MC74A3-3.3T [ONSEMI]
Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, THROUGH HOLE MOUNT, TO-220, 5 PIN;型号: | MC74A3-3.3T |
厂家: | ONSEMI |
描述: | Switch/Digital Output Temperature Sensor, DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, THROUGH HOLE MOUNT, TO-220, 5 PIN 输出元件 传感器 换能器 |
文件: | 总12页 (文件大小:129K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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).
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5
SOT–23
4
SN SUFFIX
CASE 1212
1
Features
2
3
• 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
TO–220
T SUFFIX
CASE 314D
• 3.3 V and 5.5 V Operating Range
• Low Power
200 µA Operations
5.0 µA Standby Mode
1
Typical Applications
5
• Thermal Protection for Hard Disk Drives and Other PC Peripherals
• Low–Cost Thermostat Controls
• Power Supplies
PIN CONNECTIONS
1
2
3
5
NC
GND
SDA
SCL
FUNCTIONAL BLOCK DIAGRAM
4
V
DD
Serial Port
Interface
Internal Sensor
(Diode)
SDA
SCL
(Top View)
SOT–23A*
NOTE: *SOT–23A is equivalent to EIAJ–SC74A
DS Modulator
Control
Logic
ORDERING INFORMATION
See detailed ordering and shipping information on page 9 of
this data sheet.
Temperature
Register
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
Semiconductor Components Industries, LLC, 2000
1
Publication Order Number:
November, 2000 – Rev. 1
MC74/D
MC74
PIN DESCRIPTION FOR TO–220–5
Pin No.
Symbol
NC
Type
None
Description
1
2
3
4
5
Not Connected
SDA
GND
SCL
Bi–directional
Power
SMBus Serial Data
System Ground
Input
SMBus Serial Clock
Power Supply Input
V
DD
Power
PIN DESCRIPTION FOR SOT–23–5
Pin No.
Symbol
NC
Type
None
Description
1
2
3
4
5
Not Connected
GND
Power
System Ground
V
DD
Power
Power Supply Input
SMBus Serial Clock
SMBus Serial Data
SCL
SDA
Input
Bi–directional
PIN DESCRIPTION
VDD
SCL
SMBus Serial Clock Input. Clocks data into and out of the
MC74. See System Management Bus Specification, rev. 1.0,
for timing diagrams.
Power Supply Input. See electrical specifications.
GND
Ground return for all MC74 functions.
SDA
Bi–directional Input/Output. Serial data is transferred on
the SMBus in both directions using this pin. See System
Management Bus Specification rev. 1.0 for timing diagrams.
ABSOLUTE MAXIMUM RATINGS*
Rating
Symbol
Value
Unit
V
Power Supply Voltage
V
DD
6.0
Voltage on Any Pin
–
(GND –0.3 V) to (V +0.3 V)
V
DD
Operating Temperature Range
Storage Temperature Range
Current on Any Pin
T
–40 to +125
–65 to +150
±50
°C
A
T
stg
°C
–
mA
°C/W
Package Thermal Resistance
R
330
θ
JA
*Maximum Ratings are those values beyond which damage to the device may occur.
*Static–sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
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2
MC74
DC ELECTRICAL CHARACTERISTICS (V = 3.3 V or 5.0 V (Note 5.), –40°C ≤ T ≤ 125°C, unless otherwise noted.)
DD
A
Characteristic
Symbol
Min
Typ
Max
Unit
Power Supply
Power–On Reset Threshold
V
POR
V
1.2
–
–
2.2
350
10
(V Falling Edge or Rising Edge)
DD
Operating Current
I
mA
mA
DD
200
5.0
(V = 5.5V, Serial Port Inactive) (Note 1.)
DD
Standby Supply Current
I
DD–STANDBY
–
(V = 3.3 V, Serial Port Inactive) (Note 4.)
DD
Temperature–to–Bits Converter
Temperature Accuracy MC74A
T
ERR
°C
–2.0
–3.0
–
–
–
±2.0
+2.0
+3.0
–
+25°C ≤ T ≤ +85°C
A
0°C ≤ T ≤ +125°C
A
–40°C ≤ T ≤ 0°C
A
Conversion Rate (Note 2.)
