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RFM73 Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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RFM73 Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
7 / 27 page Page 7 of 27 RFM73 V2.0 Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com Figure 4 PRX (PRIM_RX=1) state control diagram 4.2 Power Down Mode In power down mode RFM73 is in sleep mode with minimal current consumption. SPI interface is still active in this mode, and all register values are available by SPI. Power down mode is entered by setting the PWR_UP bit in the CONFIG register to low. 4.3 Standby-I Mode By setting the PWR_UP bit in the CONFIG register to 1 and de-asserting CE to 0, the device enters standby-I mode. Standby-I mode is used to minimize average current consumption while maintaining short start-up time. In this mode, part of the crystal oscillator is active. This is also the mode which the RFM73 returns to from TX or RX mode when CE is set low. 4.4 Standby-II Mode In standby-II mode more clock buffers are active than in standby-I mode and much more current is used. Standby-II occurs when CE is held high on a PTX device with empty TX FIFO. If a new packet is uploaded to the TX FIFO in this mode, the device will automatically enter TX mode and the packet is transmitted. 4.5 TX Mode PTX device (PRIM_RX=0) The TX mode is an active mode where the PTX device transmits a packet. To enter this mode from power down mode, the PTX device must have the PWR_UP bit set high, PRIM_RX bit set low, a payload in the TX FIFO, and a high pulse on the CE for more than 10µs. |
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