Texas Instruments TMP122AIDBVT, TMP124AID Schematic [ru]

SBOS272B – JUNE 2003 – REVISED DECEMBER 2003

1.5°C Accurate Programmable

Digital Temperature Sensors

with SPI™ Interface

TMP122
TMP124

FEATURES

● DIGITAL OUTPUT: SPI-Compatible Interface

● PROGRAMMABLE RESOLUTION:

9- to 12-Bits + Sign

● ACCURACY:

±1.5°C from –25°C to +85°C (max)
±2.0°C from –40°C to +125°C (max)

● LOW QUIESCENT CURRENT: 50µA

● WIDE SUPPLY RANGE: 2.7V to 5.5V

● TINY SOT23-6 AND SO-8 PACKAGES

● OPERATION TO 150°C

● PROGRAMMABLE HIGH/LOW SETPOINTS

APPLICATIONS

● POWER-SUPPLY TEMPERATURE MONITORING

● COMPUTER PERIPHERAL THERMAL PROTECTION

● NOTEBOOK COMPUTERS

● CELL PHONES

● BATTERY MANAGEMENT

● OFFICE MACHINES

● THERMOSTAT CONTROLS

● ENVIRONMENTAL MONITORING and HVAC

● ELECTROMECHANICAL DEVICE TEMPERATURE

DESCRIPTION

The TMP122 and TMP124 are SPI-compatible temperature
sensors available in SOT23-6 and SO-8 packages. Requir­ing 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 low­power applications.

The TMP122 and TMP124 are ideal for extended thermal
measurement in a variety of communication, computer, con­sumer, environmental, industrial, and instrumentation appli­cations.

Temperature

Temperature

Diode

1

2

3

Temp.

Sensor

∆Σ

A/D

Converter

OSC

TMP122

ALERT

GND

V+

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.

Control

Logic

Serial

Interface

Config

and T emp

Register

6

SO/I

5

CS

4

SCK

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SO/I

SCK

NC

GND

Diode

1

Temp.

Sensor

∆Σ

2

A/D

Converter

3

OSC

45

Copyright © 2003, Texas Instruments Incorporated

TMP124

Control

Logic

Serial

Interface

Config

and T emp

Register

8

V+

7

CS

6

NC

ALERT

ABSOLUTE MAXIMUM RATINGS

SI/O

SC
NC

GND

V+
CS
NC
ALERT

1
2
3
4

8
7
6
5

T124

TMP124

Power Supply, V+ .................................................................................. 7V

Input Voltage

Input Current ..................................................................................... 10mA

Operating Temperature Range ......................................–55°C to +150°C

Storage Temperature Range ......................................... –60°C to +150°C

Junction Temperature (T

Lead Temperature (soldering)....................................................... +300°C

(2)

....................................................................... –0.3V to 7V

Max) .................................................... +150°C

J

(1)

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru­ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

NOTES: (1) Stresses above those listed under “Absolute Maximum Ratings”
may cause permanent damage to the device. Exposure to absolute maximum
conditions for extended periods may affect device reliability. (2) Input voltage
rating applies to all TMP122 and TMP124 input voltages.

ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric
changes could cause the device not to meet its published
specifications.

PACKAGE/ORDERING INFORMATION

PRODUCT PACKAGE-LEAD DESIGNATOR

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

TMP122 SOT23-6 DBV –40°C to +125°C T122 TMP122AIDBVT Tape and Reel, 250

(1)

"" "" "TMP122AIDBVR Tape and Reel, 3000

TMP124 SO-8 D –40°C to +125°C T124 TMP124AID Rails, 100

"" "" "TMP124AIDR Tape and Reel, 2500

NOTE: (1) For the most current specifications and package information, refer to our web site at www.ti.com.

SPECIFIED

RANGE MARKING NUMBER MEDIA, QUANTITY

PIN CONFIGURATIONS

Top View SOT23-6

T122

ALERT

GND

V+

1
2
3

TMP122

6

SO/I

5

CS

4

SCK

Top View SO-8

NC = No Connection

2

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TMP122, TMP124

SBOS272B

ELECTRICAL CHARACTERISTICS

At TA = –40°C to +125°C, and V+ = 2.7V to 5.5V, unless otherwise noted.

TMP122, TMP124

PARAMETER CONDITION MIN TYP MAX UNITS
TEMPERATURE INPUT

Range –40 +125 °C
Accuracy (Temperature Error) –25°C to +85°C ±0.5 ±1.5 °C

vs Supply –0.3 0.1 +0.3 °C/V

Resolution

(1)

DIGITAL INPUT/OUTPUT

Input Logic Levels:

V

IH

V

IL

Input Current, SO/I, SCK, CS 0V ≤ V

Output Logic Levels:

V

SO/I I

OL

V

SO/I I

OH

V

ALERT I

OL

Leakage Current ALERT 0V ≤ V
Input Capacitance, SO/I, SCK, CS, ALERT 2.5 pF
Resolution Selectable 9 to 12 + Sign Bits
Conversion Time 9-Bit + Sign 30 40 ms

POWER SUPPLY

Operating Range 2.7 5.5 V
Quiescent Current I
Shutdown Current I

Q

SD

TEMPERATURE RANGE

Specified Range –40 +125 °C
Operating Range –55 +150 °C
Storage Range –60 +150 °C
Thermal Resistance,

θ

JA

NOTE: (1) Specified for 12-bit resolution.

