dB which keeps in advance in EDAC and coding efficiency over normal FEC (Forward Error Correction). Because of its high reliability in correction, modules can filter error and fake information automatically and realize truly transparent wireless link, which makes APC250 very suitable in the rigid communication environment. APC250 integrates 256 bytes buffer. When th e buffer is empty, users can transfer 256 bytes data per time and even limitless data transfer can be achieved as long as RF data rate (RF module to RF module) is configured to be faster than UART data rate (MCU to RF module). The module provides standard UART/TTL interface for selection. Users can choose seven data rates and three parity checks which makeAPC250 possibly tailor-made for different applications. APC250 operates at 3.4~5.5V with extra low standby current which makes it suitable for battery powered-up applica -tions. Revision 1.20 Page 1 of 9 Mar 2010 APPCON Technologies APC250 PIN FUNCTIONS PIN Name Function Description 1 GND Ground Ground (0V) 2 VCC Power Power supply 3 / EN Input Enable pin (≦0.5): work mode; (≧2.0V): sleep mode 4 RXD Input UART input, TTL level 5 TXD Output UART output, TTL level 6 AUX Output Data In/Out indication 7 SET Input Data / Field strength pin 8 NC --- No connection 9 NC --- No connection Table 1 APC250 Pin Functions ELECTRICAL SPECIFICATIONS Symbol Parameter (condition) Min. Typ. Max. Units 5.5 V 85 °C % VCC Supply Voltage 3.4 Temp Operating temperature range -30 RH Operating relative humidity 10 90 410 440 860 875 905 925 Freq Frequency range FDEV Modulation deviation Mod Modulation type IDD_R IDD_T Current in receive mode ⑴ IDD_S Pout Revision 1.20 Current in transmit mode Current in sleep mode. Output power 25 36 MHz KHz GFSK @ 433Mhz 20 @ 868Mhz 20 @ 915Mhz 20 mA @ 433Mhz 100 @ 868Mhz 100 @ 915Mhz 100 @ 433Mhz 3 @ 868Mhz 3 @ 915Mhz 3 uA @ 433Mhz 20 @ 868Mhz 20 @ 915Mhz 20 Page 2 of 9 mA dBm Mar 2010 APPCON Technologies Sen. (2) APC250 Receive sensitivity @ 433Mhz -121 @ 868Mhz -115 @ 915Mhz -115 dBm DRFSK GFSK data rate 1.2 19.2 Kbps DRIN Interface data rate 1.2 57.6 Kbps TE Evoking time from Sleep to Normal 20 uS CHBW Channel spacing 200 kHz ZANT Antenna Impedance 50 Ohm Table 2 APC250 Electrical Specifications Notes: (1) Transmit current is tested at the Max. output power. (2) Sensitivity is measured at 1.2k bps data rate. ABSOLUTE MAXIMUM RATINGS Symbol Parameter Min. Max. Units VCC Supply Voltage -0.3 5.5 V VI Input voltage -0.3 VCC+0.3 V VO Output voltage -0.3 VCC+0.3 V TST Storage temperature -55 125 °C Table 3 APC250 Maximum Ratings SETTING PARAMETERS 1. Default Values Parameter Option Default Value MCU data rate 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6 9.6 Parity Check No check, Even parity, Odd parity No check 418 ~ 455MHz 433.92 860 ~ 875MHz 869 905 ~ 925MHz 915 GFSK data rate 1.2,2.4, 4.8, 9.6, 19.2 9.6 Output Power 0 ~ 7 levels 7 (20dBm) Frequency Unit Kbps MHz Kbps Table 4 APC250 Default Settings Revision 1.20 Page 3 of 9 Mar 2010 APPCON Technologies APC250 2. Parameter Setting Users can configure the parameters (frequency, data rate, output power, etc.) of RF modules by PC or MCU. ♦ BY PC. The interface of APC250 is UART/TTL. If connecting it to PC, users need to use a TTL-to-RS232 level converter to transform the different levels. APPCON Technologies also provides converter board for configuration. Firstly users need to connect converter board to PC by cable and openAPPCON RF software; then insert module into converter board. After that the status column of tool should display “Found Device”. Users then can read/write the module. APPCON RF Tool ♦ BY MCU. The module can work normally after powering on for 50ms (T1) or more. When configuring the module, users need to switch the module to sleep mode (EN pin is high or floating) and monitor AUX pin. When AUX pin is high (no Receive or Transmit), the module will enter sleep mode in which the module can be configured after 20us (T2). When command is input