Datasheet.kr   

MC74A0 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 MC74A0은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 MC74A0 자료 제공

부품번호 MC74A0 기능
기능 Serial Digital Temperature Sensor
제조업체 ON Semiconductor
로고 ON Semiconductor 로고


MC74A0 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.



전체 12 페이지수

미리보기를 사용할 수 없습니다

MC74A0 데이터시트, 핀배열, 회로
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




MC74A0 pdf, 반도체, 판매, 대치품
MC74
DETAILED OPERATING DESCRIPTION
The MC74 acquires and converts temperature
information from its integrated solid state sensor with a
basic accuracy 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 MC74, which allows for a
multi–sensor configuration. Also, there is low–power
Standby mode where temperature acquisition is suspended.
Standby Mode
The MC74 allows the host to put it into a low power
(IDD = 5.0 µA, 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.
The table below summarizes this operation.
Standby Mode Operation
SHDN Bit
0
1
Operating Mode
Normal
Standby
SMBus Slave Address
The MC74 is internally programmed to have a default
SMBus address value of 1001 101b. Seven other addresses
are available by custom order (contact factory).
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 MC74. The following
conventions are used in this bus architecture:
MC74 Serial Bus Conventions
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 trans-
fer 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 conditions).
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 MC74 always
operates as a Slave. The serial protocol is illustrated in
Figure 1. All data transfers have two phases; all bytes are
transferred MSB first. Accesses are initiated by a start
condition (START), 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 (STOP). 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).
http://onsemi.com
4

4페이지










MC74A0 전자부품, 판매, 대치품
MC74
REGISTER SET and PROGRAMMER’S MODEL
MC74 Command Set
(SMBus READ_BYTE and WRITE_BYTE)
Command Byte Description
Command Code
Function
RTR
00h Read Temperature (TEMP)
RWCR
01h Read/Write Configuration (CONFIG)
Configuration Register (CONFIG), 8–BITS,
READ/WRITE
Configuration Register (Config)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
SHDN Data Rdy Reserved
Bit POR Function
Type Operation
D[7] 0 STANDBY Read/ 1 = stand-
switch
Write by,
0 = normal
D[6] 0 Data Ready* Read 1 = ready,
Only
0 = not
ready
D[5]–D[0] 0
Reserved –
Always returns
zero when
read.
N/A
N/A
*DATA_RDY bit reset at power–up and SHDN enable (see below).
V DD
DATA_RDY
SHDN
t conv
t conv
Figure 3. DATA_RDY, SHDN Operation Logic Diagram
Temperature Register (TEMP), 8–Bits,
READ–ONLY
The binary value (2’s complement format) in this register
represents temperature of the integrated sensor following a
conversion cycle. The registers are automatically updated in
an alternating manner.
Temperature Register (TEMP)
D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]
MSB x x x x x x LSB
In the temperature data registers, each unit value
represents 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 temperature to
binary value relationship are shown in the following table.
Temperature–to–Digital Value Conversion (TEMP)
ACTUAL
TEMPERATURE
REGISTERED
TEMPERATURE
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
Register Set Summary
The MC74’s register set is summarized below. All
registers are 8–bits wide.
Name
Description
POR State Read Write
TEMP
Internal sensor
temperature
(2’s complement)
0000 0000b*
CONFIG CONFIG register 0000 0000b
*NOTE: The TEMP register immediately will be updated by the A/D
converter after the DATA_RDY bit goes high.
http://onsemi.com
7

7페이지


구       성 총 12 페이지수
다운로드[ MC74A0.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
MC74A0

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor
MC74A1

Serial Digital Temperature Sensor

ON Semiconductor
ON Semiconductor

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