MAX6603ATB+T Maxim Integrated Products, MAX6603ATB+T Datasheet - Page 6

• Manufacturer Part Number: MAX6603ATB+T
• Description: IC COND RTD-VOLT 10-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Signal Conditionerr

Specifications of MAX6603ATB+T

• Input Type: Voltage
• Output Type: Logic
• Current - Supply: 5.5mA
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
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.
The following equation describes the output voltage:
where:
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
6
Figure 1. Typical 200Ω Pt RTD Representation by the
Simplified Callender-Van Dusen Equation
_______________________________________________________________________________________
V
R(T) = RTD resistance given by Callendar-
Van Dusen equation.
1000
900
800
700
600
500
400
300
200
100
CC
0
0
= supply voltage
V
200
OUT
Temperature Information
TEMPERATURE (°C)
200Ω Pt RTD
=
400
V
CC
1
600
000
× ( ) T
R
Output Voltage
800
1000
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.
The input pins RS1+, RS1-, RS2+, and RS2- protect the
MAX6603 from overvoltage conditions up to +16V with-
out damaging the device.
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.
The circuit of Figure 3 shows the MAX6603 connected to
the microcontroller using V
age. The output is ratiometric to V
measurements are independent of the supply voltage.
PROCESS: BiCMOS
Input Overvoltage Protection to +16V
Ratiometric Output Coupled to a
Diagnostic Outputs (
Applications Information
CC
Chip Information
Using Other Pt RTDs
as the ADC reference volt-
CC
Microcontroller
, and temperature
DG1 , DG2 )