RFM22B/23B无线通信模块技术规格与应用

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"RFM22B模块.pdf包含关于RFM22B和RFM23B芯片的详细信息，这两个芯片是用于ISM频段的无线收发器模块。资料涵盖了引脚配置、原理图以及如何基于这些模块进行无线通信开发。RFM22B和RFM23B芯片适用于各种应用，如遥控、家庭安全、遥测、个人数据记录、玩具控制、轮胎压力监测以及无线PC外设等。" RFM22B和RFM23B芯片是专为工业、科学和医疗(ISM)频段设计的无线收发模块，支持433、470、868和915MHz频率范围。它们在低功耗设计上表现出色，接收模式下电流消耗仅为18.5mA，+13dBm发射功率时为30mA，而+20dBm发射功率时则为85mA，这使得它们适合电池供电的远程设备。这两款芯片提供了出色的灵敏度，达到-121dBm，数据传输速率可调，范围从0.123kbps到256kbps，支持FSK、GFSK和OOK调制方式。它们可以在1.8V至3.6V的电源电压范围内工作，并具有超低功耗关机模式，以及数字RSSI（接收信号强度指示）功能。此外，还配备了唤醒定时器、自动频率校准（AFC）、上电复位（POR）和天线多样性及TR开关控制。 RFM22B和RFM23B模块集成了包处理器、前导检测器、64字节的发送和接收FIFO（先进先出队列），以及低电量检测器。它们还配备了一个温度传感器和8位ADC，能够在-40°C到+85°C的温度范围内稳定工作。内置电压调节器简化了系统设计，同时芯片还支持频率跳变能力，以及片上晶体调谐功能。封装形式有14引脚DIP和16引脚SMD两种，降低了成本，使其成为许多低成本无线应用的理想选择。由于其多样化的功能和广泛应用场景，RFM22B和RFM23B芯片被广泛应用于远程读表、无钥匙进入系统、家庭自动化、工业控制、传感器网络和健康监测等领域。开发人员可以利用这些模块快速构建高效、可靠的无线通信系统。

RF23B

RFM22B/23B RFM22B/23B

100p

4 12

ANT1

GPIO0

GPIO1

GPIO2

DIG

SDN

XIN

XOUT

nIRQ

nSEL

100n

VDD_RF

RFp

30MHz

GP1

GP2

SCLK

GP3

SDI

GP4

SDO

GP5

VDD

microcontroller

RXn

VDD_D

RFM23B MODULE

VSS

Figure 1. RFM23B Application Example

Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com http://www.hoperf.com

Tel: +86-755-82973805 Fax: +86-755-82973550 E-mail: sales@hoperf.com

RFM22B/23B

3. Controller Interface

3.1. Serial Peripheral Interface (SPI)

The RFM22B/23B communicates with the host MCU over a standard 3-wire SPI interface: SCLK, SDI, and nSEL.

The host MCU can read data from the device on the SDO output pin. A SPI transaction is a 16-bit sequence which

consists of a Read-Write (R/W) select bit, followed by a 7-bit address field (ADDR), and an 8-bit data field (DATA) as

demonstrated in Figure 3. The 7-bit address field is used to select one of the 128, 8-bit control registers. The R/W

select bit determines whether the SPI transaction is a read or write transaction. If R/W = 1 it signifies a WRITE

transaction, while R/W = 0 signifies a READ transaction. The contents (ADDR or DATA) are latched into the

RFM22B/23B every eight clock cycles. The timing parameters for the SPI interface are shown in Table 10. The

SCLK rate is flexible with a maximum rate of 10 MHz.

Address

Data

RW A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0 xx xx RW A7

SDI

MSB LSB

SCLK

nSEL

Figure 3. SPI

Timing

Table 10. Serial Interface Timing Parameters

Symbol Parameter Min (nsec)

Diagram

Clock high time

Clock low time

Data setup time

Data hold time

Output data delay time

Output enable time

Output disable time

Select setup time

Select hold time

Select high period

SCLK

SDI

SDO

nSEL

To read back data from the RFM22B/23B, the R/W bit must be set to 0 followed by the 7-bit address of the register

from which to read. The 8 bit DATA field following the 7-bit ADDR field is ignored on the SDI pin when R/W = 0. The

next eight negative edge transitions of the SCLK signal will clock out the contents of the selected register. The data

read from the selected register will be available on the SDO output pin. The READ function is shown in Figure 4.

After the READ function is completed the SDO pin will remain at either a logic 1 or logic 0 state depending on the

last data bit clocked out (D0). When nSEL goes high the SDO output pin will be pulled high by internal pullup.

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