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What is TMP125?

This electronic component, produced by the manufacturer "Burr-Brown Corporation", performs the same function as "2C Accurate Digital Temperature Sensor".


TMP125 Datasheet PDF - Burr-Brown Corporation

Part Number TMP125
Description 2C Accurate Digital Temperature Sensor
Manufacturers Burr-Brown Corporation 
Logo Burr-Brown Corporation Logo 


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TMP125
SBOS323 − DECEMBER 2004
2°C Accurate Digital Temperature Sensor
with SPIInterface
FEATURES
D DIGITAL OUTPUT: SPI-Compatible Interface
D RESOLUTION: 10-Bit, 0.25°C
www.DataSheet4UD.comACCURACY:
±2.0°C (max) from −25°C to +85°C
±2.5°C (max) from −40°C to +125°C
D LOW QUIESCENT CURRENT: 50µA (max)
D WIDE SUPPLY RANGE: 2.7V to 5.5V
D TINY SOT23-6 PACKAGE
D OPERATION FROM −40°C to +125°C
APPLICATIONS
D BASE STATION EQUIPMENT
D COMPUTER PERIPHERAL THERMAL
PROTECTION
D NOTEBOOK COMPUTERS
D DATA ACQUISITION SYSTEMS
D TELECOM EQUIPMENT
D OFFICE MACHINES
TMP125 RELATED PRODUCTS
FEATURES
2°C Digital Temp Sensors with Two-Wire Interface
1.5°C Digital Temp Sensors with Two-Wire Interface
1.5°C Digital Temp Sensors with SPI
1.5°C Programmable Digital Temp Sensors with SPI
PRODUCT
TMP100/101
TMP75/175
TMP121/123
TMP122/124
DESCRIPTION
The TMP125 is an SPI-compatible temperature sensor
available in the tiny SOT23-6 package. Requiring no
external components, the TMP125 is capable of
measuring temperatures within 2°C of accuracy over a
temperature range of −25°C to +85°C and 2.5°C of
accuracy over −40°C to +125°C. Low supply current, and
a supply range from 2.7V to 5.5V, make the TMP125 an
excellent candidate for low-power applications.
The TMP125 is ideal for extended thermal measurement
in a variety of communication, computer, consumer,
environmental, industrial, and instrumentation
applications.
Temperature
GND 1
Diode
Temp.
Sensor
Control
Logic
6 SO
SI 2
∆Σ
A/D
Converter
Serial
Interface
5 CS
V+ 3
OSC
Config.
and Temp.
Register
4 SCK
TMP125
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
SPI is a registered trademark of Motorola. All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2004, Texas Instruments Incorporated
www.ti.com

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TMP125 equivalent
TMP125
www.ti.com
APPLICATIONS
The TMP125 10-bit, read-only digital temperature sensor
is optimal for thermal management and thermal protection
applications. The TMP125 is specified for a temperature
range of −40°C to +125°C, with operation extending down
to −55°C. It is specified for a supply voltage range of 2.7V
to 5.5V, and also features a hardware shutdown to provide
power savings. Quiescent current is reduced to 1µA during
analog shutdown.
The TMP125 communicates through a serial interface that
is SPI-compatible. Temperature is converted to a 10-bit
www.DataSheet4Ud.caotam word with 0.25°C resolution. The TMP125 is optimal
for low power applications, with a 120ms conversion
period for reduced power consumption.
The sensing device of the TMP125 is the chip itself.
Thermal paths run through the package leads as well as
the plastic package, and the lower thermal resistance of
metal causes the leads to provide the primary thermal
path.
The TMP125 requires no external components for
operation, though a 0.1µF supply bypass capacitor is
recommended. Figure 1 shows typical connection for the
TMP125.
V+
SCK 4
3
2
SO 6 TMP125
5
1
0.1µF
SI
CS
Figure 1. Typical Connections for the TMP125
COMMUNICATING WITH THE TMP125
The TMP125 continuously converts temperatures to
digital data. Temperature data is read by pulling CS low.
Once CS is pulled low, temperature data from the last
completed conversion prior to dropping CS is latched into
SBOS323 − DECEMBER 2004
the shift register and clocked out at SO on the falling SCK
edge. The 16-bit data word is clocked out sign bit first,
followed by the MSB. Any portion of the 16-bit word can be
read before raising CS. However, all 16 bits must be
clocked to allow shutdown of the TMP125. The TMP125
typically requires 60ms to complete a conversion, with
results updated every 120ms.
The TMP125 will go into idle mode for 60ms, requiring only
20µA of current. A new conversion begins every 120ms.
Figure 2 describes the conversion timing for the TMP125.
TEMPERATURE REGISTER
The Temperature Register of the TMP125 is a 16-bit,
read-only register that stores the output of the most recent
conversion. However, temperature is represented by only
10-bits, which are in signed two’s complement format. The
first bit of the Temperature Register, D15, is a leading zero.
Bits D14 and D5 are used to indicate temperature. Bits D4
to D0 are the same as D5. (See Table 1.) Data format for
temperature is summaraized in Table 2. When calculating
the signed two’s complement temperature value, be sure
to use only the 10 data bits.
Following power-up or reset, the Temperature Register will
read 0°C until the first conversion is complete.
D15 D14 D13 D12 D11 D10
0 T9 T8 T7 T6 T5
D9
T4
D7 D6 D5 D4 D3 D2 D1
T2 T1 T0 T0 T0 T0 T0
Table 1. Temperature Register
D8
T3
D0
T0
TEMPERATURE
(°C)
DIGITAL OUTPUT
D14...D5
+127
01 1111 1100
+125
01 1111 0100
+100
01 1001 0000
+75 01 0010 1100
+50 00 1100 1000
+25 00 0110 0100
+10 00 0010 1000
+0.25
00 0000 0001
0 00 0000 0000
−0.25
11 1111 1111
−25 11 1001 1100
−50 11 0011 1000
−55 11 0010 0100
Table 2. Temperature Data Format
5


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1. - Accurate Digital Temperature Sensor

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