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STLM20DD9F-STLM20W87F
Ultra-low current 2.4 V precision analog temperature sensor
July 2010 Doc ID 12495 Rev 13 1/19
STLM20Ultra-low current 2.4 V precision analog temperature sensor
Features Precision analog voltage output temperature
sensor ±1.5 °C maximum temperature accuracy
at 25 °C (±0.5 °C typical) Ultra-low quiescent supply current:
4.8 µA (typ) and 8.0 µA (max) Operating voltage range: 2.4 V to 5.5 V Operating temperature range:
–55 °C to 130 °C (grade 7)
–40 °C to 85 °C (grade 9) SOT323-5L 5-lead package UDFN-4L 4-lead package
Applications Smartphones Multimedia PDA devices GPS devices Portable medical instruments Voltage-controlled crystal oscillator
temperature monitors RF power transistor monitor
Contents STLM202/19 Doc ID 12495 Rev 13
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
STLM20 List of tablesDoc ID 12495 Rev 13 3/19
List of tablesTable 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. First order equations optimized for different temperature ranges. . . . . . . . . . . . . . . . . . . . . 6
Table 3. Second order parabolic equation (VCC = 2.7 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. Second order parabolic equation for operation over the full voltage range
(VCC = 2.4 V to 5.5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 7. Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 8. SOT323-5L – 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . 13
Table 9. UDFN-4L – 4-lead (1.00 mm x 1.30 mm) package mechanical data . . . . . . . . . . . . . . . . . 14
Table 10. Carrier tape dimensions for SOT323-5L and UDFN-4L packages . . . . . . . . . . . . . . . . . . . 15
Table 11. Reel dimensions for 8 mm carrier tape - SOT323-5L and UDFN-4L packages . . . . . . . . . 16
Table 12. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 13. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
List of figures STLM204/19 Doc ID 12495 Rev 13
List of figuresFigure 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. VOUT 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 DescriptionDoc ID 12495 Rev 13 5/19
1 DescriptionThe 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 VCC 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 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) Pin 1 NC should be left floating or grounded. 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
Transfer function STLM206/19 Doc ID 12495 Rev 13
2 Transfer functionThe 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 rangesO 11.69mV– () °CT 1.8663+×⁄ V=
STLM20 Transfer functionDoc ID 12495 Rev 13 7/19
Table 3. Second order parabolic equation (VCC = 2.7 V)
Table 4. Second order parabolic equation for operation over the full voltage range
(VCC = 2.4 V to 5.5 V) VOUT tolerance is ±4% (temperature grade 9 only). Valid for VCC min = 2.7 V. Valid for temperature grade 7 only.
Maximum ratings STLM208/19 Doc ID 12495 Rev 13
3 Maximum ratingsStressing the device above the rating listed in the absolute maximum ratings table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 5. Absolute maximum ratings Reflow at peak temperature of 260 °C. The time above 255 °C must not exceed 30 seconds. Grade 7: STLM20W87F
Grade 9: STLM20DD9F
STLM20 DC and AC characteristicsDoc ID 12495 Rev 13 9/19
DC and AC characteristicsThis section summarizes the DC and AC characteristics of the device. The parameters in
the DC and AC characteristics table that follows are derived from tests performed under the
test conditions. Designers should check that the operating conditions in their circuit match
the operating conditions when relying on the quoted parameters.
Table 6. DC and AC characteristics Valid for ambient operating temperature: TA = –55 to 130 °C or TA = –40 to 85 °C; VCC = 2.7 V (except where noted). TJ = TA = 25 °C, unless otherwise noted under test condition. Accuracy is defined as the error between the measured and calculated output voltage at specified conditions of voltage,
current, and temperature. Positive load currents flow out of the device (sourcing) and can typically be 16 µA. For negative load currents (sinking), the
device can sink less than 1 µA. Over the supply range of 2.4 to 5.5 V. Measured at constant junction temperature, with pulse testing and low duty cycle. Output changes due to heating may be
calculated by multiplying internal dissipation by thermal resistance.
Capacitive load STLM2010/19 Doc ID 12495 Rev 13
5 Capacitive loadThe STLM20 will handle capacitive loads of up to 300 pF. Over the specified temperature
range, the STLM20 has a maximum output impedance of 160 Ω.
In a noisy environment, it may be advisable to add some filtering to minimize noise in the
output voltage. A 0.1 µF capacitor added between the supply voltage and ground is
recommended.
In an extremely noisy environment, it may be necessary to add a low-pass filter network to
the output of the device. A 1 µF capacitor, in addition to the output impedance of the device,
and a 200 Ω series resistor, will provide a low-pass filter that will pass the slow thermal time
constant of the STLM20, while filtering the higher frequency noise.
Figure 3. Filter network for noisy environments or capacitive loads > 300 pF Table 7. Resistor/capacitor combinations for the filter network
