ADUCM360

Part: ADuCM360/ADuCM361 — Analog Devices

Type: Low Power, Precision Analog Microcontroller with Dual Sigma-Delta ADCs, ARM Cortex-M3

Description: A fully integrated, 3.9 kSPS, 24-bit data acquisition system incorporating dual high-performance, multichannel sigma-delta ADCs (ADuCM360, single ADC for ADuCM361), a 32-bit ARM Cortex-M3 processor, and 128 kB Flash/EE memory with 8 kB SRAM on a single chip, designed for direct interfacing to external precision sensors.

Operating Conditions:

• Supply voltage: 1.8 V to 3.6 V
• Operating temperature: -40°C to +125°C
• Max core clock speed: 16 MHz

Absolute Maximum Ratings:

• Max supply voltage: 3.6 V (from operating conditions, not explicit abs max table)
• Max continuous current: 20 mA (ground switch)

Key Specs:

• ADC Resolution: 24 Bits (No Missing Codes, Chop off, fADC ≤ 500 Hz)
• ADC Conversion Rate: 3.5 Hz to 3906 Hz (Chop off)
• RMS Noise: 52 nV at 3.53 Hz, 200 nV at 50 Hz
• Internal Voltage Reference: 1.2 V (Typ)
• DAC Resolution: 12 Bits (Voltage Output)
• Excitation Current Sources: 10 μA to 1000 μA (programmable)
• Flash/EE Memory Endurance: 10,000 Cycles
• Flash/EE Data Retention: 10 Years (TJ = 85°C)

Features:

• Dual 24-bit ADCs (ADuCM360), Single 24-bit ADC (ADuCM361)
• ARM Cortex-M3 32-bit processor
• 128 kB Flash/EE memory, 8 kB SRAM
• UART, I2C, and 2 × SPI serial I/O
• 16-bit PWM controller with 6 output channels
• 19-pin multifunction GPIO port
• Low power modes: 4 μA (wake-up timer active)

Applications:

• Industrial automation and process control
• Intelligent precision sensing systems
• 4 mA to 20 mA loop-powered smart sensor systems
• Medical devices, patient monitoring

Package:

• 48-lead, 7 mm × 7 mm LFCSP

Analog input/output

Dual 24-bit ADCs (ADuCM360)

Single 24-bit ADC (ADuCM361)

Programmable ADC output rate (3.5 Hz to 3.906 kHz) Simultaneous 50 Hz/60 Hz noise rejection

At 50 SPS continuous conversion mode

At 16.67 SPS single conversion mode

Flexible input mux for input channel selection to both ADCs

Two 24-bit multichannel ADCs (ADC0 and ADC1)

6 differential or 11 single-ended input channels

4 internal channels for monitoring DAC, temperature sensor, IOVDD/4, and AVDD/4 (ADC1 only)

Programmable gain (1 to 128)

RMS noise: 52 nV at 3.53 Hz, 200 nV at 50 Hz

Programmable sensor excitation current sources

On-chip precision voltage reference

Single 12-bit voltage output DAC

NPN mode for 4 mA to 20 mA loop applications Microcontroller

ARM Cortex-M3 32-bit processor

Serial wire download and debug

Internal watch crystal for wake-up timer

16 MHz oscillator with 8-way programmable divider

Memory

128 kB Flash/EE memory, 8 kB SRAM In-circuit debug/download via serial wire and UART

Industrial automation and process control Intelligent precision sensing systems 4 mA to 20 mA loop-powered smart sensor systems Medical devices, patient monitoring

AVDD/IOVDD = 1.8 V to 3.6 V. The difference between AVDD and IOVDD must be ≤0.3 V. Internal 1.2 V reference, fCORE = 16 MHz, all specifications at TA = -40°C to +125°C, unless otherwise noted.

Table 14.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.

Table 15. Thermal Resistance