Instruction Manual

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General Description

The MAX6662 is a 12-bit + sign temperature sensor

combined with a programmable overtemperature alarm

and a 3-wire (SPI™-compatible) serial interface in a sin-

gle package. It converts its die temperature into digital

values using an internal analog-to-digital converter

(ADC). The temperature data is stored in a temperature

tion. The temperature data is readable at any time

through the serial interface. The operating temperature

range is -55°C to +150°C.

The MAX6662 provides two programmable watchdog

interrupt outputs. ALERT is used for lower temperature

warning functions, while OT is used for higher tempera-

ture-critical functions, such as power-supply shutdown.

The MAX6662 features a shutdown mode that saves

power by disabling everything except the serial inter-

face. The temperature sensor is available in an 8-pin SO

package.

Applications

HVAC

Refrigeration

Automotive

Test Equipment

Features

♦ 12-Bit + Sign, 0.0625°C Resolution

♦ Accuracy

±1°C max (+30°C to +50°C)

±1.6°C max (0°C to +70°C)

±2.5°C max (-20°C to +85°C)

±2.5 typ (+150°C)

♦ Extended Temperature Measurement Range

-55°C to +150°C

♦ Low Average Supply Current, 125µA (typ)

♦ Shutdown Mode to Minimize Power Consumption

in Portable Applications

♦ Two Programmable Temperature Fault Outputs

♦ Switchable Fault Queue to Eliminate False

Tripping in Noisy Environments

MAX6662

12-Bit + Sign Temperature Sensor with

SPI-Compatible Serial Interface

________________________________________________________________ Maxim Integrated Products 1

ALERT

OTGND

NCCS

SIO

SCLK

TOP VIEW

MAX6662

Pin Configuration

Ordering Information

10kΩ

0.1µF

ALERT

SIO

SCLK

SYSTEM

CONTROLLER

= +3V TO +5.5V

HEAT

SOURCES

MAX6662

Typical Operating Circuit

19-2121; Rev 0; 7/01

PART TEMP. RANGE PIN-PACKAGE

MAX6662MSA -55°C to +150°C 8 SO

SPI is a trademark of Motorola, Inc.

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.

Summary of content (9 pages)

PAGE 1
9-2121; Rev 0; 7/01 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface Features ♦ 12-Bit + Sign, 0.0625°C Resolution ♦ Accuracy ±1°C max (+30°C to +50°C) ±1.6°C max (0°C to +70°C) ±2.5°C max (-20°C to +85°C) ±2.
PAGE 2
MAX6662 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface ABSOLUTE MAXIMUM RATINGS All Voltages Are Referenced to GND VCC ...........................................................................-0.3V to +6V ALERT, OT................................................................-0.3V to +6V SIO, SCLK, CS............................................-0.3V to (VCC + 0.3V) SIO Current .......................................................
PAGE 3
12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface (VCC = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3.3V.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2.
PAGE 4
Typical Operating Characteristics (continued) (VCC = +3V, TA = +25°C, unless otherwise noted.) SHUTDOWN CURRENT VS. TEMPERATURE MAX6662 toc04 12 10 SHUTDOWN CURRENT (µA) MAX6662 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface VCC = +5.0V 8 6 VCC = +3.3V 4 2 VCC = +3.0V 0 -50 0 50 100 150 TEMPERATURE (°C) Pin Description PIN NAME FUNCTION 1 SCLK 2 CS Chip Select Input. Set low to enable the serial interface for data input/output. 3 SIO Serial-Data Input/Output.
PAGE 5
12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface MAX6662 VCC OT 12 -BIT + SIGN ADC ALERT TEMPERATURE TLOW THIGH TMAX THYST CONFIGURATION SIO SCLK SERIAL INTERFACE CS Figure 1. MAX6662 Simplified Functional Diagram For example: If THIGH is set to 100°C and THYST is set to 20°C, ALERT does not assert until temperature exceeds 100°C. If the temperature is then read through the serial interface, ALERT deasserts. ALERT asserts again when temperature is less than 80°C (Figure 2).
PAGE 6
MAX6662 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface Temperature Fault Queue The activation of ALERT and OT is subject to the depth of the fault queue. If the Fault Queue bit in the Configuration register is enabled, ALERT or OT does not assert until four consecutive temperature conversions are at fault.
PAGE 7
12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface COMMAND DESCRIPTION C1h Temperature register read C3h Configuration register read C5h THYST register read C7h TMAX register read C9h TLOW register read MAX6662 Registers CBh THIGH register read The MAX6662 has six registers: Temperature, Configuration, THYST, TMAX, TLOW, and THIGH registers. They are all 16 bits (Figure 5). The Temperature register is read only; all other registers can be read from or written to.
PAGE 8
MAX6662 12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface Table 3. Output Code vs. Temperature TEMPERATURE (°C) BINARY CODE +150.0000 0100 1011 0000 0xxx +125.0000 0011 1110 1000 0xxx +25.0000 0000 1100 1000 0xxx +0.0625 0000 0000 0000 1xxx 0.0000 0000 0000 0000 0xxx -0.0625 1111 1111 1111 1xxx -25.0000 1111 0011 0111 0xxx -55.0000 1111 1100 0111 0xxx stored in the Temperature register and is in °C, using a two’s-complement format with 1LSB corresponding to 0.
PAGE 9
12-Bit + Sign Temperature Sensor with SPI-Compatible Serial Interface SOICN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.