Low Cost, 2.7 V to 5.5 V, Micropower

Temperature Switches in SOT-23

Preliminary Technical Data

ADT6501/ADT6502/ADT6503/ADT6504

Rev. PrA

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FEATURES

±0.5°C (typ) accuracy over temperature range

Factory set trip points from −45°C to +15°C in 10°C

increments

Factory set trip points from +35°C to +115°C in 10°C

increments

No external components required

Max temperature of +125°C

Open-drain output (ADT6501/ADT6503)

Push-pull output (ADT6502/ADT6504)

Pin selectable hysteresis of 2°C and 10°C

Supply current of 30

μA (typ)

Space saving 5-lead SOT23 package

APPLICATIONS

Medical equipment

Automotive

Cell phone

Hard disk drives

Personal computers

Electronic test equipment

Domestic appliances

Process control

FUNCTIONAL BLOCK DIAGRAM

CLK AND

TIMING

GENERATION

4

3

LPF

Σ-Δ

DIGITAL

COMPARATOR

TOVER

1

GND

HYST

TEMPERATURE

SENSOR

1-BIT

12-BIT

DECIMATOR

1-BIT

DAC

REFERENCE

+

–

5

FACTORY PRESET

TRIP POINT

REGISTER

2

GND

2°C/10°C

Figure 1.

GENERAL DESCRIPTION

The ADT6501/ADT6502/ADT6503/ADT6504 are trip point

temperature switches available in a 5-lead SOT23 package. It

contains an internal band gap temperature sensor for local

temperature sensing. When the temperature crosses the trip

point setting, the logic output is activated. The ADT6501/

ADT6503 logic output is active low and open-drain. The

ADT6502/ADT6504 logic output is active high and push-pull.

The temperature is digitized to a resolution of +0.0625°C

(12 bit). The factory settings are 10°C apart starting from −45°C

to +15°C for the cold threshold models and from +35°C to

+115°C for the hot threshold models.

These devices require no external components and typically

consume 30μA supply current. Hysteresis is pin selectable at

2°C and 10°C. The temperature switch is specified to operate

over the supply range of 2.7 V to 5.5 V.

ADT6501 and ADT6502 are used for monitoring temperatures

from +35°C to +115°C only. Hence, the logic output pin

becomes active when the temperature goes higher than the

selected trip point temperature. The ADT6503 and ADT6504

are used for monitoring temperatures from −45°C to +15°C

only. Hence, the logic output pin becomes active when the

temperature goes lower than the selected trip point

temperature.

PRODUCT HIGHLIGHTS

1.

±0.5°C typical from −55°C to +125°C.

2.

Factory threshold settings from −45°C to +115°C in 10°C

increments

3.

Supply voltage is 2.7 V to 5.5 V.

4.

Supply current of 30 μA.

5.

Space-saving 5-lead SOT23 package.

6.

Pin selectable temperature hysteresis of 2°C or 10°C.

7.

Temperature resolution of 0.0625°C.