2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
PRELIMINARY INFORMATION
TCN75
TCN75
2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR
FEATURES
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Solid State Temperature Sensing; 2
°
C Accuracy (Typ.)
Operates from – 55
°
C to +125
°
C
Operating Range ..................................... 2.7V - 5.5V
Programmable Trip Point and Hysteresis with
Power-up Defaults
Standard 2-Wire Serial Interface
Thermal Event Alarm Output Functions as
Interrupt or Comparator / Thermostat Output
Up to 8 TCN75's May Share the Same Bus
Shutdown Mode for Low Standby Power
Consumption
Low Power ......................... 250
µ
A (Typ.) Operating
1
µ
A (Typ.) Shutdown Mode
8-Pin Plastic DIP, SOIC, and MSOP Packaging
perature exceeds a user-programmed setpoint. Hysteresis
is also programmable. The INT/CMPTR output is program-
mable as either a simple comparator for thermostat opera-
tion or as a temperature event interrupt. Communication
with the TCN75 is accomplished via a two-wire bus that is
compatible with industry standard protocols. This permits
reading the current temperature, programming the setpoint
and hysteresis, and configuring the device.
The TCN75 powers up in Comparator Mode with a
default setpoint of 80°C with 5°C hysteresis. Defaults allow
independent operation as a stand-alone thermostat. A shut-
down command may be sent via the 2-wire bus to activate
the low-power standby mode. Address selection inputs
allow up to eight TCN75's to share the same 2-wire bus for
multi-zone monitoring.
All registers can be read by the host and the INT/
CMPTR output's polarity is user programmable. Both polled
and interrupt driven systems are easily accommodated.
Small physical size, low installed cost, and ease of use make
the TCN75 an ideal choice for implementing sophisticated
system management schemes.
TYPICAL APPLICATIONS
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Thermal Protection for High Performance CPU's
Solid-State Thermometer
Fire/Heat Alarms
Thermal Management in Electronic Systems:
Computers
Telecom Racks
Power Supplies / UPS* / Amplifiers
Copiers / Office Electronics
Consumer Electronics
Process Control
ORDERING INFORMATION
Part No.
TCN75-3.3MOA
TCN75-5.0MOA
TCN75-3.3MPA
TCN75-5.0MPA
TCN75-3.3MUA
TCN75-5.0MUA
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Supply
Voltage (V) Package
3.3
5.0
3.3
5.0
3.3
5.0
8-Pin SOIC
8-Pin SOIC
8-Pin PDIP
8-Pin PDIP
8-MSOP
8-MSOP
Junction
Temp. Range
– 55°C to +125°C
– 55°C to +125°C
– 55°C to +125°C
– 55°C to +125°C
– 55°C to +125°C
– 55°C to +125°C
GENERAL DESCRIPTION
The TCN75 is a serially programmable temperature
sensor that notifies the host controller when ambient tem-
FUNCTIONAL BLOCK DIAGRAM
INT/CMPTR
9 Bit
∆Σ
A/D
Converter
Temp
Sensor
PIN CONFIGURATIONS
8-Pin Plastic DIP
SDA
Control
Logic
1
2
3
4
8
7
V
DD
A0
A1
A2
SDA 1
SCL 2
SCL
INT/CMPTR
TCN75MPA
6
5
8-Pin MSOP
8
7
TCN75MUA
6
5
V
DD
A0
A1
A2
V
DD
Register Set
Configuration
Temperature
T
SET
T
HYST
GND
8-Pin SOIC
SDA
SCL
A
0
A
1
A
2
Two Wire
Serial Port
Interface
INT/CMPTR 3
8
7
V
DD
A0
A1
A2
GND 4
SDA
SCL
TCN75
1
2
3
4
TCN75MOA
INT/CMPTR
GND
6
5
TCN75-04 6/16/97
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TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
