Texas Instruments TMP421, TMP422, TMP423A, TMP423B Schematic [ru]

+5V

SCL

GND

SDA

V+

SMBus

Controller

TMP421

DXP

DXN

1ChannelLocal

1ChannelRemote

TMP422

DX1

DX2

DX3

DX4

1ChannelLocal

2ChannelsRemote

TMP423

DXP1

DXP2

DXP3

DXN

1ChannelLocal

3ChannelsRemote

TMP421 TMP422

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SBOS398B – JULY 2007 – REVISED MARCH 2008

TMP423

± 1 ° C Remote and Local TEMPERATURE SENSOR

in SOT23-8

FEATURES DESCRIPTION

234

• SOT23-8 PACKAGE

• ± 1 ° C REMOTE DIODE SENSOR (MAX)

• ± 1.5 ° C LOCAL TEMPERATURE SENSOR (MAX)

• SERIES RESISTANCE CANCELLATION

• n-FACTOR CORRECTION integral part of microcontrollers, microprocessors, or

• TWO-WIRE/ SMBus™ SERIAL INTERFACE

• MULTIPLE INTERFACE ADDRESSES

• DIODE FAULT DETECTION

• RoHS COMPLIANT AND NO Sb/Br

APPLICATIONS

• PROCESSOR/FPGA TEMPERATURE

MONITORING

• LCD/ DLP

• SERVERS

• CENTRAL OFFICE TELECOM EQUIPMENT

• STORAGE AREA NETWORKS (SAN)

/LCOS PROJECTORS

The TMP421, TMP422, and TMP423 are remote temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an

FPGAs. Remote accuracy is ± 1 ° C for multiple IC

manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device.

The TMP421, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150 ° C), and diode fault detection.

The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package.

2 DLP is a registered trademark of Texas Instruments. 3 SMBus is a trademark of Intel Corporation. 4 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 the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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.

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TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

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.

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 INFORMATION

PRODUCT DESCRIPTION ADDRESS PACKAGE-LEAD DESIGNATOR MARKING

TMP421 Remote Junction 100 11xx SOT23-8 DCN DACI

TMP422 Remote Junction 100 11xx SOT23-8 DCN DADI

TMP423A Triple Channel 100 1100 SOT23-8 DCN DAEI TMP423B 100 1101 SOT23-8 DCN DAFI

(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com .

ABSOLUTE MAXIMUM RATINGS

Single Channel

Temperature Sensor

Dual Channel

Temperature Sensor

Remote Junction

Temperature Sensor

(1)

TWO-WIRE PACKAGE PACKAGE

(1)

Over operating free-air temperature range, unless otherwise noted.

TMP421, TMP422, TMP423 UNIT

Power Supply, V

Input Voltage

Input Current 10 mA Operating Temperature Range – 55 to +127 ° C Storage Temperature Range – 60 to +130 ° C Junction Temperature (T

ESD Rating Charged Device Model (CDM) 1000 V

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied.

Pins 1, 2, 3, and 4 only – 0.5 to VS+ 0.5 V Pins 6 and 7 only – 0.5 to 7 V

max) +150 ° C

Human Body Model (HBM) 3000 V

Machine Model (MM) 200 V

+7 V

Product Folder Link(s): TMP421 TMP422 TMP423

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TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

ELECTRICAL CHARACTERISTICS

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

TMP421, TMP422, TMP423

PARAMETER CONDITIONS MIN TYP MAX UNIT

TEMPERATURE ERROR

Local Temperature Sensor TE

Remote Temperature Sensor

vs Supply (Local/Remote) VS= 2.7V to 5.5V ± 0.2 ± 0.5 ° C/V

TEMPERATURE MEASUREMENT

Conversion Time (per channel) 100 115 130 ms Resolution

Local Temperature Sensor (programmable) 12 Bits Remote Temperature Sensor 12 Bits

Remote Sensor Source Currents

High Series Resistance 3k Ω Max 120 µ A Medium High 60 µ A Medium Low 12 µ A Low 6 µ A

