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PDF MAX6603 Data sheet ( Hoja de datos )
| Número de pieza | MAX6603 | |
| Descripción | Platinum RTD-to-Voltage Signal Conditioner | |
| Fabricantes | Maxim Integrated Products | |
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19-3975; Rev 0; 4/06
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
General Description
The MAX6603 dual-channel, platinum RTD-to-voltage
signal conditioner excites and amplifies the signal from
two external 200Ω platinum-resistive temperature
devices (Pt RTD) to achieve high-voltage, level-filtered
signals for temperature measurements. The MAX6603
provides a direct ratiometric output voltage to simplify
the interface to microcontrollers with integrated analog-
to-digital converters (ADCs). External precision resis-
tors and calibration processes are not needed. The
MAX6603 provides the necessary signal-conditioning
www.DfuantacSthioenets4,U.icnocmluding ratiometric excitation current,
amplification, buffered voltage outputs, diagnostic fault
detections, and input protection. The MAX6603 ampli-
fies signals from two RTDs operating over the -40°C to
+1000°C temperature range and provides the tempera-
ture information as two independent analog voltages.
The MAX6603 features a ±6°C (max) accuracy over the
+400°C to +600°C temperature range.
The MAX6603 has overvoltage protection up to +16V
on RTD inputs, and ±5kV electrostatic discharge (ESD)
protection at RTD input pins for reliable operation
where RTD temperature-sensing probes are used. The
MAX6603 monitors the RTD for faults and asserts the
respective DG output low for fault conditions. The ana-
log voltage outputs can be readily connected to a vari-
ety of microcontrollers.
The MAX6603 is available in a small, 10-pin TDFN-EP
package and operates over the -40°C to +125°C auto-
motive temperature range from a single +3V to +5.5V
power supply.
Applications
Automotive Exhaust Temperature Monitoring
Engine Control Management to Meet EURO IV
Regulations
Braking Systems
Industrial Temperature Sensors
Food Transportation Monitoring Systems
Industrial Process Measurements
Features
♦ Amplifies Pt RTD Temperature Signals
♦ ±5kV ESD Protection on RTD Inputs
♦ +16V Overvoltage Fault Protection on RTD Inputs
♦ Low RTD Excitation Current Minimizes Self-
Heating Errors
♦ Small, 10-Pin TDFN Package
♦ Fully Ratiometric Operation
♦ No Calibration Required for Standard RTDs
♦ RTD Diagnostic Check
♦ High Accuracy: ±6°C (max) from +400°C to +600°C
Ordering Information
PART
MAX6603ATB+
PIN-PACKAGE
10 TDFN-EP*
RTD
200Ω**
PKG
CODE
T1033-1
Note: Device is specified over the -40°C to +125°C tempera-
ture range.
*EP = Exposed pad.
+Denotes lead-free package.
**Other base resistance values can be accommodated.
Contact the factory for more information.
TOP VIEW
Pin Configuration
VCC 1 +
RS2- 2
RS2+ 3
RS1+ 4
RS1- 5
MAX6603
10 DG2
9 OUT2
8 OUT1
7 DG1
6 GND
TDFN
3mm x 3mm x 0.8mm
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
PIN NAME
1 VCC
2 RS2-
3 RS2+
4 RS1+
5 RS1-
6 GND
www.DataS7heet4U.comDG1
8 OUT1
9 OUT2
10 DG2
— EP
Pin Description
FUNCTION
Power-Supply Input. Bypass to GND with a 0.1µF capacitor as close to VCC as possible.
Sense Resistor 2 Negative Input
Sense Resistor 2 Positive Input
Sense Resistor 1 Positive Input
Sense Resistor 1 Negative Input
Ground
Diagnostic Output Signal 1. DG1 asserts low upon fault detection.
Output Analog Voltage 1. OUT1 is high impedance upon DG1 assertion.
Output Analog Voltage 2. OUT2 is high impedance upon DG2 assertion.
Diagnostic Output Signal 2. DG2 asserts low upon fault detection.
Exposed Pad. Connect to GND.
Functional Block Diagram
VCC
RS1+
VCC
RSRC
ESD
CLAMP
MAX6603
AMP
RS1-
ESD
CLAMP
VCC
IEXC
HI-V
DETECT
FAULT
DETECT
OUT1
DG1
RS2+
RSRC
ESD
CLAMP
AMP
RS2-
ESD
CLAMP
IEXC
HI-V
DETECT
FAULT
DETECT
OUT2
DG2
GND
Detailed Description
The MAX6603 converts a Deutsche Institute for Normung
(DIN) standard 200Ω Pt RTD to a high-level analog volt-
age without the need for external trims or precise dis-
crete components. The Pt RTD resistance conveys
temperature information approximated by the Callendar-
Van Dusen equation and is represented in Figure 1:
R(T) = RO[1 + AT + BT2+ CT3]
where: R(T) = Resistance of Pt RTD at temperature (T)
R0 = Base resistance in ohms at 0°C
T = Temperature in °C
A = 3.9083 E-3 °C-1 (alpha coefficient 1)
B = -5.7750 E-7 °C-2 (alpha coefficient 2)
C = 0 (approximation for temperatures > 0°C)
(Alpha coefficients can vary depending on
standards.)
The MAX6603 applies a constant excitation current of
1mA (typ) through the Pt RTD, generating a voltage
drop that is amplified and results in a high-level output
voltage. The excitation current (IEXC) typically varies
ratiometrically by 0.2mA/V (typ) with respect to VCC,
and therefore, the amplified signal is ratiometric to the
power supply. The voltage amplification from input to
output is 5 (typ). The output voltage is applied to a
ratiometric ADC to produce a digital value independent
of supply voltage. For ADCs that use VCC as their refer-
ence voltage, sudden changes in the supply voltage do
not affect the microcontroller’s reading of the tempera-
ture. Ratiometricity simplifies the connection to most
_______________________________________________________________________________________ 5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX6603.PDF ] | |
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