NRF905 NORDIC SEMICONDUCTOR, NRF905 Datasheet
NRF905
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NRF905 Summary of contents
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... Low supply current (TX), typical 9mA @ -10dBm output power Low supply current (RX), typical 12.5mA GENERAL DESCRIPTION nRF905 is a single-chip radio transceiver for the 433/868/915 MHz ISM band. The transceiver consists of a fully integrated frequency synthesiser, receiver chain with demodulator, a power amplifier, a crystal oscillator and a modulator. The TM ShockBurst feature automatically handles preamble and CRC ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver ORDERING INFORMATION Type Number nRF905 IC nRF905-EVKIT 433 nRF905-EVKIT 868/915 Table 2 nRF905 ordering information. BLOCK DIAGRAM MISO (10) MOSI (11) SCK (12 addr. CSN (13 reg reg. Config-reg. TRX_CE (1) PWR_UP (2) TX_EN (32) CD (6) AM (7) DR (8) uPCLK (3) Figure 1 nRF905 with external components. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver TABLE OF CONTENTS 1 Pin Functions .................................................................................................................... 4 2 Pin Assignment................................................................................................................. 5 3 Electrical Specifications ................................................................................................... 6 4 Current Consumption........................................................................................................ 8 5 Modes of Operation .......................................................................................................... 9 5.1 Active Modes ........................................................................................................... 9 5.2 Power Saving Modes ............................................................................................... 9 5.3 nRF ShockBurst™ Mode......................................................................................... 9 TM 5.4 Typical ShockBurst TM 5 ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 1 PIN FUNCTIONS Pin Name Pin function 1 TRX_CE Digital input 2 PWR_UP Digital input 3 uPCLK Clock output 4 VDD Power 5 VSS Power 6 CD Digital output 7 AM Digital output 8 DR Digital output 9 VSS Power 10 MISO SPI - interface ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 2 PIN ASSIGNMENT Figure 2 nRF905 pin assignment (top view) for a 32L QFN 5x5 package. Main office: Nordic Semiconductor ASA Revision: 1.4 - Vestre Rosten 81, N-7075 Tiller, Norway Page Phone +4772898900 -Fax +4772898989 June 2006 ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 3 ELECTRICAL SPECIFICATIONS Conditions: VDD = +3V VSS = 0V, TEMP = -40ºC to +85ºC (typical +27ºC) Symbol Parameter (condition) Operating conditions VDD Supply voltage TEMP Operating temperature Digital input/output V HIGH level input voltage IH V LOW level input voltage ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 1) Max value determined by design and characterization testing. 2) Output frequency is 4MHz load of external clock pin is 5pF, Crystal is 4MHz. 3) Crystal is 4MHz. 4) Pin voltages are VSS or VDD. 5) Chip in power down, SPI_SCK frequency is 1MHz. 6) Operates in the 433, 868 and 915 MHz ISM band. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 4 CURRENT CONSUMPTION MODE CRYSTAL FREQ. [MHZ] Power Down Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby Standby ...
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... By allowing the digital part of the application to run at low speed, while maximizing the data rate on the RF link, the nRF905 ShockBurst™ mode reduces the average current consumption in applications. In ShockBurst (AM) and Data Ready (DR) notifies the MCU when a valid address and payload is received respectively ...
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... When TRX_CE is set low, the nRF905 finishes transmitting the outgoing packet and then sets itself into standby mode. If TX_EN is set low while TRX_CE is kept high, the nRF905 finishes transmitting the outgoing packet and then enter RX-mode in the channel already programmed in the RF-CONFIG register. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver Radio in Standby TX_EN = HI PWR_UP = HI TRX_CE = LO SPI - programming uController loading ADDR and PAYLOAD data (Configuration register if changes since last TX/RX) TRX_CE YES Transmitter is powered up nRF ShockBurst set low Generate CRC and preamble after pre- ...
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... When all payload data is retrieved, nRF905 sets Data Ready (DR) and Address Match (AM) low again. 9. The chip is now ready for entering ShockBurst power down mode. If TX_EN is set high while TRX_CE is kept high, the nRF905 would enter TM ShockBurst TX and start a transmission according to the present contents in the SPI- registers ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver Radio in Standby TX_EN = LO PWR_UP = HI NO TRX_CE = HI ? YES Receiver is powered up Receiver Sensing for incomming data CD is set high if carrier NO Correct ADDR? YES AM is set high Receiving data NO Correct AM is set low CRC? YES ...
