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LM77 Datasheet

  • LM77

  • 9-Bit Sign Digital Temperature Sensor and Thermal Window Co...

  • 17頁

  • NSC

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LM77 9-Bit + Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire
Interface
July 2001
LM77
9-Bit + Sign Digital Temperature Sensor and Thermal
Window Comparator with Two-Wire Interface
General Description
The LM77 is a digital temperature sensor and thermal win-
dow comparator with an I
2
C
鈩?/div>
Serial Bus interface. The
window-comparator architecture of the LM77 eases the de-
sign of temperature control systems conforming to the ACPI
(Advanced Configuration and Power Interface) specification
for personal computers. The open-drain Interrupt (INT) out-
put becomes active whenever temperature goes outside a
programmable window, while a separate Critical Tempera-
ture Alarm (T_CRIT_A) output becomes active when the
temperature exceeds a programmable critical limit. The INT
output can operate in either a comparator or event mode,
while the T_CRIT_A output operates in comparator mode
only.
The host can program both the upper and lower limits of the
window as well as the critical temperature limit. Program-
mable hysterisis as well as a fault queue are available to
minimize false tripping. Two pins (A0, A1) are available for
address selection. The sensor powers up with default thresh-
olds of 2藲C T
HYST
, 10藲C T
LOW
, 64藲C T
HIGH
, and 80藲C
T_CRIT.
The LM77鈥檚 3.0V to 5.5V supply voltage range, Serial Bus
interface, 9-bit + sign output, and full-scale range of over
128藲C make it ideal for a wide range of applications. These
include thermal management and protection applications in
personal computers, electronic test equipment, office elec-
tronics, automotive, and HVAC applications.
Features
n
Window comparison simplifies design of ACPI
compatible temperature monitoring and control.
n
Serial Bus interface
n
Separate open-drain outputs for Interrupt and Critical
Temperature shutdown
n
Shutdown mode to minimize power consumption
n
Up to 4 LM77s can be connected to a single bus
n
9-bit + sign output; full-scale reading of over 128藲C
n
SOP and MSOP 8-lead packages
Key Specifications
j
Supply Voltage
j
Supply Current
3.0V to 5.5V
operating
shutdown
250 碌A(chǔ) (typ)
500 碌A(chǔ) (max)
5 碌A(chǔ) (typ)
j
Temperature
鈭?0藲C to 65藲C
鈭?5藲C to 100藲C
鈭?5藲C to 125藲C
鹵
1.5藲C(max)
鹵
2藲C(max)
鹵
3藲C(max)
Accuracy
Applications
n
n
n
n
n
n
System Thermal Management
Personal Computers
Office Electronics
Electronic Test Equipment
Automotive
HVAC
I2C
廬
is a registered trademark of Philips Corporation.
漏 2001 National Semiconductor Corporation
DS100136
www.national.com

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