ADUCM360BCPZ128-R7

The ADuCM360 is a fully integrated 3.9 kSPS, 24-bit data acquisition system incorporating dual high-performance multichannel Σ-Δ ADCs, a 32-bit ARM Cortex™-M3 processor, and Flash/EE memory on a single chip. The ADuCM360 is designed for direct connection to external precision sensors in wired and battery-powered applications. The ADuCM361 integrates all the features of the ADuCM360, but with only a single 24-bit Σ-Δ ADC (ADC1).

The ADuCM360/ADuCM361 include an on-chip 32 kHz oscillator and an internal 16 MHz high-frequency oscillator. The high-frequency oscillator is routed through a programmable clock divider, which generates the processor core clock frequency. The maximum core clock speed is 16 MHz, with no restrictions based on operating voltage or temperature.

The microcontroller core is a low power ARM Cortex-M3 processor — a 32-bit RISC machine with peak performance up to 20 MIPS. The Cortex-M3 processor integrates a flexible 11-channel DMA controller supporting all wired communication peripherals (SPI, UART, and I2C). Also integrated on-chip are 128 kB of nonvolatile Flash/EE memory and 8 kB of SRAM.

The analog subsystem consists of a dual-channel ADC, each connected to a flexible input multiplexer. Both ADCs can operate in fully differential and single-ended modes. Additional on-chip ADC features include dual-channel programmable excitation current sources, a diagnostic current source, and a bias voltage generator at AVDD_REG/2 (900 mV) for setting the common-mode voltage of input channels. A low-side internal ground switch can disconnect external circuitry (such as bridge circuits) between conversions.

The ADC contains two parallel filters: a sinc3 or sinc4 filter in parallel with a sinc2 filter. The sinc3 or sinc4 filter is used for precision measurements. The sinc2 filter is used for fast measurements and step-change detection of input signals.

The device integrates a low noise, low drift internal bandgap voltage reference, but can be configured to accept one or two external voltage references in ratiometric measurement configurations. An option to buffer external reference voltage inputs is integrated on-chip. A single-channel buffered voltage output DAC is also integrated on-chip.

The ADuCM360/ADuCM361 integrate a range of on-chip peripherals that can be configured under microcontroller software control to suit application requirements. These peripherals include UART, I²C, and dual-channel SPI serial I/O communication controllers; a 19-pin GPIO port; two general-purpose timers; a wake-up timer; and a system watchdog timer. A 16-bit PWM controller with 6 output channels is also provided.

The ADuCM360/ADuCM361 are designed for battery-powered applications requiring low power operation. The microcontroller core can be configured for normal operating mode at 290 μA/MHz (including Flash/SRAM IpD). With both ADCs enabled (input buffers disabled), PGA gain of 4, one SPI port enabled, and all timers enabled, total system current consumption can reach 1 mA.

The ADuCM360/ADuCM361 can be configured via direct programming control into a number of low power operating modes, including a sleep mode (with internal wake-up timer active) in which power consumption is as low as 4 μA. In sleep mode, peripherals such as external interrupts or the internal wake-up timer can wake the device. This mode allows the device to operate at extremely low power while still responding to external asynchronous or periodic events.

On-chip factory firmware supports serial in-circuit download via a serial wire interface (2-pin JTAG system) and UART, as well as nonintrusive emulation via the serial wire interface. These features are all integrated into a low cost QuickStart™ development system supporting the precision analog microcontroller series.

These devices are powered by an external 1.8 V to 3.6 V supply and are rated for the −40°C to +125°C industrial temperature range.