(derated at 33.3mW/°C above +70°C)................2666.7mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +85°C.) (Note 1)
PARAMETER
Operating Supply Voltage Range
Standby Current
Operating Current
External Temperature Error
MAX6639AEE, MAX6639ATE:
n = 1.008
MAX6639FAEE: n = 1.021
Internal Temperature Error
MAX6639AEE, MAX6639ATE
Internal Temperature Error
MAX6639FAEE
Supply Sensitivity of Temperature
Measurement
Temperature Resolution
Conversion Time
Conversion-Rate Timing Error
PWM Frequency Error
Tachometer Accuracy
Remote-Diode Sourcing Current
DXN Source Voltage
T
A
= +60°C to +100°C
High level
Low level
70
7.0
100
10
0.7
-10
-10
SYMBOL
V
CC
SMB static, sleep mode
Interface inactive, ADC active
V
CC
= +3.3V, +60°C
≤
T
A
≤
+100°C and
+60°C
≤
T
R
≤
+100°C
V
CC
= +3.3V, +40°C
≤
T
A
≤
+100°C and
0°C
≤
T
R
≤
+145°C
V
CC
= +3.3V, 0°C
≤
T
R
≤
+145°C
V
CC
= +3.3V, +25°C
≤
T
A
≤
+100°C
V
CC
= +3.3V, 0°C
≤
T
A
≤
+125°C
V
CC
= +3.3V, +25°C
≤
T
A
≤
+100°C
V
CC
= +3.3V, 0°C
≤
T
A
≤
+125°C
-1.0
-2.5
-3.8
-2.0
-4.0
-7.7
-10.4
±0.2
+0.125
11
125
+10
+10
±3
130
13.0
CONDITIONS
MIN
+3.0
3
0.5
TYP
MAX
+3.6
10
1
+1.0
+2.5
+3.8
+2.0
+4.0
-2.5
-0.1
°C
°C
°C/V
°C
Bits
ms
%
%
%
µA
V
°C
UNITS
V
µA
mA
2
Maxim Integrated
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +85°C.) (Note 1)
PARAMETER
DIGITAL INPUTS AND OUTPUTS
Output Low Voltage (Sink
Current) (OT,
ALERT, FANFAIL,
THERM,
SDA, PWM1, and PWM2)
Output High Leakage Current
(OT,
ALERT, FANFAIL, THERM,
SDA, PWM1, and PWM2)
Logic-Low Input Voltage (SDA,
SCL,
THERM,
TACH1, TACH2)
Logic-High Input Voltage (SDA,
SCL,
THERM,
TACH1, TACH2)
Input Leakage Current (SDA,
SCL,
THERM,
TACH1, TACH2)
Input Capacitance
SMBus TIMING
(Note 2)
Serial Clock Frequency
Clock Low Period
Clock High Period
Bus Free Time Between STOP
and START Conditions
SMBus START Condition Setup
Time
START Condition Hold Time
STOP Condition Setup Time
Data Setup Time
Data Hold Time
SMBus Fall Time
SMBus Rise Time
SMBus Timeout
f
SCL
t
LOW
t
HIGH
t
BUF
t
SU:STA
t
HD:STO
t
SU:STO
t
SU:DAT
t
HD:DAT
t
F
t
R
t
TIMEOUT
58
74
90% of SMBCLK to 90% of SMBDATA
10% of SDA to 10% of SCL
90% of SCL to 10% of SDA
10% of SDA to 10% of SCL
10% of SCL to 10% of SDA (Note 4)
(Note 3)
10% to 10%
90% to 90%
10
4
4.7
4.7
4.7
4
4
250
300
300
1000
90
100
kHz
µs
µs
µs
µs
µs
µs
ns
ns
ns
ns
ms
C
IN
V
OL
ALERT, FANFAIL, THERM, OT,
SDA
I
SINK
= 6mA
PWM1, PWM2, I
SINK
= 4mA
I
OH
0.4
0.4
1
µA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
IL
0.8
V
V
IH
V
CC
= 3.3V
V
IN
= V
CC
or GND
2.1
1
5
V
µA
pF
Note 1:
Note 2:
Note 3:
Note 4:
All parameters tested at a single temperature. Specifications are guaranteed by design.
Timing specifications guaranteed by design.
The serial interface resets when SCL is low for more than t
TIMEOUT
.
A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL's falling edge.
Maxim Integrated
3
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C.)