CR
4.0
8.0
–
sa/sec
Serial Port Interface
Logic Input High
V
0.8 x V
–
–
–
–
V
V
V
IH
DD
Logic Input Low
V
0.2 x V
IL
DD
SDA Output Low
V
OL
–
–
–
–
0.4
0.6
I
OL
I
OL
= 3 mA (Note 3.)
= 6 mA (Note 3.)
Input Capacitance SDA, SCL
I/O Leakage
C
–
5.0
0.1
–
pF
IN
I
–1.0
1.0
mA
LEAK
SERIAL PORT AC TIMING (V = 3.3 V or 5.0 V (Note 5.), –40°C ≤ (T = T ) ≤ 125°C; C = 80 pF unless otherwise noted.)
DD
A
J
L
Characteristic
Symbol
Min
10
Typ
Max
Unit
SMBus Clock Frequency
f
–
100
kHz
SMB
Low Clock Period (10% to 10%)
High Clock Period (90% to 90%)
SMBus Rise Time (10% to 90%)
SMBus Fall Time (90% to 10%)
t
4.7
4.0
–
–
–
–
–
–
–
–
msec
msec
nsec
nsec
msec
LOW
t
HIGH
t
R
1,000
300
–
t
F
–
Start Condition Setup Time (90% SCL to 10% SDA)
(for Repeated Start Condition)
t
4.0
SU(START)
Start Condition Hold Time
Data in Setup Time
t
4.0
1,000
1,250
4.0
–
–
–
–
–
–
–
–
msec
nsec
nsec
msec
msec
msec
H(START)
t
SU–DATA
Data in Hold Time
t
–
H–DATA
Stop Condition Setup Time
Bus Free Time Prior to New Transition
t
–
SU(STOP)
t
4.7
–
IDLE
Power–On Reset Delay (V ≥ V
(Rising Edge))
t
POR
–
500
DD
POR
1. Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.
2. Maximum guaranteed conversion time after Power–On RESET (POR to DATA_RDY) is 250 msec.
3. Output current should be minimized for best temperature accuracy. Power dissipation within the MC74 will cause self–heating and
temperature drift error.
4. SDA and SCL must be connected to V or GND.
DD
5. V = 3.3 V for MC74–33SNTR. V = 5.0 V for MC74–50T. All part types of the MC74 will operate properly over the wider power supply
DD
DD
range of 2.7 V to 5.5 V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As V varies from the nominal
DD
value, accuracy will degrade 1°C/V of V change.
DD
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3
MC74
DETAILED OPERATING DESCRIPTION
MC74 Serial Bus Conventions
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.
Term
Transmitter
Receiver
Master
Explanation
The device sending data to the bus.
The device receiving data from the bus.
The device which controls the bus: initiating
transfers (START), generating the clock, and
terminating transfers (STOP).
Slave
Start
The device addressed by the master.
A unique condition signaling the beginning of a
transfer indicated by SDA falling (High–Low)
while SCL is high.
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.
Stop
ACK
A unique condition signaling the end of a trans-
fer indicated by SDA rising (Low–High) while
SCL is high.
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.
Standby Mode Operation
SHDN Bit
Operating Mode
Normal
0
1
Busy
Communication is not possible because the bus
is in use.
Standby
NOT Busy
Data Valid
When the bus is idle, both SDA and SCL will
remain high.
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).
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).
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:
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).
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4
MC74
Write Byte Format
ADDRESS
ACK
ACK
S
WR
ACK
COMMAND
8 Bits
DATA
P
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.
Read Byte Format
ADDRESS WR ACK
S
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
ADDRESS RD ACK
7 Bits
S
DATA NACK
P
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)
Acknowledge (ACK)
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.
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.
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.
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).
