MIC184
Micrel
MIC184
Local/Remote Thermal Supervisor
General Description
The MIC184 is a versatile digital thermal supervisor capable
of measuring temperature using either its own internal sensor
or an inexpensive external sensor. A 2-wire serial interface is
provided to allow communication with either I
2
C or SMBus
masters. This device is a pin-for-pin and software compatible
upgrade for the industry standard LM75.
Additional features include remote temperature measurement
capability, and interrupt status and mask bits in the chip’s
configuration register for software polling. The open-drain
interrupt output pin can be used as either an overtemperature
alarm or thermostatic control signal. Three programmable ad-
dress pins permit users to multidrop up to 8 devices along the
2-wire bus, allowing simple distributed temperature sensing
networks. Superior performance, low power and small size
makes the MIC184 an excellent choice for the most demand-
ing thermal management applications.
Features
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Measures local and remote temperatures
Pin and software backward compatible to LM75
9-bit sigma-delta ADC
2-wire I
2
C/SMBus compatible interface
Programmable thermostatic settings for either internal or
external zone
Open-drain comparator/interrupt output pin
Interrupt mask and status bits
Low-power shutdown mode
Fail-safe response to diode faults
2.7V to 5.5V power supply range
Up to 8 devices may share the same bus
8-Lead SOP and MSOP Packages
Desktop, Server and Notebook Computers
Printers and Copiers
Test and measurement equipment
Consumer electronics
Applications
Ordering Information
Part Number
MIC184BM
MIC184BMM
MIC184YM
MIC184YMM
Temperature Range
-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 MSOP
8-lead SOIC
8-lead MSOP
X
X
Pb-FREE
Typical Application
3.0V to 3.6V
V
DD
Data
Clock
Interrupt
FROM
SERIAL BUS
HOST
3×
10k
8
1
2
3
MIC184
VDD
A2/T1
DATA
A1
CLK
INT
A0
GND
5
6
7
4
0.1µF
ceramic
2200pF
OPTIONAL
REMOTE
TEMPERATURE
SENSOR
2-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
May 2006
1
MIC184
MIC184
Micrel
Pin Configuration
DATA
1
8 VDD
7 A0
6 A1
5 A2/T1
CLK 2
INT 3
GND 4
Pin Description
Pin Number
1
2
3
4
5
Pin Name
DATA
CLK
INT
GND
A2/T1
Pin Function
Data (Digital I/O): Open-drain. Serial data input/output.
Clock (Digital Input): The host provides the serial bit clock on this input.
Interrupt (Digital Output): Open-drain. Interrupt or thermostat output.
Ground: Power and signal return for all IC functions.
Address Bit 2 (Digital Input): Slave address selection input. See “Slave Ad-
dress Truth Table.”
Temperature Sensor 1 (Analog Input): Input from remote temperature sensor
(diode junction).
6
7
8
A1
A0
VDD
Address Bit 1 (Digital Input): Slave address selection input. See “Slave Ad-
dress Truth Table.”
Address Bit 0 (Digital Input): Slave address selection input. See “Slave Ad-
dress Truth Table.”
Supply (Analog Input): Power supply input to the IC.