Remote Transistor Ideality Factor η TMP421/22/23 Optimized Ideality Factor 1.008

SMBus INTERFACE

Logic Input High Voltage (SCL, SDA) V Logic Input Low Voltage (SCL, SDA) V Hysteresis 500 mV SMBus Output Low Sink Current 6 mA SDA Output Low Voltage V Logic Input Current 0 ≤ VIN≤ 6V – 1 +1 µ A SMBus Input Capacitance (SCL, SDA) 3 pF SMBus Clock Frequency 3.4 MHz SMBus Timeout 25 30 35 ms SCL Falling Edge to SDA Valid Time 1 µ s

DIGITAL INPUTS

Input Capacitance 3 pF Input Logic Levels

Input High Voltage V Input Low Voltage V Leakage Input Current I

POWER SUPPLY

Specified Voltage Range V Quiescent Current I

Undervoltage Lockout UVLO 2.3 2.4 2.6 V Power-On Reset Threshold POR 1.6 2.3 V

TEMPERATURE RANGE

Specified Range – 40 +125 ° C Storage Range – 60 +130 ° C Thermal Resistance, SOT23 θ

(1)

LOCAL

REMOTE

TA= +15 ° C to +85 ° C, TD= – 40 ° C to +150 ° C, VS= 3.3V ± 0.25 ± 1 ° C

TA= – 40 ° C to +100 ° C, TD= – 40 ° C to +150 ° C, VS= 3.3V ± 1 ± 3 ° C

TA= – 40 ° C to +125 ° C, TD= – 40 ° C to +150 ° C ± 3 ± 5 ° C

Serial Bus Active, fS= 400kHz, Shutdown Mode 90 µ A Serial Bus Active, fS= 3.4MHz, Shutdown Mode 350 µ A

(1) Tested with less than 5 Ω effective series resistance and 100pF differential input capacitance.

TA= – 40 ° C to +125 ° C ± 1.25 ± 2.5 ° C

TA= +15 ° C to +85 ° C, VS= 3.3V ± 0.25 ± 1.5 ° C

2.1 V

0.8 V

= 6mA 0.15 0.4 V

OUT

0.7(V+) (V+)+0.5 V – 0.5 0.3(V+) V

0V ≤ VIN≤ V

0.0625 Conversions per Second 32 38 µ A Eight Conversions per Second 400 525 µ A

Serial Bus Inactive, Shutdown Mode 3 10 µ A

2.7 5.5 V

100 ° C/W

1 µ A

Product Folder Link(s): TMP421 TMP422 TMP423

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V+

SCL

GND

DXP

DXN

SDA

TMP421

V+

SCL

GND

DX1

DX2

DX3

DX4

SDA

TMP422

TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

TMP421 PIN CONFIGURATION

DCN PACKAGE

SOT23-8

(TOP VIEW)

TMP421 PIN ASSIGNMENTS

TMP421

NO. NAME DESCRIPTION

1 DXP Positive connection to remote temperature sensor. 2 DXN Negative connection to remote temperature sensor. 3 A1 Address pin 4 A0 Address pin 5 GND Ground 6 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+. 7 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+. 8 V+ Positive supply voltage (2.7V to 5.5V)

TMP422 PIN CONFIGURATION

DCN PACKAGE

SOT23-8

(TOP VIEW)

TMP422 PIN ASSIGNMENTS

TMP422

NO. NAME DESCRIPTION

1 DX1 Channel 1 remote temperature sensor connection pin. Also sets the TMP422 address; see Table 10 . 2 DX2 Channel 1 remote temperature sensor connection pin. Also sets the TMP422 address; see Table 10 . 3 DX3 Channel 2 remote temperature sensor connection pin. Also sets the TMP422 address; see Table 10 . 4 DX4 Channel 2 remote temperature sensor connection pin. Also sets the TMP422 address; see Table 10 . 5 GND Ground 6 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+. 7 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+. 8 V+ Positive supply voltage (2.7V to 5.5V)