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6639 toc01
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6639 toc02
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6639 toc03
10
9
8
SUPPLY CURRENT (μA)
7
6
5
4
3
2
1
0
3.0
3.5
4.0
4.5
5.0
800
700
SUPPLY CURRENT (μA)
600
500
400
300
2
TEMPERATURE ERROR (°C)
1
0
-1
FAIRCHILD 2N3906
200
5.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
-2
0
25
50
75
100
125
TEMPERATURE (°C)
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6639 toc04
REMOTE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6639 toc05
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
1.5
TEMPERATURE ERROR (°C)
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED TO
V
CC
WITH NO BYPASS CAPACITOR
MAX6639 toc06
1.0
0.5
TEMPERATURE ERROR (°C)
0
-0.5
-1.0
-1.5
-2.0
0
25
50
75
100
2.0
1.5
TEMPERATURE ERROR (°C)
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED TO
V
CC
WITH NO BYPASS CAPACITOR
2.0
125
10
100
1k
FREQUENCY (Hz)
10k
100k
1
10
100
1k
10k
100k
TEMPERATURE (°C)
FREQUENCY (Hz)
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6639 toc07
REMOTE TEMPERATURE ERROR
vs. DIFFERENTIAL NOISE FREQUENCY
1.5
TEMPERATURE ERROR (°C)
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
V
IN
= AC-COUPLED TO DXP
V
IN
= 100mV
P-P
SQUARE WAVE
MAX6639 toc08
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
1.0
TEMPERATURE ERROR (°C)
0
-1.0
-2.0
-3.0
-4.0
-5.0
-6.0
0.1
1
10
100
MAX6639 toc09
2.0
1.5
TEMPERATURE ERROR (°C)
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
V
IN
= AC-COUPLED TO DXP AND DXN
V
IN
= 100mV
P-P
SQUARE WAVE
2.0
2.0
0.1
1
10
100
1k
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
DXP-DXN CAPACITANCE (nF)
4
Maxim Integrated
MAX6639/MAX6639F
2-Channel Temperature Monitor with Dual,
Automatic, PWM Fan-Speed Controller
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25°C.)
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
MAX6639 toc10
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
MAX6639 toc11
35
35
PWMOUT FREQUENCY (Hz)
33
PWMOUT FREQUENCY (Hz)
-40
-15
10
35
60
85
110
34
34
33
32
32
31
31
30
TEMPERATURE (°C)
30
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
Pin Description
PIN
TQFN-EP
1, 15
QSOP
3, 1
NAME
PWM2,
PWM1
TACH2,
TACH1
FUNCTION
Open-Drain Output to Power-Transistor Driving Fan. Connect to the gate of a MOSFET or base of a
bipolar transistor. PWM_ requires a pullup resistor. The pullup resistor can be connected to a
supply voltage as high as 13.5V, regardless of the MAX6639’s supply voltage.
Tachometer Inputs. Connect to the tachometer output of the fan. TACH_ requires a pullup resistor.
The pullup resistor can be connected to a supply voltage as high as 13.5V, regardless of the
MAX6639’s supply voltage.
Active-Low, Open-Drain Thermal Alarm Output. Typically used for clock throttling. Open circuit
when V
CC
= 0.
Active-Low, Open-Drain Overtemperature Output. Typically used for system shutdown or clock
throttling. Can be pulled up to 5.5V regardless of V
CC
. Open circuit when V
CC
= 0.
Power-Supply Input. 3.3V nominal. Bypass V
CC
to GND with a 0.1µF capacitor.
Ground. Connect to a clean ground reference.
Combined Current Source and A/D Positive Input for Remote Diode. Connect to anode of remote-
diode-connected temperature-sensing transistor. Do not leave unconnected; connect to DXN if no
remote diode is used. Place a 2200pF capacitor between DXP_ and DXN for noise filtering.
Remote Diode Current Sink Input. Connect Cathode of the Remote-Diode-Connected Transistor to DXN
Address Input. Sets device slave address. Connect to GND, V
CC
, or leave unconnected to give
three unique addresses. See Table 1.
Active-Low, Open-Drain SMBus Alert Output
SMBus Serial-Clock Input. Can be pulled up to 5.5V regardless of V
CC
. Open circuit when V
CC
=
SMBus Serial-Data Input/Output, Open Drain. Can be pulled up to 5.5V regardless of V
CC
. Open
circuit when V
CC
= 0.
Exposed Pad (TQFN package only). Internally connected to GND. Connect EP to a large PCB pad
for optimum performance and enhanced thermal dissipation. Not intended as an electrical
connection point.
5
2, 16
3
4
5
6
7
8, 10
9
11
12
13
14
4, 2
5
6
7
8
10
9, 12
11
13
14
16
15
FANFAIL
Active-Low, Open-Drain, Fan-Failure Output. Open circuit when V
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