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What is MC74A6?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "Serial Digital Temperature Sensor".


MC74A6 Datasheet PDF - ON Semiconductor

Part Number MC74A6
Description Serial Digital Temperature Sensor
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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MC74
Serial Digital
Temperature Sensor
The MC74 is a serial digital temperature sensor suited for low cost
applications. Temperature data is converted from the integrated
thermal sensing element and made available as an 8–bit serial digital
word. Communication with the MC74 is accomplished via 2–wire
SMBus/I2C–compatible serial port. Temperature resolution is 1°C.
Conversion rate is a nominal 8 samples/sec. Power consumption is
only 200 µA (5.0 µA Standby).
Features
Temperature Range: –40°C to +125°C
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
3.3 V and 5.5 V Operating Range
Low Power
200 µA Operations
5.0 µA Standby Mode
Typical Applications
Thermal Protection for Hard Disk Drives and Other PC Peripherals
Low–Cost Thermostat Controls
Power Supplies
FUNCTIONAL BLOCK DIAGRAM
Internal Sensor
(Diode)
Serial Port
Interface
DS Modulator
Control
Logic
Temperature
Register
SDA
SCL
http://onsemi.com
5
1
2
3
4
SOT–23
SN SUFFIX
CASE 1212
1
5
TO–220
T SUFFIX
CASE 314D
PIN CONNECTIONS
NC 1
5 SDA
GND 2
VDD 3
4 SCL
(Top View)
SOT–23A*
NOTE: *SOT–23A is equivalent to EIAJ–SC74A
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of
this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2000
November, 2000 – Rev. 1
1
Publication Order Number:
MC74/D

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MC74A6 equivalent
MC74
Write Byte Format
S ADDRESS
7 Bits
Slave Address
Read Byte Format
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.
S ADDRESS WR
7 Bits
Slave Address
ACK COMMAND ACK
8 Bits
S ADDRESS RD ACK
7 Bits
Command Byte: selects
which register you are
reading from.
Slave Address: repeated
due to change in data–
flow direction.
DATA NACK P
8 Bits
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
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
Figure 1. SMBus Protocols
Start Condition (START)
The MC74 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.
Address Byte
Immediately following the Start Condition, the host must
transmit the address byte to the MC74. The states of A1 and
A0 determine the 7–bit SMBus address for the MC74. The
7–bit address transmitted in the serial bit stream must match
for the MC74 to respond with an Acknowledge (indicating
the MC74 is on the bus and ready to accept data). The eighth
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.
Acknowledge (ACK)
Acknowledge (ACK) provides a positive handshake
between the host and the MC74. The host releases SDA after
transmitting eight bits, then generates a ninth clock cycle to
allow the MC74 to pull the SDA line LOW to acknowledge
that it successfully received the previous eight bits of data or
address.
Data Byte
After a successful ACK of the address byte, the host must
transmit the data byte to be written or clock out the data to
be read. (See the appropriate timing diagrams. ) ACK will
be generated after a successful write of a data byte into the
MC74.
Stop Condition (STOP)
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 MC74. NOTE: Refer to Timing Diagrams
for serial bus timing (Figure 2).
http://onsemi.com
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