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product specification nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 1 of 38 december 2004 single chip 2.4 ghz transceiver features applications ? true single chip gfsk transceiver in a small 24-pin package (qfn24 5x5mm) ? wireless mouse, keyboard, joystick ? keyless entry ? data rate 0 to1mbps ? wireless data communication ? only 2 external components ? alarm and security systems ? multi channel operation ? 125 channels ? channel switching time <200 s. ? support frequency hopping ? home automation ? surveillance ? automotive ? data slicer / clock recovery of data ? telemetry ? address and crc computation ? intelligent sports equipment ? duoceiver? for simultaneous dual receiver topology ? shockburst? mode for ultra-low power operation and relaxed mcu performance ? industrial sensors ? toys ? power supply range: 1.9 to 3.6 v ? low supply current (tx), typical 10.5ma peak @ -5dbm output power ? low supply current (rx), typical 18ma peak in receive mode ? 100 % rf tested ? no need for external saw filter ? world wide use general description nrf2401a is a single-chip radio transcei ver for the world wide 2.4 - 2.5 ghz ism band. the transceiver consists of a fully in tegrated frequency synthesizer, a power amplifier, a crystal oscillator and a modulat or. output power and frequency channels are easily programmable by use of the 3-wire serial interface. current consumption is very low, only 10.5ma at an output power of -5dbm and 18ma in receive mode. built-in power down modes makes power saving easily realizable. quick reference data parameter value unit minimum supply voltage 1.9 v maximum output power 0 dbm maximum data rate 1000 kbps supply current in transmit @ -5dbm output power 10.5 ma supply current in receive mode 18 ma temperature range -40 to +85 c sensitivity -93 dbm supply current in power down mode 400 na table 1 nrf2401a quick reference data nrf2401a
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 2 of 38 december 2004 type number description version nrf2401a 24 pin qfn 5x5 a nrf2401ag 24 pin qfn 5x5, lead free (green) a NRF2401A-EVKIT evaluation kit (2 test pcb, 2 configuration pcb, sw) 1.0 table 2 nrf2401a ordering information block diagram dvdd vdd=3v vdd=3v xc1 xc2 400 ? iref vdd_pa=1.8v vss_pa=0v ant1 ant2 22k ? vss=0v vss=0v vdd=3v vss=0v vss=0v frequency synthesiser pa lna if bpf demod clock recovery, dataslicer addr decode fifo in/out crc code/decode duoceiver tm shockburst tm gfsk filter data cs clk1 3-wire interface pwr_up ce clk2 dout2 dr2 dr1 data channel 2 data channel 1 figure 1 nrf2401a with external components.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 3 of 38 december 2004 pin functions pin name pin function description 1 ce digital input chip enable activates rx or tx mode 2 dr2 digital output rx data ready at data channel 2 (shockburst? only) 3 clk2 digital i/o clock output/input for rx data channel 2 4 dout2 digital output rx data channel 2 5 cs digital input chip select activates configuration mode 6 dr1 digital output rx data ready at data channel 1 (shockburst? only) 7 clk1 digital i/o clock input (tx) & output/input (rx) for data channel 1 3-wire interface 8 data digital i/o rx data channel 1/tx data input/ 3-wire interface 9 dvdd power output positive digital supply output for de-coupling purposes 10 vss power ground (0v) 11 xc2 analog output crystal pin 2 12 xc1 analog input crystal pin 1 13 vdd_pa power output power supply (+1.8v) to power amplifier 14 ant1 rf antenna interface 1 15 ant2 rf antenna interface 2 16 vss_pa power ground (0v) 17 vdd power power supply (+3v dc) 18 vss power ground (0v) 19 iref analog input reference current 20 vss power ground (0v) 21 vdd power power supply (+3v dc) 22 vss power ground (0v) 23 pwr_up digital input power up 24 vdd power power supply (+3v dc) table 3 nrf2401a pin function pin assignment vdd data nrf2401a qfn24 5x5 dvdd vdd pwr_up vss ant2 vss vss_pa clk1 ce 23 22 21 24 9 8 7 4 3 2 1 18 17 16 6 5 vdd_pa ant1 14 iref vss 20 19 11 12 13 15 10 cs xc2 xc1 dr1 dr2 clk2 vdd vss figure 2 nrf2401a pin assignment (t op view) for a qfn24 5x5 package.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 4 of 38 december 2004 electrical specifications conditions: vdd = +3v, vss = 0v, t a = - 40oc to + 85oc symbol parameter (condition) notes min. typ. max. units operating conditions vdd supply voltage 1.9 3.0 3.6 v temp operating temperature -40 +27 +85 oc digital input pin v ih high level input voltage vdd- 0.3 vdd v v il low level input voltage vss 0.3 v digital output pin v oh high level output voltage (i oh =-0.5ma) vdd- 0.3 vdd v v ol low level output voltage (i ol =0.5ma) vss 0.3 v general rf conditions f op operating frequency 1) 2400 2524 mhz f xtal crystal frequency 2) 4 20 mhz ? f frequency deviation 156 khz r gfsk data rate shockburst? >0 1000 kbps r gfsk data rate direct mode 3) 250 1000 kbps f channel channel spacing 1 mhz transmitter operation p rf maximum output power 4) 0 +4 dbm p rfc rf power control range 16 20 db p rfcr rf power control range resolution 3 db p bw 20db bandwidth for modulated carrier 1000 khz p rf2 2 nd adjacent channel transmit power 2mhz -20 dbm p rf3 3 rd adjacent channel transmit power 3mhz -40 dbm i vdd supply current @ 0dbm output power 5) 13 ma i vdd supply current @ -20dbm output power 5) 8.8 ma i vdd average supply current @ -5dbm output power, shockburst? 