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TC07CUA Datasheet(PDF) 2 Page - TelCom Semiconductor, Inc

Part # TC07CUA
Description  3V LOGIC OUTPUT TEMPERATURE SENSOR WITH PROGRAMMABLE HYSTERESIS
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Manufacturer  TELCOM [TelCom Semiconductor, Inc]
Direct Link  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC07CUA Datasheet(HTML) 2 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
* 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.
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage .............................................................. 7V
Input Voltage Any Input ...... (GND – 0.3V) to (VDD + 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
DETAILED DESCRIPTION
The TC07 programs with resistors connected from the
TSET and HSET inputs to VDD. Output pins OUT and OUT are
driven active when temperature exceeds the setting deter-
mined by the programming resistor on TSET. The outputs are
maintained (latched) in their active states until temperature
drops below the setting determined by the programming
resistor on HSET (Figure 1).
Figure 1. TC07 Output Waveforms
TEMPERATURE
OUT
TEMPERATURE SET BY
RESISTOR ON TSET
HYSTERESIS SET BY
RESISTOR ON HSET
OUT
APPLICATIONS
Trip Point Programming
The resistor values required to achieve the desired
trip-point temperatures on TSET and HSET are calculated
using the formula below:
RTRIP = 0.6 x T 2.13
Where:
RTRIP
= Programming resistor value in Ohms
T
= Desired trip point temperature in degrees
Kelvin.
For example, to program the TC07 outputs to go active
at 50
°C and inactive at 30°C, the TSET and HSET program-
ming resistors are calculated as follows:
TSET = 0.6 x ((50 + 273.15)2.13) = 132.8kΩ
HSET = 0.6 x ((30 + 273.15)2.13) = 115.9kΩ
Resistance values for TSET and HSET can be approxi-
mated using Figure 2. Care must be taken to ensure the
HSET programming resistor is a smaller value than the TSET
programming resistor. The temperature programmed on
HSET must be at least 5°C lower than the temperature value
programmed by TSET. That is: HSET ≤ TSET – 5°C.
ELECTRICAL CHARACTERISTICS: TA = Over Operational Temperature Range, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD
Supply Voltage Range
2.7
5.5
V
IDD
Supply Current
2.7V < VCC < 5.5V
130
300
µA
VOH
Output Voltage (High)
IOUT = 500µA
0.8 x VDD
——
V
VOL
Output Voltage (Low)
IOUT = 1mA
0.25 x VDD
V
H
Minimum Hysteresis
HSET < TSET
– 5
°C
TSET
Absolute Accuracy
T = Programmed Temperature
T – 3
T
± 1
T + 3
°C
HSET
Absolute Accuracy
T = Programmed Temperature
T – 5
T
± 1
T + 5
°C
TC07
3V LOGIC OUTPUT TEMPERATURE
SENSOR WITH PROGRAMMABLE
HYSTERESIS


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