MIC280
Precision IttyBitty Thermal Supervisor
General Description Features
The MIC280 is a digital thermal supervisor capable of Measures local and remote temperature
measuring its own internal temperature and that of a
Highly accurate remote sensing: 1C max., 60C to
remote PN junction. The remote junction may be an
100C
inexpensive commodity transistore.g., 2N3906or an
Superior noise immunity for reduced temperature
embedded thermal diode such as those found in Intel
guardbands
Pentium II/III/IV CPUs, AMD Athlon CPUs, and Xilinx
9-bit to 12-bit temperature resolution for remote zone
Virtex FPGAs. A 2-wire SMBus 2.0-compatible serial
interface is provided for host communication. Remote Fault queues to further reduce nuisance tripping
temperature is measured with 1C accuracy and 9-bit to
Programmable high, low, and overtemperature
12-bit resolution (programmable). Independent high, low,
thresholds for each zone
and overtemperature thresholds are provided for each
SMBus 2.0-compatible serial interface including device
zone.
timeout to prevent bus lockup
The advanced integrating A/D converter and analog front-
Voltage-tolerant I/Os
end reduce errors due to noise for maximum accuracy and
Open-drain interrupt output pin supports SMBus Alert
minimum guardbanding. The interrupt output signals
Response Address protocol
temperature events to the host, including data-ready and
Low power shutdown mode
diode faults. Critical device settings can be locked to
Locking of critical functions to ensure failsafe operation
prevent changes and ensure failsafe operation. The clock,
data, and interrupt pins are 5V-tolerant regardless of the
Failsafe response to diode faults
value of V . They will not clamp the bus lines low even if
DD
Enables ACPI-compliant thermal management
the device is powered down. Superior accuracy, failsafe
3.0V to 3.6V power supply range
operation, and small size make the MIC280 an excellent
Available in IttyBitty SOT23-6 package
choice for the most demanding thermal management
applications.
Applications
Datasheets and support documentation are available on
Desktop, server, and notebook computers
Micrels web site at: www.micrel.com.
Printers and copiers
Test and measurement equipment
Thermal supervision of Xilinx Virtex FPGAs
Wireless/RF systems
Intelligent power supplies
Datacom/telecom cards
Typical Application
IttyBitty is a trademark of Micrel, Inc. All other trademarks are the property of their respective owners.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC280
Ordering Information
Part Number Marking Slave Address Ambient Temp. Range Package
MIC280-0YM6 TA00 100 1000 55 to +125C SOT23-6
b
MIC280-1YM6 TA01 100 1001 55 to +125C SOT23-6
b
MIC280-2YM6 TA02 100 1010 55 to +125C SOT23-6
b
MIC280-3YM6 TA03 100 1011 55 to +125C SOT23-6
b
MIC280-4YM6 TA04 100 1100 55 to +125C SOT23-6
b
MIC280-5YM6 TA05 100 1101 55 to +125C SOT23-6
b
MIC280-6YM6 TA06 100 1110 55 to +125C SOT23-6
b
MIC280-7YM6 TA07 100 1111 55 to +125C SOT23-6
b
Note:
1. Underbar (_) may not be to scale.
Pin Configuration
SOT23-6 (M6)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 VDD Power supply input.
2 GND Ground.
3 T1 Analog input. Connection to remote diode junction.
4 CLK Digital input. Serial bit clock input.
5 DATA Digital input/output. Open-drain. Serial data input/output.
6 /INT Digital output. Open-drain. Interrupt output.
Revision 2.0
May 5, 2014 2