6) 0.8 ma i vdd average supply current in stand-by mode 7) 12 a i vdd average supply current in power down 400 na receiver operation i vdd supply current one channel 250kbps 18 ma i vdd supply current one channel 1000kbps 19 ma i vdd supply current two channels 250kbps 23 ma i vdd supply current two channels 1000kbps 25 ma rx sens sensitivity at 0.1%ber (@250kbps) -93 dbm rx sens sensitivity at 0.1%ber (@ 1000kbps) -85 dbm c/i co c/i co-channel 8) 10/4 db c/i 1st 1 st adjacent channel selectivity c/i 1mhz 8) -20/0 db c/i 2nd 2 nd adjacent channel selectivity c/i 2mhz 8) -37/-20 db c/i 3rd 3 rd adjacent channel selectivity c/i 3mhz 8) -43/-30 db rx b blocking data channel 2 -45/-41 db 1) usable band is determined by local regulations 2) the crystal frequency may be chosen from 5 different values (4, 8, 12, 16, and 20mhz) which are specified in the configuration word, see table 8. 16mhz are required for 1mbps operation. 3) data rate must be either 250kbps or 1000kbps. 4) antenna load impedance = 100 ? +j175 ? 5) antenna load impedance = 100 ? +j175 ? . effective data rate 250kbps or 1mbps. 6) antenna load impedance = 100 ? +j175 ? . effective data rate 10kbps. 7) current if 4 mhz crystal is used. 8) 250kbps/1000kbps. table 4 nrf2401a rf specifications
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 5 of 38 december 2004 package outline nrf2401ag uses the green qfn24 5x5 package, with matt tin plating. nrf2401a uses the qfn24 5x5 package, with snpb plating. dimensions are in mm. package type a a 1 a2 b d/e d1/e1 e j k l r punch qfn24 (5x5 mm) min typ. max 0.8 0.9 0.0 0.02 0.05 0.65 0.69 0.25 0.3 0.35 5 bsc 4.75 bsc 0.65 bsc 3.47 3.57 3.67 3.47 3.57 3.67 0.3 0.4 0.5 1.235 1.335 1.435 figure 3 nrf2401ag green package outline.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 6 of 38 december 2004 absolute maximum ratings supply voltages vdd............................- 0.3v to + 3.6v vss .................................................. 0v input voltage v i ....................... - 0.3v to vdd + 0.3v output voltage v o ...................... - 0.3v to vdd + 0.3v total power dissipation p d (t a =85 c) ............................. 90mw temperatures operating temperature?. - 40 c to + 85 c storage temperature?.? - 40 c to + 125 c note: stress exceeding one or more of the limiting values may cause permanent damage to the device. attention! electrostatic sensitive device observe precaution for handling.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 7 of 38 december 2004 glossary of terms term description clk clock crc cyclic redundancy check cs chip select ce chip enable dr data ready gfsk gaussian frequency shift keying ism industrial-scientific-medical mcu micro controller od overdrive pwr_dwn power down pwr_up power up rx receive st_by standby tx transmit table 5 glossary
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 8 of 38 december 2004 modes of operation overview the nrf2401a can be set in the following main modes depending on three control pins: mode pwr_up ce cs active (rx/tx) 1 1 0 configuration 1 0 1 stand by 1 0 0 power down 0 x x table 6 nrf2401a main modes for a complete overview of the nrf2401a i/o pins in the different modes please refer to table 7. active modes the nrf2401a has two active (rx/tx) modes: ? shockburst? ? direct mode the device functionality in these modes is d ecided by the content of a configuration word. this configuration word is pr esented in configuration section.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 9 of 38 december 2004 shockburst? the shockburst? technology uses on-chip fifo to clock in data at a low data rate and transmit at a very high rate t hus enabling extremely power reduction. when operating the nrf2401a in shockburst ?, you gain access to the high data rates (1 mbps) offered by the 2.4 ghz band w ithout the need of a costly, high-speed micro controller (mcu) for data processing. by putting all high speed signal processing related to rf protocol on-chip, the nrf2401a offers the following benefits: ? highly reduced current consumption ? lower system cost (facilitates use of less expensive micro controller) ? greatly reduced risk of ?on-air? collisions due to short transmission time the nrf2401a can be programmed using a s imple 3-wire interface where the data rate is decided by the speed of the micro controller. by allowing the digital part of the application to run at low speed while maximizing the data rate on the rf link, the nrf shoc kburst? mode reduces the average current consumption in applications considerably. shockburst? principle when the nrf2401a is configured in shockburst?, tx or rx operation is conducted in the following way (10 kbps for the example only). 8-bit mcu nrf2401a continuous 10kbps 1mbps shockburst tm fifo figure 4 clocking in data with mcu and sending with shockburst ? technology time ms 0 20406080100120 140 160 180 200 220 240 10ma periode 10ma period without shockburst tm , running at speed dictated by 10kbs mcu 10kbs mcu with shockburst tm figure 5 current consumption with & without shockburst ? technology
