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ATR2434 Datasheet(PDF) 5 Page - ATMEL Corporation |
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ATR2434 Datasheet(HTML) 5 Page - ATMEL Corporation |
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5 / 35 page  5 ATR2434 [Preliminary] 4822C–ISM–09/04 32 Chips/Bit Dual Channel The baseband supports two non-simultaneous data streams each operating at 31.25 kbits/s. 32 Chips/Bit Single Channel 2 × Oversampled The baseband supports a single data stream operating at 31.25 kbits/s that is sampled twice as much as the other modes. The advantage of selecting this mode is its ability to tolerate a noisy environment. 32 Chips/Bit Single Channel Dual Data Rate (DDR) The baseband spreads bits in pairs and supports a single data stream operating at 62.5 kbits/s. Serializer/Deserializer (SERDES) The ATR2434 provides a data Serializer/Deserializer (SERDES), which provides byte-level framing of transmit and receive data. Bytes for transmission are loaded into the SERDES and receive bytes are read from the SERDES via the SPI interface. The SERDES provides double buffering of transmit and receive data. While one byte is being transmitted by the radio the next byte can be written to the SERDES data register insuring there are no breaks in transmitted data. After a receive byte has been received it is loaded into the SERDES data register and can be read at any time until the next byte is received, at which time the old contents of the SERDES data register will be overwritten. Application Interfaces The ATR2434 has a fully synchronous SPI slave interface for connectivity to the applica- tion MCU. Configuration and byte-oriented data transfer can be performed over this interface. An interrupt is provided to trigger real time events. An optional SERDES Bypass mode (DIO) is provided for applications that require a syn- chronous serial bit-oriented data path. This interface is for data only. Clocking and Power Management A 13-MHz crystal is directly connected to X13IN and X13 without the need for external capacitors. The ATR2434 has a programmable trim capability for adjusting the on-chip load capacitance supplied to the crystal. The Radio Frequency (RF) circuitry has on- chip decoupling capacitors. The ATR2434 is powered from a 2.7 V to 3.6 V DC supply. The ATR2434 can be shutdown to a fully static state using the PD pin. Below are the requirements for the crystal to be directly connected to X13IN and X13: • Nominal frequency: 13 MHz • Operating mode: fundamental mode • Resonance mode: parallel resonant • Frequency stability: ±30 ppm • Series resistance: ≤ 100 Ω • Load capacitance: 10 pF • Drive level: 10 µW to 100 µW |
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Similar Description - ATR2434 |
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