A9 GSM Core Board

Board Features

• 1 A9 module
• Raspberry Pi compatible GPIOs pins
• download debug pins (HST_TX,HST_RX)
• USB serial interface for AT-commands and Python REPL
• One SIM card slot (Nano Card <Micro Card <Standard Card)
• 1 GPRS interface with IPEX 1 generation package
• 5v-4.2V DC-DC, it can be 5v power supply or 3.8 ~ 4.2V power supply
• 1 reset button
• 1 microphone
• 1 speaker

A9 Specification

• RDA 32 bit RISC core, frequency up to 312MHz, with 4k instruction cache, 4k data cache
• Up to 29 GPIOs (with two download pins)
• Calendar (Real Time Clock) with alarm
• 1 USB1.1 device interface
• 2 UART interface with flow control (+1 download/debug serial port)
• 2 SPI interface
• 3 I 2 C interface
• 1 SDMMC controller (interface)
• 2 ADC interface, 10 bits
• 32Mb (4MB) SPI NOR Flash
• 32Mb (4MB) DDR PSRAM
• 8kHz, 13Bits/sample ADC mic
• 48kHz, 16bits/sample DAC Audio
• Power Management Unit: Lithium battery charge management, integrated DC-DC and LDOs, variable IO voltage
• 18.8 x 19.2 mm SMD package
• Quad-band GSM/GPRS (800/900/1800 / 1900MHz)
• calls
• SMS service