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 10 of 38 december 2004 ucontroller loading addr and payl oad data nrf2401a calculating crc addr payload addr payload crc data content of registers: nrf2401a in shockburst tm tx (ce=hi)? yes maximum 256 bits nrf2401a adding preamble nrf2401a sending shockburst tm package (250 or 1000kbps) pre- amble addr payload crc sending completed? yes no ce=low? yes no input fifo not empty no figure 6 flow chart shockburst? transmit of nrf2401a nrf2401a shockburst? transmit: mcu interface pins: ce, clk1, data 1. when the application mcu has data to send, set ce high. this activates nrf2401a on-board data processing. 2. the address of the receiving node (r x address) and payload data is clocked into the nrf2401a. the app lication protocol or mcu sets the speed <1mbps (ex: 10kbps). 3. mcu sets ce low, this activates a nrf2401a shockburst? transmission. 4. nrf2401a shockburst?: ? rf front end is powered up ? rf package is completed (preamble added, crc calculated) ? data is transmitted at high speed (250 kbps or 1 mbps configured by user). ? nrf2401a return to stand-by when finished
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 11 of 38 december 2004 correct addr? nrf2401a detects preamble and incoming data nrf2401a set data ready (dr1/2) high yes yes no no nrf2401a receives data and checking crc addr payload crc addr payload crc addr payload crc pre- amble addr payload crc payload ucontroller clocks out payload payload data content of registers: nrf2401a register empty? nrf2401a sets data ready (dr1/2) low no yes output register empty nrf2401a in shockburst tm rx? yes no nrf2401a checks: correct crc? figure 7 flow chart shockburst? receive of nrf2401a
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 12 of 38 december 2004 nrf2401a shockburst? receive: mcu interface pins: ce, dr1, clk1 and data (one rx channel receive) 1. correct address and size of payload of incoming rf packages are set when nrf2401a is configured to shockburst? rx. 2. to activate rx, set ce high. 3. after 200 s settling, nrf2401a is monitoring the air for incoming communication. 4. when a valid package has been received (correct address and crc found), nrf2401a removes the preamble, address and crc bits. 5. nrf2401a then notifies (interrupts) th e mcu by setting the dr1 pin high. 6. mcu may (or may not) set the ce low to disable the rf front end (low current mode). 7. the mcu will clock out just the payload data at a suitable rate (ex. 10 kbps). 8. when all payload data is retrieved nrf2401a sets dr1 low again, and is ready for new incoming data package if ce is kept high during data download. if the ce was set low, a new start up sequence can begin, see figure 16. direct mode in direct mode the nrf2401a works like a traditional rf device. data must be at 1mbps 200ppm, or 250kbps 200ppm at low data rate setting, for the receiver to detect the signals. direct mode transmit: mcu interface pins: ce, data 1. when application mcu has da ta to send, set ce high 2. the nrf2401a rf front end is now immediately activated, and after 200 s settling time, data will modulate the carrier directly. 3. all rf protocol parts must hence be implemented in mcu firmware (preamble, address and crc). direct mode receive: mcu interface pins: ce, clk1, and data 1. once the nrf2401a is configured and powered up (ce high) in direct rx mode, data will start to toggle due to noise present on the air. 2. clk1 will also start to toggle as nrf2401a is trying to lock on to the incoming data stream. 3. once a valid preamble arrives, clk1 and data will lock on to the incoming signal and the rf package will appear at the data pin with the same speed as it is transmitted. 4. to enable the demodulator to re-gen erate the clock, the preamble must be 8 bits toggling hi-low, starting with low if the first data bit is low. 5. in this mode no data ready (dr) signals is available. address and checksum verification must also be done in the receiving mcu.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 13 of 38 december 2004 duoceiver? simultaneous two channel receive mode in both shockburst? & direct modes the nrf2401a can facilitate simultaneous reception of two parallel independent frequenc y channels at the maximum data rate. this means: ? nrf2401a can receive data from two 1 mbps transmitters (ex: nrf2401a or nrf2402) 8 mhz (8 frequency ch annels) apart through one antenna interface. ? the output from the two data channe ls is fed to two separate mcu interfaces. ? data channel 1: clk1, data, and dr1 ? data channel 2: clk2, dout2, and dr2 ? dr1 and dr2 are available only in shockburst?. the nrf2401a duoceiver? technology provide s 2 separate dedicated data channels for rx and replaces the need for two, stand alone receiver systems. nrf2401a tx/rx nrf2401a tx/rx nrf2401a tx / rx figure 8 simultaneous 2 channel receive on nrf2401a there is one absolute requirement for using the second data channel. for the nrf2401a to be able to receive at the second data channel the frequency channel must be 8mhz higher than the frequency of data channel 1. the nrf2401a must be programmed to receive at the frequency of data channel 1. no time multiplexing is used in nrf2401a to fulfil this function. in direct mode the mcu must be able to handle two simultaneously incoming data packets if it is not multiplexing between the two data channels. in shockburst? it is po ssible for the mcu to clock out one data channel at a time while data on the other data channel waits for mcu availability, without any lost data packets, and by doi ng so reduce the needed performance of the mcu. f rf1 f rf2 =f rf1 +8mhz clock recovery, dataslicer addr, crc check clock recovery, dataslicer addr, crc check dr1 dr2 clk1 data clk2 dout2 data(f rf1 ) data(f rf2 ) figure 9 duoceiver tm with two simultaneously independent receive channels.