General Description

The MAXQ3100 microcontroller is a low-power, 16-bit

RISC device that incorporates an integrated liquid-crystal

display (LCD) interface that can drive up to 160 seg-

ments, two analog comparators with precision internal

1.25V reference voltage, and a real-time clock (RTC)

module with a dedicated battery-backup supply. An inter-

nal temperature sensor allows software to monitor device

temperature and optionally interrupt to alert when a tem-

perature conversion is complete. The MAXQ3100 is

uniquely suited for single-phase electricity metering appli-

cations that require an external analog front-end, but can

be used in any application that requires high-perfor-

mance operation. The device operates at a fixed

4.194MHz, generated from the 32.76kHz RTC crystal. The

device has 8kWords of EEPROM, 512 words of RAM,

three 16-bit timers, and two universal synchronous/asyn-

chronous receiver/transmitters (USARTs). The microcon-

troller core and I/O are powered by a single 3.3V supply,

and an additional battery supply keeps the RTC running

during power outages.

Features

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

4.194MHz 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

8kWords EEPROM

200,000 EEPROM Write/Erase Cycles

512 Words of Internal Data RAM

JTAG-Compatible Debug Port Bootloader for

Programming

♦ Peripheral Features

Up to 27 General-Purpose I/O Pins, Most 5V

Tolerant

160-Segment LCD Driver

Up to 4 COM and 40 Segments

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

No External Resistors Required

Two Analog Comparators with Internal +1.25V

Precision Reference

Two Serial USARTs, One with Infrared PWM

Support

Digital Temperature Sensor

Three 16-Bit Programmable Timers/Counters

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 Debug Port

Supports In-Application Programming of EEPROM

♦ Power Consumption

1.9mA at 4.194MHz, 3.6V Operation

1.9µA Standby Current in Sleep Mode

Low-Power Divide-by-256 Mode

Mixed-Signal Microcontroller with Analog

Comparators, LCD, and RTC

________________________________________________________________

Maxim Integrated Products

1

Rev 0; 6/07

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

Typical Application Circuits and Pin Configuration appear

at end of data sheet.

Note: Some revisions of this device may incorporate deviations

from published specifications known as errata. Multiple revi-

sions of any device may be simultaneously available through

various sales channels. For information about device errata, go

to: www.maxim-ic.com/errata.

MAXQ is a registered trademark of Maxim Integrated Products, Inc.

+

Denotes a Pb-free/RoHS-compliant device.

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAXQ3100-EMN+

-40°C to +85°C

80 MQFP

Utility Meters

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

Applications