2002 Microchip Technology Inc.

DS21462B-page 1

TC74

Features

· Digital Temperature Sensing in SOT-23-5 Package

· Outputs Temperature as an 8-Bit Digital Word

· Simple Serial Port Interface

· Solid-State Temperature Sensing:

- ±2°C Accuracy from +25°C to +85°C

- ±3°C Accuracy from 0°C to +125°C

· 3.0 and 5.5V Operating Range

· Low Power:

- 200

A Operating

- 5

A Standby Mode

Applications

· Thermal Protection for Hard Disk Drives

and other PC Peripherals

· PC Card Devices for Notebook Computers

· Low Cost Thermostat Controls

· Power Supplies

· Thermistor Replacement

Package Type

General Description

The TC74 is a serially accessible digital temperature
sensor particularly suited for low cost and small form-
factor applications. Temperature data is converted from
the onboard thermal sensing element and made
available as an 8-bit digital word.

Communication with the TC74 is accomplished via a 2-
wire SMBus/I

compatible serial port. This bus also

can be used to implement multi-drop/multi-zone
monitoring. The SHDN bit in the CONFIG register can
be used to activate the low power Standby mode.

Temperature resolution is 1°C. Conversion rate is a
nominal 8 samples/sec. Power consumption is only
200

A typ, (5

A Standby, typ).

Small size, low installed cost, and ease of use make the
TC74 an ideal choice for implementing thermal
management in a variety of systems.

Functional Block Diagram

GND

SDA

SCLK

1 2 3 4 5

TC74

TO-220

SOT-23

GND

SDA

SCLK

TC74

Internal Sensor

(Diode)

Modulator

Temperature

Serial Port

Interface

Control

Logic

SDA

SCL

Tiny Serial Digital Thermal Sensor

TC74

DS21462B-page 2

2002 Microchip Technology Inc.

Device Selection Table

NOTE: *Default Address.

Part Number

Package

Address

Temperature Range

TC74A0-3.3VCT

SOT-23A-5

1001 000

-40°C to +125°C

TC74A1-3.3VCT

SOT-23A-5

1001 001

-40°C to +125°C

TC74A2-3.3VCT

SOT-23A-5

1001 010

-40°C to +125°C

TC74A3-3.3VCT

SOT-23A-5

1001 011

-40°C to +125°C

TC74A4-3.3VCT

SOT-23A-5

1001 100

-40°C to +125°C

TC74A5-3.3VCT*

SOT-23A-5

1001 101*

-40°C to +125°c

TC74A6-3.3VCT

SOT-23A-5

1001 110

-40°C to +125°C

TC74A7-3.3VCT

SOT-23A-5

1001 111

-40°C to +125°C

TC74A0-5.0VCT

SOT-23A-5

1001 000

-40°C to +125°C

TC74A1-5.0VCT

SOT-23A-5

1001 001

-40°C to +125°C

TC74A2-5.0VCT

SOT-23A-5

1001 010

-40°C to +125°C

TC74A3-5.0VCT

SOT-23A-5

1001 011

-40°C to +125°C

TC74A4-5.0VCT

SOT-23A-5

1001 100

-40°C to +125°C

TC74A5-5.0VCT*

SOT-23A-5

1001 101

-40°C to +125°C

TC74A6-5.0VCT

SOT-23A-5

1001 110

-40°C to +125°C

TC74A7-5.0VCT

SOT-23A-5

1001 111

-40°C to +125°C

TC74A0-3.3VAT

TO-220-5

1001 000

-40°C to +125°C

TC74A1-3.3VAT

TO-220-5

1001 001

-40°C to +125°C

TC74A2-3.3VAT

TO-220-5

1001 010

-40°C to +125°C

TC74A3-3.3VAT

TO-220-5

1001 011

-40°C to +125°C

TC74A4-3.3VAT

TO-220-5

1001 100

-40°C to +125°C

TC74A5-3.3VAT

TO-220-5

1001 101

-40°C to +125°C

TC74A6-3.3VAT

TO-220-5

1001 110

-40°C to +125°C

TC74A7-3.3VAT

TO-220-5

1001 111

-40°C to +125°C

TC74A0-5.0VAT

TO-220-5

1001 000

-40°C to +125°C

TC74A1-5.0VAT

TO-220-5

1001 001

-40°C to +125°C

TC74A2-5.0VAT

TO-220-5

1001 010

-40°C to +125°C

TC74A3-5.0VAT

TO-220-5

1001 011

-40°C to +125°C

TC74A4-5.0VAT

TO-220-5

1001 100

-40°C to +125°C

TC74A5-5.0VAT

TO-220-5

1001 101

-40°C to +125°C

TC74A6-5.0VAT

TO-220-5

1001 110

-40°C to +125°C

TC74A7-5.0VAT

TO-220-5

1001 111

-40°C to +125°C

2002 Microchip Technology Inc.

DS21462B-page 3

TC74

1.0

ELECTRICAL
CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage (V

) ............................................ +6V

Voltage On Any Pin ....... (GND 0.3V) to (V

+ 0.3V)

Current On Any Pin .......................................... ±50 mA

Operating Temperature (T

) ........................ See Below

Storage Temperature (T

STG

) .............. -65°C to +150°C

*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to Absolute Maximum Rating conditions for extended
periods may affect device reliability.

