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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 | Microchip | |
| Logotipo |  |
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TCN75
2-Wire Serial Temperature Sensor and Thermal Monitor
Features:
• Solid-State Temperature Sensing:
0.5°C Accuracy (Typ.)
• Operates from -55°C to +125°C
• Operating Supply Range: 2.7V to 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 TCN75s may Share the Same Bus
• Shutdown Mode for Low Standby Power
Consumption
• 5V Tolerant I/O at VDD = 3V
• Low Power:
- 250 μA (Typ.) Operating
- 1 μA (Typ.) Shutdown Mode
• 8-Pin SOIC and MSOP Packaging
Applications:
• Thermal Protection for High-Performance CPUs
• 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
Package Type
SOIC
SDA 1
SCL 2
INT/CMPTR 3
GND 4
8 VDD
7 A0
TCN75MOA
6 A1
5 A2
MSOP
SDA 1
SCL 2
INT/CMPTR 3
GND 4
8 VDD
7 A0
TCN75MUA
6 A1
5 A2
General Description:
The TCN75 is a serially programmable temperature
sensor that notifies the host controller when ambient
temperature exceeds a user programmed set point.
Hysteresis is also programmable. The INT/CMPTR
output is programmable as either a simple comparator
for thermostat operation 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 set point and
hysteresis, and configuring the device.
The TCN75 powers up in Comparator mode with a
default set point of 80°C with 5°C hysteresis. Defaults
allow independent operation as a stand-alone
thermostat. A shutdown command may be sent via the
2-wire bus to activate the low-power Standby mode.
Address selection inputs allow up to eight TCN75s to
share the same 2-wire bus for multizone 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.
© 2006 Microchip Technology Inc.
DS21490C-page 1
1 page  
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin Number
(8-Pin SOIC)
8-Pin MSOP)
1
2
3
4
5
6
7
8
Symbol
SDA
SCL
INT/CMPTR
GND
A2
A1
A0
VDD
Description
Bidirectional Serial Data.
Serial Data Clock Input.
Interrupt or Comparator Output.
System Ground.
Address Select Pin (MSB).
Address Select Pin.
Address Select Pin (LSB).
Power Supply Input.
TCN75
© 2006 Microchip Technology Inc.
DS21490C-page 5
5 Page 
TCN75
TABLE 5-3: TEMPERATURE (TEMP) REGISTER, 16 BITS, READ ONLY
The binary value in this register represents ambient temperature following a conversion cycle.
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7 D6 D5 D4 D3 D2 D1 LSB X X X X X X X
TABLE 5-4: TEMPERATURE SET POINT (TSET) REGISTER, 16 BITS, READ/WRITE
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7 D6 D5 D4 D3 D2 D1 LSB X X X X X X X
TABLE 5-5: HYSTERESIS (THYST) REGISTER, 16 BITS, READ/WRITE
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB D7 D6 D5 D4 D3 D2 D1 LSB X X X X X X X
In the TEMP, TSET, and THYST registers, each unit
value represents one-half degree (Celsius). The value
is in 2’s – complement binary format such that a read-
ing of 000000000b corresponds to 0°C. Examples of
this temperature to binary value relationship are shown
in Table 5-6.
TABLE 5-6: TEMPERATURE TO DIGITAL
VALUE CONVERSION
Temperature Binary Value
HEX Value
+125°C
+25°C
+0.5°C
0°C
0.5°C
-25°C
-40°C
-55°C
0 11111010
0 00110010
0 00000001
0 00000000
1 11111111
1 11001110
1 10110000
1 10010010
0FA
032
001
00
1FF
1CE
1B0
192
TABLE 5-7:
Name
TEMP
TSET
THYST
POINT
CONFIG
TCN75’S REGISTER SET SUMMARY
Description
Width Read
Ambient Temperature
Temperature Setpoint
Temperature Hysteresis
Register Pointer
Configuration Register
16
16
16
8
8
X
X
X
X
X
Write
X
X
X
X
Notes
2’s Complement Format
2’s Complement Format
2’s Complement Format
© 2006 Microchip Technology Inc.
DS21490C-page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TCN75.PDF ] | |
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