STLM20
Ultra-low Current 2.4V precision analog temperature sensor
Preliminary Data
Feature summary
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Precision analog voltage output temperature
sensor
±1.5°C temperature accuracy at 25°C
Ultra-low quiescent supply current: 8.0µA
(max)
Operating voltage range: 2.4V to 5.5V
Operating temperature range:
–55°C to 130°C (grade - 7)
–40°C to 85°C (grade - 9)
SOT323-5 (SC70-5) 5-lead package
UDFN 4-lead package
SOT323-5, SC70-5 (W8)
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Applications
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Third generation (3G) cell phones
Multimedia PDA devices
GPS devices
Portable medical instruments
Voltage-controlled crystal oscillator
temperature monitors
RF Power transistor monitor
UDFN 4 Lead (DD)
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October 2006
Rev 6
1/17
www.st.com
1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
Contents
STLM20
Contents
1
2
3
4
5
6
7
8
9
Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transfer function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Capacitive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
STLM20
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
First order equations optimized for different temperature ranges . . . . . . . . . . . . . . . . . . . . . 7
Quadratic output equation (V
CC
= 2.7V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Quadratic output equation for operations over the whole voltage range
(V
CC
= 2.4V to 5.5V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Resistor/capacitor combinations for the filter network . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
SOT323-5 – 5-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 13
UDFN - 4 lead mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3/17
List of figures
STLM20
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Filter network for noisy environments or capacitive loads > 300pF . . . . . . . . . . . . . . . . . . 11
V
OUT
vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
SOT323-5 – 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 13
UDFN – 4-lead package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4/17
STLM20
Summary description
1
Summary 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 2.4V to
5.5V. The accuracy of the STLM20 is ± 1.5°C, at an ambient temperature of 25°C. 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 2.7V to 5.5V, the temperature range
extremes are +130°C and –55°C. Decreasing the power supply voltage to 2.4V changes the
negative extreme to –30°C, while the positive remains at +130°C.
The STLM20 has a maximum quiescent supply current of 8µA. Therefore, self-heating is
negligible.
Figure 1.
Logic diagram
VCC
STLM20
VOUT
GND
(1)
AI12252
1. Pin 2 GND may be grounded or left floating (SC70-5 only). For optimum thermal conductivity to the PC
board ground plane, it should be grounded.
Table 1.
V
CC
GND
V
OUT
NC
Signal names
Supply voltage
Ground
Output voltage
No connect
5/17
Microcontroller MCU
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