TC74 ELECTRICAL SPECIFICATIONS

Electrical Characteristics: V

= 3.3V or 5.0V (Note 5), -40°C

125°C, unless otherwise noted.

Symbol

Parameter

Min

Typ.

Max

Unit

Test Conditions

Power Supply

POR

Power-on Reset Threshold

1.2

2.2

Falling Edge or Rising Edge

Operating Current

200

350

= 5.5V

Serial Port Inactive (Note 1)

DD-STANDBY

Standby Supply Current

= 3.3V

Serial Port Inactive (Note 1)

Temperature to Bits Converter

ERR

Temperature Accuracy TC74A

-2
-3

°C

+25°C <T

< +85°C

0°C < T

< +125°C

-40°C < T

< 0°C

Conversion Rate

Sps

(Note 2)

Serial Port Interface

Logic Input High

0.8 x V

Logic Input Low

0.2 x V

SDA Output Low

--
--

0.4
0.6

V
V

= 3 mA

= 6 mA (Note 3)

Input Capacitance SDA, SCL

LEAK

I/O Leakage

-1

0.1

Note

Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.

Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.

Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and

temperature drift error.

SDA and SCLK must be connected to V

or GND.

= 3.3V for TC74X -3.3VCT. V

= 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power

supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As V

varies from

the nominal value, accuracy will degrade 1°C/V of V

change.

TC74

DS21462B-page 4

2002 Microchip Technology Inc.

TC74 ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: V

= 3.3V or 5.0V (Note 5), -40°C

125°C, C

= 80pF unless otherwise noted.

Serial Port AC Timing

Symbol

Parameter

Min

Typ.

Max

Unit

Test Conditions

SMB

SMBus Clock Frequency

100

kHz

LOW

Low Clock Period

4.7

sec

10% to 10%

HIGH

High Clock Period

sec

90% to 90%

SMBus Rise Time
SMBus Fall Time

--
--

1000

300

nsec
nsec

10% to 90%
90% to10%

SU(START)

START Condition Setup Time
(for repeated START Condition)

sec

90% SCLK to 10% SDA

H(START)

START Condition Hold Time

sec

SU-DATA

Data In Setup Time

1000

nsec

H-DATA

Data In Hold Time

1250

nsec

SU(STOP)

STOP Condition Setup Time

sec

IDLE

Bus Free Time Prior to New Tran-
sition

4.7

sec

POR

Power-on Reset Delay

500

sec

POR

(Rising Edge)

Note

Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.

Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.

Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and

temperature drift error.

SDA and SCLK must be connected to V

or GND.

= 3.3V for TC74X -3.3VCT. V

= 5.0V for TC74X -5.0VCT. All part types of the TC74 will operate properly over the wider power

supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As V

varies from

the nominal value, accuracy will degrade 1°C/V of V

change.

TC74

DS21462B-page 6

2002 Microchip Technology Inc.

Timing Diagrams

(START) t

(START)

-Data

(STOP

)

IDLE

A = START Condition

B = MSB of Address Clocked into Slave

C = LSB of Address Clocked into Slave

D = R/W Bit Clocked into Slave

E = Slave Pulls SDA Line Low

F = Acknowledge Bit Clocked into Master

G = MSB of Data Clocked into Master

H = LSB of Data Clocked into Master

I = Acknowledge Clock Pulse

J = STOP Condition

K = New START Condition

SCL

SDA

SMBUS READ Timing Diagram

(START) t

(START)

-DATA

(STOP) t

IDLE

A = START Condition

B = MSB of Address Clocked into Slave

C = LSB of Address Clocked into Slave

D = R/W Bit Clocked into Slave

E = Slave Pulls SDA Line Low

F = Acknowledge Bit Clocked into Master

G = MSB of Data Clocked into Slave

H = LSB of Data Clocked into Slave

I = Slave Pulls SDA Line Low

J = Acknowledge Clocked into Master

K = Acknowledge Clock Pulse

L = STOP Condition, Data Executed by Slave

M = New START Condition

LOW

HIGH

SCL

SDA

SMBUS Write Timing Diagram

HIGH

LOW

2002 Microchip Technology Inc.

DS21462B-page 7

TC74

3.0

DETAILED DESCRIPTION

3.1

Functional Description

The

TC74

acquires

and

converts

temperature

information from its onboard solid-state sensor with a
resolution of ±1°C. It stores the data in an internal
register which is read through the serial port. The
system interface is a slave SMBus. The temperature
data can be read at any time through the SMBus port.
Eight SMBus addresses are programmable for the
TC74, which allows for a multi-sensor configuration.
Also, there is low power Standby mode when
temperature acquisition is suspended.

