ADuC7122 Precision Analog Microcontroller

By Analog Devices Inc 14

ADuC7122 Precision Analog Microcontroller

Analog Devices' ADuC7122 is a fully integrated, 1 MSPS, 12-bit data acquisition system, incorporating high performance multi-channel ADCs, 12 voltage output DACs, 16-bit/32-bit MCUs, and Flash/EE memory on a single chip. The ADC consists of up to 13 inputs. Four of these inputs can be configured as differential pairs with a programmable gain amplifier on their front end providing a gain between 1 and 5. The ADC can operate in single-ended or differential input modes. The ADC input voltage is 0 V to VREF. A low drift band gap reference, temperature sensor, and supply voltage monitor complete the ADC peripheral set.

The DAC output range is programmable to one of two voltage ranges. The DAC outputs have an enhanced feature of being able to retain their output voltage during a watchdog or software reset sequence.

The devices operate from an on-chip oscillator and a PLL, generating an internal high frequency clock of 41.78 MHz. This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The microcontroller core is an ARM7TDMI®, 16-bit/32-bit RISC machine that offers up to 41 MIPS peak performance. 8 kilobytes of SRAM and 126 kilobytes of nonvolatile Flash/EE memory are provided on chip. The ARM7TDMI core views all memory and registers as a single linear array.

The ADuC7122 contains an advanced interrupt controller. The vectored interrupt controller (VIC) allows every interrupt to be assigned a priority level. It also supports nested interrupts to a maximum level of eight per IRQ and FIQ. When IRQ and FIQ interrupt sources are combined, a total of 16 nested interrupt levels are supported.

For communication purposes, the part contains 2 × I2C channels that can be individually configured for master or slave mode. An SPI interface supporting both master and slave modes is also provided.

    Analog I/O
  • 13 external channels, 12-bit, 1 MSPS ADC
    • 2 channels with programmable gain
    • PGA (1 to 5) input range
    • IOVDD power monitor channel
    • On-chip temperature monitor
    • 11 general-purpose inputs
  • Fully differential and single-ended modes
  • 0 V to VREF analog input range
  • 12 × 12-bit voltage output DACs
  • On-chip voltage reference: 1.2 V/2.5 V
    • Buffered output reference sources for use with external circuits
  • ARM7TDMI core, 16-bit/32-bit RISC architecture
  • JTAG port supports code download and debug
    Clocking Options
  • Trimmed on-chip oscillator (±3%)
  • External watch crystal
  • External clock source up to 41.78 MHz
  • 41.78 MHz PLL with programmable divider
  • 126 kB Flash/EE memory, 8 kB SRAM
  • In-circuit download, JTAG-based debug
  • Software-triggered in-circuit reprogrammability
    On-Chip Peripherals
  • UART, 2 × I2C and SPI serial I/O
  • 32-pin GPIO port
  • 4× general-purpose timers
  • Wake-up and watchdog timers (WDT)
  • Power supply monitor
    Vectored interrupt controller for FIQ and IRQ
  • 8 Priority levels for each interrupt type
  • Interrupt on edge or level external pin inputs
  • Specified for 3 V operation
  • Active mode: 11 mA at 5 MHz, 40 mA at 41.78 MHz
    Package and Temperature Range
  • 7 mm × 7 mm 108-ball BGA
  • Fully specified for −10°C to +95°C operation
  • Low-cost QuickStart™ development system
  • Full third-party support

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