MIC184
Micrel
MIC184
Local/Remote Thermal Supervisor
Advance Information
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 measure-
ment 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 overtem-
perature alarm or thermostatic control signal. Three program-
mable address 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
demanding 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
Temperature Range
–55°C to +125°C
–55°C to +125°C
Package
8-lead SOP
8-lead MSOP
Typical Application
3.0V to 3.6V
V
DD
Data
Clock
Interrupt
FROM
SERIAL BUS
HOST
3
×
10k
MIC184
8
1
2
3
VDD
DATA
CLK
INT
A2/T1
A1
A0
GND
5
6
7
4
0.1µF
ceramic
2200pF
OPTIONAL
REMOTE
TEMPERATURE
SENSOR
2-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
November 2000
1
MIC184
MIC184
Micrel
Pin Configuration
DATA 1
CLK 2
INT 3
GND 4
8 VDD
7 A0
6 A1
5 A2/T1
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
Address 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
Address Truth Table.”
Address Bit 0 (Digital Input): Slave address selection input. See “Slave
Address Truth Table.”
Supply (Analog Input): Power supply input to the IC.
MIC184
2
November 2000
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 .................................................. 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, 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
V
POR
V
HYST
Power-On Reset Time
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, 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
t
CONV
Conversion Time,
Note 5
local temperature
remote temperature
Remote Temperature Input (T1)
I
F
Current to External Diode
Note 5
high level
low level
2.7V
≤
V
DD
≤
5.5V
2.7V
≤
V
DD
≤
5.5V
2.0
10
±0.01
A2 = V
DD
, flows for t
POR
at power-up
25
7.5
224
14
400
µA
µA
V
DD
> V
POR
all registers reset to default values,
A/D conversions initiated
340
2.5
1
15
2.0
250
±1
±2
±1
±2
100
200
TBD
100
2.7
TBD
µA
µA
µA
µs
V
mV
Parameter
Condition
Min
Typ
Max
Units
Temperature-to-Digital Converter Characteristics
Accuracy—Local Temperature
Note 5, 6
±
2
±
3
±
3
±
5
160
320
°C
°C
°C
°C
ms
ms
Address Inputs (A2/T1, A1, A0)
V
IL
V
IH
C
IN
I
LEAK
I
PD
Low Input Voltage
High Input Voltage
Input Capacitance
Input Current
Pulldown Current on A2/T1
0.6
V
V
pF
±
1
µA
µA
November 2000
3
MIC184
MIC184
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_SET
HYST
Low Output Voltage
I
OL
= 3mA
I
OL
= 6mA
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
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 8
Interrupt Propagation Delay,
Note 5
Interrupt Reset Propagation Delay,
Note 5
Default T_SET Value
Default HYST Value
I
OL
= 3mA
I
OL
= 6mA
from TEMP > T_SET, FQ = 00 to INT < V
OL
,
R
PULLUP
= 10kΩ; POL bit = 0
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
80
75
80
75
V
V
µs
µs
°C
°C
µs
ns
ns
ns
ns
80
75
Serial Interface Timing (Note 5)
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.
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.
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
t
1
SCL
t
4
SDA Input
t
3
SDA Output
t
2
t
5
Serial Interface Timing
MIC184
4
November 2000
MIC184
Micrel
Typical Characteristics
Local Temperature
Measurement Error
3
MESUREMENT ERROR (°C)
MESUREMENT ERROR (°C)
Remote Temperature
Measurement Error
5
SUPPLY CURRENT (µA)
500
450
400
350
300
250
200
150
100
Operating I
DD
vs. Temperature
V
DD
= 5.0V
V
DD
= 3.3V
2
1
0
-1
-2
-60
4
3
2
1
0
-1
-2
-3
-4 V
DD
= 3.3V
-5
-60
-40
-20
V
DD
= 3.3V
0
20
40
60
80
-40
-20
100
120
140
0
20
40
60
80
0
20
40
-60
-40
100
120
140
-20
60
80
100
LOCAL DIODE TEMERATURE (°C)
REMOTE DIODE TEMERATURE (°C)
TEMPERATURE (°C)
9
SHUTDOWN CURRENT (µA)
Shutdown I
DD
vs. Frequency
SHUTDOWN CURRENT (µA)
3.5
3
2.5
2
1.5
1
0.5
-60
Shutdown Mode I
DD
vs. Temperature
V
DD
= 5.0V
QUIESCENT CURRENT (µA)
Shutdown Mode IDD
vs. Suply Voltage
400
350
300
250
200
150
100
50
0
0
2
4
SUPPLY VOLTAGE (V)
6
8
7
6
5
4
3
2
1
0
0 50 100 150 200 250 300 350 400
CLOCK FREQUENCY (kHz)
V
DD
= 5.0V
V
DD
= 3.0V
f
CLOCK
= 0Hz
V
DD
= 3.3V
0
20
40
-40
-20
60
80
100
120
140
0
TEMPERATURE (°C)
MEASURED LOCAL TEMPERATURE (°C)
Response to Immersion in
125°C Fluid Bath
140
120 MSOP-8
100
80
60
40
20
0
0
5
10
TIME (Sec)
15
SOIC-8
Measurement Error vs.
PCB Leakage to +5V/+3.3V/GND
5
MEASUREMENT ERROR (°C)
Measurment Error vs.
Capcitance on T1
0
MEASURMENT ERROR (°C)
0
-5
-10
-15
-20
-25
3.3V
GND
-2
-4
-6
-8
-10
-12
0 1 2 3 4 5 6 7 8 9 10
CAPACITANCE (nF)
5.0V
-30
1x10
6
1x10
7
1x10
8
1x10
9
RESISTANCE FROM T1(Ω)
November 2000
5
120
140
-3
50 f
CLOCK
= 0Hz
0
MIC184
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