900MHz Wireless Modem RM900A 1.1 Summary Document Information RM900A is a high-tx power, high-sensitivity Info Content Author(s) Kong Juan Revision 1.0 Document Status First release Date Dec 11, 2015 Distribution Internal Use Only 868/915MHz IEEE 802.15.4 module, which offers a complete microcontroller/tran sceiver solution containing all hardware features necessary for development of wireless application. 1.
• Frequency Band 868-868.6MHz, 910-924MHz 11 channels • Power +3.3V ±0.3V from carrier board, 3.0V to 3.6V from battery pack • Interfaces 40-pin surface-mount 2x20 1.27mm pitch • RF 40kbps BPSK DSSS @915MHz 20kbps BPSK DSSS @868MHz • Dimensions 46.
Microcontroller Unit.
The module contains Atmel’s AT91SAM7X256 Microcontroller, AT86RF212B RF transceiver, balun, two RF switches, power amplifier and low noise amplifier. The balun transforms the differential radio transceiver RF signals (RFP/RFN) to a single ended RF signal. The RF switches separate between receive and transmit path. These switches are controlled by the RX/TX indicator. During receive the RF signal, switch will send it to the low noise amplifier.
Current Consumption: TX mode Current Consumption: Sleep mode 170 mA 600 uA TX: Mid 3.1.2 RF Characteristics Parameters Frequency Band Number of Channel Channel Spacing Transmitter Output Power Receiver Sensitivity On-Air Data Rate Range Unit 868-868.6/910-924 1/10 2 +20(max) -105 40(@915MHz) 20(@868MHz) Tx output/Rx input Nominal Impedence 3.
Pin Description Pin Description 1 DGND 2 DGND 3 nRESET 4 DGND 5 TXD1 6 TXD0 7 RXD1 8 RXD0 9 GPIO0 10 RTS/LED2 11 GPIO1 12 CTS/LED3 13 GPIO2 14 GPIO/LED4 15 GPIO3 16 GPIO/LED5 17 TEMP_E/GPIO4 18 GPIO/PS_CS 19 WakeUp/GPIO5 20 GPIO/PS_FRAME 21 BUZZER/GPIO6 22 +3.
Parameters Range Size Operation Temmperature Range Operation Relative Humidity Range 46×26×7 -40 to +55 Unit Condition mm ℃ No more than 80% 3.4 Antenna Reference • Suggest antenna:868MHz/910~924MHz antenna • MMCX connector on board, need a RF cable to antenna, such as MMCX to SMA RF cable. • Reserved UFL connector on board. 3.
Caution: This device complies with Part 15 of the FCC Rules / Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence.
brouillage radioélectrique à l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente (p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante. MPE Reminding To satisfy FCC / IC RF exposure requirements, a separation distance of 20 cm or more should be maintained between the antenna of this device and persons during device operation.
