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PDF ( 数据手册 , 数据表 ) TC74

零件编号 TC74
描述 Tiny Serial Digital Thermal Sensor
制造商 Microchip
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TC74 数据手册, 描述, 功能
TC74
Tiny Serial Digital Thermal Sensor
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:
- 200µA Operating
- 5µA 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
TO-220
TC74
12 345
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/I2Ccompatible 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
200µA typ, (5µA 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
Internal Sensor
(Diode)
∆∑ Modulator
Serial Port
Interface
Control
Logic
SDA
SCL
Temperature
Register
SOT-23
SDA
SCLK
54
TC74
1 23
NC GND VDD
© 2002 Microchip Technology Inc.
DS21462B-page 1







TC74 pdf, 数据表
TC74
FIGURE 3-1:
SMBUS PROTOCOLS
Write Byte Format
S Address
7 Bits
Slave Address
WR ACK Command
ACK Data ACK P
8 Bits
8 Bits
Command Byte: selects
which register you are
writing to.
Data Byte: data goes
into the register set
by the command byte.
Read Byte Format
S Address WR ACK Command ACK S 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
S Address RD ACK Data Nack P
7 Bits
8 Bits
S = START Condition
P = STOP Condition
Shaded = Slave Transmission
Data Byte: reads data from
the register commanded by
the last Read Byte or Write
Byte transmission.
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.
DS21462B-page 8
© 2002 Microchip Technology Inc.







TC74 equivalent, schematic
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03/01/02
DS21462B-page 16
*DS21462B*
© 2002 Microchip Technology Inc.










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