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... Single Chip 433/868/915 MHz Radio Transceiver 5.6 Power Down Mode In power down the nRF905 is disabled with minimal current consumption, typically less than 2.5µA. When entering this mode the device is not active which will minimize average current consumption and maximizing battery lifetime. The configuration word content is maintained during power down ...
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... Single Chip 433/868/915 MHz Radio Transceiver 6 DEVICE CONFIGURATION All configuration of the nRF905 is via the SPI interface. The interface consists of five registers; a SPI instruction set is used to decide which operation shall be performed. The SPI interface can be activated in any mode however Nordic Semiconductor ASA recommends the chip be in standby or power down mode ...
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... STATUS REGISTER N.A. Table 7 Instruction set for the nRF905 SPI interface. A read or a write operation may operate on a single byte set of succeeding bytes from a given start address defined by the instruction. When accessing succeeding bytes one will read or write MSB of the byte with the smallest byte number first ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 6.3 SPI Timing The interface supports SPI mode 0. SPI operation and timing is given in Figure 6 to Figure 8 and in Table 8. The device must be in one of the power saving modes for the configuration registers to be read or written to. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver PARAMETER Data to SCK Setup SCK to Data Hold CSN to Data Valid SCK to Data Valid SCK Low Time SCK High Time SCK Frequency SCK Rise and Fall CSN to SCK Setup SCK to CSN Hold CSN Inactive time ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 6.4 RF – Configuration Register Description Parameter Bitwidth Description CH_NO 9 Sets center freq. together with HFREQ_PLL (default = 001101100 HFREQ_ 1 Sets PLL in 433 or 868/915 MHz mode (default = 0). PLL PA_PWR 2 Output power (default = 00). RX_RED_ 1 Reduces current in RX mode by 1.6mA. Sensitivity is reduced (default = 0). ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 6.5 Register Contents RF-CONFIG_REGISTER (R/W) Byte # Content bit[7:0], MSB = bit[ bit[7:6] not used, AUTO_RETRAN, RX_RED_PWR, PA_PWR[1:0], 2 bit[7] not used, TX_AFW[2:0] , bit[3] not used, RX_AFW[2:0] 3 bit[7:6] not used, RX_PW[5:0] 4 bit[7:6] not used, TX_PW[5:0] ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 7 IMPORTANT TIMING DATA The following timing must be obeyed during nRF905 operation. 7.1 Device Switching Times PWR_DWN STBY TX ShockBurst™ STBY RX ShockBurst™ RX ShockBurst™ TX ShockBurst™ Notes to table switching is available without re-programming of the RF configuration register ...
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... Address Match (AM) pins being reset to low. 7.4 Preamble In each data-packet transmitted by the nRF905 a preamble is added automatically. The preamble is a predefined bit-sequence used to adjust the receiver for optimal performance. A ten-bit sequence is used as preamble in nRF905. The length of the preamble then 200 s. preamble Main office: Nordic Semiconductor ASA Revision: 1 ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 7.5 Time On Air The time-on-air is the sum of the radio start-up time and the data-packet length. The length of the preamble, address field, payload and CRC-checksum give the data- packet length while the radio start-up time is given in Table 11. While preamble length and start-up time are fixed the user sets the other parameters in the RF- configuration register ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 8 PERIPHERAL RF INFORMATION 8.1 Crystal Specification Tolerance includes initially accuracy and tolerance over temperature and aging. Frequency C L 4MHz 8pF – 16pF 8MHz 8pF – 16pF 12MHz 8pF – 16pF 16MHz 8pF – 16pF 20MHz 8pF – ...
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... Table 13 RF output power setting for the nRF905. 8.6 Modulation The modulation of nRF905 is Gaussian Frequency Shift Keying (GFSK) with a data- rate of 100kbps. Deviation is 50kHz. GFSK modulation results in a more bandwidth effective transmission-link compared with ordinary FSK modulation. The data is internally Manchester encoded (TX) and Manchester decoded (RX). That is, the effective symbol-rate of the link is 50kbps ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 8.7 Output Frequency The operating RF-frequency of nRF905 is set in the configuration register by CH_NO and HFREQ_PLL. The operating frequency is given by 422 When HFREQ_PLL is ‘0’ the frequency resolution is 100kHz and when it is ‘1’ the resolution is 200kHz ...
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... 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 nRF905 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 place via holes as close as possible to the VSS pins ...
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... MCU software program ShockBurst TX, the Data Ready (DR) signal is set high when a complete packet is transmitted, telling the MCU that the nRF905 is ready for new actions reset to low at the start of a new packet transmission or when switched to a different mode i.e. receive mode or standby mode. TM ...
