MAX6603_V01 [MAXIM]
Dual-Channel, Platinum RTD-to-Voltage Signal Conditioner;
| 型号： | MAX6603_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Dual-Channel, Platinum RTD-to-Voltage Signal Conditioner |
| 文件： | 总9页 (文件大小：659K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
General Description
Features
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 convert-
ers (ADCs). External precision resistors and calibration
processes are not needed. The MAX6603 provides the
necessary signal-conditioning functions, including ratio-
metric excitation current, amplification, buffered voltage
outputs, diagnostic fault detections, and input protection.
The MAX6603 amplifies signals from two RTDs operat-
ing over the -40°C to +1000°C temperature range and
provides the temperature information as two independent
analog voltages. The MAX6603 features a ±6°C (max)
accuracy over the +400°C to +600°C temperature range.
● 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
PKG
CODE
PART
PIN-PACKAGE
RTD
The MAX6603 has overvoltage protection up to +16V on
RTD inputs, and ±5kV electrostatic discharge (ESD) pro-
tection 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 analog voltage outputs
can be readily connected to a variety of microcontrollers.
MAX6603ATB+
10 TDFN-EP*
200Ω**
T1033-1
Note: Device is specified over the -40°C to +125°C tempera-
ture range.
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
**Other base resistance values can be accommodated.
Contact the factory for more information.
The MAX6603 is available in a small, 10-pin TDFN-EP
package and operates over the -40°C to +125°C automo-
tive temperature range from a single +3V to +5.5V power
supply.
Pin Configuration
TOP VIEW
Applications
● Engine Control Management to Meet EURO IV
Regulations
● Braking Systems
● Industrial Temperature Sensors
● Food Transportation Monitoring Systems
● Industrial Process Measurements
+
V
1
2
3
4
5
10 DG2
CC
RS2-
RS2+
RS1+
RS1-
9
8
7
6
OUT2
OUT1
DG1
MAX6603
GND
TDFN
3mm x 3mm x 0.8mm
19-3975; Rev 1; 4/14
MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Absolute Maximum Ratings
(All voltages referenced to GND, unless otherwise noted.)
ESD Protection (OUT1, OUT2, DG1, DG2,
Human Body Model)......................................................>±2kV
ESD Protection (RS1+, RS2+, RS1-, RS2-,
V
.......................................................................-0.3V to +6.0V
CC
RS1+, RS1-, RS2+, RS2-...................................-0.3V to +18.0V
+ 0.3V)
OUT1, OUT2, DG1, DG2 ......................... -0.3V to (V
V
, GND, Human Body Model)...................................>±5kV
CC
CC
Continuous Power Dissipation (T = +70°C)
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
A
10-Pin TDFN Single-Layer Board
(derate 18.5 mW/°C above +70°C) ........................1481.5mW
10-Pin TDFN Multilayer Board
(derate 24.4 mW/°C above +70°C) ........................1951.2mW
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
= 3.0V to 5.5V, resistor connected between RS1+ and RS1- = 560Ω, resistor connected between RS2+ and RS2- = 560Ω,
CC
T
= -40°C to +125°C, unless otherwise noted. Typical values are at V
= 5.0V, R = 47kΩ between OUT_ and GND, T = +25°C.)
L A
A
CC
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
16
UNITS
Supply Voltage
V
V
3.0
V
V
CC
Input Over Voltage
RS1+, RS1-, RS2+, RS2-
RS
3.9
5.5
Supply Current
I
mA
CC
Sink current during overvoltage fault
= V = V = V = +16V
36.2
47.1
V
RS1+
RS1 -
RS2+
RS2-
CURRENT SOURCES
Excitation Current
I
(Note 2)
(Note 2)
0.58
1.0
-7
1.12
mA
EXC
Excitation-Current Temperature
Coefficient
TCI
ppm/°C
EXC
Minimum RS_- Voltage
Maximum RS_+ Voltage
Supply Ratiometric
V
3.4
4.0
0.2
V
V
RS_-
V
RS_+
I
V
= +3V to +5.5V
mA/V
RATIO
CC
MAXIMUM TEMPERATURE ERROR (Note 3)
+400°C to +600°C, V
= 5.0V
±6
±8
CC
-40°C to +400°C, V
= 5.0V
CC
+600°C to +1000°C, V
= 5.0V
±12
±10
CC
RTD
°C
+400°C to +600°C, V
= 3.0V
CC
-40°C to +400°C, V
= 3.0V
±13.3
±20
CC
+600°C to +1000°C, V
= 3.0V
CC
Maxim Integrated
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Electrical Characteristics (continued)
(V
= 3.0V to 5.5V, resistor connected between RS1+ and RS1- = 560Ω, resistor connected between RS2+ and RS2- = 560Ω,
CC
T
= -40°C to +125°C, unless otherwise noted. Typical values are at V
= 5.0V, R = 47kΩ between OUT_ and GND, T = +25°C.)
