Index > Product > Sub 1GHz Short Range Devices > A7149
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General Description
A7149 is a monolithic low-IF architecture CMOS FSK/GFSK TRX for wireless applications in the 433/470/868/ 915MHz ISM bands. This device is especially suitable for battery-powered application and the 470MHz ~ 510MHz wireless AMR (Auto Meter Reading) in China and 868.3MHz wireless M-bus in Europe.

A7149 is one of AMICCOM’s Mini Power Consumption Family in sub 1GHz ISM band product line. A7149 is integrated with DC-DC convertor to optimize for very low power consumption

A7149 incorporates a baseband modem with the programmable data rate divider from 2K to 250Kbps. For a battery powered system, A7149 supports fast PLL settling time, Xtal settling time and on-chip Regulator settling time to reduce average power consumption.

A7149’s control registers are accessed via 3-wire or 4-wire SPI interface including TX/RF FIFO, VCO frequency, to chip calibration procedures. Another one, via SPI as well, is the unique Strobe command, A7149 can be controlled from power saving mode (deep sleep, sleep, idle, standby), PLL mode, TX mode and RX mode. In addition to SPI, the digital connections between A7149 and MCU are GIO1 and GIO2 (multi-function GPIO) to indicate A7149’s status so that MCU could use either polling or interrupt for radio control.

For packet handling, A7149 supports direct mode and FIFO mode. In direct mode, MCU or Encoder shall deliver the defined packet (preamble + sync word + payload) to GIO1 or GIO2/TXD pin. Then, in RX mode, MCU or Decoder can receive the coming packet (preamble + sync word + payload) in bit sequence from GIO1 or GIO2/RXD pin.

In FIFO mode, preamble is self-generated by A7149. User just needs to assign the sync word to this device by ID R/W command via SPI. For payload, the built-in separated 64-bytes TX/RX FIFO are used to be this purpose to let user R/W the wanted payload. User can also enable additional packet features like CRC for error detection, FEC (hamming 7 by 4) for 1-bit data correction per code word, Manchester coding, as well as data whitening for data encryption / decryption.

Additional device features such as on-chip regulator, RSSI for clear channel assessment, a thermal sensor, low battery detector, carrier detect, preamble detect, frame sync in FIFO mode, auto-ack and auto-resend, AIF (Auto IF function), AFC (Auto Frequency compensation), Auto calibration (VCO, IF Filter), PLL/CLK Generator, on-chip compensated capacitors of Xtal loading, and WOR (Wake on RX) to support the ability to periodically wake up from sleep mode to RX mode and listen for incoming packets without MCU interaction, can be used to simplify system development and cost. Overall, A7149’s highly integrated features and low current consumption offer a reduced BOM cost for a high performance ISM bands product. All features are integrated in a small QFN 5X5 32 pins package.
 Frequency band: 433/470/510/868/915MHz.
 FSK and GFSK modulation.
 High RX sensitivity, i.e. for 433MHz.
 -119.5dBm at 2Kbps on-air data rate.
 -112dBm at 50Kbps on-air data rate.
 -108.5dBm at 100Kbps on-air data rate.
 Programmable data rate from 2Kbps to 250Kbps.
 Fast PLL settling time
 Supports low cost crystal (12.8/16/19.2MHz).
 Programmable IF filter bandwidth (50KHz/100KHz/150KHz/250KHz).
 Easy to use
 Support 3-wire or 4-wire SPI.
 Unique Strobe command via SPI.
 AGC ON with 9-bits RSSI.
 AGC OFF with 8-bits RSSI.
 Auto Calibrations (VCO, IF Filter, RSSI).
 Auto IF function.
 Auto Frequency Compensation.
 Auto CRC Filtering.
 Auto FEC by (7, 4) Hamming code (1 bit error correction / code word).
 Auto-resend (max 15 cycles).
 Auto-acknowledgement.
 Manchester encoding.
 Programmable carrier sense indicator.
 Data Whitening for payload encryption and decryption.
 Separated 64 bytes RX and TX FIFO.
 Easy FIFO / Segment FIFO / FIFO Extension (16K bytes to infinite).
 Support FIFO mode with frame sync to MCU.
 Support direct mode with recovery clock output to MCU.
 ISM Band Data Communication
 Wireless Remote Controller
 RKE (Remote Keyless Entry)
 BuildingAutomation
 Home Security
 Wireless Sensor Networking
 Energy Control and Management
 AMR (Auto Metering Reading)