to RXD pin, the module will be evoked. No matter what status of UART interface, the module will use 9600 bps (data rate) and no parity check as default format to communicate. Revision 1.20 Page 4 of 9 Mar 2010 APPCON Technologies APC250 GND 3.3V – 5.5V Or floating High voltage VCC EN TXD RXD RXD TXD AUX GPIO option SET Figure 2: Connecting Diagram When a command is sent to the module through the RXD pin, the module will send back response information by TXD pin in 50ms or less (T3) after it verifies the command is correct. The module then will be reset and initialized automatically and work with new settings after 100ms (T4). If the input command is incorrect, the module will make no response but it will still be reset and initialized. Users can take this advantage to wake up modules in long-term sleep or reset the modules. Figure 3: Timing Sequence for Setting Parameters The commands of APC250 are HEX coding. The default configuring data rate is Revision 1.20 Page 5 of 9 Mar 2010 APPCON Technologies APC250 9600 bps and no parity check included. The command set include two commands: Read command and Write command. Read command: Response: 0xFF,0x56,0xAE, 0x35,0xA9,0x55,0xF0 0x24,0x24,0x24+Freq+DRFSK+POUT+DRIN+Parity Write command: 0xFF,0x56,0xAE,0x35,0xA9,0x55,0x90+Freq+DRIN+POUT+DRFSK+ Parity Response: 0x24,0x24,0x24+Freq+DRFSK+POUT+DRIN+Parity Parameter Unit Length (Byte) Explanation Freq. KHz 3 433920KHz = 0x06, 0x9F, 0x00 DRFSK Kbps 1 1, 2, 5,10, 20, 40 equals to 0x00,0x01,0x02,0x03,0x04,0x05 POUT dB 1 From 0 to 7 represents 0x00 to 0x07. One increment increases 3dBm. “0x07” equals to the Max. output power (10dBm). DRIN Kbps 1 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6 equals to 0x00,0x01,0x02,0x03,0x04,0x05,0x06 1 0x00: No parity; 0x01: Even parity; 0x02: Odd parity Parity Table 5 APC250 Parameter Coding E.g. If the user wants to set the module work at Freq (433.92MHz), DRFSK (10K bps), POUT (10 dBm), DRIN (9.6k bps), Parity (no parity), the command could be written as below: Write Command: 0xFF,0x56,0xAE,0x35,0xA9,0x55,0x90,0x06,0x9F,0x00,0x03, 0x07,0x03, 0x00 Response: 0x24,0x24,0x24,0x06,0x9F,0x00,0x03,0x07,0x03,0x00 When the SET pin is in logic high, the module will work in normal mode. If it is set to logic low, the module will not output data but present field strength. The format is fixed 0xff+0xff+0xff+field strength value (one byte). Revision 1.20 Page 6 of 9 Mar 2010 APPCON Technologies APC250 Figure 4: RSSI Value vs Input Power The sleep mode of APC250 is switched through software. In Receive or Transmit mode, the module only can enter into sleep mode after one Receive or Transmit is finished. Users can take full use of this character. In other word sleep mode can be set in advance by setting EN pin to logic high before one Receive or Transmit finishes because the module will detect EN pin automatically after one Receive or Transmit process ends. Users can inquiry the status of AUX pin to judge if data is received or sent successfully. Revision 1.20 Page 7 of 9 Mar 2010 APPCON Technologies APC250 MECHANICAL DATA Figure 5: Mechanical Dimension APPCON Technologies Co., Ltd reserves the right to make corrections, modifications, improvements and other changes to its products and services at any time APPCON Technologies and to discontinue any product or service without notice. Customers are expected to visit websites for getting newest product information before placing Add.: Room 1005,Zhongyangxigu Building, orders. Xinzhou,Futian district, Shenzhen, China 518000 Tel: 0086-755-33370185 These products are not designed for use in life support Fax.: 0086-755-33370186 appliances, devices or other products where Email: sz0755@yahoo.cn malfunction of these products might result in personal Web: injury. Customers using these products in such www.appcon.com.cn applications do so at their own risk and agree to fully indemnify APPCON Technologies for any damages resulting from improper use. Revision 1.20 Page 8 of 9 Mar 2010