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Rev 1; 8/05

High-Precision ADC

Mixed-Signal Microcontroller

General Description

The MAXQ3120 microcontroller is a high-performance,

16-bit microcontroller that incorporates dual, true-differen-

tial, 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 elec-

tricity metering market, but can be used in any applica-

tion that requires high-performance operation. The device

can operate at a maximum of 8MHz (DV

= 3.3V). The

MAXQ3120 has 16kWords of flash memory, 256 words of

RAM, three 16-bit timers, and two universal synchro-

nous/asynchronous receiver/transmitters (USARTs). The

microcontroller 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

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 Sinc

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

MAXQ3120

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

Ordering Information

PART

MAXQ3120-FFN

MAXQ3120-FFN+

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

80 MQFP

+Denotes

a Pb-free/RoHS-compliant device.

Selector Guide, Typical Operating Circuit, and

Pin Configuration appear at end of data sheet.

MAXQ is a trademark of Maxim Integrated Products, Inc.

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.

______________________________________________

Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

High-Precision ADC

Mixed-Signal Microcontroller

MAXQ3120

ABSOLUTE MAXIMUM RATINGS

Voltage Range on DV

Relative to DGND ..........-0.3V to +4.0V

Voltage Range on AV

Relative to AGND...........-0.3V to +4.0V

Voltage Range on AGND Relative to DGND .........-0.3V to +0.3V

Voltage Range on AV

Relative to DV

............-0.3V to +0.3V

Voltage Range on Any Pin Relative to DGND

Except AN0+, AN0-, AN1+, AN1-.........-0.3V to (DV

+ 0.5V)

Voltage Range on AN0+, AN0-, AN1+,

AN1- Relative to AGND ......................................-4.0V to +4.0V

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Soldering Temperature .......................................See IPC/JEDEC

J-STD-020 Specification

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(DV

, AV

= V

RST

to 3.6V, V

REF

= 1.25V (external), f

HFXIN

= 8MHz, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

Digital Supply Voltage

Digital Supply Ramp Rate

Digital Power-Fail Reset

RST

DD1

Active Current

(Note 2)

DD2

DD3

DD4

DD5

Stop-Mode Current

(DV

plus AV

)

Battery Supply Voltage

Battery Current

Input High Voltage

Input Low Voltage

Input Hysteresis (Schmitt)

Output High Voltage

(All Ports)

Output Low Voltage (All Ports,

RESET)

Input Low Current (All Ports)

RESET

Pullup Resistance

Input Leakage (All Ports)

STOP

BAT

IHYS

RST

Weak pullup disabled

= +1.5mA

= +2.5mA

= 3mA sink current

= 3.65mA sink current

= 0.4V; weak pullup enabled

-50

-1

100

200

- 0.4

- 0.5

0.4

0.5

RTCE = 1, DV

= 0V, V

BAT

= 3.6V

0.7 x

-0.3

0.6

1.8

5.1

/1 mode

/2 mode

/4 mode

/8 mode

PMM mode

SYMBOL

Can be controlled by placing a 1µF or

higher capacitor between DV

and

ground

CONDITIONS

MIN

RST

-16

2.8

2.9

5.7

3.1

1.0

320

760

3.8

+ 0.3

0.3 x

µA

kΩ

µA

TYP

3.3

MAX

3.6

+16

3.03

UNITS

V/ms

_____________________________________________________________________

High-Precision ADC

Mixed-Signal Microcontroller

ELECTRICAL CHARACTERISTICS (continued)

(DV

, AV

= V

RST

to 3.6V, V

REF

= 1.25V (external), f

HFXIN

= 8MHz, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

Analog Supply Voltage

Active Analog Supply Current

Power-Down Analog Supply

Current

SYMBOL

AVDD

= DV

Normal operation

APD2:0 = 111b

CONDITIONS

MIN

2.8

TYP

3.3

2.65

250

MAX

3.6

3.5

635

UNITS

µA

MAXQ3120

ANALOG-TO-DIGITAL CONVERTER DC ACCURACY

No missing codes, with software lowpass

ADC Resolution

filter (see Appendix A)

Offset Error

Gain = 1

Gain Error

Gain-Error Drift

Gain-Error Match

DC Power-Supply Rejection

PSRR

AN0+, AN0- = AGND; AV

= 3.0V to 3.6V

= 3.3V, AV

= 3.3V, AN0 = 25mV,

peak-to-peak sine wave at 65Hz, gain = 16

Signal-to-Noise Ratio

SNR

With software lowpass filter, cutoff at 21st

harmonic (see Appendix A)

With software lowpass filter, cutoff at 7th

harmonic (see Appendix A)

Total Harmonic Distortion

THD

= 3.3V, AV

= 3.3V, AN0 = 25mV,

peak-to-peak sine wave at 65Hz, gain = 16

(up to 21st harmonic)

ANALOG-TO-DIGITAL CONVERTER DYNAMIC SPECIFICATIONS

Gain = 1

±5.0

±10

±0.5

bits

ppm

-79

-55

ANALOG-TO-DIGITAL CONVERTER INPUTS

Input-Voltage Range

Input Sampling Capacitance

(Note 3)