Product Folder Link(s): TMP421 TMP422 TMP423

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V+

SCL

GND

DXP1

DXP2

DXP3

DXN

SDA

TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

TMP423 PIN CONFIGURATION

DCN PACKAGE

SOT23-8

(TOP VIEW)

TMP423 PIN ASSIGNMENTS

TMP423

NO. NAME DESCRIPTION

1 DXP1 Channel 1 positive connection to remote temperature sensor. 2 DXP2 Channel 2 positive connection to remote temperature sensor. 3 DXP3 Channel 3 positive connection to remote temperature sensor. 4 DXN Common negative connection to remote temperature sensors, Channel 1, Channel 2, Channel 3. 5 GND Ground 6 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+. 7 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+. 8 V+ Positive supply voltage (2.7V to 5.5V)

TMP421 TMP422 TMP423

Product Folder Link(s): TMP421 TMP422 TMP423

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-1

-2

-3

AmbientTemperature,T ( C)°

-50 -25 1251007550250

RemoteTemperatureError( C)°

V =3.3V

T =+25 C

REMOTE

30TypicalUnitsShown h =1.008

LocalTemperatureError( )

°C

AmbientTemperature,T (A°C)

-1

-2

-3

-50 125-25 0 25 50 75 100

50UnitsShown

V =3.3V

-20

-40

-60

LeakageResistance(M )W

0 5 10 15 20 25 30

RemoteT

emperatureError( C)°

R GND-

R V-

RemoteTemperatureError( )

°C

R W( )

2.0

1.5

1.0

0.5

-0.5

-1.0

-1.5

-2.0

0 3500500 1000 1500 2000 2500 3000

V =2.7V

V =5.5V

-1

-2

-3

Capacitance(nF)

0 0.5 1.0 1.5 2.0 2.5 3.0

RemoteTemperatureError( C)°

RemoteTemperatureError( )

°C

R (W)

2.0

1.5

1.0

0.5

-0.5

-1.0

-1.5

-2.0

0 3500500 1000 1500 2000 2500 3000

V =2.7V

V =5.5V

TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

REMOTE TEMPERATURE ERROR LOCAL TEMPERATURE ERROR

vs TEMPERATURE vs TEMPERATURE

TYPICAL CHARACTERISTICS

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

Figure 1. Figure 2.

REMOTE TEMPERATURE ERROR REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE

vs LEAKAGE RESISTANCE (Diode-Connected Transistor, 2N3906 PNP)

Figure 3. Figure 4.

REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE REMOTE TEMPERATURE ERROR

(GND Collector-Connected Transistor, 2N3906 PNP) vs DIFFERENTIAL CAPACITANCE

Figure 5. Figure 6.

Product Folder Link(s): TMP421 TMP422 TMP423

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500

450

400

350

300

250

200

150

100

ConversionRate(conversions/sec)

0.0625 0.125 0.25 0.5 1 2 4 8

I (mA)

V =2.7V

V =5.5V

-5

-10

-15

-20

-25

Frequency(MHz)

0 5 10 15

TemperatureError( C)°

Local100mV Noise

Remote100mV Noise

Local250mV Noise

Remote250mV Noise

500

450

400

350

300

250

200

150

100

SCLCLockFrequency(Hz)

1k 10k 100k 1M 10M

( A)m

V =3.3V

V =5.5V

I ( )

V (SV)

4.53.0 3.5 4.0 5.55.02.5

TYPICAL CHARACTERISTICS (continued)

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

TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

vs POWER-SUPPLY NOISE FREQUENCY vs CONVERSION RATE

TEMPERATURE ERROR QUIESCENT CURRENT

Figure 7. Figure 8.

SHUTDOWN QUIESCENT CURRENT SHUTDOWN QUIESCENT CURRENT

vs SCL CLOCK FREQUENCY vs SUPPLY VOLTAGE

Figure 9. Figure 10.

