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STLM20DD9F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
List of figures STLM20
4/19 Doc ID 12495 Rev 13
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. Filter network for noisy environments or capacitive loads > 300 pF . . . . . . . . . . . . . . . . . . 10
Figure 4. V
OUT
vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 5. SOT323-5L – 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6. UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package outline . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 7. Carrier tape for SOT323-5L and UDFN-4L packages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8. Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
STLM20 Description
Doc ID 12495 Rev 13 5/19
1 Description
The STLM20 is a precision analog output temperature sensor for low current applications
where maximizing battery life is important. It operates over a –55 °C to 130 °C (grade 7) or
–40 °C to 85 °C (grade 9) temperature range. The power supply operating range is 2.4 V to
5.5 V. The maximum temperature accuracy of the STLM20 is ± 1.5 °C (±0.5 °C typ) at an
ambient temperature of 25 °C and V
CC
of 2.7 V. The temperature error increases linearly
and reaches a maximum of ±2.5 °C at the temperature range extremes. The temperature
range is affected by the power supply voltage. For the temperature grade 7 device, a power
supply voltage of 2.7 V to 5.5 V, the temperature range extremes are +130 °C and –55 °C
(decreasing the power supply voltage from 2.7 V to 2.4 V changes the low end of the
operating temperature range from –55 °C to –30 °C, while the positive remains at +130 °C).
The STLM20 has a maximum quiescent supply current of 8 µA. Therefore, self-heating is
negligible.
Figure 1. Logic diagram
1. Pin 2 GND may be grounded or left floating (SOT323-5L only). For optimum thermal conductivity to the PC
board ground plane, it should be grounded.
Figure 2. Connections (top view)
1. Pin 1 NC should be left floating or grounded.
2. Pin 2 GND may be grounded or left floating. For optimum thermal conductivity to the PC board ground
plane, it should be grounded.
Table 1. Signal names
V
CC
Supply voltage
GND Ground
V
OUT
Output voltage
NC No connect
AI12252
V
CC
STLM20
GND
(1)
V
OUT
1
V
CC
GND
(2)
NC
(1)
GND
V
OUT
AI12253
2
3
5
4
SOT323-5L
1
V
CC
NC
(1)
GND
V
OUT
AI12253_a
2
4
3
UDFN-4L
Transfer function STLM20
6/19 Doc ID 12495 Rev 13
2 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 (first order linear equation)
Over the specified operating temperature range, the best accuracy can be obtained by using
the parabolic transfer function:
Equation 2 (second order parabolic equation)
and solving for T:
The best fit linear transfer function for many popular temperature ranges was calculated in
Table 2 , where the error introduced by the linear transfer function increases with wider
temperature ranges.
Table 2. First order equations optimized for different temperature ranges
Temperature range
Linear equation
V
O
=
Maximum deviation of linear
equation from parabolic equation
(°C)
T
min
(°C) T
max
(°C)
–55 130 –11.79 mV/°C * T + 1.8528 V ±1.41
–40 110 –11.77 mV/°C * T + 1.8577 V ±0.93
–30 100 –11.77 mV/°C * T + 1.8605 V ±0.70
–40 85 –11.67 mV/°C * T + 1.8583 V ±0.65
–10 65 –11.71 mV/°C * T + 1.8641 V ±0.23
35 45 –11.81 mV/°C * T + 1.8701 V ±0.004
20 30 –11.69 mV/°C * T + 1.8663 V ±0.004
V
O
11.69mV–()°CT1.8663+×⁄ V=
8639.1)T1015.1(–)T1088.3(–V
2–26
O
+××+××=
−
()
6–
O
6
1088.3
V8639.1
101962.296.1481–T
×
−
+×+=
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

STLM20DD9F

Mfr. #:
Buy STLM20DD9F
Manufacturer:
STMicroelectronics
Description:
Board Mount Temperature Sensors 2.4V Analog
Lifecycle:
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