PRODUCT SPECIFICATION
nRF2402 Single Chip 2.4 GHz Radio Transmitter
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 2.2 Page 13 of 33 May 2006
Direct Mode
In direct mode the nRF2402 works like a traditional RF device. The data rate must be
1Mbps ±200ppm, or 250kbps ±200ppm at low data rate setting, for the receiver
(nRF2401A/nRF24E1) to detect the signals.
MCU interface pins: CE, DIN
1. When application MCU has data to send, set CE high
2. The nRF2402 RF front end is now immediately activated, and after 200 µs
settling time, signal on the DIN pin will modulate the carrier directly.
3. All RF protocol parts must hence be implemented in MCU firmware
(preamble, address and CRC).
Configuration Mode
In configuration mode a configuration word of up to 20 bits is downloaded to
nRF2402. This is done through a simple 3-wire interface (CS, CLK and DIN). For
more information on configuration please refer to the nRF2402 device configuration
chapter, page14.
Power Down Mode
Power down mode is used to achieve very low current consumption. Effectively the
chip is disabled with minimal leakage current consumption, typically less than 200nA.
Operating in this mode when not transmitting data significantly increases battery
lifetime.
Stand-By Mode
Stand by mode is used to achieve low current consumption. In this mode only a part
of the crystal oscillator is running (12µA) to guarantee a short start-up time. Operating
in this mode when not transmitting data increases battery lifetime while keeping start
up delays short.
Pin configuration for the different modes of nRF2402
nRF2402 MODES
INPUT PINS
Pin Name
PWR_UP CE CS CLK DIN
Power down 0 0 X X X
Stand by 1 0 0 X X
Configuration 1 0 1 CLK CONFIG DATA
TX ShockBurst™ 1 1 0 CLK TX DATA
TX Direct
1 1 0
Set to 0
∗
TX DATA
Table 6 Pin configuration of nRF2402.
∗
CLK not used in direct mode.
