MIC384
Micrel
MIC384
Three-Zone Thermal Supervisor
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 diodes
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 soft-
ware 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 ad-
dresses available – contact Micrel.) Superior performance,
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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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
Standard
MIC384-0BM
MIC384-1BM
MIC384-2BM
MIC384-3BM
MIC384-0BMM
MIC384-1BMM
MIC384-2BMM
MIC384-3BMM
Pb-Free
Base Address (*) Junction Temp. Range
100 100x
100 101x
100 110x
100 111x
100 100x
100 101x
100 110x
100 111x
-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 SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead SOIC
8-Lead MSOP
8-Lead MSOP
8-Lead MSOP
8-Lead MSOP
Availability
MIC384-0YM
MIC384-1YM
MIC384-2YM
MIC384-3YM
MIC384-0YMM
MIC384-1YMM
MIC384-2YMM
MIC384-3YMM
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
Contact Factory
* 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
/INT
GND
T1
T2
A0
2200pF
REMOTE
DIODE
2200pF
REMOTE
DIODE
3-Channel SMBus Temperature Measurement System
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2005
1
MIC384
MIC384
Micrel
Pin Configuration
DATA
1
8 VDD
7 A0
6 T1
5 T2
CLK 2
/INT 3
GND 4
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 junc-
tion)
Analog Input: Connection to remote temperature sensor (diode junc-
tion)
Digital Input: Slave address selection input. See Table 1. MIC384 Slave
Address Settings.
Analog Input: Power supply input to the IC.
MIC384
2
September 2005
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
I
DD
Parameter
Condition
Power Supply
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
Power-On Reset Time;
Note 7
Power-On Reset Voltage
Power-On Reset
Hysteresis Voltage
Accuracy—Local Temperature
Note 4, 9
3V ≤ V
DD
≤ 3.6V
0°C ≤ T
A
≤ +100°C, /INT open,
3V ≤ V
DD
≤ 3.6V
V
POR
V
HYST
all registers reset to default values,
A/D conversions initiated
V
DD
> V
POR
350
3
1
10
200
2.0
2.7
750
µA
µA
µA
µs
V
Min
Typ
Max
Units
250
±1
±2
±1
±2
50
±2
±3
±3
±5
80
mV
°C
°C
°C
°C
ms
Temperature-to-Digital Converter Characteristics
–55°C ≤ T
A
≤ +125°C, /INT open,
Accuracy—Remote Temperature
Note 5, 4, 9
3V ≤ V
DD
≤ 3.6V, 0°C ≤ T
A
≤ +85°C
Conversion Time, local zone
Note 7, 8
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,
t
CONV0
t
CONV1
Conversion Time, remote zone
Note 7, 8
Current to External Diode
Note 7
Low Input Voltage
High Input Voltage
Input Capacitance
Input Current
high level, T1 or T2 forced to 1.5V
low level
2.7V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 5.5V
7.5
100
224
14
160
400
ms
µA
µA
Remote Temperature Inputs (T1, T2)
I
F
Address Input (A0)
V
IL
0.6
2.0
10
±0.01
±1
V
V
pF
µA
V
IH
C
IN
I
LEAK
September 2005
3
MIC384
MIC384
Symbol
V
OL
V
IL
Parameter
Low Output Voltage
Note 6
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
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
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
I
OL
= 3mA
2.7V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 5.5V
Condition
I
OL
= 3mA
Min
Typ
Max
0.4
0.8
0.7V
DD
0.3V
DD
10
±0.01
±1
0.3V
DD
10
±0.01
±1
0.4
0.8
t
CONV
+1
1
81
76
97
92
97
92
2.5
100
0
100
100
81
76
97
92
97
92
81
76
97
92
97
92
Serial Data I/O Pin (DATA)
Micrel
Units
V
V
V
V
pF
µA
V
V
pF
µA
V
V
µs
µs
°C
°C
°C
°C
°C
°C
µs
ns
ns
ns
ns
I
OL
= 6mA
V
IH
2.7V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 5.5V
C
IN
I
LEAK
V
IL
Serial Clock Input (CLK)
V
IH
0.7V
DD
C
IN
I
LEAK
V
OL
t
INT
t
nINT
Status Output (/INT)
I
OL
= 6mA
T_SET0
T_HYST0
T_SET1
T_HYST1
T_SET2
T_HYST2
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.
Note 9.
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
from TEMPx > T_SETx or TEMPx < T_HYSTx
to /INT < V
OL
, FQ = 00, R
PULLUP
= 10kΩ
Serial Interface Timing (Note 7)
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.
Accuracy specification does not include quantization noise, which may be as great as ±
1
⁄
2
LSB (±0.5°C).
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 2005
MIC384
Micrel
t
1
SCL
t
4
SDA Data In
t
3
SDA Data Out
t
2
t
5
Timing Diagram
Serial Interface Timing
September 2005
5
MIC384
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