MIC184
2
May 2006
MIC184
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 ................................................... ±6mA
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 ..................................................... 700V
Machine Model ............................................................ 100V
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, A2, A1, A0 = V
DD
or GND,
CLK = DATA = high, normal mode
shutdown mode, CLK = 100kHz
INT open, A2, A1, A0 = V
DD
or GND,
CLK = DATA = high, shutdown mode
t
POR
Power-On Reset Time
Power-On Reset Voltage
Power-On Reset
Hysteresis Voltage
Accuracy—Local Temperature
Note 5, 6
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
340
2.5
1
15
2.0
10
100
2.7
500
µA
µA
µA
µs
V
Min
Typ
Max
Units
250
±1
±2
±1
±2
100
200
224
7.5
14
0.6
2.0
10
±0.01
A2 = V
DD
, flows for t
POR
at power-up
25
±1
±2
±3
±3
±5
160
320
400
mV
°C
°C
°C
°C
ms
ms
µA
µA
V
V
pF
µA
µA
Temperature-to-Digital Converter Characteristics
Accuracy—Remote Temperature
Note 5, 6, 7
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
remote temperature
–55°C ≤ T
A
≤ +125°C, INT open,
3V ≤ V
DD
≤ 3.6V
t
CONV
Conversion Time,
Note 5
local temperature
Remote Temperature Input (T1)
I
F
Current to External Diode
Note 5
Low Input Voltage
High Input Voltage
Input Capacitance
Input Current
Pulldown Current on A2/T1
high level
low level
2.7V ≤ V
DD
≤ 5.5V
Address Inputs (A2/T1, A1, A0)
V
IL
V
IH
2.7V ≤ V
DD
≤ 5.5V
C
IN
I
PD
I
LEAK
May 2006
3
MIC184
MIC184
Symbol
V
OL
V
IL
Parameter
Low Output Voltage
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
Low Input Voltage
High Input Voltage
Input Capacitance
Input current
Low Output Voltage,
Note 8
Interrupt Propagation Delay,
Note 5
Interrupt Reset Propagation Delay,
Note 5
Default T_SET Value
Default HYST 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
80
75
2.5
100
0
100
100
80
75
80
75
Serial Data I/O Pin (DATA)
Micrel
Units
V
V
V
V
pF
µA
V
V
pF
µA
V
V
µs
µs
°C
°C
µs
ns
ns
ns
ns
V
IH
2.7V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 5.5V
I
OL
= 6mA
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_SET
HYST
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 > VOH,
R
PULLUP
= 10kΩ; POL bit = 0
t
POR
after V
DD
> V
POR
,
Note 9
t
POR
after V
DD
> V
POR
,
Note 9
from TEMP > T_SET, FQ = 00 to INT < V
OL
,
R
PULLUP
= 10kΩ; POL bit = 0
Serial Interface Timing (Note 5)
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.
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 (±
1
⁄
4
°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 5.
Current into the INT pin will result in self-heating of the MIC184. INT pin current should be minimized for best accuracy.
This is the decimal representation of a binary data value.
Timing Diagram
SCL
t
4
SDA Input
t
1
t
2
t
3
SDA Output
t
5
Serial Interface Timing
MIC184
4
May 2006
MIC184
Micrel
Typical Characteristics
L oc al T emperature
Meas urement E rror
R emote T emperature
Meas urement E rror
Operating I
DD
vs . T emperature
V
DD
= 5.0V
V
DD
= 3.3V
3
2
MESUREMENT ERROR (°C)
MESUREMENT ERROR (°C)
5
4
3
2
1
0
-1
-2
-3
-4
-5
500
450
400
SUPPLY CURRENT (µA)
350
300
250
200
150
100
1
0
-1
-2
-3
V
DD
= 3.3V
V
DD
= 3.3V
140
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
0
20
40
60
80
100
120
-60
-40
-20
LOCAL DIODE TEMERATURE (°C)
REMOTE DIODE TEMERATURE (°C)
TEMPERATURE (°C)
9
8
SHUTDOWN CURRENT (µA)
7
6
5
4
3
2
1
0
0
S hutdown I
DD
vs . F requenc y
SHUTDOWN CURRENT (µA)
3.5
3
2.5
2
1.5
1
0.5
0
S hutdown Mode I
DD
vs . T emperature
V
DD
= 5.0V
SUPPLY CURRENT (µA)
400
350
300
250
200
150
100
50
0
0
S upply C urrent
vs . S uppl
y
V oltage
V
DD
= 5.0V
V
DD
= 3.0V
f
C LOC K
= 0Hz
V
DD
= 3.3V
120
140
50 100 150 200 250 300 350 400
CLOCK FREQUENCY (kHz)
TEMPERATURE (°C)
2
4
SUPPLY VOLTAGE (V)
140
MEASURED LOCAL TEMPERATURE (°C)
R es pons e to Immers ion in
125°C F luid B ath
-60
-40
-20
0
20
40
60
80
100
Meas urement E rror vs .
P C B L eakage to +5V /+3.3V /G ND
5
0
MEASUREMENT ERROR (°C)
0
-2
MEASURMENT ERROR (°C)
Meas urment E rror vs .
C apc itanc e on T 1
120
MS OP -8
100
80
60
40
20
0
0
10
5
TIME (Sec)
15
G ND
S OIC -8
-5
-10
-15
-20
-25
3.3V
5.0V
-4
-6
-8
-10
-12
0 1 2 3 4 5 6 7 8 9 10
CAPACITANCE (nF)
-30
1x10
6
1x10
7
1x10
8
RESISTANCE FROM T1(Ω)
1x10
9
May 2006
5
140
6
50
f
C LOC K
= 0Hz
0
MIC184
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