Product Folder Link(s): TMP421 TMP422 TMP423

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0.1 Fm

10kW (typ)

TMP421

DXP

DXN

V+

(2)

DIFF

(3)

DIFF

(3)

(2)

GND

SCL

SDA

+5V

SMBus

Controller

Diode-connectedconfiguration :

(1)

SeriesResistance

Transistor-connectedconfiguration :

(1)

TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

APPLICATION INFORMATION

The TMP421 (two-channel), TMP422 (three-channel), The TMP422 requires transistors connected between and TMP423 (four-channel) are digital temperature DX1 and DX2 and between DX3 and DX4. Unused sensors that combine a local die temperature channels on the TMP422 must be connected to GND. measurement channel and one, two, or three remote The TMP423 requires a transistor connected to each junction temperature measurement channels in a positive channel (DXP1, DXP2, and DXP3), with the single SOT23-8 package. These devices are base of each channel tied to the common negative, two-wire- and SMBus interface-compatible and are DXN. For an unused channel, the TMP423 DXP pin specified over a temperature range of – 40 ° C to can be left open or tied to GND. +125 ° C. The TMP421/22/23 each contain multiple registers for holding configuration information and temperature measurement results.

For proper remote temperature sensing operation, the recommended for local bypassing. Figure 11 shows a TMP421 requires only a transistor connected typical configuration for the TMP421; Figure 12 between DXP and DXN pins. If the remote channel is illustrates a typical application for the TMP422. not utilized, DXP can be left open or tied to GND. Figure 13 illustrates a typical application for the

The TMP421/22/23 SCL and SDA interface pins each require pull-up resistors as part of the communication bus. A 0.1 µ F power-supply bypass capacitor is

TMP423.

(1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance cancellation.

(2) RS(optional) should be < 1.5k Ω in most applications. Selection of RSdepends on application; see the Filtering section. (3) C

(optional) should be < 1000pF in most applications. Selection of C

DIFF

Figure 6 , Remote Temperature Error vs Differential Capacitance.

depends on application; see the Filtering section and

DIFF

Figure 11. TMP421 Basic Connections

Product Folder Link(s): TMP421 TMP422 TMP423

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TMP422

DX1

(4)

DX2

(4)

(2)

DIFF

(3)

DIFF

(3)

(2)

GND

Diode-connectedconfiguration :

(1)

SeriesResistance

Transistor-connectedconfiguration :

(1)

DX3

(4)

DX4

(4)

(2)

DIFF

(3)

0.1 Fm

10kW (typ)

V+

SCL

SDA

+5V

SMBus

Controller

DXP1

DXN1

DXP2

DXN2

+5V

TMP423

DXP1

DXP2

DXP3

DXP

DXN

SCL

GND

SDA

V+

(2)

DIFF

(3)

DIFF

(3)

DIFF

(3)

Transistor-connectedconfiguration :

(1)

DIFF

(3)

(2)

Diode-connectedconfiguration :

(1)

0.1 Fm

10kW (typ)

SMBus

Controller

SeriesResistance

TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

(1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance cancellation.

(2) RS(optional) should be < 1.5k Ω in most applications. Selection of RSdepends on application; see the Filtering section. (3) C

(optional) should be < 1000pF in most applications. Selection of C

DIFF

Figure 6 , Remote Temperature Error vs Differential Capacitance.

(4) TMP422 SMBus slave address is 1001 100 when connected as shown.

(1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance cancellation.

(2) RS(optional) should be < 1.5k Ω in most applications. Selection of RSdepends on application; see the Filtering section. (3) C

Figure 6 , Remote Temperature Error vs Differential Capacitance.

(optional) should be < 1000pF in most applications. Selection of C

DIFF

Figure 12. TMP422 Basic Connections

Figure 13. TMP423 Basic Connections

Product Folder Link(s): TMP421 TMP422 TMP423

DIFF

depends on application; see the Filtering section and

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TMP421 TMP422 TMP423

SBOS398B – JULY 2007 – REVISED MARCH 2008

SERIES RESISTANCE CANCELLATION

Series resistance in an application circuit that typically results from printed circuit board (PCB) trace resistance and remote line length is automatically cancelled by the TMP421/22/23, preventing what would otherwise result in a temperature offset. A total of up to 3k Ω of series line resistance is cancelled by the TMP421/22/23, eliminating the need for additional characterization and temperature offset correction. See the two Remote Temperature Error vs Series Resistance typical characteristic curves (Figure 4 and

Figure 5 ) for details on the effects of series resistance

and power-supply voltage on sensed remote temperature error.

