TI CC2541：低功耗蓝牙4.0开发新宠

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CC2541数据手册是由TI公司（Texas Instruments）发布的一款先进的2.4GHz蓝牙模块，专为低功耗应用设计，支持蓝牙4.0技术。该模块在可穿戴设备市场中极具吸引力，由于其卓越的节能性能和私有协议的灵活性，使得它成为现代物联网(IoT)和无线通信项目中的理想选择。 CC2541的核心特性包括： 1. 射频性能：模块工作在2.4GHz蓝牙标准频率下，符合蓝牙低功耗和私有规格，提供稳定的连接和广泛的兼容性。 2. 微控制器：内置高性能8051微控制器，支持数据速率高达2Mbps，具有预取指令功能，确保高效处理和低功耗运行。 3. 存储容量：内部闪存支持128KB或256KB可编程，能够进行长距离链路预算，即使在保持功能开启状态下也能节省电量。 4. 功能与调试：硬件级调试功能允许用户方便地进行软件调试，同时具有高达0dBm的可编程发射功率，提供强大的信号输出能力。 5. 接收性能：接收器具有出色的灵敏度，尤其是在1Mbps模式下，确保了稳定的信号接收和地址解析。 6. 外设接口：设计适应广泛的应用场景，支持无线频率调节系统，包括强大的5通道DMA功能，便于内存访问。 7. 标准兼容性：符合ETSI EN300328和EN3004402类别标准，保证全球范围内的一致性和互通性。 8. 定时器：内置一个16位和两个8位定时器，满足不同应用场景下的精确时间管理。这款CC2541蓝牙模块不仅在设计上注重能效，而且提供了丰富的接口和功能，使得开发者可以快速、灵活地将其集成到各种物联网设备中，如智能手环、智能手表、健身追踪器等，从而实现低功耗、高速度的数据传输和智能交互。因此，对于那些追求高性能和低功耗的蓝牙应用来说，CC2541无疑是一个重要的技术基石。

CC2541

ZHCS708A –JANUARY 2012–REVISED FEBRUARY 2012

www.ti.com.cn

RF RECEIVE SECTION (continued)

Measured on Texas Instruments CC2541 EM reference design with T

= 25°C, VDD = 3 V, f

= 2440 MHz

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

1 Mbps, GFSK, 250-kHz Deviation, Bluetooth low energy Mode, 0.1% BER

High-gain mode –94

Receiver sensitivity

(3)(4)

dBm

Standard mode –88

Saturation

(4)

BER < 0.1% 5 dBm

Co-channel rejection

(4)

Wanted signal –67 dBm –6 dB

±1 MHz offset, 0.1% BER, wanted signal –67 dBm –2

±2 MHz offset, 0.1% BER, wanted signal –67 dBm 26

In-band blocking rejection

(4)

±3 MHz offset, 0.1% BER, wanted signal –67 dBm 34

>6 MHz offset, 0.1% BER, wanted signal –67 dBm 33

Minimum interferer level < 2 GHz (Wanted signal –67 dBm) –21

Out-of-band blocking

Minimum interferer level [2 GHz, 3 GHz] (Wanted signal –67 dBm) –25 dBm

rejection

(4)

Minimum interferer level > 3 GHz (Wanted signal –67 dBm) –7

Intermodulation

(4)

Minimum interferer level –36 dBm

Including both initial tolerance and drift. Sensitivity better than -67dBm,

Frequency error tolerance

(5)

–250 250 kHz

250 byte payload. BER 0.1%

Symbol rate error Maximum packet length. Sensitivity better than –67 dBm, 250 byte

–80 80 ppm

tolerance

(6)

payload. BER 0.1%

1 Mbps, GFSK, 160-kHz Deviation, 0.1% BER

Receiver sensitivity

(7)

–91 dBm

Saturation BER < 0.1% 0 dBm

Co-channel rejection Wanted signal 10 dB above sensitivity level –9 dB

±1-MHz offset, 0.1% BER, wanted signal –67 dBm 2

±2-MHz offset, 0.1% BER, wanted signal –67 dBm 24

In-band blocking rejection dB

±3-MHz offset, 0.1% BER, wanted signal -–67 dBm 27

>6-MHz offset, 0.1% BER, wanted signal –67 dBm 32

Including both initial tolerance and drift. Sensitivity better than –67 dBm,

Frequency error tolerance

(5)

–200 200 kHz

250-byte payload. BER 0.1%

Symbol rate error Maximum packet length. Sensitivity better than –67 dBm, 250-byte

–80 80 ppm

tolerance

(6)

payload. BER 0.1%

500 kbps, MSK, 0.1% BER

Receiver sensitivity

(7)

–99 dBm

Saturation BER < 0.1% 0 dBm

Co-channel rejection Wanted signal –67 dBm –5 dB

±1-MHz offset, 0.1% BER, wanted signal –67 dBm 20

In-band blocking rejection ±2-MHz offset, 0.1% BER, wanted signal –67 dBm 27 dB

>2-MHz offset, 0.1% BER, wanted signal –67 dBm 28

Including both initial tolerance and drift. Sensitivity better than –67 dBm,

Frequency error tolerance –150 150 kHz

250-byte payload. BER 0.1%

Maximum packet length. Sensitivity better than –67 dBm, 250-byte

Symbol rate error tolerance –80 80 ppm

payload. BER 0.1%

(3) The receiver sensitivity setting is programmable using a TI BLE stack vendor-specific API command. The default value is standard

mode.

(4) Results based on standard-gain mode.

(5) Difference between center frequency of the received RF signal and local oscillator frequency

(6) Difference between incoming symbol rate and the internally generated symbol rate

(7) Results based on high-gain mode.

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