TMP01 Datasheet, PDF (1/16 Pages) Analog Devices – Low Power, Programmable Temperature Controller

a
Low Power, Programmable
Temperature Controller
TMP01*
FEATURES
–55؇C to +125؇C (–67؇F to +257؇F) Operation
؎1.0؇C Accuracy Over Temperature (typ)
Temperature-Proportional Voltage Output
User Programmable Temperature Trip Points
User Programmable Hysteresis
20 mA Open Collector Trip Point Outputs
TTL/CMOS Compatible
Single-Supply Operation (4.5 V to 13.2 V)
Low Cost 8-Pin DIP and SO Packages
APPLICATIONS
Over/Under Temperature Sensor and Alarm
Board Level Temperature Sensing
Temperature Controllers
Electronic Thermostats
Thermal Protection
HVAC Systems
Industrial Process Control
Remote Sensors
GENERAL DESCRIPTION
The TMP01 is a temperature sensor which generates a voltage
output proportional to absolute temperature and a control signal
from one of two outputs when the device is either above or
below a specific temperature range. Both the high/low tempera-
ture trip points and hysteresis (overshoot) band are determined
by user-selected external resistors. For high volume production,
these resistors are available on-board.
The TMP01 consists of a bandgap voltage reference combined
with a pair of matched comparators. The reference provides
both a constant 2.5 V output and a voltage proportional to abso-
lute temperature (VPTAT) which has a precise temperature co-
efficient of 5 mV/K and is 1.49 V (nominal) at +25°C. The
comparators compare VPTAT with the externally set tempera-
ture trip points and generate an open-collector output signal
when one of their respective thresholds has been exceeded.
*Protected by U.S. Patent No. 5,195,827.
FUNCTIONAL BLOCK DIAGRAM
VREF
1
2.5V
TEMPERATURE
SENSOR & ^SENSOR
VOLTAGE
8 V+
R1
REFERENCE
SET ₂
HIGH
R2
SET
LOW
3
WINDOW
COMPARATOR
7 OVER
6 UNDER
R3
GND 4
HYSTERESIS
GENERATOR
5 VPTAT
TMP01
Hysteresis is also programmed by the external resistor chain and
is determined by the total current drawn out of the 2.5 V refer-
ence. This current is mirrored and used to generate a hysteresis
offset voltage of the appropriate polarity after a comparator has
been tripped. The comparators are connected in parallel, which
guarantees that there is no hysteresis overlap and eliminates
erratic transitions between adjacent trip zones.
The TMP01 utilizes proprietary thin-film resistors in conjunc-
tion with production laser trimming to maintain a temperature
accuracy of ± 1°C (typ) over the rated temperature range, with
excellent linearity. The open-collector outputs are capable of
sinking 20 mA, enabling the TMP01 to drive control relays di-
rectly. Operating from a +5 V supply, quiescent current is only
500 µA (max).
The TMP01 is available in the low cost 8-pin epoxy mini-DIP
and SO (small outline) packages, and in die form.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1995
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