DIFFERENTIAL INPUT CAPACITANCE

The TMP421/22/23 tolerate differential input capacitance of up to 1000pF with minimal change in temperature error. The effect of capacitance on sensed remote temperature error is illustrated in

from low to high. The change in measurement range and data format from standard binary to extended binary occurs at the next temperature conversion. For data captured in the extended temperature range configuration, an offset of 64 (40h) is added to the standard binary value, as shown in the Extended Binary column of Table 1 . This configuration allows measurement of temperatures as low as – 64 ° C, and as high as +191 ° C; however, most temperature-sensing diodes only measure with the range of – 55 ° C to +150 ° C. Additionally, the TMP421/22/23 are rated only for ambient temperatures ranging from – 40 ° C to +125 ° C. Parameters in the Absolute Maximum Ratings table must be observed.

Table 1. Temperature Data Format (Local and

Remote Temperature High Bytes)

LOCAL/REMOTE TEMPERATURE REGISTER

HIGH BYTE VALUE (1 ° C RESOLUTION)

TEMP

STANDARD BINARY

(1)

EXTENDED BINARY

Figure 6 , Remote Temperature Error vs Differential ( ° C) BINARY HEX BINARY HEX

Capacitance.

TEMPERATURE MEASUREMENT DATA

Temperature measurement data may be taken over an operating range of – 40 ° C to +127 ° C for both local and remote locations.

However, measurements from – 55 ° C to +150 ° C can be made both locally and remotely by reconfiguring the TMP421/22/23 for the extended temperature range, as described below.

Temperature data that result from conversions within the default measurement range are represented in binary form, as shown in Table 1 , Standard Binary column. Note that although the device is rated to only measure temperatures down to – 55 ° C, it may read temperatures below this level. However, any

– 64 1100 0000 C0 0000 0000 00 – 50 1100 1110 CE 0000 1110 0E – 25 1110 0111 E7 0010 0111 27

0 0000 0000 00 0100 0000 40 1 0000 0001 01 0100 0001 41

5 0000 0101 05 0100 0101 45 10 0000 1010 0A 0100 1010 4A 25 0001 1001 19 0101 1001 59 50 0011 0010 32 0111 0010 72 75 0100 1011 4B 1000 1011 8B

100 0110 0100 64 1010 0100 A4 125 0111 1101 7D 1011 1101 BD 127 0111 1111 7F 1011 1111 BF 150 0111 1111 7F 1101 0110 D6 175 0111 1111 7F 1110 1111 EF 191 0111 1111 7F 1111 1111 FF

temperature below – 64 ° C results in a data value of – 64 (C0h). Likewise, temperatures above +127 ° C result in a value of 127 (7Fh). The device can be set to measure over an extended temperature range by

(1) Resolution is 1 ° C/count. Negative numbers are represented in

two's complement format.

(2) Resolution is 1 ° C/count. All values are unsigned with a – 64 ° C

changing bit 2 (RANGE) of Configuration Register 1 offset.

(2)

Product Folder Link(s): TMP421 TMP422 TMP423

+ 21 hidden pages

Texas Instruments TMP421, TMP422, TMP423A, TMP423B Schematic [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES DESCRIPTION

APPLICATIONS

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

TMP421 PIN CONFIGURATION

TMP422 PIN CONFIGURATION

TMP423 PIN CONFIGURATION

TYPICAL CHARACTERISTICS

APPLICATION INFORMATION

SERIES RESISTANCE CANCELLATION

DIFFERENTIAL INPUT CAPACITANCE

TEMPERATURE MEASUREMENT DATA