CC L A
A
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAXIMUM INPUT RESISTANCE-TO-OUTPUT VOLTAGE ERROR
494Ω to 627Ω, V
200Ω to 494Ω, V
= 5.0V
= 5.0V
= 5.0V
= 3.0V
= 3.0V
= 3.0V
19
27
33
19
27
33
CC
CC
CC
CC
CC
CC
627Ω to 866Ω, V
RTD (Note 4)
mV
494Ω to 627Ω, V
200Ω to 494Ω, V
627Ω to 866Ω, V
ANALOG OUTPUTS (OUT1, OUT2)
R = 47kΩ between OUT_ and V
(Note 5)
L
CC
Output-Voltage Low (Max)
Output-Voltage High (Min)
V
0.1
V
V
OL
R = 47kΩ between OUT_ and GND
V
CC
0.1
-
L
V
OH
(Note 5)
V
V
= V
22
12
mA
mA
pF
OUT
CC
Short-Circuit Current
I
SC
= GND
OUT
Maximum Capacitive Load
Minimum Resistive Load
C
R
500
20
L
Between OUT_ and GND
kΩ
L
DIAGNOSTIC OUTPUTS (DG1, DG2)
Output-Voltage Low
V
I
I
= 1mA
SOURCE
0.2
V
V
OL
V
CC
0.2
-
Output-Voltage High
V
= 1mA
SINK
OH
Minimum Resistance for RS+,
RS - Open
R
8000
60
Ω
Ω
RS - OPEN
Maximum Resistance for RS+,
RS - Short
R
RS - SHORT
Note 1: All parameters are tested at T = +25°C. Specifications over temperature are guaranteed by design.
A
Note 2: RTD resistance range is 150Ω to 900Ω for constant excitation current.
2
Note 3: A typical 200Ω RTD: R(T) = R [1 + AT + BT ] is referenced for probe temperature-probe resistance relation. The param-
O
eters in this section are not tested and are for reference only.
Note 4: RTD resistance is tested only at R
= 200Ω, 560Ω, 845Ω. The range is guaranteed by design.
RTD
Note 5: Parameters are tested in special test mode.
Maxim Integrated
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Typical Operating Characteristics
(V
= 5.0V, T = +25°C, unless otherwise noted.)
A
CC
OUTPUT-VOLTAGE DRIFT
SUPPLY CURRENT
vs. TEMPERATURE
vs. SUPPLY VOLTAGE
20
3.8
T
= +125°C
A
3.5
3.2
2.9
2.6
2.3
2.0
10
0
T
= +85°C
A
T
A
= +25°C
T
= -40°C
A
T
A
= 0°C
-10
-20
3.0
3.5
4.0
4.5
5.0
5.5
-40
-10
20
50
80
110
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
OUTPUT VOLTAGE
vs. RTD RESISTANCE
0
5
4
3
2
1
0
T
A
= 25°C
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.01
0.10
1.00
10.00 100.00 1000.00
100
300
500
700
900
FREQUENCY (kHz)
RTD RESISTANCE (Ω)
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Pin Description
PIN
1
NAME
FUNCTION
V
Power-Supply Input. Bypass to GND with a 0.1µF capacitor as close to V
Sense Resistor 2 Negative Input
Sense Resistor 2 Positive Input
as possible.
CC
CC
2
RS2-
RS2+
RS1+
RS1-
GND
3
4
Sense Resistor 1 Positive Input
5
Sense Resistor 1 Negative Input
Ground
6
7
DG1
OUT1
OUT2
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.
8
9
10
—
DG2
EP
Functional Block Diagram
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 discrete
components. The Pt RTD resistance conveys tempera-
ture information approximated by the Callendar-Van
Dusen equation and is represented in Figure 1:
V
CC
V
CC
MAX6603
R
SRC
RS1+
RS1-
2
3
R(T) = R [1 + AT + BT + CT ]
O
ESD
CLAMP
OUT1
AMP
where: R(T) = Resistance of Pt RTD at temperature (T)
R = Base resistance in ohms at 0°C
0
T = Temperature in °C
ESD
CLAMP
I
EXC
-1
A = 3.9083 E-3 °C (alpha coefficient 1)
FAULT
DETECT
DG1
-2
B = -5.7750 E-7 °C (alpha coefficient 2)
HI-V
DETECT
C = 0 (approximation for temperatures > 0°C)
V
CC
(Alpha coefficients can vary depending on
standards.)
