Rev 1; 5/06
Microcontroller with Internal Voltage Regulator,
Piezoelectric Horn Driver, and Comparator
General Description
Features
♦ High-Performance, Low-Power, 16-Bit RISC Core
DC to 3.58MHz Operation, Approaching 1MIPS
per MHz
The MAXQ3210 microcontroller is a low-power, 16-bit
RISC device that incorporates a driver for a high-output
piezoelectric horn/transducer, an analog comparator,
and a high-current I/O pin that directly drives an LED.
The device is uniquely suited for cost-conscious appli-
cations such as chemical detectors, alarm systems,
and white goods, but can be used in any application
that requires high-performance and low-power opera-
tion. The high-performance 16-bit RISC core and 8-bit
accumulators are complemented by standard ameni-
ties such as timers and digital I/O. The power con-
sumption per MIPS ratio is among the best in the 16-bit
microcontroller industry.
Low-Cost Operation from “Colorburst” Crystal or RC
Oscillator
6V to 9.5V External Voltage Supply Operates from
Single 9V Battery
5.0V Nominal Internal Operation
Up to 15 General-Purpose I/O Pins
33 Instructions, Most Single-Cycle
Three Independent Data Pointers Accelerate Data
Movement with Automatic Increment/Decrement
Two Loop Counters
4-Level Hardware Stack
16-Bit Instruction Word, 16-Bit Data Bus
16 x 8-Bit Accumulators
The MAXQ3210 is powered directly from a 6V to 9.5V
source, such as a battery, but an internal voltage regu-
lator operates the core at 5V. The microcontroller also
provides a flag if the input voltage supply falls below
JTAG Debug/Visibility Port
the low-batttery detection threshold (V ), which can be
BF
♦ Program and Data Memory
1kWord EEPROM Program Memory, Mask ROM for
High-Volume Applications
used to signal a low-voltage condition of the 9V battery.
The MAXQ3212 is a general-purpose version of the
MAXQ3210 that is powered directly from an external
5.0V supply.
128 Bytes EEPROM Data Memory
60,000 EEPROM Write/Erase Cycles
64 Bytes SRAM Data Memory
A 1kWord EEPROM program memory stores customer
application code and software algorithms. Software is
programmable in-system by the ROM-based boot-
loader and also in-application programmable under
user software control. The device provides 64 bytes of
volatile SRAM and 128 bytes of EEPROM in the data
memory space. Contact Dallas Semiconductor con-
cerning the availability of ROM-based devices for high-
volume, low-cost applications.
In-System Programming
♦ Peripheral Features
Piezoelectric Horn Driver
16-Bit Programmable Timer/Counter with Prescaler
High-Current I/O Pin Suitable for LED Drive
Programmable Watchdog Timer
Selectable Power-Fail Reset
Power-On Reset (POR)
Wake-Up Timer
Internal 8kHz Ring Oscillator
Applications
♦ Flexible Programming Interface
Integrated Bootloader
Gas and Chemical
Sensors
Electrochemical and
Optical Sensors
In-System/In-Application Programming of EEPROM
Security Alarm Systems
Environmental Systems
Battery-Powered and
Portable Devices
Home Appliances
Thermostats/Humidity
Sensors
Through JTAG
♦ Ultra-Low-Power Consumption
< 6mA at 3.58MHz
5.5µA Standby Current (typ)
Low-Power Divide-by-256 Mode
♦ Analog Features
Typical Operating Circuits, Pin Configuration, and Ordering
Information appear at end of data sheet.
Analog Comparator Uses Internal or External Voltage
Reference
+2.5V Reference Output Available
On-Chip Voltage Regulator Supports Up to 9.5V as
Power Supply
Low-Battery Detection
5V Regulated Output Available, Up to 50mA
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
Note: Some revisions of this device may incorporate deviations
from published specifications known as errata. Multiple revisions
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
1
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.
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