Detailed Description

The MAX6607/MAX6608 analog output temperature

sensors’ output voltage is a linear function of its die

temperature. The slope of the output voltage is

10mV/°C, and there is a 500mV offset at 0°C to allow

measurement of negative temperatures. The maximum

supply current is 15

µA, and the supply voltage range is

from +1.8V to +3.6V for the -20°C to +85°C tempera-

ture range.

Transfer Function

The temperature-to-voltage transfer function has an

approximately linear positive slope and can be

described by the equation:

°C)

where T is the die temperature of the MAX6607/

MAX6608 in

°C.

Therefore:

T (

Applications Information

Sensing Circuit Board and

Ambient Temperatures

Temperature sensor ICs like the MAX6607/MAX6608

that sense their own die temperatures must be mount-

ed on, or close to, the object whose temperature they

are intended to measure. Because there is a good ther-

mal path between the package’s metal leads and the

IC die, the MAX6607/MAX6608 can accurately measure

the temperature of the circuit board to which it is sol-

dered. If the sensor is intended to measure the tempera-

ture of a heat-generating component on the circuit board,

it should be mounted as close as possible to that compo-

nent and should share supply and ground traces (if they

are not noisy) with that component where possible. This

maximizes the heat transfer from the component to the

sensor.

The thermal path between the plastic package and the

die is not as good as the path through the leads, so the

MAX6607/MAX6608, like all temperature sensors in plas-

tic packages, are less sensitive to the temperature of the

surrounding air than they are to the temperature of their

leads. They can be successfully used to sense ambient

temperature if the circuit board is designed to track the

ambient temperature.

As with any IC, the wiring and circuits must be kept insu-

lated and dry to avoid leakage and corrosion, especially if

the part is operated at cold temperatures where conden-

sation can occur.

The error introduced by the part self-heating is negligible.

Chip Information

TRANSISTOR COUNT: 111

PROCESS: BiCMOS

Low-Voltage Analog Temperature Sensors

in SC70 and SOT23 Packages

4

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Pin Description

PIN

SC70

SOT23

NAME

FUNCTION

1

5

OUT

Temperature Sensor Output

2

1

N.C.

Not Connected

3

3

A

Must be connected to GND.

44

Supply Input. Decouple with

a 0.1

µF capacitor to GND.

5

2

GND

Ground