MAXIM MAX6662 User Manual

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 sin­gle 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
register as a 13-bit word, which allows 0.0625°C resolu­tion. 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 tempera­ture-critical functions, such as power-supply shutdown.
The MAX6662 features a shutdown mode that saves
power by disabling everything except the serial inter­face. 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

1

2

87V

CC

NCCS

SIO

SCLK

SO

TOP VIEW

3

4

6

5

MAX6662

Pin Configuration

Ordering Information

10kΩ

10kΩ

0.1μF

V

CC

OT

ALERT

SIO

SCLK

CS

SYSTEM

CONTROLLER

V

CC

= +3V TO +5.5V

HEAT

SOURCES

MAX6662

Typical Operating Circuit

19-2121; Rev 0; 7/01

EVALUATION KIT

AVAILABLE

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.

PART TEMP. RANGE PIN-PACKAGE

MAX6662MSA -55°C to +150°C 8 SO

MAX6662

12-Bit + Sign Temperature Sensor with
SPI-Compatible Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(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.)

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.

All Voltages Are Referenced to GND
V

CC

...........................................................................-0.3V to +6V

ALERT, OT................................................................-0.3V to +6V

SIO, SCLK, CS............................................-0.3V to (V

CC

+ 0.3V)

SIO Current .......................................................-10mA to +50mA

Continuous Current into Any Pin (except NC)….................10mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

Operating Temperature Range (Note 1) ..........-55°C to +150°C

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

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

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: The MAX6662 is not recommended to operate above +125°C for an extended period of time.

TEMPERATURE TO DIGITAL-CONVERTER CHARACTERISTICS

Accuracy

Power-Supply Rejection Ratio PSRR 0.2 0.5 °C/V

Resolution 0.0625 °C

Supply Voltage Range V

Average Operating Current

Peak Operating Current (Note 2)

Shutdown Supply Current

Power-On-Reset Threshold V

Power-On-Reset Threshold
Hysteresis

Conversion Time t

Temperature Update Frequency 2Hz

SERIAL INTERFACE (SIO, SCLK, CS, ALERT, OT)

Input Low Voltage V

Input High Voltage V

Input/Output Leakage Current I

Input Capacitance C

Output Low Sink Current I

Output High Voltage V

Output Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

+30°C ≤ TA ≤ +50°C, VCC = +3.3V -1.0 ±0.4 +1.0

0°C ≤ TA ≤ +70°C, VCC = +3.3V -1.6 ±0.7 +1.6

-20°C ≤ TA ≤ +85°C, VCC = +3.3V -2.5 ±1.0 +2.5

CC

POR

CONV

IL

IH

LEAK

in

OL

OH

OL

-40°C ≤ TA ≤ +100°C, V

-55°C ≤ TA ≤ +125°C, V

TA ≤ +150°C, VCC = +3.3V ±2.5

VCC = +5.5V 150

= +3.0V 125

V

CC

VCC = +5.5V 300 600

= +3.0V 300 500

V

CC

VCC = +5.5V 8 22

V

= +3.0V 4 15

CC

VIN = GND or V

ALERT, OT, VOL = 0.6V 3 mA

I

= 1.6mA source V

SIO

I

= 1.6mA sink 0.4 V

SIO

CC

= +3.3V -3.0 ±1.2 +3.0

CC

= +3.3V -4.0 ±1.5 +4.0

CC

3.0 5.5 V

2.0 2.5 V

90 mV

0.25 s

0.8 V

0.7 V

CC

-5 +5 µA

5pF

- 0.4 V

C C

°C

µA

µA

µA

V

MAX6662

12-Bit + Sign Temperature Sensor with

SPI-Compatible Serial Interface

_______________________________________________________________________________________

3

Typical Operating Characteristics

(VCC= +3V, TA = +25°C, unless otherwise noted.)

ELECTRICAL CHARACTERISTICS (continued)

(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.)

Note 2: Peak operating current measured during conversion.

SERIAL INTERFACE TIMING

Serial Clock Frequency f

SCLK High Pulse Width t

SCLK Low Pulse Width t
CS High Pulse Width t

SCLK Fall to Output Data Valid t

CS Fall to SCLK Rise t
CS Rise to Output Disable t
CS to SCLK Hold Time t

SIO to SCLK Setup Time t

SIO to SCLK Hold Time t

Output Fall Time t

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCLK

CH

CL

CSW

DO

CSS

TR

CSH

DS

DH

F

200 ns

200 ns

200 ns

C

= 100pF 100 ns

LOAD

100 ns

C

= 100pF 100 ns

LOAD

0ns

100 ns

0ns

10 ns

2.5 MHz

TEMPERATURE ERROR

VS. TEMPERATURE

3

2

1

0

-1

TEMPERATURE ERROR (°C)

-2

-3

-50 3010-30 -10 50 70 90 110 130 150

VCC = +3.0V

VCC = +5.0V

TEMPERATURE (°C)

VCC = +3.3V

MAX6662 toc01

PERCENTAGE OF SAMPLES (%)

TEMPERATURE ERROR DISTRIBTUTION

90

NOTE: DEVICES

80

TRIMMED AT

= +30°C

T

A

70

60

50

40

30

20

10

0

-0.45-0.35 -0.25-0.15 0.05 0.15 0.25 0.35 0.45
TEMPERATURE ERROR (°C)

200 SAMPLES

= +30°C

T

A

SUPPLY CURRENT VS. TEMPERATURE

200

AVERAGE OVER 2

MAX6662 toc02

180

VCC = +5.0V

160

140

SUPPLY CURRENT (μA)

120

VCC = +3.0V

100

-50 500 100 150
TEMPERATURE (°C)

MAX6662 toc03

VCC = +3.3V