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 14 of 38 december 2004 configuration mode in configuration mode a c onfiguration word of up to 15 bytes is downloaded to nrf2401a. this is done through a simple 3-wire interface (cs, clk1 and data). for more information on configuration please refer to the nrf2401a device configuration chapter on page16. stand-by mode stand by mode is used to minimize average current consumption while maintaining short start up times. in this mode, part of the crystal oscillator is active. current consumption is dependent on crystal frequency (ex: 12 a @ 4 mhz, 32 a @ 16 mhz). the configuration word conten t is maintained during stand by. power down mode in power down the nrf2401a is disabl ed with minimal current consumption, typically less than 1 a. entering this mode when the device is not active minimizes average current consumption, maximizing ba ttery lifetime. the c onfiguration word content is maintained during power down.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 15 of 38 december 2004 pin configuration for the different modes of nrf2401a mode switches input pins bidir pins output pins direction direction direction nrf2401a modes rxmode shockburst pwr_up ce cs clk1 data clk2 dr1 dr2 dout2 in in in power down x x 0 x 1 1 x x x 0 0 0 in in in power down 0 1 0 x 0 x x x 0 0 0 in in in power down 1 1 0 x 0 clk x x 0 0 0 in in in stand by 0 x 1 0 0 x x x 0 0 0 in in in stand by 1 0 1 0 0 x x x 0 0 0 in in 2 in stand by 1 1 1 0 0 clk data x 0 dr2 0 in out 3 in stand by 1 1 1 0 0 clk data x 1 dr2 0 in in in configuration x x 1 0 1 clk config data x 0 0 0 in in in tx shockburst? 0 1 1 1 0 clk data x 0 0 0 in in in tx direct 0 0 1 1 0 x data x 0 0 0 in out in rx shockburst? in one channel 1 1 1 1 0 clk data x dr1 0 0 in out in rx shockburst? in two channels 1 1 1 1 0 clk data clk dr1 dr2 data out out out rx direct in one channel 1 0 1 1 0 clk data 0 0 0 0 out out out rx direct in two channels 1 0 1 1 0 clk data clk 0 0 data table 7 pin configuration of nrf2401a. 1 in = x means the input should be set to either ?low? or ?high?. 2 input if dr1 is ?low?. 3 output if dr1 is ?high?
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 16 of 38 december 2004 device configuration all configuration of the nrf2401a is done via a 3-wire interface to a single configuration register. the configurati on word can be up to 15 bytes long for shockburst? use and up to 2 bytes long for direct mode. configuration for shockburst? operation the configuration word in shockburst? enables the nrf2401a to handle the rf protocol. once the protocol is completed and loaded into nrf2401a only one byte, bit[7:0], needs to be upda ted during actual operation. the configuration blocks dedicated to shockburst? is as follows: ? payload section width : specifies the number of payload bits in a rf package. this enables the nrf2401a to distinguish between payload data and the crc bytes in a received package. ? address width : sets the number of bits used for address in the rf package. this enables the nrf2401a to distingu ish between address and payload data. ? address (rx channel 1 and 2): destina tion address for received data. ? crc : enables nrf2401a on-chip crc generation and de-coding. note: these configuration blocks, with the exception of the crc, are dedicated for the packages that a nrf2401a is to receive. in tx mode, the mcu must generate an a ddress and a payload section that fits the configuration of the nrf2401a th at is to receive the data. when using the nrf2401a on-chip crc feature ensure that crc is enabled and uses the same length for both the tx and rx devices. pre-amble address payload crc figure 10 data packet set-up configuration for direct mode operation for direct mode operation only the two first bytes (bit[15:0]) of the configuring word are relevant.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 17 of 38 december 2004 configuration word overview bit position number of bits name function 143:120 24 test reserved for testing 119:112 8 data2_w length of data payload section rx channel 2 111:104 8 data1_w length of data payload section rx channel 1 103:64 40 addr2 up to 5 byte address for rx channel 2 63:24 40 addr1 up to 5 byte address for rx channel 1 23:18 6 addr_w number of address bits (both rx channels). 17 1 crc_l 8 or 16 bit crc shockburst? configuration 16 1 crc_en enable on-chip crc generation/checking. 15 1 rx2_en enable two channel receive mode 14 1 cm communication mode (direct or shockburst?) 13 1 rfdr_sb rf data rate (1mbps requires 16mhz crystal) 12:10 3 xo_f crystal frequency 9:8 2 rf_pwr rf output power 7:1 7 rf_ch# frequency channel general device configuration 0 1 rxen rx or tx operation table 8 table of configuration words. the configuration word is shifted in msb first on positive clk1 edges. new configuration is enabled on the falling edge of cs. note. on the falling edge of cs, the nrf2401a upda tes the number of bits actually shifted in during the last configuration. ex: if the nrf2401a is to be configured for 2 channel rx in shoc kburst?, a total of 120 bits must be shifted in during the fi rst configuration afte r vdd is applied. once the wanted protocol, modus and rf ch annel are set, only one bit (rxen) is shifted in to switch between rx and tx.