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5
MC74
SMBUS Write Timing Diagram
A
B
C
D
E F
G
H
I
J
K
L
M
I
I
LOW HIGH
SCL
SDA
t
t
t
t
t
t
SU(STOP) IDLE
SU(START) H(START)
SU–DATA
H–DATA
A = Start Condition
F = Acknowledge Bit Clocked into Master J = Acknowledge Clocked into Master
B = MSB of Address Clocked into Slave G= MSB of Data Clocked into Slave
C = LSB of Address Clocked into Slave H = LSB of Data Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
K = Acknowledge Clock Pulse
L = Stop Condition, Data Executed by Slave
M= New Start Condition
I = Slave Pulls SDA Line Low
SMBUS Read Timing Diagram
A
B
C
D
E F
G
H
I
J
K
I
I
LOW HIGH
SCL
SDA
t
t
t
t
t
IDLE
SU(START) H(START)
SU–DATA
SU(STOP)
A = Start Condition
E = Slave Pulls SDA Line Low
I = Acknowledge Clock Pulse
J = Stop Condition
K = New Start Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
F = Acknowledge Bit Clocked into Master
G= MSB of Data Clocked into Master
H = LSB of Data Clocked into Master
Figure 2. Timing Diagrams
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6
MC74
REGISTER SET and PROGRAMMER’S MODEL
Temperature Register (TEMP), 8–Bits,
READ–ONLY
MC74 Command Set
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.
(SMBus READ_BYTE and WRITE_BYTE)
Command Byte Description
Command
RTR
Code
00h
Function
Read Temperature (TEMP)
Read/Write Configuration (CONFIG)
Temperature Register (TEMP)
RWCR
01h
D[7]
D[6]
x
D[5]
x
D[4]
x
D[3]
x
D[2]
x
D[1]
x
D[0]
LSB
MSB
Configuration Register (CONFIG), 8–BITS,
READ/WRITE
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.
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
Temperature–to–Digital Value Conversion (TEMP)
ACTUAL
TEMPERATURE
REGISTERED
TEMPERATURE
D[7]
0
STANDBY
switch
Read/
Write
1 = stand-
by,
BINARY HEX
0111 1111
0111 1111
0111 1111
0001 1001
0000 0001
0000 0000
0000 0000
0000 0000
0000 0000
1111 1111
1111 1111
1110 0111
1110 0110
1100 1001
1100 1001
1011 1111
0 = normal
+130.00°C
+127.00°C
+126.50°C
+25.25°C
+0.50°C
+0.25°C
0.00°C
+127°C
+127°C
+127°C
+25°C
+1°C
0°C
D[6]
0
0
Data Ready*
Read
Only
1 = ready,
0 = not
ready
D[5]–D[0]
Reserved –
Always returns
zero when
read.
N/A
N/A
*DATA_RDY bit reset at power–up and SHDN enable (see below).
0°C
-0.25°C
0°C
-0.50°C
0°C
-0.75°C
-1°C
V
DD
-1.00°C
-1°C
-25.00°C
-25.25°C
-54.75°C
-55.00°C
-65.00°C
-25°C
-25°C
-55°C
-55°C
-65°C
DATA_RDY
SHDN
t
t
conv
conv
Register Set Summary
The MC74’s register set is summarized below. All
registers are 8–bits wide.
Figure 3. DATA_RDY, SHDN Operation Logic Diagram
Name
Description
POR State
Read Write
TEMP
Internal sensor
temperature
0000 0000b*
√
(2’s complement)
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.
