nRF24LU1_v1_1：2.4GHz超低功耗无线系统单片机详细规格

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nRF24LU1_v1_1是一款专为低功耗无线系统设计的超紧凑型解决方案，它由NordicSemiconductor公司制造。这款芯片集成了多种关键功能，使其在众多应用领域表现出色，包括计算机外围设备、智能家居、安防系统、RFID跟踪与监控以及高级远程控制。 1. **无线通信能力**： nRF24LU1采用了2.4GHz频段的nRF24L01+收发器，支持高达250kbps、1Mbps和2Mbps的空中数据传输速率，满足高速和低功耗的需求。这使得它非常适合无线鼠标、键盘、遥控器以及游戏控制器等设备。 2. **微控制器集成**：内置8051兼容的快速微控制器，提供了高效的数据处理和控制能力，便于用户编写和运行实时操作系统（RTOS）或自定义应用程序。 3. **存储容量**：芯片内置16KB程序存储器（on-chip Flash）、1kB数据存储器（on-chip RAM）以及可扩展的1kB和512字节非易失性数据存储器(NV data memory)，为软件开发和数据存储提供足够的空间。 4. **安全增强功能**：包含AES加密硬件加速器，确保数据传输的安全性，同时还有16-32位乘法/除法协处理器(MDU)进行复杂计算，提高了加密算法的执行效率。 5. **传感器和工业应用**：支持传感器网络和主动RFID技术，适用于资产追踪、环境监测和其他物联网(IoT)应用。此外，其灵活性高的输入输出接口也适合于音频视频控制和娱乐中心设备。 6. **电源管理**： nRF24LU1具备多种工作模式，从超低功耗到高效的活动模式，能根据应用场景灵活调整能源消耗，延长电池寿命。 7. **封装选项**：提供了不同尺寸的QFN封装，如X4×4mm QFN24、X5×5mm QFN32和X7×7mm QFN48，适应不同的尺寸和散热需求。 8. **调试与升级**：芯片内置硬件调试功能，方便开发者在生产过程中进行故障排查和性能优化。同时，还支持固件升级，便于软件的持续改进和维护。 9. **广泛应用**： nRF24LU1广泛应用于多个行业，如支付系统、报警系统、智能家居自动化和消费电子产品的高级遥控器等。 nRF24LU1_v1_1凭借其卓越的无线通信能力、丰富的内置资源和高度的灵活性，成为构建低成本、低功耗无线解决方案的理想选择。无论是嵌入式设备还是物联网应用，都能找到其发挥独特价值的位置。

Revision 1.6 16 of 196

nRF24LE1 Product Specification

3 RF transceiver

The nRF24LE1 uses the same 2.4 GHz GFSK RF transceiver with embedded protocol engine (Enhanced

ShockBurst™) that is found in the nRF24L01+ single chip RF transceiver. The RF transceiver is designed

for operation in the world wide ISM frequency band at 2.400 - 2.4835 GHz and is very well suited for ultra

low power wireless applications.

The RF transceiver module is configured and operated through the RF transceiver map. This register map

is accessed by the MCU through a dedicated on-chip Serial Peripheral interface (SPI) and is available in all

power modes of the RF transceiver module.

The embedded protocol engine (Enhanced ShockBurst™) enables data packet communication and sup-

ports various modes from manual operation to advanced autonomous protocol operation. Data FIFOs in

the RF transceiver module ensure a smooth data flow between the RF transceiver module and the

nRF24LE1 MCU.

The rest of this chapter is written in the context of the RF transceiver module as the core and the rest of the

nRF24LE1 as external circuitry to this module.

3.1 Features

Features of the RF transceiver include:

• General

X Worldwide 2.4 GHz ISM band operation

X Common antenna interface in transmit and receive

X GFSK modulation

X 250kbps, 1 and 2Mbps on air data rate

• Transmitter

X Programmable output power: 0, -6, -12 or -18dBm

X 11.1mA at 0dBm output power

• Receiver

X Integrated channel filters

X 13.3mA at 2Mbps

X -82dBm sensitivity at 2 Mbps

X -85dBm sensitivity at 1 Mbps

X -94dBm sensitivity at 250 kbps

• RF Synthesizer

X Fully integrated synthesizer

X 1 MHz frequency programming resolution

X Accepts low cost ±60 ppm 16 MHz crystal

X 1 MHz non-overlapping channel spacing at 1 Mbps

X 2 MHz non-overlapping channel spacing at 2 Mbps

• Enhanced ShockBurst™

X 1 to 32 bytes dynamic payload length

X Automatic packet handling (assembly/disassembly)

X Automatic packet transaction handling (auto ACK, auto retransmit)

• 6 data pipe MultiCeiver™ for 6:1 star networks

Revision 1.6 19 of 196

nRF24LE1 Product Specification

Standby-II mode

In standby-II mode extra clock buffers are active and more current is used compared to standby-I mode.