3.1.1

STANDBY MODE

The TC74 allows the host to put it into a low power (I

= 5

A, typical) Standby mode. In this mode, the A/D

converter is halted and the temperature data registers
are frozen. The SMBus port operates normally.
Standby mode is enabled by setting the SHDN bit in the
CONFIG register. Table 3-1 summarizes this operation.

TABLE 3-1:

STANDBY MODE OPERATION

3.1.2

SMBUS SLAVE ADDRESS

The TC74 is internally programmed to have a default
SMBus address value of 1001 101b. Seven other
addresses are available by custom order (contact
factory).

3.2

Serial Port Operation

The Serial Clock input (SCL) and bi-directional data
port (SDA) form a 2-wire bi-directional serial port for
programming

and

interrogating

the

TC74.

The

following conventions are used in this bus architecture:

TABLE 3-2:

SERIAL BUS CONVENTIONS

All transfers take place under control of a host, usually
a CPU or microcontroller, acting as the Master, which
provides the clock signal for all transfers. The TC74
always operates as a Slave. The serial protocol is
illustrated in Figure 3-1 All data transfers have two
phases; all bytes are transferred MSB first. Accesses
are initiated by a START condition, followed by a device
address byte and one or more data bytes. The device
address byte includes a Read/Write selection bit. Each
access must be terminated by a STOP Condition. A
convention called Acknowledge (ACK) confirms receipt
of each byte. Note that SDA can change only during
periods when SCL is LOW (SDA changes while SCL is
HIGH are reserved for START and STOP Conditions).

SHDN Bit

Operating Mode

Normal

Standby

Term

Explanation

Transmitter

The device sending data to the bus.

Receiver

The device receiving data from the bus.

Master

The device which controls the bus: initiating
transfers (START), generating the clock, and
terminating transfers. (STOP)

Slave

The device addressed by the master.

START

A unique condition signaling the beginning of
a transfer indicated by SDA falling (High-Low)
while SCL is high.

STOP

A unique condition signaling the end of a
transfer indicated by SDA rising (Low-High)
while SCL is High.

ACK

A Receiver acknowledges the receipt of each
byte with this unique condition. The Receiver
drives SDA low during SCL high of the ACK
clock-pulse. The Master provides the clock
pulse for the ACK cycle.

Busy

Communication is not possible because the
bus is in use.

NOT Busy

When the bus is idle, both SDA and SCL will
remain high.

Data Valid

The state of SDA must remain stable during
the High period of SCL in order for a data bit
to be considered valid. SDA only changes
state while SCL is low during normal data
transfers. (See START and STOP condi-
tions.)

TC74

DS21462B-page 8

2002 Microchip Technology Inc.

FIGURE 3-1:

SMBUS PROTOCOLS

3.3

START Condition (S)

The TC74 continuously monitors the SDA and SCL
lines for a START condition (a HIGH to LOW transition
of SDA while SCL is HIGH) and will not respond until
this condition is met.

3.4

Address Byte

Immediately following the START Condition, the host
must transmit the address byte to the TC74. The states
of A1 and A0 determine the 7-bit SMBus address for
the TC74. The 7-bit address transmitted in the serial bit
stream must match for the TC74 to respond with an
Acknowledge (indicating the TC74 is on the bus and
ready to accept data). The 8-bit in the Address Byte is
a Read/Write Bit. This bit is a `1' for a read operation or
`0' for a write operation. During the first phase of any
transfer this bit will be set = 0 to indicate that the
command byte is being written.

3.5

Acknowledge (ACK)

Acknowledge (ACK) provides a positive handshake
between the host and the TC74. The host releases
SDA after transmitting 8 bits. The host then generates
a ninth clock cycle to allow the TC74 to pull the SDA
line LOW. This action acknowledges that the TC74
successfully received the previous eight bits of data or
address.

3.6

Data Byte

After a successful ACK of the address byte, the host
must transmit the data byte to be written or clock in the
data to be read. (See the appropriate timing diagrams).
ACK will be generated after a successful write of a data
byte into the TC74.

3.7

STOP Condition (P)

Communications must be terminated by a STOP
condition (a LOW to HIGH transition of SDA while SCL
is HIGH). The STOP Condition must be communicated
by the transmitter to the TC74. NOTE: Refer to Timing
Diagrams for serial bus timing.

