Temperature Monitors and
PWM Fan Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
All Voltages Are Referenced to GND
TACH/AIN..............................................................-0.3V to +5.5V
V
CC
...........................................................................-0.3V to +6V
DXP, ADD, CRIT0, CRIT1........................-0.3V to + (V
CC
+ 0.3V)
DXN .......................................................................-0.3V to +0.8V
SMBDATA, SMBCLK, INT, THERM,
FAN_FAULT, SDL, SDR............................................-0.3V to +6V
SMBDATA, INT, THERM, FAN_FAULT,
PWM_OUT Current..............................................-1mA to +50mA
DXN Current .......................................................................?mA
ESD Protection (all pins, Human Body Model) ..................2000V
Continuous Power Dissipation (T
A
= +70癈)
16-Pin QSOP (derate 8.3 mW/癈 above +70癈)..........667mW
Operating Temperature Range .........................-40癈 to +125癈
Junction Temperature......................................................+150癈
Storage Temperature Range.............................-65癈 to +165癈
Lead Temperature (soldering, 10s).................................+300癈
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= 0癈 to +125癈, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25癈.) (Note1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Operating Supply Voltage Range
V
CC
3.0
5.5
V
Standby Current
SMBDAT = SMBCLK = 1, register 00h = 00h
10
礎
Operating Current
I
S
SMBDAT = SMBCLK = 1
0.5
1
mA
Average Operating Current
Conversion rate = 4Hz (default)
150
300
礎
V
C C
= +
3.3V , T
A
=
0?C to +
100?C ,
+ 60癈 d T
R
d + 100?C
?
V
CC
= +3.3V, 0?C d T
R
d +100?C
?
External Temperature Error
V
CC
= +3.3V, -25?C d T
R
d +125?C
?
?C
V
CC
= +3.3V, 0?C d T
A
d +100?C
?
Internal Temperature Error
V
CC
= +3.3V, -40?C d T
A
d +125?C
?
?C
0.125
?C
Temperature Resolution
(Internal and External)
11
Bits
Fan TACHOMETER Accuracy
(Note 2)
6
%
Fan TACHOMETER Full-Scale
Count
255
Divisor = 1, fan count = 153
4400
Divisor = 2, fan count = 153
2200
Divisor = 4, fan count = 153
1100
TACHOMETER Nominal Input
RPM
Divisor = 8, fan count = 153
550
RPM
Internal Clock Frequency
254
270
286
kHz
TACHOMETER Conversion Cycle
Time
637
ms
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