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7
MC74
TAPING FORM
Component Taping Orientation for 5L SOT–23 Devices
USER DIRECTION OF FEED
DEVICE
MARKING
PIN 1
Standard Reel Component Orientation
for TR Suffix Device
(Mark Right Side Up)
Tape & Reel Specifications Table
Package
5L SOT–23A
Tape Width (W)
Pitch (P)
Part Per Full Reel
Diameter
8 mm
4 mm
3000
7 inches
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8
MC74
ORDERING INFORMATION AND DEVICE MARKINGS
Device
Marking (xx)
V0
Package
Voltage
Address
1001 000
1001 001
1001 010
1001 011
1001 100
1001 101
1001 110
1001 111
1001 000
1001 001
1001 010
1001 011
1001 100
1001 101
1001 110
1001 111
1001 000
1001 001
1001 010
1001 011
1001 100
1001 101
1001 110
1001 111
1001 000
1001 001
1001 010
1001 011
1001 100
1001 101
1001 110
1001 111
Shipping
MC74A0–3.3SNTR
MC74A1–3.3SNTR
MC74A2–3.3SNTR
MC74A3–3.3SNTR
MC74A4–3.3SNTR
MC74A5–3.3SNTR*
MC74A6–3.3SNTR
MC74A7–3.3SNTR
MC74A0–5.0SNTR
MC74A1–5.0SNTR
MC74A2–5.0SNTR
MC74A3–5.0SNTR
MC74A4–5.0SNTR
MC74A5–5.0SNTR*
MC74A6–5.0SNTR
MC74A7–5.0SNTR
MC74A0–3.3T
V1
V2
V3
3000 Units / Tape & Reel
SOT–23A–5
3.3 V V
5.0 V V
3.3 V V
5.0 V V
DD
DD
DD
DD
V4
V5
V6
V7
U0
U1
U2
U3
U4
U5
U6
U7
V0
SOT–23A–5
TO–220–5
TO–220–5
3000 Units / Tape & Reel
3000 Units / Tape & Reel
3000 Units / Tape & Reel
MC74A1–3.3T
V1
MC74A2–3.3T
V2
MC74A3–3.3T
V3
MC74A4–3.3T
V4
MC74A5–3.3T
V5
MC74A6–3.3T
V6
MC74A7–3.3T
V7
MC74A0–5.0T
U0
U1
U2
U3
U4
U5
U6
U7
MC74A1–5.0T
MC74A2–5.0T
MC74A3–5.0T
MC74A4–5.0T
MC74A5–5.0T*
MC74A6–5.0T
MC74A7–5.0T
*Default voltages and addresses: Contact your ON Semiconductor sales representative for other voltage and address options.
xx
A
= Specific Device Code
= Assembly Location
5
1
SOT–23
SN SUFFIX
CASE 1212
TO–220
T SUFFIX
CASE 314D
MC74xx??
AWLYWW
WL, L = Wafer Lot
= Year
WW = Work Week
xxYW
Y
1
5
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9
MC74
PACKAGE DIMENSIONS
TO–220
T SUFFIX
CASE 314D–04
ISSUE E
SEATING
–T–
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
PLANE
C
–Q–
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION D DOES NOT INCLUDE
INTERCONNECT BAR (DAMBAR) PROTRUSION.
DIMENSION D INCLUDING PROTRUSION SHALL
NOT EXCEED 10.92 (0.043) MAXIMUM.
B
E
A
U
INCHES
DIM MIN MAX
0.613 14.529 15.570
MILLIMETERS
L
MIN MAX
1 2 3 4 5
A
B
C
D
E
G
H
J
0.572
0.390
0.170
0.025
0.048
K
0.415
0.180
0.038
0.055
9.906 10.541
4.318
0.635
1.219
4.572
0.965
1.397
0.067 BSC
1.702 BSC
0.087
0.015
0.990
0.320
0.140
0.105
0.112 2.210
0.025 0.381
2.845
0.635
1.045 25.146 26.543
J
H
G
K
L
D 5 PL
0.365 8.128
0.153 3.556
0.117 2.667
9.271
3.886
2.972
Q
U
M
M
T Q
0.356 (0.014)
SOT–23
SN SUFFIX
CASE 1212–01
ISSUE O
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
A2
B
A
D
S
0.05
3. DATUM C IS A SEATING PLANE.
A1
L
MILLIMETERS
5
1
4
3
DIM MIN
MAX
0.10
1.30
0.50
0.25
3.00
3.10
1.80
E
A1
A2
B
0.00
1.00
0.30
0.10
2.80
2.50
1.50
2
E1
C
C
L1
B
5X
D
E
C
M
S
S
0.10
C B
A
E1
e
e
0.95 BSC
1.90 BSC
e1
L
e1
0.20
0.45
---
0.75
L1
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10
MC74
Notes
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11
MC74
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are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
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specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
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