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PDF LM74CIMX-5 Data sheet ( Hoja de datos )
| Número de pieza | LM74CIMX-5 | |
| Descripción | SPI/MICROWIRE Digital Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 1999
LM74
SPI/MICROWIRE™ Digital Temperature Sensor
General Description
The LM74 is a temperature sensor, Delta-Sigma
analog-to-digital converter with an SPI and MICROWIRE
compatible interface. The host can query the LM74 at any
time to read temperature. A shutdown mode decreases
power consumption to less than 10 µA. This mode is useful
in systems where low average power consumption is critical.
The LM74 has 12-bit plus sign temperature resolution
(0.0625˚C per LSB) while operating over a temperature
range of −55˚C to +150˚C.
The LM74’s 3.0V to 5.5V supply voltage range, low supply
current and simple SPI interface make it ideal for a wide
range of applications. These include thermal management
and protection applications in hard disk drives, printers, elec-
tronic test equipment, and office electronics.
Applications
n System Thermal Management
n Personal Computers
n Disk Drives
n Office Electronics
n Electronic Test Equipment
Features
n 0.0625˚C temperature resolution.
n Shutdown mode conserves power between temperature
reading
n SPI and MICROWIRE Bus interface
n SO-8 package saves space
Key Specifications
n Supply Voltage
n Supply Current
n Temperature
Accuracy
operating
shutdown
−10˚C to 65˚C
−25˚C to 110˚C
−55˚C to 125˚C
3.0V to 5.5V
310 µA (typ)
520 µA (max)
7 µA (typ)
±1.25˚C(max)
±2.1˚C(max)
±3˚C(max)
Simplified Block Diagram
MICROWIRE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS100909
DS100909-1
www.national.com
1 page  
Logic Electrical Characteristics (Continued)
SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS
Unless otherwise noted, these specifications apply for V+ = 3.0V to 3.6V for the LM74CIM-3 and V+ = 4.5V to 5.5V for the
TLMMI7N4tCoIMTM-5A,XC; Lal(llooathdecralipmaictsitaTnAce=)
on
TJ
output lines = 100 pF unless otherwise
= +25˚C, unless otherwise noted.
specified.
Boldface
limits
apply
for
TA
=
TJ
=
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
t1 SC (Clock) Period
0.33 µs (min)
DC (max)
t2 CS Low to SC (Clock) High Set-Up Time
t3 CS Low to Data Out (SO) Delay
t4 SC (Clock) Low to Data Out (SO) Delay
t5 CS High to Data Out (SO) TRI-STATE
t6 SC (Clock) High to Data In (SI) Hold Time
t7 Data In (SI) Set-Up Time to SC (Clock) High
100 ns (max)
70 ns (max)
100 ns (max)
200 ns (min)
50 ns (min)
30 ns (min)
FIGURE 2. Data Output Timing Diagram
DS100909-4
FIGURE 3. TRI-STATE Data Output Timing Diagram
DS100909-5
5 www.national.com
5 Page 
4.0 Typical Applications
DS100909-20
FIGURE 8. Temperature monitor using Intel 196 processor
DS100909-19
FIGURE 9. LM74 digital input control using micro-controller’s general purpose I/O.
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM74CIMX-5.PDF ] | |
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