General Description

The MAXQ3120 microcontroller is a high-performance, 16-bit microcontroller that incorporates dual, true-differential, 16-bit sigma-delta analog-to-digital converters (ADCs), a liquid-crystal display (LCD) interface that can drive up to 112 segments, and a real-time clock (RTC) module with a dedicated battery-backup supply. The MAXQ3120 is uniquely suited for the single-phase electricity metering market, but can be used in any application that requires high-performance operation.

Features

♦ High-Performance, Low-Power, 16-Bit RISC Core

DC to 8MHz Operation, Approaching 1MIPS per MHz

3.3V Core and I/O

33 Instructions, Most Single-Cycle

Three Independent Data Pointers Accelerate Data Movement with Automatic Increment/Decrement

16-Level Hardware Stack

16-Bit Instruction Word, 16-Bit Data Bus

16 x 16-Bit, General-Purpose Working Registers

Optimized for C-Compiler (High-Speed/Density Code)

♦ Program and Data Memory

16kWords Flash Memory

1,000,000 Flash Write/Erase Cycles

256 Words of Internal Data RAM

JTAG Bootloader for Programming

♦ Dual, 16-Bit Sigma-Delta ADCs

Differential Analog Input Channels

Programmable Gain of 1x or 16x

Integrated Sinc3 Filters

Digital Phase Compensation and Trimmable Bandgap Reference

♦ Peripheral Features

Up to 32 General-Purpose I/O Pins

112-Segment LCD Driver

Up to 4 COM and 28 Segments

Static, 1/2, and 1/3 LCD Bias Supported

No External Resistors Required

Two Serial USARTs, One with Infrared PWM Support

One-Cycle, 16 x 16 Hardware Multiply/Accumulate with 40-Bit Accumulator

Three 16-Bit Programmable Timers/Counters, One with Infrared PWM Support

8-Bit, Subsecond, System Timer/Alarm

Battery-Backed, 32-Bit RTC with Time-of-Day Alarm and Digital Trim

Programmable Watchdog Timer

♦ Flexible Programming Interface

Bootloader Simplifies Programming

In-System Programming Through JTAG

Supports In-Application Programming of Flash

Memory

♦ Power Consumption

< 28mA at 8MHz, 3.3V Flash Operation

320µA Standby Current in Sleep Mode

Low-Power Divide-by-256 Mode

Applications

Single-Phase Electricity Metering

Battery-Powered and Portable Devices

Electrochemical and Optical Sensors

Industrial Control

Data-Acquisition Systems and Data Loggers

Home Appliances

Consumer Electronics

Thermostats/Humidity Sensors

Security Sensors

Gas and Chemical Sensors

HVAC

Smart Transmitters