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PDF LM70CIMMX-5 Data sheet ( Hoja de datos )
| Número de pieza | LM70CIMMX-5 | |
| Descripción | SPI/MICROWIRE 10-Bit plus Sign Digital Temperature Sensor | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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July 2000
LM70
SPI/MICROWIRE™ 10-Bit plus Sign Digital Temperature
Sensor
General Description
The LM70 is a temperature sensor, Delta-Sigma
analog-to-digital converter with an SPI and MICROWIRE
compatible interface available in LLP and MSOP 8-pin pack-
ages. The host can query the LM70 at any time to read tem-
perature. 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 LM70 has 10-bit plus sign temperature resolution
(0.25˚C per LSB) while operating over a temperature range
of −55˚C to +150˚C.
The LM70’s 2.65V 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 0.25˚C temperature resolution.
n Shutdown mode conserves power between temperature
reading
n SPI and MICROWIRE Bus interface
n MSOP-8 and LLP-8 packages save space
Key Specifications
j Supply Voltage
j Supply Current
j Temperature
Accuracy
operating
shutdown
−40˚C to 85˚C
−10˚C to 65˚C
−55˚C to 125˚C
−55˚C to 150˚C
2.65V to 5.5V
260µA (typ)
490µA (max)
12µA (typ)
±2˚C(max)
+1.5/−2˚C(max)
+3/−2˚C(max)
+3.5/−2˚C(max)
Simplified Block Diagram
MICROWIRE® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101223
DS101223-1
www.national.com
1 page  
Logic Electrical Characteristics (Continued)
SERIAL BUS DIGITAL SWITCHING CHARACTERISTICS
Unless otherwise noted, these specifications apply for V+ = 2.65V to 3.6V for the LM70-3 and V+ = 4.5V to 5.5V for the
LM70-5, CL (load capacitance) on output lines = 100 pF unless otherwise specified. Boldface limits apply for TA = TJ =
TMIN to TMAX; all other limits TA = TJ = +25˚C, unless otherwise noted.
Symbol
Parameter
Conditions
Typical
(Note 7)
Limits
(Note 8)
Units
(Limit)
t1 SC (Clock) Period
0.16 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)
70 ns (max)
200 ns (min)
60 ns (min)
30 ns (min)
FIGURE 2. Data Output Timing Diagram
DS101223-4
FIGURE 3. TRI-STATE Data Output Timing Diagram
DS101223-5
FIGURE 4. Data Input Timing Diagram
5
DS101223-6
www.national.com
5 Page 
4.0 Typical Applications
DS101223-20
FIGURE 8. Temperature monitor using Intel 196 processor
DS101223-19
FIGURE 9. LM70 digital input control using micro-controller’s general purpose I/O.
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LM70CIMMX-5.PDF ] | |
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