MIC384
Micrel
MIC384
Three-Zone Thermal Supervisor
Advance Information
General Description
The MIC384 is a versatile digital thermal supervisor capable
of measuring temperature using its own internal sensor and
two inexpensive external sensors or embedded silicon di-
odes such as those found in the Intel Pentium III* CPU. A 2-
wire serial interface is provided to allow communication with
either I
2
C** or SMBus* masters. The open-drain interrupt
output pin can be used as either an over-temperature alarm
or a thermostatic control signal.
Interrupt mask and status bits are provided for reduced
software overhead. Fault queues prevent nuisance tripping
due to thermal or electrical noise. A programmable address
pin permits two devices to share the bus. (Alternate base
addresses available – contact Micrel.) Superior perfor-
mance, low power and small size makes the MIC384 an
excellent choice for multiple zone thermal management
applications.
*SMBus and Pentium III are trademarks of Intel Corporation.
**I
2
C is a trademark of Philips Electronics, N.V.
Features
•
•
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•
•
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•
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Measures Local and Two Remote Temperatures
2-Wire SMBus-compatible Interface
Programmable Thermostat Settings for All Three Zones
Open-Drain Interrupt Output Pin
Interrupt Mask and Status Bits
Fault Queues to Prevent Nuisance Tripping
Low Power Shutdown Mode
Failsafe response to diode faults
2.7V to 5.5V Power Supply Range
8-Lead SOIC and MSOP Packages
Desktop, Server and Notebook Computers
Power Supplies
Test and Measurement Equipment
Wireless Systems
Networking/Datacom Hardware
Applications
Ordering Information
Part Number
MIC384-0BM
MIC384-1BM
MIC384-2BM
MIC384-3BM
MIC384-0BMM
MIC384-1BMM
MIC384-2BMM
MIC384-3BMM
Base Address
(
*
)
100 100x
100 101x
100 110x
100 111x
100 100x
100 101x
100 110x
100 111x
Junction Temp. Range
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
Package
8-Lead SOP
8-Lead SOP
8-Lead SOP
8-Lead SOP
8-Lead MSOP
8-Lead MSOP
8-Lead MSOP
8-Lead MSOP
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Notes
* The least-significant bit of the slave address is determined by the state of the A0 pin.
Typical Application
3.3V
3
×
10k
pull-ups
FROM
SERIAL BUS
HOST
0.1µF
MIC384
DATA
VDD
CLK
T1
/INT
T2
GND
A0
REMOTE
DIODE
2200pF
REMOTE
DIODE
2200pF
3-Channel SMBus Temperature Measurement System
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
September 2000
1
MIC384
MIC384
Micrel
Pin Configuration
DATA 1
CLK 2
/INT 3
GND 4
8 VDD
7 A0
6 T1
5 T2
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
DATA
CLK
/INT
GND
T2
T1
A0
VDD
Pin Function
Digital I/O: Open-drain. Serial data input/output.
Digital Input: The host provides the serial bit clock on this input.
Digital Output: Open-drain. Interrupt or thermostat output.
Ground: Power and signal return for all IC functions.
Analog Input: Connection to remote temperature sensor (diode junction)
Analog Input: Connection to remote temperature sensor (diode junction)
Digital Input: Slave address selection input. See Table 1. MIC284 Slave
Address Setings.
Analog Input: Power supply input to the IC.
MIC384
2
September 2000
MIC384
Micrel
Absolute Maximum Ratings
(Note 1)
Power Supply Voltage, V
DD ...................................................
6.0V
Voltage on Any Pin ................................ –0.3V to V
DD
+0.3V
Current Into Any Pin .................................................
±10mA
Power Dissipation, T
A
= +125°C ............................... 30mW
Junction Temperature ............................................. +150°C
Storage Temperature ............................... –65°C to +150°C
ESD Ratings
(Note 3)
Human Body Model .................................................. TBD V
Machine Model ......................................................... TBD V
Soldering
Vapor Phase (60 sec.) ............................. +220°C
+5
⁄
–0
°C
Infrared (15 sec.) ...................................... +235°C
+5
⁄
–0
°C
Operating Ratings
(Note 2)
Power Supply Voltage, V
DD ..............................
+2.7V to +5.5V
Ambient Temperature Range (T
A
) ............ -55°C to +125°C
Package Thermal Resistance (θ
JA
)
SOP .................................................................+152°C/W
MSOP .............................................................. +206°C/W
Electrical Characteristics
2.7V
≤
V
DD
≤
5.5; T
A
= +25°C,
bold
values indicate –55°C
≤
T
A
≤
+125°C,
Note 4;
unless noted.
