RFM70-D QUASAR, RFM70-D Datasheet - Page 7

• Manufacturer Part Number: RFM70-D
• Description: MODULE, TRANSCEIVER, DIP, 2.4GHZ
• Manufacturer: QUASAR

Specifications of RFM70-D

• Modulation Type: GFSK
• Data Rate Max: 2Mbps
• Frequency Range: 2.4GHz To 2.527GHz
• Sensitivity: -85dBm
• Supply Voltage Range: 1.9V To 3.6V
• Supply Current: 23mA
• Interface Type: SPI
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4.2
In power down mode RFM70 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
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
consumption while maintaining short start-up
time. In this mode, part of the crystal oscillator
is active. This is also the mode which the
RFM70 returns to from TX or RX mode when
CE is set low.
used
Power Down Mode
Standby-I Mode
Tel: +86‐755‐86096587 Fax: +86‐755‐86096602 E‐mail: [e-mail]
to
minimize
RX
Figure 4 PRX (PRIM_RX=1) state control diagram
CE=1
average
CE=0
current
PWR_UP=1
ACK packet transmitted
Packet received
Power Down
Standby-I
VDD>=1.9 V
NO_ACK=0
EN_AA=1
PWR_UP=0
4.4
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
automatically enter TX mode and the packet is
transmitted.
4.5
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
PRIM_RX bit set low, a payload in the TX
FIFO, and a high pulse on the CE for more
than 10µs.
PTX device (PRIM_RX=0)
Standby-II Mode
TX Mode
in
this mode,
CE=0
http://www.hoperf.com
TX
RFM70
the
device
set
V1.0
high,
will
7