–40°C to +125°C ±1.0 ±2.0 °C
–55°C to +150°C ±1.5 °C

Selectable ±0.0625 °C

0.7(V+) V

0.3(V+) V

≤ V+ ±1 µA

IN

= 3mA 0.4 V

SINK

= 2mA (V+)–0.4 V

SOURCE

= 4mA 0.4 V

SINK

≤ 6V ±1 µA

IN

10-Bit + Sign 60 80 ms
11-Bit + Sign 120 160 ms
12-Bit + Sign 240 320 ms

Serial Bus Inactive 50 75 µA
Serial Bus Inactive 0.1 1 µA

SOT23-6 Surface-Mount 200 °C/W

SO-8 Surface-Mount 150 °C/W

TMP122, TMP124

SBOS272B

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3

TYPICAL CHARACTERISTICS

At TA = +25°C, and V+ = 5.0V, unless otherwise noted.

70

60

50

(µA)

Q

I

40

30

400

300

200

Conversion Time (ms)

100

QUIESCENT CURRENT vs TEMPERATURE

V+ = 5V

V+ = 2.7V

Serial Bus Inactive

–60 –40 –20 0 20 40 60 80 100 120 140

Temperature (°C)

CONVERSION TIME vs TEMPERATURE

V+ = 5V

V+ = 2.7V

12-bit resolution.

–60 –40 –20 0 20 40 60 80 100 120 140

Temperature (°C)

1.0

0.9

0.8

0.7

0.6

0.5

(µA)

0.4

SD

I

0.3

0.2

0.1

0.0

–0.1

2.0

1.5

1.0

0.5

0.0

–0.5
–1.0

Temperature Error (°C)

–1.5
–2.0

SHUTDOWN CURRENT vs TEMPERATURE

–60 –40 –20 0 20 40 60 80 100 120 140

Temperature (°C)

TEMPERATURE ACCURACY vs TEMPERATURE

3 typical units 12-bit resolution.

–60 –40 –20 0 20 40 60 80 100 120 160140

Temperature (°C)

4

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TMP122, TMP124

SBOS272B

APPLICATIONS INFORMATION

The TMP122 and TMP124 digital temperature sensors are
optimal for thermal management and thermal protection appli­cations. 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 connec­tions for the TMP122 and TMP124.

V+

0.1µF

3

1

SCK

SO/I

4

6

TMP122

2

GND

ALERT
(Output)

5

CS

NOTE: Alert requires
pull-up resistor (open drain).
NC indicates pin should be left
open or floating.

SO/I
SCK

NC

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

FIGURE 2.Multiple Command Sequence.

1
2

TMP124

3

16-Bit

WRITE/

Embedded

Address

V+

GND

7
6
5

16-Bit
READ

0.1µF

CS
NC

ALERT
(Output)

8

4

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 regis­ter. 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
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 ad­dress register, see the

Read Address Register

Multiple commands may be strung together as illustrated in
Figure 2. The TMP122/TMP124 accepts commands alternat­ing with 16-bit response data. On lowering
always responds with a READ from the address location
indicated by the READ address register. If the next com­mand 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 tempera­ture 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 tempera­ture data.

Figures 3, 4, 5, and 6 detail the communication sequences.

CS

section.

CS

, the part

. If the

Read Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Temperature 10000000000 0 0 000

Configuration Register 10000000000 0 1000

Low Temp Threshold 10000000000 1 0000
High Temp Threshold 1000000 0000 1 1 000

TABLE I. Read Command.

Write Command D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Configuration Register 0000D1D0R1R0F1F0POLTM1TM00 1 0

Low Temp Threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 0 0

High Temp Threshold T12 T11 T10 T9 T8 T7 T6 T5 T4 T3 T2 T1 T0 1 1 0

Shutdown Command xxxxxxxx11111 1 1 1

TABLE II. Write Command.

TMP122, TMP124

SBOS272B

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5

SO/I

SCK

SO/I

CS

SCK

CS

...

ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15

CS

16-Bit
READ

(Continued)

16-Bit

WRITE/

Embedded

Address

...

SO/I

FIGURE 3. READ followed by WRITE COMMAND to T

CS

SCK

SO/I

CS

SCK

SO/I

SO/I

CS

16-Bit
READ

(Continued)

16-Bit

WRITE/

Embedded

Address

...

LOW/THIGH

Register.

FIGURE 4. READ followed by WRITE COMMAND to Configuration Register.

CS

SCK

SO/I

SO/I

CS

16-Bit
READ

16-Bit

READ

COMMAND

16-Bit

Response

NOTE: (1) 0 indicates T

register, 1 indicates T

LOW

(1)

HIGH

00/1

register.

1T0T1T2T3T4T5T6T7T8T9T10T11T12

...

ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15

010TM0TM1POLF0F1R0R1D0D10000

...

ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15

(Continued)

(Continued)

...

...

CS

SCK

SO/I

CS

SCK

SO/I

FIGURE 5. READ followed by READ COMMAND and Response.

CS

SO/I

16-Bit
READ

CS

SCK

SO/I

FIGURE 6. Data READ.

...

000P0P100000000001

ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15

ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15

6

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TMP122, TMP124

SBOS272B