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... One way to increase system reliability in a noisy environment system without collision control is to transmit a packet several times. This is easily accomplished with the Auto Retransmit feature in nRF905. By setting the AUTO_RETRAN bit to “1” in the configuration register, the circuit keeps sending the same data packet as long as TRX_CE and TX_EN are high ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 10 PACKAGE OUTLINE nRF905 uses the QFN 32L 5x5 green package with a mat tin finish. Dimensions are in mm. Recommended soldering reflow profile can be found in application note nAN400-08, QFN soldering reflow guidelines, www.nordicsemi.no. + Package Type ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 10.1 Package marking Figure 12 nRF905 package marking layout Abbreviations: DDDDDD – Product number, e.g. 905 B Build Code, i.e. unique code for silicon revision, production site, package type and test platform X – "X" grade, i.e. Engineering Samples (optional) YY – ...
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... SPI_MISO SPI_MOSI SPI_SC K SPI_C SN C8 33pF 0603 Figure 13 nRF905 Application schematic, differential connection to a loop antenna (433MHz). Component C1 NP0 ceramic chip capacitor, (Crystal oscillator) C2 NP0 ceramic chip capacitor, (Crystal oscillator) C3 NP0 ceramic chip capacitor, (PA supply decoupling) C4 X7R ceramic chip capacitor, (PA supply decoupling) ...
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... There is no ground plane beneath the antenna. a) Top silk screen c) Top view Figure 14 PCB layout example for nRF905, differential connection to a loop antenna. A fully qualified RF-layout for the nRF905 and its surrounding components, including antennas and www ...
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... It is recommended to add pull up or pull down resistors on signals that can enter a floating state. For the nRF905 it is recommended to have pull up on the CSN signal and pull down on the MOSI and SCK signal. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver Component C1 NP0 ceramic chip capacitor, (Crystal oscillator) C2 NP0 ceramic chip capacitor, (Crystal oscillator) C3 NP0 ceramic chip capacitor, (PA supply decoupling) @ 433MHz @ 868MHz @ 915MHz C4 X7R ceramic chip capacitor, (PA supply decoupling) C5 NP0 ceramic chip capacitor, (Supply decoupling) ...
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... Top silk screen c) Top view Figure 17 PCB layout example for 433MHz operation nRF905, single ended connection to 50 antenna by using a differential to single ended matching network. Main office: Nordic Semiconductor ASA Revision: 1 ...
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... Single Chip 433/868/915 MHz Radio Transceiver a) Top silk screen c) Top view Figure 18 PCB layout example for 868-915MHz operation nRF905, single ended connection to 50 antenna by using a differential to single ended matching network. A fully qualified RF-layout for the nRF905 and its surrounding components, including antennas and www.nordicsemi.no. ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 12 ABSOLUTE MAXIMUM RATINGS Supply Voltages VDD.............................. - 0. 3.6V VSS .....................................................0V Input Voltage V ..........................- 0.3V to VDD + 0.3V I Output Voltage V .........................- 0.3V to VDD + 0.3V O Total Power Dissipation P (T =85 C) ................................ 200mW D A Temperatures Operating temperature ........................................... - Storage temperature .............................................. - 125 C Note: Stress exceeding one or more of the limiting values may cause permanent damage to the device ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 13 GLOSSARY OF TERMS Term ADC AM CD CLK CRC DR GFSK ISM kSPS MCU PWR_DWN PWR_UP RX SPI CSN MISO MOSI SCK SPS STBY TRX_EN TX TX_EN Main office: Nordic Semiconductor ASA Revision: 1.4 Description Analog to Digital Converter ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver 14 DEFINITIONS Product Specification Identification Objective Product Specification Preliminary Product Specification Product Specification Obsolete Product Specification Table 18 Product status definitions Nordic Semiconductor ASA reserves the right to make changes without further notice to the product to improve reliability, function or design. Nordic Semiconductor does not assume any liability arising out of the application or use of any product or circuits described herein ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver YOUR NOTES Main office: Nordic Semiconductor ASA Revision: 1.4 - Vestre Rosten 81, N-7075 Tiller, Norway Page Phone +4772898900 -Fax +4772898989 June 2006 ...
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... PRODUCT SPECIFICATION nRF905 Single Chip 433/868/915 MHz Radio Transceiver Nordic Semiconductor ASA – World Wide Distributors For Your nearest dealer, please see http://www.nordicsemi.no Vestre Rosten 81, N-7075 Tiller, Norway Phone: + 00, Fax: + Visit the Nordic Semiconductor ASA website at http://www.nordicsemi.no Main office: Nordic Semiconductor ASA Revision: 1 ...