Max6613, Detailed description, Table 1. linear and quadratic output equation – Rainbow Electronics MAX6613 User Manual
Page 4
MAX6613
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 = (V
OUT
- 1.8455) / 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.
Low-Voltage Analog Temperature
Sensor in an SC70 Package
4
_______________________________________________________________________________________
Table 1. Linear and Quadratic Output Equation
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
= 2.7V, T
A
= -55°C
2.06
6.57
V
CC
= 2.7V, T
A
= -40°C
1.19
5.73
V
CC
= 2.7V, T
A
= -20°C
0.55
4.36
V
CC
= 2.7V, T
A
= 0°C
0.35
2.85
V
CC
= 2.7V, T
A
= +20°C
-0.37
+2.15
V
CC
= 2.7V, T
A
= +40°C
-1.32
+1.61
V
CC
= 2.7V, T
A
= +60°C
-2.02
+1.92
V
CC
= 2.7V, T
A
= +85°C
-2.32
+1.66
V
CC
= 2.7V, T
A
= +100°C
-2.78
+2.01
V
CC
= 2.7V, T
A
= +125°C
-3.11
+2.54
Temperature Error
Based on:
OUT = 1.8639 - 0.0115
✕
Temp
(Note 4)
V
CC
= 2.7V, T
A
= +130°C
-3.37
+2.90
°C
V
CC
= 2.7V, T
A
= -55°C
1.08
5.76
V
CC
= 2.7V, T
A
= -40°C
0.67
5.33
V
CC
= 2.7V, T
A
= -20°C
0.42
4.28
V
CC
= 2.7V, T
A
= 0°C
0.35
2.85
V
CC
= 2.7V, T
A
= +20°C
-0.49
+1.99
V
CC
= 2.7V, T
A
= +30°C
-0.95
+1.53
V
CC
= 2.7V, T
A
= +40°C
-1.81
+1.05
V
CC
= 2.7V, T
A
= +50°C
-1.93
+0.54
V
CC
= 2.7V, T
A
= +60°C
-3.11
+0.67
V
CC
= 2.7V, T
A
= +85°C
-4.51
-0.74
V
CC
= 2.7V, T
A
= +100°C
-5.77
-1.28
V
CC
= 2.7V, T
A
= +125°C
-7.74
-2.52
Temperature Error
Based on:
OUT = 1.8639 - 0.0115
✕
Temp -
0.00000388
✕
Temp
2
(Note 4)
V
CC
= 2.7V, T
A
= +130°C
-8.35
-2.58
°C