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 18 of 38 december 2004 configuration word detailed description the following describes the function of the 144 bits (bit 143 = msb) that is used to configure the nrf2401a. general device configuration: bit[15:0] shockburst? configuration: bit[119:16] test configuration: bit[143:120] msb test d143 d142 d141 d140 d139 d138 d137 d136 reserved for testing 1 0 0 0 1 1 1 0 default msb test d135 d134 d133 d132 d131 d130 d129 d128 d127 d126 d125 d124 d123 d122 d121 d120 reserved for testing close pll in tx 0 0 0 0 1 0 0 0 0 0 0 1 1 1 0 0 default data2_w d119 d118 d117 d116 d115 d114 d113 d112 data width channel#2 in # of bits excluding addr/crc 0 0 1 0 0 0 0 0 default data1_w d111 d110 d109 d108 d107 d106 d105 d104 data width channel#1 in # of bits excluding addr/crc 0 0 1 0 0 0 0 0 default addr2 d103 d102 d101 ?. d71 d70 d69 d68 d67 d66 d65 d64 channel#2 address rx (up to 40bit) 0 0 0 ? 1 1 1 0 0 1 1 1 default addr1 d63 d62 d61 ?. d31 d30 d29 d28 d27 d26 d25 d24 channel#1 address rx (up to 40bit) 0 0 0 ? 1 1 1 0 0 1 1 1 default addr_w d23 d22 d21 d20 d19 d18 address width in # of bits (both channels) 0 0 1 0 0 0 default crc d17 d16 crc mode 1 = 16bit, 0 = 8bit crc 1 = enable; 0 = disable 0 1 default rf-programming lsb d15 d14 d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d3 d2 d1 d0 two ch. buf od xo frequency rf power channel selection rxen 0 0 0 0 1 1 1 1 0 0 0 0 0 1 0 0 default table 9 configuration data word the msb bit should be loaded first into the configuration register. default configuration word: h8e08.1c20.2000.0000.00e7.0000.0000.e721.0f04.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 19 of 38 december 2004 shockburst? configuration: the section bit[119:16] contains the segments of the configuration register dedicated to shockburst? operationa l protocol. after vdd is turned on shockburst? configuration is done once and remains se t whilst vdd is present. during operation only the first byte for frequency channel and rx/tx switching need to be changed. pll_ctrl pll_ctrl d121 d120 pll 0 0 open tx/closed rx 0 1 open tx/open rx 1 0 closed tx/closed rx 1 1 closed tx/open rx table 10 pll setting. bit 121-120: pll_ctrl: controls the setting of the pll for test purposes. with closed pll in tx no deviation will be present. for normal operational mode these two bits must both be low. datax_w data2_w 119 118 117 116 115 114 113 112 data1_w 111 110 109 108 107 106 105 104 table 11 number of bits in payload. bit 119 ? 112: data2_w: length of rf package payload section for receive-channel 2. bit 111 ? 104: data1_w: length of rf package payload section for receive-channel 1. note: the total number of bits in a shockburst? rf package may not exceed 256! maximum length of payload section is hence given by: crc w addr bits w datax ? ? = _ 256 ) ( _ where: addr_w: length of rx address set in configuration word b[23:18] crc: check sum, 8 or 16 bits set in configuration word b[17] pre: preamble, 8 bits are automatically included shorter address and crc leaves more room for payload data in each package.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 20 of 38 december 2004 addrx addr2 103 102 101 ?. 71 70 69 68 67 66 65 64 addr1 63 62 61 ?. 31 30 29 28 27 26 25 24 table 12 address of receiver #2 and receiver #1. bit 103 ? 64: addr2: receiver address channel 2, up to 40 bit. bit 63 ? 24: addr1 addr1: receiver address channel 1, up to 40 bit. note! bits in addrx exceeding the address width set in addr_w are redundant and can be set to logic 0. addr_w & crc addr_w crc_l crc_en 23 22 21 20 19 18 17 16 table 13 number of bits reserved for rx address + crc setting. bit 23 ? 18: addr_w: number of bits reserved for rx address in shockburst? packages. note: maximum number of address bits is 40 (5 bytes). values over 40 in addr_w are not valid. bit 17: crc_l: crc length to be calculated by nrf2401a in shockburst?. logic 0: 8 bit crc logic 1: 16 bit crc bit: 16: crc_en: enables on-chip crc generation (tx) and verification (rx). logic 0: on-chip crc generation/checking disabled logic 1: on-chip crc generation/checking enabled note: an 8 bit crc will increase the number of payload bits possible in each shockburst? data packet, but will also reduce the system integrity.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 21 of 38 december 2004 general device configuration: this section of the configuration word handles rf and device related parameters. modes: rx2_en cm rfdr_sb xo_f rf_pwr 15 14 13 12 11 10 9 8 table 14 rf operational settings. bit 15: rx2_en: logic 0: one channel receive logic 1: two channels receive note: in two channels receive, the nr f2401a receives on two, separate frequency channels simultaneously. th e frequency of receive channel 1 is set in the configuration word bit[7-1], receive channel 2 is always 8 channels (8 mhz) above receive channel 1. bit 14: communication mode: logic 0: nrf2401a operates in direct mode. logic 1: nrf2401a operates in shockburst? mod e bit 13: rf data rate: logic 0: 250 kbps logic 1: 1 mbps note: utilizing 250 kbps instead of 1mbps will improve the receiver sensitivity by 10 db. 1mbps requires 16mhz crystal. bit 12-10: xo_f: selects the nrf2401a crystal frequency to be used: xo frequency selection d12 d11 d10 crystal frequency [mhz] 0 0 0 4 0 0 1 8 0 1 0 12 0 1 1 16 1 0 0 20 table 15 crystal frequency setting.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 22 of 38 december 2004 bit 9-8: rf_pwr: sets nrf2401a rf out put power in transmit mode: rf output power d9 d8 p [dbm] 0 0 -20 0 1 -10 1 0 -5 1 1 0 table 16 rf output power setting. rf channel & direction rf_ch# rxen 7 6 5 4 3 2 1 0 table 17 frequency channel and rx / tx setting. bit 7 ? 1: rf_ch#: sets the frequency channel the nrf2401a operates on. the channel frequency in transmit is given by: mhz ch rf mhz channel rf 0 . 1 # _ 2400 ? + = rf_ch #: between 2400mhz and 2527mhz may be set. the channel frequency in data channel 1 is given by: mhz ch rf mhz channel rf 0 . 1 # _ 2400 ? + = (receive at pin#8) rf_ch #: between 2400mhz and 2524mhz may be set. note: the channels above 83 can only be utilized in certain territories (ex: japan) the channel frequency in data channel 2 is given by: mhz ch rf mhz channel rf 0 . 1 # _ 2400 ? + = +8mhz (receive at pin#4) rf_ch #: between 2408mhz and 2524mhz may be set. bit 0: set active mode: logic 0: transmit mode logic 1: receive mode
