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Rainbow Electronics MAX6626 User Manual

C-compatible serial interface in a sot23, General description, Applications

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General Description

The MAX6625/MAX6626 combine a temperature sensor,
a programmable overtemperature alarm, and an I

2

C™-

compatible serial interface into single compact packages.
They convert their die temperatures into digital values
using internal analog-to-digital converters (ADCs). The
result of the conversion is held in a temperature register,
readable at any time through the serial interface. A dedi-
cated alarm output, OT, activates if the conversion result
exceeds the value programmed in the high-temperature
register. A programmable fault queue sets the number of
faults that must occur before the alarm activates, prevent-
ing spurious alarms in noisy environments. OT has pro-
grammable output polarity and operating modes.

The MAX6625/MAX6626 feature a shutdown mode that
saves power by turning off everything but the power-on
reset and the I

2

C-compatible interface. Four separate

addresses can be configured with the ADD pin, allowing
up to four MAX6625/MAX6626 devices to be placed on
the same bus. The MAX6625P/MAX6626P OT outputs are
open drain, and the MAX6625R/MAX6626R OT outputs
include internal pullup resistors.

The MAX6625 has a 9-bit internal ADC and can function
as a replacement for the LM75 in most applications. The
MAX6626 has a 12-bit internal ADC. Both devices come
in the space-saving 6-pin SOT23 package.

Applications

Fan Control
Temperature Alarms
System Temperature Control
Industrial Equipment

Features

9-Bit Temperature-to-Digital Converter (MAX6625)
12-Bit Temperature-to-Digital Converter (MAX6626)
Accuracy

±1°C (T

A

= +25°C)

±1.5°C (0°C to +50°C)
±2°C (0°C to +70°C)
±3°C (-40°C to +85°C)
±4°C (-55°C to +125°C)

133ms Conversion Time

I

2

C-Compatible Serial Interface

Up to Four Devices on a Single Bus
Versatile Alarm Output with Programmable Trip

Temperature and Hysteresis

Low-Power Shutdown Mode
Space-Saving 6-Pin SOT23 Package

MAX6625/MAX6626

9-Bit/12-Bit Temperature Sensors with

I

2

C-Compatible Serial Interface in a SOT23

________________________________________________________________ Maxim Integrated Products

1

GND

OT

SCL

1

6

V

S

5

ADD

SDA

MAX6625
MAX6626

SOT23-6

TOP VIEW

2

3

4

Pin Configuration

4

6

V

S

0.1

µF

1

MAX6625
MAX6626

3

SCL

TO I

2

C

MASTER

10k
(OMIT FOR MAX6625R
AND MAX6626R)

SDA

5

2

1k

1k

OT OUTPUT

Typical Operating Circuit

19-1841; Rev 2; 7/02

*For device options, see Selector Guide at end of data sheet.
Requires special solder temperature profile described in the
Absolute Maximum Ratings section.

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

M A X6 6 2 5 P M U T - T *

-55

°C to +125°C

6 SOT23-6

MAX6625RMUT-T*

-55

°C to +125°C

6 SOT23-6

M A X6 6 2 6 P M U T - T *

-55

°C to +125°C

6 SOT23-6

MAX6626RMUT-T*

-55

°C to +125°C

6 SOT23-6

I

2

C is a trademark of Philips Corp.

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.