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
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DATALOGIC PROPRIETARY INFORMATIONS
STAR-Module Plus 910 MHz
Preliminary
Rev 1.1
Integration Guide
Author:
Pier Giorgio Peruzzi
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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.
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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
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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
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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
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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.
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DATALOGIC PROPRIETARY INFORMATIONS
Integration Examples