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 23 of 38 december 2004 data package description pre-amble address payload crc figure 11 data package diagram the data packet for both shockburst? m ode and direct mode communication is divided into 4 sections. these are: 1. preamble ? the preamble field is required in shockburst? and direct modes. ? preamble is 8 bits in length and is depe ndent of the first data bit in direct mode. preamble 1 st addr-bit 01010101 0 10101010 1 ? preamble is automatically added to the data packet in shockburst? and thereby gives extra space for payload. in direct mode mcu must handle preamble. in shockburst? mode rx, the preamble is removed from the received output data, in direct mode the preamble is transparent to the output data. 2 address ? the address field is required in shockburst? mode. 1 ? 8 to 40 bits length. ? address automatically removed from received packet in shockburst? mode. in direct mode mcu must handle address. 3 payload ? the data to be transmitted ? in shockburst? mode payload size is 256 bits minus the following: (address: 8 to 40 bits. + crc 8 or 16 bits). ? in direct mode the maximum packet size (length) is for 1mbps 4000 bits (4ms). 4 crc ? the crc is optional in shockburst? mode, and is not used in direct mode. ? 8 or 16 bits length ? the crc is removed from the received output data in shockburst? rx. table 18 data package description 1 suggestions for the use of addresses in shockburst?: in general more bits in the address gives less false detection, which in the end may give lower data packet loss. a. the address made by (5, 4, 3, or 2) equal bytes are not recommended because it in general will make the packet-error-rate increase. b. addresses where the level shift only one time (i.e. 000fffffff) could often be detected in noise that may give a false detection, which again may give raised packet-error-rate. direct mode will be dependent on the software used in the mcu, but it is recommended to have the same restrictions on addresses for this mode.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 24 of 38 december 2004 important timing data the following timing applies for operation of nrf2401a. nrf2401a timing information nrf2401a timing max. min. name pwr_dwn ? configuration mode 3ms tpd2cfgm pwr_dwn ? active mode (rx/tx) 3ms tpd2a st_by ? tx shockburst? 195 s tsby2txsb st_by ? tx direct mode 202 s tsby2txdm st_by ? rx mode 202 s tsby2rx minimum delay from cs to data. 5 s tcs2data minimum delay from ce to data. 5 s tce2data minimum delay from dr1/2 to clk. 50ns tdr2clk maximum delay from clk to data. 50ns tclk2data delay between edges 50ns td setup time 500ns ts hold time 500ns th delay to finish internal gfsk data 1/data rate tfd minimum input clock high 500ns thmin set-up of data in direct mode 50ns tsdm minimum clock high in direct mode 300ns thdm minimum clock low in direct mode 230ns tldm time on air, tx direct mode 4ms toadm table 19 operational timing of nrf2401a when the nrf2401a is in power down it must always settle in stand by for 3ms before it can enter configuration or one of the active modes. pwr_up data ce tpd2cfgm clk1 cs figure 12 timing diagram for power down (or vdd off) to configuration mode for nrf2401a.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 25 of 38 december 2004 pwr_up data ce tpd2a clk1 cs figure 13 power down (or vdd off) to active mode note that the configuration word will be lost when vdd is turned off and that the device then must be configured before going to one of the active modes. if the device is configured one can go directly from power down to the wanted active mode. note: ce and cs may not be high at the same time. setting one or the other decides whether configuration or active mode is entered.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 26 of 38 december 2004 configuration mode timing when one or more of the bits in the c onfiguration word needs to be changed the following timing apply. cs clk1 data ce pwr_up clk1 data cs msb ts ce th t = 0 td thmin tcs2data figure 14 timing diagram for configuration of nrf2401a if configuration mode is en tered from power down, cs can be set high after tpd2sby as shown in figure 12.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 27 of 38 december 2004 shockburst? mode timing shockburst? tx: cs clk1 data ce pwr_up clk1 data cs th tce2data ce td ant1/ant2 . t sby2txsb toa t = 0 t hmin ts figure 15 timing of shockburst? in tx the package length and the data rate give the delay toa (time on air), as shown in the equation. ) 1 (# / 1 + ? = databits datarate t oa
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 28 of 38 december 2004 shockburst? rx: figure 16 timing of shockburst? in rx the ce may be kept high during downloading of data, but the cost is higher current consumption (18ma) and the bene fit is short start-up time (200 s) when dr1 goes low. cs clk1/2 data/dout2 ce pwr_up clk1/2 data/ dout2 ce tdr2clk dr1/2 td ant1/ant2 . tsby2rx tclk2data dr1/2 t = 0 t hmin td
