MAX6603 查看數據表（PDF） - Maxim Integrated

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MAX6603

Dual-Channel, Platinum RTD-to-Voltage Signal Conditioner

Maxim Integrated 

Dual-Channel, Platinum RTD-to-Voltage

Signal Conditioner

1000

900

800

700

600

500

400

300

200

100

0

0

200Ω Pt RTD

200 400 600 800 1000

TEMPERATURE (°C)

Figure 1. Typical 200Ω Pt RTD Representation by the

Simplified Callender-Van Dusen Equation

microcontrollers that incorporate an ADC and enables a

low-cost, low-complexity solution. Ratiometricity is an

important consideration for battery-operated instru-

ments, automotive, and some industrial applications.

Temperature Information

The MAX6603 measures the resistance between the

RTD and translates that into a high-level output voltage.

The resistance range of the MAX6603 is between 150Ω

and 900Ω, covering a -40°C to +1000°C temperature

range. When R(T) goes too low or too high, a fault con-

dition is asserted and the respective DG_ goes low.

Output Voltage

The following equation describes the output voltage:

where:

VOUT

=

VCC × R(T)

1000

VCC = supply voltage

R(T) = RTD resistance given by Callendar-

Van Dusen equation.

Using Other Pt RTDs

The MAX6603 is designed for a 200Ω Pt RTD, but the

device can work with any RTD as long as the resistance

is in the 150Ω to 900Ω range. A 500Ω Pt RTD can be

used for temperatures up to +208°C because that tem-

perature results in R(T) = 900Ω.

Input Overvoltage Protection to +16V

The input pins RS1+, RS1-, RS2+, and RS2- protect the

MAX6603 from overvoltage conditions up to +16V with-

out damaging the device.

Diagnostic Outputs (DG1, DG2)

The MAX6603 continuously monitors the excitation

current to the RTD, the resultant voltage drop, and

voltage levels of the inputs to detect fault conditions.

Any fault condition causes the respective DG output to

assert low. Fault conditions occur for RTD open circuits;

RTD short circuits; and RS1+, RS1-, RS2+, and RS2-

short to ground or supply. If any fault is detected, the

respective DG output asserts low. OUT1 and OUT2 are

high impedance on assertion of DG1 and DG2, respec-

tively. An example circuit showing potential fault condi-

tions is shown in Figure 2.

Applications Information

Ratiometric Output Coupled to a

Microcontroller

The circuit of Figure 3 shows the MAX6603 connected to

the microcontroller using VCC as the ADC reference volt-

age. The output is ratiometric to VCC, and temperature

measurements are independent of the supply voltage.

PROCESS: BiCMOS

Chip Information

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