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Low-Voltage Analog Temperature
Sensor in an SC70 Package
Table 1. Linear and Quadratic Output Equation
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V CC = 2.7V, T A = -55°C
V CC = 2.7V, T A = -20°C
0.6
-0.4
7.9
+5.8
Temperature Error
V CC = 2.7V, T A = 0°C
-0.9
+4.5
Based on:
OUT = 1.8639 - 0.0115 x Temp
(Note 4)
Temperature Error
Based on:
OUT = 1.8639 - 0.0115 x Temp -
0.00000388 x Temp 2 (Note 4)
V CC = 2.7V, T A = +50°C
V CC = 2.7V, T A = +85°C
V CC = 2.7V, T A = +100°C
V CC = 2.7V, T A = +125°C
V CC = 2.7V, T A = +130°C
V CC = 2.7V, T A = -55°C
V CC = 2.7V, T A = -20°C
V CC = 2.7V, T A = 0°C
V CC = 2.7V, T A = +50°C
V CC = 2.7V, T A = +85°C
V CC = 2.7V, T A = +100°C
V CC = 2.7V, T A = +125°C
V CC = 2.7V, T A = +130°C
-2.6
-3.6
-4.0
-4.8
-5.1
-0.4
-0.6
-0.9
-3.5
-6.1
-7.4
-10.1
-10.8
+3.0
+3.5
+3.7
+4.2
+4.2
+6.9
+5.7
+4.5
+2.1
+1.0
+0.4
-1.0
-1.5
°C
°C
Detailed Description
The MAX6613 analog output temperature sensor’s out-
put voltage is a discrete function of its die temperature.
The maximum supply current is 13μA, and the supply
voltage range is from 2.5V to 5.5V for the -55°C to
+130°C temperature range, or 1.8V to 5.5V for the
+25°C to +130°C temperature range.
Transfer Function
The temperature-to-voltage transfer function is approxi-
mately linear and can be described by the quadratic
equation:
V OUT = -0.0000022 ? T 2 - 0.01105 ? T + 1.8455V
In many cases, a linear approximation can be applied:
V OUT = -0.01123 ? T + 1.8455V
where T is the die temperature of the MAX6613 in °C.
Therefore:
T = (1.8455 - V OUT ) / 0.01123V
Compatibility with Other Temperature
Sensors
The MAX6613 can be used to replace temperature sen-
sors using other output algorithms. Table 1 provides
information for a linear and quadratic output equation.
Contact the factory for performance information about
another equation.
4
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