The RF transceiver enters standby-II mode if the rfce bit is held high on a PTX operation with an empty

TX FIFO. If a new packet is downloaded to the TX FIFO, the PLL immediately starts and the packet is

transmitted after the normal PLL settling delay (130µs).

The register values are maintained and the SPI can be activated during both standby modes. For start up

times see Table 4. on page 20

3.3.1.4 RX mode

The RX mode is an active mode where the RF transceiver is used as a receiver. To enter this mode, the RF

transceiver must have the PWR_UP bit, PRIM_RX bit and the rfce bit is set high.

In RX mode the receiver demodulates the signals from the RF channel, constantly presenting the demodu-

lated data to the baseband protocol engine. The baseband protocol engine constantly 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 pre-

sented in a vacant slot in the RX FIFOs. If the RX FIFOs are full, the received packet is discarded.

The RF transceiver 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 RF transceiver can enter other modes in order to execute the protocol.

In RX mode a Received Power Detector (RPD) signal is available. The RPD is a signal that is set high

when a RF signal higher than -64 dBm is detected inside the receiving frequency channel. The internal

RPD signal is filtered before presented to the RPD register. The RF signal must be present for at least 40µs

before the RPD is set high. How to use the RPD is described in Section 3.3.4 on page 21

3.3.1.5 TX mode

The TX mode is an active mode for transmitting packets. To enter this mode, the RF transceiver must have

the PWR_UP bit set high, PRIM_RX bit set low, a payload in the TX FIFO and a high pulse on the rfce bit

for more than 10 µs.

The RF transceiver stays in TX mode until it finishes transmitting a packet. If rfce = 0, RF transceiver

returns to standby-I mode. If rfce = 1, the status of the TX FIFO determines the next action. If the TX

FIFO is not empty the RF transceiver remains in TX mode and transmits the next packet. If the TX FIFO is

empty the RF transceiver goes into standby-II mode. The RF transceiver transmitter PLL operates in open

loop when in TX mode. It is important never to keep the RF transceiver in TX mode for more than 4ms at a

time. If the Enhanced ShockBurst™ features are enabled, RF transceiver is never in TX mode longer than

4 ms.

Revision 1.6 20 of 196

nRF24LE1 Product Specification

3.3.1.6 Operational modes configuration

The following table (Table 3.) describes how to configure the operational modes.

Table 3. RF transceiver main modes

3.3.1.7 Timing information

The timing information in this section relates to the transitions between modes and the timing for the rfce

bit. The transition from TX mode to RX mode or vice versa is the same as the transition from the standby

modes to TX mode or RX mode (130µs), as described in Table 4.

Table 4. Operational timing of RF transceiver

Note: If VDD is turned off, or if the nRF24LE1 enters Deep Sleep or Memory Retention mode, the

RX modes.

Mode

PWR_UP

PRIM_RX

rfce FIFO state

RX mode111-

TX mode 1 0 1 Data in TX FIFO. Will empty all lev-

els in TX FIFO

a. If the rfce bit is held high the TX FIFO is emptied and all necessary ACK and possible retransmits

are carried out. The transmission continues as long as the TX FIFO is refilled. If the TX FIFO is empty

when the rfce bit is still high, the RF transceiver enters standby-II mode. In this mode the transmis-

sion of a packet is started as soon as the

rfcsn is set high after an upload (UL) of a packet to TX

FIFO.

TX mode 1 0 Minimum 10µs

high pulse

Data in TX FIFO.Will empty one

level in TX FIFO

b. This operating mode pulses the rfce bit high for at least 10µs. This allows one packet to transmit.

This is the normal operating mode. After the packet is transmitted, the RF transceiver enters standby-

I mode.

Standby-II 1 0 1 TX FIFO empty

Standby-I 1 - 0 No ongoing packet transmission

Power Down 0 - - -

Name RF Transceiver Max. Min. Comments

Tpd2stby Power Down Î Standby mode

1µs

a. This presupposes that the XO is running. Please refer to CLKLFCTRL for bit 3 in Table 59. on page

112.

Tstby2a Standby modes Î TX/RX mode 130µs

Thce Minimum rfce high 10µs

Tpece2csn Delay from rfce pos. edge to

rfcsn low

4µs

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