BK2425WD datasheet(8/30 Pages) ETC2

8 / 30 page

BK2425

Revision 1.0

Proprietary and Confidential

Page 8 of 30

The PTX device stays in TX mode until it

finishes transmitting the current packet. If CE

= 0 it returns to standby-I mode. If CE = 1, the

next action is determined by the status of the

TX FIFO. If the TX FIFO is not empty the

PTX device remains in TX mode, transmitting

the next packet. If the TX FIFO is empty the

PTX device goes into standby-II mode. It is

important to never stay in TX mode for more

than 4ms at one time.

If the auto retransmit is enabled (EN_AA=1)

and

auto

acknowledge

required

(NO_ACK=0), the PTX device will enter TX

mode from standby-I mode when ARD

elapsed and number of retried is less than

ARC.



PRX device (PRIM_RX=1)

The PRX device will enter TX mode from RX

mode only when EN_AA=1 and NO_ACK=0

in received packet to transmit acknowledge

packet with pending payload in TX FIFO.

4.6

RX Mode



PRX device (PRIM_RX=1)

The RX mode is an active mode where the

BK2425 radio is configured to be a receiver.

To enter this mode from standby-I mode, the

PRX device must have the PWR_UP bit set

high, PRIM_RX bit set high and the CE pin

set high. Or PRX device can enter this mode

from

mode

after

transmitting

acknowledge packet when EN_AA=1 and

NO_ACK=0 in received packet.

In this mode the receiver demodulates the

signals from the RF channel, constantly

presenting the demodulated data to the packet

processing engine. The packet processing

engine continuously searches for a valid

packet. If a valid packet is found (by a

matching address and a valid CRC) the

payload of the packet is presented in a vacant

slot in the RX FIFO. If the RX FIFO is full,

the received packet is discarded.

The PRX device remains in RX mode until the

MCU configures it to standby-I mode or

power down mode.

In RX mode a carrier detection (CD) signal is

available. The CD is set to high when a RF

signal

detected

inside

the

receiving

frequency channel. The internal CD signal is

filtered before presented to CD register. The

RF signal must be present for at least 128 µs

before the CD is set high.



PTX device (PRIM_RX=0)

The PTX device will enter RX mode from TX

mode only when EN_AA=1 and NO_ACK=0

to receive acknowledge packet.

5 Packet Processing

5.1

Packet Format

The packet format has a preamble, address, packet control, payload and CRC field.

Preamble1byte

Address3~5byte

PacketControl 9/0bit

Payload0~32byte

CRC2/1byte

PayloadLength6bit

PID2bit

NO_ACK1bit

Figure 5 Packet Format

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