Address

ACK

Command

ACK

Data

ACK

8 Bits

7 Bits

8 Bits

Slave Address

Command Byte: selects
which register you are
writing to.

Data Byte: data goes
into the register set
by the command byte.

Write Byte Format

Read Byte Format

S Address

ACK

Command

ACK

Address

RD ACK

Data

NACK P

7 Bits

8 Bits

7 Bits

8 Bits

Slave Address

Command Byte: selects
which register you are
reading from.

Slave Address: repeated
due to change in data-
flow direction.

Data Byte: reads from
the register set by the
command byte.

Receive Byte Format

Address

RD ACK

Data

Nack

7 Bits

8 Bits

Data Byte: reads data from
the register commanded by
the last Read Byte or Write
Byte transmission.

S = START Condition

P = STOP Condition

Shaded = Slave Transmission

2002 Microchip Technology Inc.

DS21462B-page 9

TC74

4.0

TABLE 4-2:

CONFIGURATION REGISTER
(CONFIG); 8 BITS, READ/
WRITE)

FIGURE 4-1:

DATA_RDY, SHDN
OPERATION LOGIC
DIAGRAM

4.1

Temperature Register (TEMP),
8 Bits, READ ONLY

The binary value (2's complement format) in this regis-
ter represents temperature of the onboard sensor
following a conversion cycle. The registers are
automatically updated in an alternating manner.

TABLE 4-3:

TEMPERATURE REGISTER
(TEMP)

n the temperature data registers, each unit value repre-

sents one degree (Celsius). The value is in 2's
complement binary format such that a reading of 0000
0000b corresponds to 0°C. Examples of this tempera-
ture to binary value relationship are shown in Table 4-4

4.2

Register Set Summary

The TC74 register set is summarized in Table 4-5. All
registers are 8 bits wide.

TABLE 4-1:

COMMAND BYTE
DESCRIPTION
(SMBUS READ_BYTE AND
WRITE_BYTE)

COMMAND CODE

FUNCTION

RTR

00h

Read Temperature (TEMP)

RWCR

01h

Read/Write Configuration
(CONFIG)

BIT

POR

FUNCTION

TYPE OPERATION

D[7]

STANDBY

Switch

Read/

Write

1 = standby,

0 = normal

D[6]

Data Ready*

Read

Only

1 = ready

0 = not ready

D[5]-D[0]

Reserved -

Always returns

zero when read

N/A

*Note: DATA_RDY bit RESET at power-up and SHDN
enable.

DATA_RDY

SHDN

tconv

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

MSB

LSB

TABLE 4-4:

TEMPERATURE TO DIGITAL
VALUE CONVERSION (TEMP)

ACTUAL

TEMP.

REGISTERED

TEMP.

BINARY

HEX

+130.00°C

+127°C

0111 1111

+127.00°C

+127°C

0111 1111

+126.50°C

+127°C

0111 1111

+25.25°C

+25°C

0001 1001

+0.50°C

+1°C

0000 0001

+0.25°C

0°C

0000 0000

0.00°C

0°C

0000 0000

-0.25°C

0°C

0000 0000

-0.50°C

0°C

0000 0000

-0.75°C

-1°C

1111 1111

-1.00°C

-1°C

1111 1111

-25.00°C

-25°C

1110 0111

-25.25°C

-25°C

1110 0110

-54.75°C

-55°C

1100 1001

-55.00°C

-55°C

1100 1001

-65.00°C

-65°C

1011 1111

TABLE 4-5:

TC74 REGISTER SET
SUMMARY

NAME

DESCRIPTION

POR State

READ WRITE

TEMP

Internal Sensor

Temp. (2's

Complement)

0000 0000b*

CONFIG

0000 0000b

*Note: The TEMP resigister will be immediately updated by
the A/D converter after the DATA_RDY Bit goes High.

2002 Microchip Technology Inc.

DS21462B-page 15

TC74

Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip's products as critical com-
ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con-
veyed, implicitly or otherwise, under any intellectual property
rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,
K

, microID,

MPLAB, PIC, PICmicro, PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control
Solutions Company are registered trademarks of Microchip Tech-
nology Incorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and Total Endurance are trademarks of Microchip Technology
Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their
respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company's quality system processes and
procedures are QS-9000 compliant for its
PICmicro

8-bit MCUs, K

code hopping

devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip's quality system for the
design and manufacture of development
systems is ISO 9001 certified.

DS21462B-page 16

2002 Microchip Technology Inc.

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Korea

Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934

Singapore

Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan

Microchip Technology Taiwan
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

EUROPE

Denmark

Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910

France

Microchip Technology SARL
Parc d'Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany

Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Italy

Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom

Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820

03/01/02

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