GFSK Transceiver. BK2421 Datasheet

BK2421 Transceiver. Datasheet pdf. Equivalent

BK2421 Datasheet
Recommendation BK2421 Datasheet
Part BK2421
Description Low Power High Performance 2.4 GHz GFSK Transceiver
Feature BK2421; BK2421 Low Power High Performance 2.4 GHz GFSK Transceiver Features Pin Assignments  2400-2483..
Manufacture Beken
Datasheet
Download BK2421 Datasheet




Beken BK2421
BK2421
Low Power High Performance 2.4 GHz GFSK Transceiver
Features
Pin Assignments
2400-2483.5 MHz ISM band operation
Support 1 and 2 Mbps air data rate
Programmable output power
(-40dBm to 5dBm)
Low power consumption
Tolerate +/- 60ppm 16 MHz crystal
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
Compact 20-pin 4x4 mm QFN package
Applications
Wireless PC peripherals
Wireless mice and keyboards
Wireless gamepads
Wireless audio
VOIP and wireless headsets
Block Diagram
VSS CDVDD VDD
20 19 18
VSS IREF
17 16
CE 1
CSN 2
SCK 3
MOSI 4
MISO 5
BK2421
15 VDD
14 VSS
13 RFN
12 RFP
11 VDDPA
6 7 8 9 10
IRQ VDD VSS XTALP XTALN
Remote controls
Consumer electronics
Home automation
Toys
Personal health and entertainment
RFP
RFN
FM
Demodulator
Data Slicer
Integrated
TDD RF
Transceiver
Power
Management
FM Modulator
Gaussian
shaping
XTALP XTALN
Rx FIFO
Packet
Processing &
State Control
Tx FIFO
CSN
SCK
MOSI
MISO
IRQ
CE
Revision 2.0
Apr, 2010
Copyright © 2010
Beken Corporation
Page 1 of 25



Beken BK2421
Table of Contents
BK2421
1 General Description ................................................................................................................. 3
2 Abbreviations .......................................................................................................................... 4
3 Pin Information ....................................................................................................................... 5
4 State Control ........................................................................................................................... 6
4.1 State Control Diagram............................................................................................................... 6
4.2 Power Down Mode.................................................................................................................... 7
4.3 Standby-I Mode......................................................................................................................... 7
4.4 Standby-II Mode........................................................................................................................ 7
4.5 TX Mode ................................................................................................................................... 7
4.6 RX Mode ................................................................................................................................... 8
5 Packet Processing .................................................................................................................... 8
5.1 Packet Format............................................................................................................................ 8
5.1.1 Preamble........................................................................................................................... 9
5.1.2 Address............................................................................................................................. 9
5.1.3 Packet Control .................................................................................................................. 9
5.1.4 Payload ........................................................................................................................... 10
5.1.5 CRC................................................................................................................................ 10
5.2 Packet Handling ...................................................................................................................... 10
6 Data and Control Interface .................................................................................................... 11
6.1 TX/RX FIFO ........................................................................................................................... 11
6.2 Interrupt ................................................................................................................................... 11
6.3 SPI Interface ............................................................................................................................ 12
6.3.1 SPI Command ................................................................................................................ 12
6.3.2 SPI Timing ..................................................................................................................... 13
7 Register Map ......................................................................................................................... 15
7.1 Register Bank 0 ....................................................................................................................... 15
7.2 Register Bank 1 ....................................................................................................................... 20
8 Electrical Specifications ......................................................................................................... 21
9 Typical Application Schematic............................................................................................... 22
10 Package Information.............................................................................................................. 23
11 Order Information................................................................................................................. 24
12 Contact Information .............................................................................................................. 25
Revision 2.0
Proprietary and Confidential
Page 2 of 25



Beken BK2421
1 General Description
BK2421 is a GFSK transceiver operating in
the world wide ISM frequency band at 2400-
2483.5 MHz. Burst mode transmission and up
to 2Mbps air data rate make them suitable for
applications requiring ultra low power
consumption. The embedded packet
processing engines enable their full operation
with a very simple MCU as a radio system.
Auto re-transmission and auto acknowledge
give reliable link without any MCU
interference.
BK2421 operates in TDD mode, either as a
transmitter or as a receiver.
The RF channel frequency determines the
center of the channel used by BK2421. The
frequency is set by the RF_CH register in
register bank 0 according to the following
formula: F0= 2400 + RF_CH (MHz). The
BK2421
resolution of the RF channel frequency is
1MHz.
A transmitter and a receiver must be
programmed with the same RF channel
frequency to be able to communicate with
each other.
The output power of BK2421 is set by the
RF_PWR bits in the RF_SETUP register.
Demodulation is done with embedded data
slicer and bit recovery logic. The air data rate
can be programmed to 1Mbps or 2Mbps by
RF_DR register. A transmitter and a receiver
must be programmed with the same setting.
In the following chapters, all registers are in
register bank 0 except with explicit claim.
RFP
RFN
FM
Demodulator
Data Slicer
Integrated
TDD RF
Transceiver
Power
Management
FM Modulator
Gaussian
shaping
Rx FIFO
Packet
Processing &
State Control
Tx FIFO
XTALP XTALN
Figure 1 BK2421 Chip Block Diagram
CSN
SCK
MOSI
MISO
IRQ
CE
Revision 2.0
Proprietary and Confidential
Page 3 of 25







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