STLM20DD9F STMicroelectronics, STLM20DD9F Datasheet - Page 6

• Manufacturer Part Number: STLM20DD9F
• Description: Board Mount Temperature Sensors 2.4V Analog
• Manufacturer: STMicroelectronics

Specifications of STLM20DD9F

• Full Temp Accuracy: +/- 1.5 C
• Package / Case: UDFN-4
• Supply Voltage (max): 6.5 V
• Supply Voltage (min): - 0.2 V
• Gain: - 11.77 mV / C
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Output Type: Analog
• Supply Current: 8 uA
• Ic Output Type: Voltage
• Sensing Accuracy Range: ± 1.5°C
• Temperature Sensing Range: -40°C To +85°C
• Supply Voltage Range: 2.4V To 5.5V
• Sensor Case Style: UDFN
• No. Of Pins: 4
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Transfer function
2
6/19
Transfer function
The STLM20’s transfer function can be described in different ways, with varying levels of
precision. A simple linear transfer function, with good accuracy near 25 °C is expressed as:
Equation 1
Over the specified operating temperature range, the best accuracy can be obtained by using
the parabolic transfer function:
Equation 2
and solving for T:
The best fit linear transfer function for many popular temperature ranges was calculated in
Table
temperature ranges.
Table 2.
T
Temperature range
min
–55
–40
–30
–40
–10
35
20
2, where the error introduced by the linear transfer function increases with wider
(°C)
T
First order equations optimized for different temperature ranges
max
(first order linear equation)
(second order parabolic equation)
130
110
100
85
65
45
30
(°C)
V
O
=
(–
T
. 3
–11.79 mV/°C * T + 1.8528 V
–11.77 mV/°C * T + 1.8577 V
–11.77 mV/°C * T + 1.8605 V
–11.67 mV/°C * T + 1.8583 V
–11.71 mV/°C * T + 1.8641 V
–11.81 mV/°C * T + 1.8701 V
–11.69 mV/°C * T + 1.8663 V
=
88
V
–
Doc ID 12495 Rev 13
1481
O
×
Linear equation
10
=
.
−
– (
96
6
11.69mV
×
+
V
O
T
. 2
2
=
)
1962
+
(–
) °
⁄
. 1
×
C T
15
10
×
6
×
+
10
+
(
. 1
. 3
1.8663
–
8639
88
2
equation from parabolic equation
×
×
) T
Maximum deviation of linear
10
−
V
V
+
–
O
6
. 1
)
8639
±0.004
±0.004
±1.41
±0.93
±0.70
±0.65
±0.23
(°C)
STLM20