Datalogic S r l 0021 Star Module PLUS Small 910MHz User Manual StarModulePlus910 1 2

Datalogic ADC S.r.l. Star Module PLUS Small 910MHz StarModulePlus910 1 2

User Manual

StarModulePlus910_1_2.doc Revision: 1.2 22/12/2010 Confidential page 1 of 1 DATALOGIC PROPRIETARY INFORMATIONS STAR-Module Plus 910 MHz Preliminary Rev 1.1 Integration Guide Author: Pier Giorgio Peruzzi
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 2 of 2 DATALOGIC PROPRIETARY INFORMATIONS Document History Rev 1.1 FW release 1.35 Introduction………………………………………………………………………………….2 Pinout………………………………………………………………………………………….3 Electrical characteristics……………………………….……………………………………3 RF chracteristics…..…………………………………………………………………………4 Timings…………………………………………………………………………………………4 Block diagram…………………………………………………………………………………4 Basic module states………………………………………………………………………….5 Regulatory : This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 1) This device may not cause harmful interference, and 2) This device must accept any interference received, including interference that may cause undesired operation. Any change or modification to the product not expressly approved by Datalogic Scanning Group S.r.l. could void the user' s authority to operate the device. This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 3 of 3 DATALOGIC PROPRIETARY INFORMATIONS Introduction The STAR-Module Plus 910 is an FSK RF half-duplex transceiver working at 910 MHz. Its main features are: • FSK Frequency Shift Keying Modulation • Default RF baud rate 36864 bps Manchester encoded • UART baud rate : 38400 8 n 1 bps • Extended 5.5 to 3.1 V power supply • Temperature range –20°C / +55°C • High RF frequencies precision, due to utilization of a PLL synthesizer • Factory calibration parameters saved on write protected flash block • Factory pre-loaded unique 32 bit mac address for each module • RF front-end with SAW filter for high out-of-band noise rejection and low spurius level emission • On-board temperature sensor for frequency drift compensation. • Bootloader for in circuit firmware upgrade • Sub-milliampere sleep mode • On-board EEPROM for configuration parameters
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 4 of 4 DATALOGIC PROPRIETARY INFORMATIONS IDLE Function HIGH Sleep Mode LOW Rx mode – Data received sent on TX_DATA, CD# asserted means RF channel is busy Electrical characteristics Description @ 3.3 V @ 5 Unit TX mode current 18 31 mA RX mode current 16 21 mA IDLE mode current 32 52 uA RF characteristics Description Typ Unit TX/RX center frequency 910 MHz FSK modulation frequency deviation +/-100 kHz RX bandwidth 500 kHz Output power (50 Ohm load, typ ) -1.0 dBm RX Sensitivity (PER < 10% @36864 baud) -95 dBm CD# threshold -80 dBm CD# threshold hysteresys 10 dBm RF in/out impedance 50 Ohm Frequency drift from –25 to +55°C +/- 50 ppm RF CONNECTOR - J1 GROUND - 9 RESET_ Input 8 Vdc (3.1 to 5.5 V) - 7 GROUND - 6 RX_DATA Input 5 TX_DATA Output 4 IDLE Input 3 CD# (active low) Output 2 GROUND - 1 Description Direction Pin
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 5 of 5 DATALOGIC PROPRIETARY INFORMATIONS Block diagram Blocks description: • Reset supervisor: the microcontroller is reset when power supply falls below 3.0 V • Temperature sensor: 10kOhm NTC • Microcontroller: Atmel ATMega8L with RISC AVR core, 8kB Flash, 1kB SRAM, 512 B EEPROM, ADC, UART, I2C controller, 8MHz internal clock oscillator • RF Transceiver: Infineon TDA5252 with PLL synthesizer (reference oscillator 18.958333MHz) • Analog RX baseband circuitry: processing of analog signal from transceiver demodulator to uC ADC • RF Front End: SAW filter, PIN-diode based RX-TX switch Basic module states
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 6 of 6 DATALOGIC PROPRIETARY INFORMATIONS RF interface StarModuleSLC910 has 50 Ohm impedance on RF out in TX and RX mode, therefore impedance matching is required for antenna system of host. Care must be taken for the proximity of conductive materials or the user’s hand that will cause a mismatch of the antenna, decreasing the transceiver RF characteristics. Moreover, care must be taken to ensure that the host system doesn’t have spurious emissions in the range 910MHz+/-200kHz, that could cripple receiver sensitivity: it is advised to put a ground plane under the RF module and to filter the power supply. Noisy parts, like system buses, must be shielded in order not to irradiate spurious fields.
SmallSTAR-Module 910 StarModulePlus910_1_2.doc Preliminary Confidential page 7 of 7 DATALOGIC PROPRIETARY INFORMATIONS Integration Examples

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