PDF RFM70 Data sheet ( Hoja de datos )

Número de pieza	RFM70
Descripción	Low Power High Performance 2.4 GHz GFSK Transceiver Module
Fabricantes	Hoperf
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No Preview Available ! RFM70 V1.0 Low Power High Performance 2.4 GHz GFSK Transceiver Module Features 2400-2483.5 MHz ISM band operation Support 1 and 2 Mbps air data rate Programmable output power (-40dBm to 5dBm) Low power consumption Variable payload length from 1 to 32bytes Automatic packet processing 6 data pipes for 1:6 star networks 1.9V to 3.6V power supply 4-pin SPI interface with maximum 8 MHz clock rate DIP-8pin and SMD-8pin Package RFM70 Applications Wireless PC peripherals Wireless mice and keyboards Wireless gamepads Wireless audio VOIP and wireless headsets Block Diagram Remote controls Consumer electronics Home automation Toys Personal health and entertainment 1 Free Datasheet http://www.datasheet-pdf.com/ 1 page 3 Pin Information RFM70 V1.0 Figure 2 RFM70 pin assignments (top view) Name GND VDD CE CSN SCK MOSI MISO IRQ Pin Function Ground Power Digital Input Digital Input Digital Input Digital Input Digital Output Digital Output Description Ground (0 V) Power Supply (1.9 V to 3.6 V DC) Chip Enable Activates RX or TX mode SPI Chip Select, Active low SPI Clock SPI Slave Data Input SPI Slave Data Output with tri-state option Maskable interrupt pin, Active low Table 1 RFM70 pin functions Tel: +86‐755‐86096587 Fax: +86‐755‐86096602 E‐mail: [email protected] http://www.hoperf.com 5 Free Datasheet http://www.datasheet-pdf.com/ 5 Page RFM70 V1.0 IRQ to MCU. Two packet loss counters (ARC_CNT and PLOS_CNT) are incremented each time a packet is lost. The ARC_CNT counts the number of retransmissions for the current transaction. The PLOS_CNT counts the total number of retransmissions since the last channel change. ARC_CNT is reset by initiating a new transaction. PLOS_CNT is reset by writing to the RF_CH register. It is possible to use the information in the OBSERVE_TX register to make an overall assessment of the channel quality. The PTX device will retransmit if its RX FIFO is full but received ACK frame has payload. As an alternative for PTX device to auto retransmit it is possible to manually set the RFM70 to retransmit a packet a number of times. This is done by the REUSE_TX_PL command. When auto acknowledge is enabled, the PRX device will automatically check the NO_ACK field in received packet, and if NO_ACK=0, it will automatically send an acknowledge packet to PTX device. If EN_ACK_PAY is set, and the acknowledge packet can also include pending payload in TX FIFO. 6 Data and Control Interface 6.1 TX/RX FIFO The data FIFOs are used to store payload that is to be transmitted (TX FIFO) or payload that is received and ready to be clocked out (RX FIFO). The FIFO is accessible in both PTX mode and PRX mode. There are three levels 32 bytes FIFO for both TX and RX, supporting both acknowledge mode or no acknowledge mode with up to six pipes. TX three levels, 32 byte FIFO RX three levels, 32 byte FIFO Both FIFOs have a controller and are accessible through the SPI by using dedicated SPI commands. A TX FIFO in PRX can store payload for ACK packets to three different PTX devices. If the TX FIFO contains more than one payload to a pipe, payloads are handled using the first in first out principle. The TX FIFO in a PRX is blocked if all pending payloads are addressed to pipes where the link to the PTX is lost. In this case, the MCU can flush the TX FIFO by using the FLUSH_TX command. The RX FIFO in PRX may contain payload from up to three different PTX devices. . A TX FIFO in PTX can have up to three payloads stored. The TX FIFO can be written to by three commands, W_TX_PAYLOAD and W_TX_PAYLOAD_NO_ACK in PTX mode and W_ACK_PAYLOAD in PRX mode. All three commands give access to the TX_PLD register. The RX FIFO can be read by the command R_RX_PAYLOAD in both PTX and PRX mode. This command gives access to the RX_PLD register. The payload in TX FIFO in a PTX is NOT removed if the MAX_RT IRQ is asserted. In the FIFO_STATUS register it is possible to read if the TX and RX FIFO are full or empty. The TX_REUSE bit is also available in the FIFO_STATUS register. TX_REUSE is set by the SPI command REUSE_TX_PL, and is reset by the SPI command: W_TX_PAYLOAD or FLUSH TX. 6.2 Interrupt In RFM70 there is an active low interrupt (IRQ) pin, which is activated when TX_DS IRQ, RX_DR IRQ or MAX_RT IRQ are set high by the state machine in the STATUS register. The IRQ pin resets when MCU writes '1' to the IRQ source bit in the STATUS register. The IRQ mask in the CONFIG Tel: +86‐755‐86096587 Fax: +86‐755‐86096602 E‐mail: [email protected] http://www.hoperf.com 11 Free Datasheet http://www.datasheet-pdf.com/ 11 Page

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