R
SRC
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.
RS2+
RS2-
ESD
CLAMP
The excitation current (I
by 0.2mA/V (typ) with respect to V , 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
) typically varies ratiometrically
EXC
OUT2
AMP
CC
ESD
CLAMP
I
EXC
FAULT
DETECT
DG2
HI-V
DETECT
use V
as their reference voltage, sudden changes in the
CC
supply voltage do not affect the microcontroller’s reading
of the temperature. Ratiometricity simplifies the connec-
tion to most microcontrollers that incorporate an ADC and
GND
Maxim Integrated
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
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 temperature
results in R(T) = 900Ω.
200Ω Pt RTD
1000
900
800
700
600
500
400
300
200
100
0
Input Overvoltage Protection to +16V
The input pins RS1+, RS1-, RS2+, and RS2- protect the
MAX6603 from overvoltage conditions up to +16V without
damaging the device.
Diagnostic Outputs (DG1, DG2)
The MAX6603 continuously monitors the excitation cur-
rent 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 respec-
tive DG output asserts low. OUT1 and OUT2 are high
impedance on assertion of DG1 and DG2, respectively.
An example circuit showing potential fault conditions is
shown in Figure 2.
0
200
400
600
800
1000
TEMPERATURE (°C)
Figure 1. Typical 200Ω Pt RTD Representation by the
Simplified Callender-Van Dusen Equation
enables a low-cost, low-complexity solution. Ratiometricity
is an important consideration for battery-operated
instruments 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
900W, covering a -40°C to +1000°C temperature range.
When R(T) goes too low or too high, a fault condition is
asserted and the respective DG_ goes low.
Applications Information
Ratiometric Output Coupled to a
Microcontroller
The circuit of Figure 3 shows the MAX6603 connected to
the microcontroller using V
as the ADC reference volt-
CC
age. The output is ratiometric to V , and temperature
measurements are independent of the supply voltage.
CC
Output Voltage
The following equation describes the output voltage:
Chip Information
PROCESS: BiCMOS
V
×R(T)
CC
V
=
OUT
1000
where:
V
= supply voltage
CC
R(T) = RTD resistance given by Callendar-
Van Dusen equation.
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
+5V
5kV ESD
0.1µF
0.1µF
V
CC
V
CC
ADC-REF
V
CC
MAX6603
SHORT TO BAT
(16V)
R
SRC
OPEN
SHORT TO GND
RS1+
RS1-
ESD
CLAMP
OUT1
ADC1
AMP
RTD SENSOR
OPEN
ESD
CLAMP
I
EXC
SHORT TO BAT
(16V)
SHORT TOGETHER
DG1
FAULT
DETECT
CHASSIS GND
INPUT1
SHORT TO GND
HI-V
DETECT
V
CC
MICROCONTROLLER
R
SRC
RS2+
ESD
CLAMP
OUT2
ADC2
AMP
RS2-
ESD
CLAMP
I
EXC
DG2
FAULT
DETECT
INPUT2
HI-V
DETECT
GND
Figure 2. The various fault conditions that cause the diagnostic output to assert low are shown for a single channel.
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
+5V
0.1µF
0.1µF
V
CC
ADC-REF
V
CC
MAX6603
R
SRC
RS1+
RS1-
ESD
CLAMP
OUT1
ADC1
AMP
Pt RTD PROBE
ESD
CLAMP
I
EXC
CONNECTOR
DG1
FAULT
DETECT
INPUT1
HI-V
DETECT
V
CC
MICROCONTROLLER
R
SRC
RS2+
RS2-
ESD
CLAMP
OUT2
ADC2
AMP
Pt RTD PROBE
ESD
CLAMP
I
CONNECTOR
EXC
DG2
FAULT
DETECT
INPUT2
HI-V
DETECT
GND
Figure 3. A Typical Application Circuit with Ratiometric Output Coupled to Ratiometric Microcontroller ADC
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE OUTLINE
LAND
PATTERN NO.
CODE
NO.
10 TDFN
T1033+1
21-0137
90-0003
Maxim Integrated
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MAX6603
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1
4/06
4/14
Initial release
—
1
No /V OPNs; removed Automotive reference from Applications section
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
│ 9
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