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 29 of 38 december 2004 direct mode direct mode tx: cs clk1 data ce pwr_up td ant1/ant2 t sby2txdm toadm tfd t = 0 figure 17 timing of direct mode tx in tx direct mode the input data will be sampled by nrf2401a and therefore no clock is needed. the clock must be stable at low level during transmission due to noise considerations. the exact delay t sby2txdm is given by the equation: us f us t xo txdm sby 25 . 2 14 / 1 194 2 + ? + = the maximum length of a package (toadm) over all voltages and temperatures is 4ms. this is limited by frequency drift in the transmitter and is independent of data rate and frequency channel.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 30 of 38 december 2004 direct mode rx: cs clk1/2 data/dout2 ce pwr_up td ant1/ant2 tsby2rx clk1/2 data/dout2 ce tsdm t = 0 t hdm t ldm figure 18 timing of direct mode rx tsby2rx describes the delay from the positive edge of ce to start detection of (demodulating) incoming data.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 31 of 38 december 2004 peripheral rf information antenna output the ant1 & ant2 output pins provide a balanced rf output to the antenna. the pins must have a dc path to vdd, either vi a a rf choke or via the center point in a dipole antenna. the load impedance seen between the ant1/ant2 outputs should be in the range 200-700 ? . a load of 100 ? +j175 ? is recommended for maximum output power (0dbm). lower load impedance (for instance 50 ? ) can be obtained by fitting a simple matching network. output power adjustment power setting bits of configuring word rf output power dc current consumption 11 0 dbm 3db 13.0 ma 10 -5 dbm 3db 10.5 ma 01 -10 dbm 3db 9.4 ma 00 -20 dbm 3db 8.8 ma conditions: vdd = 3.0v, vss = 0v, t a = 27oc, load impedance = 100 ? +j175 ? . table 20 rf output power setting for the nrf2401a. crystal specification tolerance includes initially accuracy and tolerance over temperature and aging. frequency c l esr c 0max tolerance 4 12pf 150 ? 7.0pf 30ppm 8 12pf 100 ? 7.0pf 30ppm 12 12pf 100 ? 7.0pf 30ppm 16 12pf 100 ? 7.0pf 30ppm 20 12pf 100 ? 7.0pf 30ppm table 21 crystal specification of the nrf2401a to achieve a crystal oscillator solution with low power consumption and fast start-up time, it is recommended to specify the crystal with a low value of crystal load capacitance. specifying c l =12pf is ok, but it is possible to use up to 16pf. specifying a lower value of crystal parallel equivalent capacitance, c 0 will also work, but this can increase the price of the crystal itself. typically c 0 =1.5pf at a crystal specified for c 0max =7.0pf.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 32 of 38 december 2004 sharing crystal with micro controller. when using a micro controller to drive the crystal reference input xc1 of the nrf2401a transceiver some rules must be followed. crystal parameters: when the micro controller drives the nrf 2401a clock input, the requirement of load capacitance c l is set by the micro controller only. the frequency accuracy of 30 ppm is still required to get a functional radio link. the nrf2401a will load the crystal by 0.5pf at xc1 in addition to the pbc routing. input crystal amplitude & current consumption the input signal should not have amplitudes exceeding any rail voltage, but any dc- voltage within this is ok. exceeding rail vo ltage will excite the esd structure and the radio performance is degraded below speci fication. if testing the nrf2401a with a rf source with no dc offset as the refere nce source, the input signal will go below the ground level, which is not acceptable. xc1 xo_out amplitude controlled current source buffer: sine to full swing current starved inverter: xosc core xc2 vdd vss vdd vss esd esd figure 19 principle of crystal oscillator it is recommended to use a dc-block before the xc1 pin so that the internal esd structures will self bias the xc1 voltage . the nrf2401a crystal oscillator is amplitude regulated. to achieve low current consumption and also good signal-to-noise ratio, it is recommended to use an input signal larger than 0.4 v-peak. the needed input swing is independent of the crystal
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 33 of 38 december 2004 frequency. when clocking the nrf2401a extern ally, xc2 is not used and can be left as an open pin. frequency reference mcu in direct mode there is a requirement on the accuracy of the data rate. for the receiver to detect the incoming data and recover the clock, the data rate must be within 200ppm, given that the data is "random", i.e. there is a statistical calculation on how often a preamble like sequence is present in the data. the clock is synchronized for any preamble detection, be it a dedicated pr eamble or part of the data stream. pcb layout and de-coupling guidelines a well-designed pcb is necessary to achieve good rf performance. keep in mind that a poor layout may lead to loss of performance, or even functionality, if due care is not taken. a fully qualified rf-layout for the nrf2401a and its surrounding components, including matching networks, can be downloaded from www.nordicsemi.no . a pcb with a minimum of two layers including a ground plane is recommended for optimum performance. the nrf2401a dc s upply voltage should be de-coupled as close as possible to the vdd pins with hi gh performance rf capacitors, see table 22. it is preferable to mount a large surface mount capacitor (e.g. 4.7 f tantalum) in parallel with the smaller value capacitors. the nrf2401a supply voltage should be filtered and routed separately from the supply voltages of any digital circuitry. long power supply lines on the pcb should be avoided. all device grounds, vdd connections and vdd bypass capacitors must be connected as close as possible to the nrf2401a ic. for a pcb with a topside rf ground plane, the vss pins should be connected directly to the ground plane. for a pcb with a bottom ground plane, the best technique is to have vi a holes as close as possible to the vss pads. one via hole should be used for each vss pin. full swing digital data or cont rol signals should not be routed close to the crystal or the power supply lines.