Input Sampling Rate

Sample Output Rate

Input Impedance to AGND

(Note 5)

Differential Input Impedance

(Note 6)

Input Bandwidth (-3dB)

Reference Input Voltage

Reference Input Sampling

Capacitance

Reference Input Sampling Rate

REF

1.2

Gain = 1

Gain = 16

Gain = 1

Gain = 16

AN0+, AN0-; AN1+, AN1- to AGND

Channel 0

(Note 4)

Gain = 1

Gain = 16

-1

1.33

HFXIN

384

750

1500

5.5

1.25

1.33

1.3

MHz

sample

/ sec

kΩ

kHz

MHz

_____________________________________________________________________

High-Precision ADC

Mixed-Signal Microcontroller

MAXQ3120

ELECTRICAL CHARACTERISTICS (continued)

(DV

, AV

= V

RST

to 3.6V, V

REF

= 1.25V (external), f

HFXIN

= 8MHz, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

INTERNAL REFERENCE

Reference Output Voltage

Reference-Output Temperature

Coefficient

Load Regulation

LCD INTERFACE

LCD Reference Voltage

LCD Bias Voltage 1

LCD Bias Voltage 2

LCD Adjustment Voltage (Note 7)

LCD Bias Resistor

LCD Adjust Resistor

LCD

LCD1

LCD2

ADJ

LCD

LADJ

LRA4:LRA0 = 0

Segment is driven at V

LCD

; V

LCD

= 3V,

SEGxx

= -3µA, guaranteed by design

Segment is driven at V

LCD1

; V

LCD1

= 2V,

SEGxx

= -3µA, guaranteed by design

Segment is driven at V

LCD2

; V

LCD2

= 1V,

SEGxx

= -3µA, guaranteed by design

Segment is driven at V

ADJ

; V

ADJ

= 0V,

SEGxx

= +3µA, guaranteed by design

CLOCK SOURCE

External Crystal Frequency

REAL-TIME CLOCK

RTC Input Frequency

JTAG/FLASH PROGRAMMING

JTAG Clock Rate

Flash Erase Time

Flash Programming Time

Write/Erase Cycles

Data Retention

1,000,000

TCK

Mass erase

Page erase

904

313

sysclk / 8

µs

Cycles

Years

32KIN

32kHz watch crystal

32.768

kHz

HFXIN

MHz

LCD

0.02

LCD1

0.02

LCD2

0.02

ADJ

Guaranteed by design

ADJ

+ 2/3

LCD

- V

ADJ

)

ADJ

+ 1/3

LCD

- V

ADJ

)

LCD

LCD1

LCD2

0.1

0.4 x

LCD

kΩ

With V

REF

bandgap trimming

(ATRM[4:0] = 01111b)

REF

= ±2µA, C

= 12pF

1.25

±120

±35

±50

±500

ppm/°C

µV/µA

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LCD Segment Voltage

SEGxx

Note 1:

Specifications to -40°C are guaranteed by design and not production tested. All typical values are guaranteed by design

characterization and are not production tested.

Note 2:

Tested with T

= +25°C, DV

= 3.3V, and all peripherals inactive except for port pins.

Note 3:

These numbers are guaranteed by design and are not tested.

Note 4:

Can be calculated as (f

HFXIN

/ 6).

Note 5:

Can be calculated as 6 / (f

HFXIN

x C

Note 6:

Can be calculated as 12 / (f

HFXIN

x C

Note 7:

Assumes that no external components are connected to V

LCD

, V

LCD1

, V

LCD2

, or V

ADJ

_____________________________________________________________________

High-Precision ADC

Mixed-Signal Microcontroller

MAXQ3120

Typical Operating Characteristics

= +25°C, unless otherwise noted.)

DIGITAL SUPPLY CURRENT

vs. CLOCK FREQUENCY

MAXQ3120 toc01

PORT PIN HIGH OUTPUT VOLTAGE

vs. SOURCE CURRENT

MAXQ3120 toc02

PORT PIN LOW-OUTPUT VOLTAGE

vs. SINK CURRENT

0.9

0.8

0.7

(V)

= +85°C

VDD

= 2.8V

MAXQ3120 toc03

VDD

= +3.6V

DD1

(mA)

2.8

2.7

2.6

2.5

(V)

2.4

2.3

2.2

= +85°C

= +25°C

VDD

= 2.8V

1.0

0.6

0.5

0.4

0.3

= -40°C

= +25°C

= +85°C

2.1

= -40°C, +25°C

2.0

1.9

= -40°C

0.2

0.1

HFXIN

(MHz)

1.8

(mA)

REFERENCE VOLTAGE OUTPUT

vs. LOAD CURRENT

MAXQ3120 toc04

SIGNAL-TO-NOISE RATIO

vs. INPUT FREQUENCY

MAXQ3120 toc05

1.29

VDD

= 3.3V

1.28

= +25°C, +85°C

= +85°C

= +25°C

= -40°C

-100

-50

REF

(µA)

100

INPUT FREQUENCY (kHz)

SNR (dB)

REF

= +1.25V

VDD

= 3.3V

REF

(V)

1.27

1.26

1.25

1.24

_____________________________________________________________________