3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS
TC07
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage ..............................................................7V
Input Voltage Any Input ...... (GND – 0.3V) to (V
DD
+ 0.3V)
Operating Temperature ......................... – 40°C to +125°C
Maximum Chip Temperature ................................. +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
* Stresses above those listed under "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions above
those indicated in the operation sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
ELECTRICAL CHARACTERISTICS:
T
A
= Over Operational Temperature Range, unless otherwise specified.
Symbol
V
DD
I
DD
V
OH
V
OL
H
T
SET
H
SET
Parameter
Supply Voltage Range
Supply Current
Output Voltage (High)
Output Voltage (Low)
Minimum Hysteresis
Absolute Accuracy
Absolute Accuracy
Conditions
2.7V < V
CC
< 5.5V
I
OUT
= 500µA
I
OUT
= 1mA
H
SET
< T
SET
T = Programmed Temperature
T = Programmed Temperature
Min
2.7
—
0.8 x V
DD
—
–5
T–3
T–5
Typ
—
130
—
—
—
T
±
1
T
±
1
Max
5.5
300
—
0.25 x V
DD
—
T+3
T+5
Unit
V
µA
V
V
°C
°C
°C
DETAILED DESCRIPTION
The TC07 programs with resistors connected from the
T
SET
and H
SET
inputs to V
DD
. Output pins OUT and OUT are
driven active when temperature exceeds the setting deter-
mined by the programming resistor on T
SET
. The outputs are
maintained (latched) in their active states until temperature
drops below the setting determined by the programming
resistor on H
SET
(Figure 1).
APPLICATIONS
Trip Point Programming
The resistor values required to achieve the desired
trip-point temperatures on T
SET
and H
SET
are calculated
using the formula below:
R
TRIP
= 0.6 x T
2.13
Where:
R
TRIP
T
TEMPERATURE
= Programming resistor value in Ohms
= Desired trip point temperature in degrees
Kelvin.
TEMPERATURE SET BY
RESISTOR ON T
SET
HYSTERESIS SET BY
RESISTOR ON H
SET
For example, to program the TC07 outputs to go active
at 50°C and inactive at 30°C, the T
SET
and H
SET
program-
ming resistors are calculated as follows:
T
SET
= 0.6 x ((50 + 273.15)
2.13
) = 132.8kΩ
H
SET
= 0.6 x ((30 + 273.15)
2.13
) = 115.9kΩ
Resistance values for T
SET
and H
SET
can be approxi-
mated using Figure 2. Care must be taken to ensure the
H
SET
programming resistor is a smaller value than the T
SET
programming resistor. The temperature programmed on
H
SET
must be at least 5°C lower than the temperature value
programmed by T
SET
. That is: H
SET
≤
T
SET
– 5°C.
TELCOM SEMICONDUCTOR, INC.
OUT
OUT
Figure 1. TC07 Output Waveforms
2-12
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
