Rainbow Electronics MAX6632 User Manual

General Description

The MAX6629–MAX6632 are local digital temperature
sensors with an SPI™-compatible serial interface. The
temperature is converted to a 12-bit + sign word with a
resolution of 0.0625°C/LSB. An extended temperature
range provides useful readings up to +150°C.

These sensors are 3-wire serial interface SPI compati­ble, allowing the MAX6629–MAX6632 to be readily con­nected to a variety of microcontrollers (µCs). The
MAX6629–MAX6632 are read-only devices, simplifying
their use in systems where only temperature data is
required.

All four digital temperature sensors require very little
supply current, making them ideal for portable systems.
The MAX6631/MAX6632 perform a temperature-to-digi­tal conversion once every 8s and require minimal aver­age supply current, 32µA (typ). The MAX6629/
MAX6630 perform a conversion once every 0.5s and
require only 200µA (typ) supply current. Any of these
temperature sensors can perform conversions more
often—up to approximately four conversions per sec­ond by reading the conversion results more often.

Applications

Features

♦ Low Power Consumption

32µA typ (MAX6631/MAX6632)
200µA typ (MAX6629/MAX6630)

♦ 12-Bit + Sign Resolution with 0.0625°C/LSB

♦ Accuracy

±1°C (max) from 0°C to +70°C
±2.3°C (max) from -20°C to +100°C
±3.2°C (max) from -40°C to +125°C
±6.5°C (max) at +150°C

♦ +150°C Extended Temperature Range

♦ SPI-Compatible Serial Interface

♦ +3.0V to +5.5V Supply Range

♦ 6-Pin SOT23 Package

MAX6629–MAX6632

12-Bit + Sign Digital Temperature Sensors

with Serial Interface

________________________________________________________________ Maxim Integrated Products 1

Pin Configurations

19-2047; Rev 1; 7/01

Ordering Information

SPI is a trademark of Motorola, Inc.

V

CC

SO

GND

SCK

µC

+3V TO +5.5V

0.1µF

MAX6629
MAX6630
MAX6631
MAX6632

CS

Typical Application Circuit

Cellular

Hard Disk Drive

HVAC

Automotive

Industrial Control
Systems

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

MAX6 629MUT- T -55°C to +150°C 6 SOT23-6 AAPM

MAX6 630MUT- T -55°C to +150°C 6 SOT23-6 AAPN

MAX6 631MUT- T -55°C to +150°C 6 SOT23-6 AAPO

MAX6 632MUT- T -55°C to +150°C 6 SOT23-6 AAPP

PIN­PACKAGE

MARK

TOP

TOP VIEW

16SO

N.C.

GND

MAX6629

2

MAX6631

34

CC

SOT23

CS

5

SCKV

16SO

GND

N.C.

MAX6630

2

MAX6632

34

CC

SOT23

CS

5

SCKV

MAX6629–MAX6632

12-Bit + Sign Digital Temperature Sensors
with Serial Interface

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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 Referenced to GND
V

CC

...........................................................................-0.3V, +6.0V

SO, SCK, CS ....................................................-0.3V, V

CC

+ 0.3V

SO .......................................................................-1mA to +50mA

Current into Any Pin ............................................................10mA

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 9.10mW/°C above +70°C)..........727mW

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

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

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

Lead Temperature .............................................................Note 2

ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, TA= -55°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 3
and 4)

Note 1: It is not recommended to operate the device above +125°C for extended periods of time.
Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device

can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles
recommended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection
Reflow. Preheating is required. Hand or wave soldering is not allowed.

TEMPERATURE

Accuracy

Power-Supply Sensitivity PSS 0.2 0.6 °C/V

Resolution 0.0625 °C

Ti me Betw een C onver sion S tar ts t

Conversion Time t

POWER SUPPLY

Supply Voltage Range V

Average Operating Current I

Power-On Reset (POR)
Threshold

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SAMPLE

CONV

CC

I

SD

I

IDLE

I

CONV

CC

TA = room temp, VCC = +3.3V -0.8 ±0.2 +0.8

0°C ≤ TA≤ +70°C, VCC = +3.3V -1.0 ±0.2 +1.0

-20°C ≤ TA≤ +85°C, VCC = +3.3V -1.6 +0.3 +1.6

-20°C ≤ TA≤ +100°C, VCC = +3.3V -2.3 +0.5 +2.3 °C

-40°C ≤ TA≤ +125°C, VCC = +3.3V -3.2 +0.8 +3.2

TA≥ -55°C, VCC = +3.3V -1.0 +1.5 +3.5

= +150°C, VCC = +3.3V -5.0 +1.5 +6.5

T

A

MAX6629, MAX6630, CS high 0.37 0.5 0.65
MAX6631, MAX6632, CS high 5.9 8 10.5

Shutdown (Note 4), VCC = +0.8V 5
ADC idle (Figure 2), CS = low 6 20Supply Current, SCK Idle

ADC converting (Figure 2) 360 650

MAX6629, MAX6630 200 400

MAX6631, MAX6632 32 50

V

falling 1.6 V

CC

180 250 320 ms

3.0 5.5 V

s

µA

µA

MAX6629–MAX6632

12-Bit + Sign Digital Temperature Sensors

with Serial Interface

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, TA= -55°C to +125°C, unless otherwise noted. Typical values are at VCC= +3.3V and TA= +25°C.) (Notes 3
and 4)

Note 3: Tested at a single temperature. Specifications over temperature are guaranteed by design.
Note 4: MAX6629–MAX6632 are not specifically equipped with a shutdown function. Their low supply current permits powering

them from the output of a logic gate. This specification is given to ensure that the MAX6629–MAX6632 do not draw
excessive currents at low supply voltages, ensuring reliable operation from a gate output.

Note 5: Timing characteristics are guaranteed by design and are not production tested.
Note 6: C

LOAD

= total capacitance of one bus line in picofarads.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

LOGIC INPUTS (CS, SCK)

Logic Input Low Voltage V

Logic Input High Voltage V

Input Leakage Current I

LOGIC OUTPUTS (SO)

Output Low Voltage V

Output High Voltage V

TIMING CHARACTERISTICS (Notes 5 and 6)

Serial Clock Frequency f

SCK Pulse Width High t

SCK Pulse Width Low t

CS Fall to SCK Rise t
CS Fall to Output Enable t
CS Rise to Output Disable t

SCK Fall to Output Data Valid t

IL

IH

LEAK

OL

OH

SCL

CH

CL

CSS

DV

TR

DO

0.7 x
V

CC

VIN = GND or +5.5V ±1±5µA

I

= 1.6mA 0.4 V

SINK

I

C

C

C

C

= 1.6mA VCC - 0.4 V

SOURCE

100 ns

100 ns

= 10pF 80 ns

LOAD

= 10pF 80 ns

LOAD

= 10pF 50 ns

LOAD

= 10pF 80 ns

LOAD

0.3 x
V

CC

5 MHz

V

V