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What is TMP122AIDBVR?

This electronic component, produced by the manufacturer "Burr-Brown Corporation", performs the same function as "1.5C Accurate Programmable Digital Temperature Sensors with SPI Interface".


TMP122AIDBVR Datasheet PDF - Burr-Brown Corporation

Part Number TMP122AIDBVR
Description 1.5C Accurate Programmable Digital Temperature Sensors with SPI Interface
Manufacturers Burr-Brown Corporation 
Logo Burr-Brown Corporation Logo 


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TMP122
TMP124
SBOS272B – JUNE 2003 – REVISED DECEMBER 2003
1.5°C Accurate Programmable
Digital Temperature Sensors
with SPI™ Interface
FEATURES
q DIGITAL OUTPUT: SPI-Compatible Interface
q PROGRAMMABLE RESOLUTION:
9- to 12-Bits + Sign
q ACCURACY:
±1.5°C from –25°C to +85°C (max)
±2.0°C from –40°C to +125°C (max)
q LOW QUIESCENT CURRENT: 50µA
q WIDE SUPPLY RANGE: 2.7V to 5.5V
q TINY SOT23-6 AND SO-8 PACKAGES
q OPERATION TO 150°C
q PROGRAMMABLE HIGH/LOW SETPOINTS
APPLICATIONS
q POWER-SUPPLY TEMPERATURE MONITORING
q COMPUTER PERIPHERAL THERMAL PROTECTION
q NOTEBOOK COMPUTERS
q CELL PHONES
q BATTERY MANAGEMENT
q OFFICE MACHINES
q THERMOSTAT CONTROLS
q ENVIRONMENTAL MONITORING and HVAC
q ELECTROMECHANICAL DEVICE TEMPERATURE
Temperature
ALERT
1
Diode
Temp.
Sensor
Control
Logic
6 SO/I
GND
2 ∆Σ
A/D
Converter
Serial
Interface
5
CS
V+ 3
OSC
Config
and Temp
Register
4
SCK
DESCRIPTION
The TMP122 and TMP124 are SPI-compatible temperature
sensors available in SOT23-6 and SO-8 packages. Requir-
ing only a pull-up resistor for complete function, the TMP122
and TMP124 temperature sensors are capable of measuring
temperatures within 2°C of accuracy over a temperature
range of –40°C to +125°C, with operation up to 150°C.
Programmable resolution, programmable set points and shut
down function provide versatility for any application. Low
supply current and a supply range from 2.7V to 5.5V make
the TMP122 and TMP124 excellent candidates for low-
power applications.
The TMP122 and TMP124 are ideal for extended thermal
measurement in a variety of communication, computer, con-
sumer, environmental, industrial, and instrumentation appli-
cations.
Temperature
SO/I
1
Diode
Temp.
Sensor
SCK
2 ∆Σ
A/D
Converter
NC 3
GND
4
OSC
Control
Logic
8 V+
Serial
Interface
7
CS
Config
and Temp
Register
6
5
NC
ALERT
TMP122
TMP124
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.
www.ti.com
Copyright © 2003, Texas Instruments Incorporated

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TMP122AIDBVR equivalent
APPLICATIONS INFORMATION
The TMP122 and TMP124 digital temperature sensors are
optimal for thermal management and thermal protection appli-
cations. The TMP122/TMP124 are SPI interface-compatible
and specified for a temperature range of 40°C to +125°C.
The TMP122/TMP124 require minimal external components
for operation, needing only a pull-up resistor on the ALERT
pin and a bypass capacitor on the supply. Bypass capacitors
of 0.1µF is recommended. Figure 1 shows typical connec-
tions for the TMP122 and TMP124.
V+ V+
SCK 4
3
1
SO/I 6 TMP122
5
0.1µF
ALERT
(Output)
CS
SO/I
SCK
NC
2
GND
NOTE: Alert requires
pull-up resistor (open drain).
NC indicates pin should be left
open or floating.
8
17
26
TMP124
35
4
0.1µF
CS
NC
ALERT
(Output)
GND
FIGURE 1. Typical Connections of the TMP122 and TMP124.
To maintain accuracy in applications requiring air or surface
temperature measurement, care should be taken to isolate
the package and leads from ambient air temperature.
CS
SO/I
16-Bit
READ
16-Bit
READ
COMMAND
16-Bit
Response
16-Bit
WRITE/
Embedded
Address
16-Bit
READ
FIGURE 2.Multiple Command Sequence.
COMMUNICATING WITH THE TMP122
The TMP122/TMP124 converts continuously. If CS is brought
low during a conversion the conversion process continues, but
the last completed conversion is available at the output regis-
ter. Communication with the TMP122/TMP124 is initiated by
pulling CS low. The first 16 clocks of data transfer will return
temperature data from the temperature sensors. The 16-bit
data word is clocked out sign bit first, followed by the MSB. Any
portion of the 16-bit word may be read before raising CS . If the
user wishes to continue with CS low, the following 16 clocks
transfer in a READ or WRITE command. READ and WRITE
commands are described in Tables I and II.
The READ command contains an embedded address in bits
D4 and D3 to identify which register to read. Bits D4 and D3
are internally registered and will hold their value following a
READ command until a entire 16-bit read is completed by the
user. The completion of the 16-bit READ acknowledges that
the READ command has been completed. If the user issues
a READ command and then raises CS with less than 16
subsequent clocks, the data from that register will be available
at the next fall of CS . The registered READ address will
remain in effect until a full 16 clocks have been received. After
the completion of a 16-bit READ from the part, the READ
address is reset to return data from the Temperature Register.
A WRITE command to a register will not change the READ
address registered. For further discussion on the READ ad-
dress register, see the Read Address Register section.
Multiple commands may be strung together as illustrated in
Figure 2. The TMP122/TMP124 accepts commands alternat-
ing with 16-bit response data. On lowering CS , the part
always responds with a READ from the address location
indicated by the READ address register. If the next com-
mand is a READ command then data is returned from the
address specified by the READ command with the 16th clock
resetting the READ address register to the default tempera-
ture register. The TMP122/TMP124 then expect a 16-bit
command. If the command is a WRITE command, then the
16 clocks following the command will again return tempera-
ture data.
Figures 3, 4, 5, and 6 detail the communication sequences.
Read Command
Temperature
Configuration Register
Low Temp Threshold
High Temp Threshold
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
1 0 0 0 0 0 0 00 0 0 0 0 0 0 0
1 0 0 0 0 0 0 00 0 0 0 1 0 0 0
1 0 0 0 0 0 0 00 0 0 1 0 0 0 0
1 0 0 0 0 0 0 00 0 0 1 1 0 0 0
TABLE I. Read Command.
Write Command
Configuration Register
Low Temp Threshold
High Temp Threshold
Shutdown Command
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2
000
T12 T11 T10
T12 T11 T10
xxx
0
T9
T9
x
D1 D0 R1 R0 F1
T8 T7 T6 T5 T4
T8 T7 T6 T5 T4
xxxx1
F0 POL TM1 TM0
T3 T2 T1 T0
T3 T2 T1 T0
111 1
0
1
1
1
TABLE II. Write Command.
D1 D0
10
00
10
11
TMP122, TMP124
SBOS272B
www.ti.com
5


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Featured Datasheets

Part NumberDescriptionMFRS
TMP122AIDBVRThe function is 1.5C Accurate Programmable Digital Temperature Sensors with SPI Interface. Burr-Brown CorporationBurr-Brown Corporation
TMP122AIDBVTThe function is 1.5C Accurate Programmable Digital Temperature Sensors with SPI Interface. Burr-Brown CorporationBurr-Brown Corporation

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