USER MANUAL
MOTION S.P.A.
sede amm.va e stabilimento:
Via Navicella 26 - Forlì (Italia)
Tel. 0039 0543 782668 fax 0039 0543 783082
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sede legale:
via Biondini, 27 47100 Forlì
P.IVA: IT 02602600401
in a vac
ant slot in the RX FIFOs. If the RX FIFOs are full, the received packet is discarded.
The n remains in RX mode until the MCU configures it to standby-I mode or power down mode.
However, if the automatic protocol features (Enhanced ShockBurst™) in the baseband protocol engine are
enabled, the n can enter other modes in order to execute the protocol.
Tx Mode
The TX mode is an ctive mode for transmitting packets.
The n stays in TX mode until it finishes transmitting a packet. The status of the TX FIFO determines the next
action. If the TX FIFO is not empty the n remains in TX mode and transmits the next packet.
If the TX FIFO is empty the n goes into standby-II mode. The n transmitter PLL operates in open
loop when in TX mode. It is important never to keep the n in TX mode for more than 4ms at a time. If the
Enhanced ShockBurst™ features are enabled, n is never in TX mode longer than 4ms.
Air data rate:
The air data rate is the modulated signaling rate the n uses when transmitting and receiving
data. It can be 250kbps, 1Mbps or 2Mbps. Using lower air data rate gives better receiver sensitivity than
higher air data rate. But, high air data rate gives lower average current consumption and reduced probability
of on-air collisions.
The air data rate is set by the RF_DR bit in the RF_SETUP register. A transmitter and a receiver must be
programmed with the same air data rate to communicate with each other.
n is fully compatible with nRF24L01. For compatibility with nRF2401A, nRF2402, nRF24E1, and
nRF24E2 the air data rate must be set to 250kbps or 1Mbps.
RF channel frequency:
The RF channel frequency determines the center of the channel used by the n.
The channel occupies a bandwidth of less than 1MHz at 250kbps and 1Mbps and a bandwidth of less than 2MHz at
2Mbps. n can operate on frequencies from 2.400GHz to 2.525GHz.
For U.S. and Canada the allowed frequency range is 2.400-2.483 GHz.
More technical informations are available in the section “Limitation of the single-modular transmitter (for U.S.
and Canada)”.
The programming resolution of the RF channel frequency setting is 1MHz.
At 2Mbps the channel occupies a bandwidth wider than the resolution of the RF channel frequency setting.
To ensure non-overlapping channels in 2Mbps mode, the channel spacing must be 2MHz or more. At
1Mbps and 250kbps the channel bandwidth is the same or lower than the resolution of the RF frequency.
Transmitter and a receiver must be brogrammed with the same RF channel frequency to communicate with
each other.
