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PDF TCN75 Data sheet ( Hoja de datos )
| Número de pieza | TCN75 | |
| Descripción | 2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR | |
| Fabricantes | TelCom Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TCN75 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
PRELIMINARY INFORMATION
TTCCNN755
2-WIRE SERIAL TEMPERATURE SENSOR AND THERMAL MONITOR
FEATURES
s Solid State Temperature Sensing; 2°C Accuracy (Typ.)
s Operates from – 55°C to +125°C
s Operating Range ..................................... 2.7V - 5.5V
s Programmable Trip Point and Hysteresis with
Power-up Defaults
s Standard 2-Wire Serial Interface
s Thermal Event Alarm Output Functions as
Interrupt or Comparator / Thermostat Output
s Up to 8 TCN75's May Share the Same Bus
s Shutdown Mode for Low Standby Power
Consumption
s Low Power ......................... 250µA (Typ.) Operating
1µA (Typ.) Shutdown Mode
s 8-Pin Plastic DIP, SOIC, and MSOP Packaging
TYPICAL APPLICATIONS
s Thermal Protection for High Performance CPU's
s Solid-State Thermometer
s Fire/Heat Alarms
s Thermal Management in Electronic Systems:
Computers
Telecom Racks
Power Supplies / UPS* / Amplifiers
s Copiers / Office Electronics
s Consumer Electronics
s Process Control
GENERAL DESCRIPTION
The TCN75 is a serially programmable temperature
sensor that notifies the host controller when ambient tem-
FUNCTIONAL BLOCK DIAGRAM
Temp
Sensor
VDD
9 Bit
∆Σ
A/D
Converter
Control
Logic
Register Set
Configuration
Temperature
TSET
THYST
INT/CMPTR
SDA
SCL
A0
A1
A2
Two Wire
Serial Port
Interface
TCN75
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.
ORDERING INFORMATION
Part No.
Supply
Voltage (V) Package
Junction
Temp. Range
TCN75-3.3MOA
TCN75-5.0MOA
TCN75-3.3MPA
TCN75-5.0MPA
TCN75-3.3MUA
TCN75-5.0MUA
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
– 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
PIN CONFIGURATIONS
8-Pin Plastic DIP
SDA 1
SCL 2
8 VDD
7 A0
INT/CMPTR 3
GND 4
SDA 1
SCL 2
INT/CMPTR 3
GND 4
TCN75MPA
8-Pin SOIC
TCN75MOA
6 A1
8-Pin MSOP
5 A2
SDA 1
8 VDD
SCL 2
INT/CMPTR 3
TCN75MUA
7 A0
6 A1
8 VDD
GND 4
5 A2
7 A0
6 A1
5 A2
TCN75-04 6/16/97 TelCom Semiconductor reserves the right to make changes in the circuitry and specifications of its devices1.
1 page  
2-WIRE SERIAL TEMPERATURE
SENSOR AND THERMAL MONITOR
PRELIMINARY INFORMATION
Address Byte
Immediately following the Start Condition, the host must
next transmit the address byte to the TCN75. The four most
significant bits of the Address Byte (A6, A5, A4, A3) are fixed
to 1001(B). The states of A2, A1 and A0 in the serial bit
stream must match the states of the A2, A1 and A0 address
inputs for the TCN75 to respond with an Acknowledge
(indicating the TCN75 is on the bus and ready to accept
data). The eighth bit in the Address Byte is a Read-Write Bit.
This bit is a 1 for a read operation or 0 for a write operation.
Acknowledge (ACK)
Acknowledge (ACK) provides a positive handshake
between the host and the TCN75. The host releases SDA
after transmitting eight bits then generates a ninth clock
cycle to allow the TCN75 to pull the SDA line LOW to
acknowledge that it successfully received the previous eight
bits of data or address.
Data Byte
After a successful ACK of the address byte, the host
must next transmit the data byte to be written or clock out the
data to be read. (See the appropriate timing diagrams.) ACK
will be generated after a successful write of a data byte into
the TCN75.
Stop Condition (STOP)
Communications must be terminated by a stop condi-
tion (a LOW to HIGH transition of SDA while SCL is HIGH).
The Stop Condition must be communicated by the transmit-
ter to the TCN75.
Power Supply
To minimize temperature measurement error, the
TCN75VO_-3 is factory calibrated at a supply voltage of
3.3V ±5V and the TCN75CO_-5 is factory calibrated at a
supply voltage of 5V ±5%. Either device is fully operational
TCN75
over the power supply voltage range of 2.7V to 5.5V, but
with a lower measurement accuracy. Figure 2 shows the
worst case temperature measurement error for the
TCN75CO_-3 operated at a power supply voltage of 5V ±
10%. Figure 3 shows the worst case temperature measure-
ment error for the TCN75CO_-3 operated at a power supply
voltage of 3.3V ±10%.
±5
±4
±3
±2
±1
20
35 50 65 80 95
TCN75 Case Temeprature (°C)
110 125
Figure 2. TCN75CO_-3 Measurement Error at VDD = 5V ± 10%
±5
±4
±3
±2
Address
A0
(Set as Desired) A1
A2
I2C Interface SDA
SCL
+VDD (3V to 5.5V)
CBypass
0.1µF Recommended
Unless Device is Mounted
Close to CPU
8
7
6
5
TCN75
3
TO PROCESSOR
INT/CMPTR
1
2
4
±1
20
35 50 65 80 95
TCN75 Case Temeprature (°C)
110 125
Figure 3. TCN75CO_-5 Measurement Error at VDD = 3.3V ± 10%
TCN75-04 6/16/97
Figure 1. Typical Application
5
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