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 34 of 38 december 2004 application example nrf2401a with single e nded matching network ce 1 vdd 24 vss 18 vdd 17 vss_pa 16 dr2 2 clk2 3 dout2 4 cs 5 dr1 6 clk1 7 data 8 dvdd 9 vss 10 xc2 11 xc1 12 ant2 15 ant1 14 vdd_pa 13 iref 19 vss 20 vdd 21 vss 22 pwr_up 23 nrf2401 u1 nrf2401 qfn24/5x5 c2 22pf l1 3.3nh l2 10nh c8 1.0pf c9 1.0pf c5 1nf c6 10nf r2 22k c4 2.2nf xxx xxx xxx c1 22pf r1 1m x1 16 mhz c3 4.7pf c7 33nf rf i/o pwr_up ce dr2 clk2 dout2 cs dr1 clk1 data vdd c10 2.2pf l3 5.6nh l4 5.6nh c11 4.7pf xxx figure 20 nrf2401a schematic for rf layouts with single end 50 ? antenna component description size value toleranc e units c1 capacitor ceramic, 50v, npo 0603 22 5% pf c2 capacitor ceramic, 50v, npo 0603 22 5% pf c3 capacitor ceramic, 50v, npo 0603 4.7 5% pf c4 capacitor ceramic, 50v, x7r 0603 2.2 10% nf c5 capacitor ceramic, 50v, x7r 0603 1.0 10% nf c6 capacitor ceramic, 50v, x7r 0603 10 10% nf c7 capacitor ceramic, 50v, x7r 0603 33 10% nf r1 resistor 0603 1.0 1% m ? r2 resistor 0603 22 1% k ? u1 nrf2401a transceiver qfn24 / 5x5 nrf2401a x1 crystal, cl = 12pf, esr < 100 ohm lxwxh = 4.0x2.5x0.8 16 1) +/- 30 ppm mhz l1 inductor, wire wound 2) 0603 3.3 5% nh l2 inductor, wire wound 2) 0603 10 5% nh l3 inductor, wire wound 2) 0603 5.6 5% nh l4 inductor, wire wound 2) 0603 5.6 5% nh c8 ceramic capacitor, 50v, np0 0603 1.0 0.1 pf pf c9 ceramic capacitor, 50v, np0 0603 1.0 0.1 pf pf c10 ceramic capacitor, 50v, np0 0603 2.2 0.25 pf pf c11 ceramic capacitor, 50v, np0 0603 4.7 0.25 pf pf table 22 recommended components (bom) in nrf2401a with antenna matching network 1) nrf2401a can operate at several crystal frequencies, please refer to page 31. 2) wire wound inductors are recommended, other can be used if their self-resonant frequency (sfr) is > 2.7 ghz
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 35 of 38 december 2004 pcb layout example figure 21 shows a pcb layout example for the application schematic in figure 20. a double-sided fr-4 board of 1.6mm thickness is used. this pcb has a ground plane on the bottom layer. additionally, there are ground areas on the component side of the board to ensure sufficient grounding of critical components. a large number of via holes connect the top layer ground areas to the bottom layer ground plane. top silk screen no components in bottom layer top view bottom view figure 21 nrf2401a rf layout with single ended connection to 50 ? antenna and 0603 size passive components
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 36 of 38 december 2004 definitions data sheet status objective product specification this data sheet contains target specifications for product development. preliminary product specification this data sheet contains preliminary data; supplementary data may be published from nordic semiconductor asa later. product specification this data sheet contains final product specifications. nordic semiconductor asa reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. limiting values stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the specifications sections of th e specification is not implied. exposure to limiting values for extended periods may affect device reliability. application information where application information is given, it is advisory and does not form part of the specification. table 23. definitions nordic semiconductor asa reserves the righ t to make changes without further notice to the product to improve reliability, function or design. nordic semiconductor asa does not assume any liability arising out of the application or use of any product or circuits described herein. life support applications these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasona bly be expected to result in personal injury. nordic semiconductor asa customer s using or selling these products for use in such applications do so at their own risk and agree to fully indemnify nordic semiconductor asa for any damages resulting from such improper use or sale. product specification: re vision date: 23.12.2004. data sheet order code: 23 1204-nrf2401a or 231204-nrf2401ag all rights reserved ?. reproduction in whole or in part is prohibited without the prior written permission of the copyright holder.
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 37 of 38 december 2004 your notes
product specification nrf2401a single chip 2.4 ghz radio transceiver nordic semiconductor asa - vestre rosten 81, n-7075 tiller, norway - phone +4772898900 - fax +4772898989 revision: 1.0 page 38 of 38 december 2004 nordic semiconductor asa ? world wide distributors for your nearest dealer, please see http://www.nordicsemi.no main office: vestre rosten 81, n-7075 tiller, norway phone: +47 72 89 89 00, fax: +47 72 89 89 89 visit the nordic semiconductor asa website at http://www.nordicsemi.no

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