High Performance, Low Power, System-on-Chip, Enhanced Digital Audio Interface

The EP7309 is designed for ultra-low power applications such as digital music players, internet appliances, smart cellular phones, or any hand-held device that features the added capability of digital audio decompression. The core-logic functionality of the device is built around an ARM720T processor with 8 KB of four-way set-associative unified cache and a write buffer. Incorporated into the ARM720T is an enhanced memory management unit (MMU) which allows for support of sophisticated operating systems like Microsoft Windows CE and Linux.

The EP7309 is designed for ultra-low power operation. Its core operates at only 2.5V, while its I/O has an operation range of 2.5 to 3.3V. The device has three basic power states: operating, idle, and standby.

The EP7309 integrates an interface to enable a direct connection to many low cost, low power, high quality audio converters. In particular, the DAI can directly interface with the CS43L41/42/43 low-power audio D/A converters and the CS53L32 low-power A/D converter.

Adding only desired memory and peripherals to the highly integrated EP7309 completes a low-power system solution. All necessary interface logic is integrated on-chip.

• ARM7TDMI processor & MMU supporting Thumb mode
  • 8 KB of four-way set-associative cache
• Supports MP3, WMA, AAC, ADPCM, Audible, etc.
• 48 KB of on-chip SRAM
• 32-bit unique MaverickKey ID for SDMI compliance
• Dynamic clock speeds of 18, 36, 49, and 74 MHz
• LCD controller, Interrupt controller, and Boot ROM
• IrDA, PWW (2), and 16550 UART (2) interfaces
• Real-time clock and two general purpose 16-bit timers
• Integrated peripheral interfaces
  • 8/32/16-bit SRAM/FLASH/ROM interface
  • Glueless digital audio plus CODEC interface
  • Two synchronous serial interfaces (SSI1, SSI2)
  • 8x8 keypad scanner & dedicated LED flasher (via RTC)
  • 27 general purpose input/output pins
• Ultra-low power
  • 90 mW at 74 MHz typical; 30 mW at 18 MHz typical
  • 10 mW in the Idle State; <1 mW in the Standby state
• Package: 208-pin LQFP, 256-ball PBGA, or 204-ball TFBGA