STAR-Module Plus 910 Preliminary Rev 1.3 Integration Guide Author: Luciano Ruggiero Pier Giorgio Peruzzi StarModulePlus910_1_3.d Revision: 1.
SmallSTAR-Module 910 Document History Rev 1.3 FW Rev 1.2 FW Rev 1.1 FW Rev 1.0 FW release 119 : New Radio Low Cost Plus version added release 118: Ddttl improvement, TX routine without byte stuffing release 117R: Calibration address bug fixed, CD improvement release 116F Introduction………………………………………………………………………………….2 Pinout………………………………………………………………………………………….3 Electrical characteristics……………………………….……………………………………3 RF chracteristics…..
SmallSTAR-Module 910 Pinout IDLE/RX HIGH LOW Numbe r Direction Description J1 - RF CONNECTOR 1 - GROUND 2 Input TX_DATA 3 Output CD# (active low) 4 Output RX_DATA 5 - not connected 6 - GROUND 7 - Vdc (3.1 to 5.5 V) 8 Input IDLE 9 Input RESET_ 10 - GROUND Function Sleep Rx mode Receive data on TX_DATA, CD# asserted means RF channel is busy Electrical characteristics Description TX mode current RX mode current IDLE mode current @ 3.
SmallSTAR-Module 910 Block diagram Blocks description: • Reset supervisor: the microcontroller is reset when power supply falls below 3V • 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.
SmallSTAR-Module 910 Basic module states Different states explanation: • • • • IDLE: this state is entered when pin IDLE is set High. Power consumption is lowered to less than 100 uA. In idle state the radio module is unable to receive or transmit data packets. TX: RF power amplifier is active. This state can be entered from RX mode, sending to the module a formatted TX packet. Tx mode can’t be hold active more than the maximum data packet (about 20 mS). RX:receiver is active.
SmallSTAR-Module 910 Absence of RF: high level. Presence of RF: low level. The RF down conversion starts with the reception of the 0xB2 (old protocol) or 0x96 (new protocol) byte, followed by the packet length byte. According to this value the conversion goes on receiving length number bytes plus the two CRCs.
SmallSTAR-Module 910 The module returns in RX state after transmitting all the bytes of the packet. Fig. 2 IDLE mode In order to maximize battery duration on portable devices a low-consumption state is used. In this state with IDLE/RX_ pin asserted, all hardware blocks swith to power-down mode or switched off. To wake up the module, the host must deasserted IDLE/RX pin (Set RTS). In IDLE mode CD# has low level (shown in fig. 3). Fig.
SmallSTAR-Module 910 RF interface StarModulePlus910 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.