Symbol
Power Supply
I
DD
Supply Current
/INT, open, A0 = V
DD
or GND,
CLK = DATA = high, normal mode
/INT, open, A0 = V
DD
or GND,
shutdown mode, CLK = 100kHz
/INT, open, A0 = V
DD
or GND,
shutdown mode, CLK = DATA = high
t
POR
V
POR
V
HYST
Power-On Reset Time;
Note 7
Power-On Reset Voltage
Power-On Reset Hysteresis Voltage
0°C
≤
T
A
≤
+100°C, /INT open,
3V
≤
V
DD
≤
3.6V
–55°C
≤
T
A
≤
+125°C, /INT open,
3V
≤
V
DD
≤
3.6V
Accuracy—Remote Temperature
Note 5, 4, 9
0°C
≤
T
D
≤
+100°C, /INT open,
3V
≤
V
DD
≤
3.6V, 0°C
≤
T
A
≤
+85°C
–55°C
≤
T
D
≤
+125°C, /INT open,
3V
≤
V
DD
≤
3.6V, 0°C
≤
T
A
≤
+85°C
t
CONV0
t
CONV1
Conversion Time, local zone
Note 7, 8
Conversion Time, remote zone
Note 7, 8
V
DD
> V
POR
all registers reset to default values,
A/D conversions initiated
2.0
250
±1
±2
±1
±2
50
350
3
1
10
200
2.7
750
µA
µA
µA
µs
V
mV
Parameter
Condition
Min
Typ
Max
Units
Temperature-to-Digital Converter Characteristics
Accuracy—Local Temperature
Note 4, 9
±
2
±
3
±
3
±
5
80
°C
°C
°C
°C
ms
100
160
ms
µA
µA
Remote Temperature Inputs (T1, T2)
I
F
Current to External Diode
Note 7
high level, T1 or T2 forced to 1.5V
low level
2.7V
≤
V
DD
≤
5.5V
2.7V
≤
V
DD
≤
5.5V
2.0
10
±0.01
7.5
224
14
400
Address Input (A0)
V
IL
V
IH
C
IN
I
LEAK
Low Input Voltage
High Input Voltage
Input Capacitance
Input Current
0.6
V
V
pF
±
1
µA
September 2000
3
MIC384
MIC384
Symbol
Parameter
Condition
Min
Typ
Max
Micrel
Units
Serial Data I/O Pin (DATA)
V
OL
V
IL
V
IH
C
IN
I
LEAK
V
IL
V
IH
C
IN
I
LEAK
V
OL
t
INT
t
nINT
T_SET0
T_HYST0
T_SET1
T_HYST1
T_SET2
T_HYST2
Low Output Voltage
Note 6
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
2.7V
≤
V
DD
≤
5.5V
2.7V
≤
V
DD
≤
5.5V
0.7V
DD
10
±0.01
I
OL
= 3mA
I
OL
= 6mA
2.7V
≤
V
DD
≤
5.5V
2.7V
≤
V
DD
≤
5.5V
0.7V
DD
10
±0.01
0.4
0.8
0.3V
DD
V
V
V
V
pF
±
1
0.3V
DD
µA
Serial Clock Input (CLK)
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
V
V
pF
±
1
0.4
0.8
t
CONV
+1
1
µA
Status Output (/INT)
Low Output Voltage,
Note 6
Interrupt Propagation Delay,
Note 7, 8
Interrupt Reset Propagation Delay,
Note 7
Default T_SET0 Value
Default T_HYST0 Value
Default T_SET1 Value
Default T_HYST1 Value
Default T_SET2 Value
Default T_HYST2 Value
I
OL
= 3mA
I
OL
= 6mA
from TEMPx > T_SETx or TEMPx < T_HYSTx
to /INT < V
OL
, FQ = 00, R
PULLUP
= 10kΩ
from any register read to /INT > V
OH
,
R
PULLUP
= 10kΩ
t
POR
after V
DD
> V
POR
t
POR
after V
DD
> V
POR
t
POR
after V
DD
> V
POR
t
POR
after V
DD
> V
POR
t
POR
after V
DD
> V
POR
t
POR
after V
DD
> V
POR
81
76
97
92
97
92
81
76
97
92
97
92
V
V
µs
µs
°C
°C
°C
°C
°C
°C
µs
ns
ns
ns
ns
81
76
97
92
97
92
Serial Interface Timing (Note 7)
t
1
t
2
t
3
t
4
t
5
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Note 7.
Note 8.
CLK (Clock) Period
Data In Setup Time to CLK High
Data Out Stable After CLK Low
DATA Low Setup Time to CLK Low
DATA High Hold Time
After CLK High
start condition
stop condition
2.5
100
0
100
100
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Human body model: 1.5k in series with 100pF. Machine model: 200pF, no series resistance.
Final test on outgoing product is performed at T
A
= TBD°C.
T
D
is the temperature of the remote diode junction. Testing is performed using a single unit of one of the transistors listed in Table 6.
Current into this pin will result in self-heating of the MIC384. Sink current should be minimized for best accuracy.
Guaranteed by design over the operating temperature range. Not 100% production tested.
t
CONV
= t
CONV0
+(2 X t
CONV1
). t
CONV0
is the conversion time for the local zone; t
CONV1
is the conversion time for the remote zones.`
MIC384
4
September 2000
MIC384
Note 9.
Accuracy specification does not include quantization noise, which may be as great as
±
1
⁄
2
LSB (±0.5°C).
Micrel
Timing Diagram
t
1
SCL
t
4
SDA Data In
t
3
SDA Data Out
t
2
t
5
Serial Interface Timing
September 2000
5
MIC384
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