RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
Table 3.2 Electrical Specifications (continued)
VDD_3V = 3V to 3.6V, VDD_5V = 4.6V - 5.5V, TA = 0°C to 85°C
all Typical values at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
RPM Based Fan Controller
TACH Range
TACH
ΔTACH
ΔTACH
480
16000
±2
RPM
%
TACH Setting
Accuracy
±1
±5
External oscillator 32.768kHz
±7.5
%
Internal Oscillator
40°C < TDIE < 100°C
Thermal Shutdown
150
Thermal Shutdown
Threshold
TSDTH
°C
°C
Thermal Shutdown
Hysteresis
TSDHYST
50
SMBus and Digital I/O pins
Output High Voltage
Output Low Voltage
VOH
VDD
_3V 0.4
V
V
2 mA current drive
4mA current sink
VOL
0.5
Note 3.4 TDIE refers to the internal die temperature and may not match TA due to self heating of
the device. The internal temperature sensor will return TDIE
.
Note 3.5 Contact SMSC for Application Notes and guidelines when measuring GPU processor
diodes and CPU processor diodes.
3.3
SMBus Electrical Specifications
Table 3.3 SMBus Electrical Specifications
VDD_3V = 3V to 3.6V, VDD_5V = 4.6 to 5.5V, TA = 0°C to 85°C
Typical values are at TA = 27°C unless otherwise noted.
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNITS
CONDITIONS
SMBus Interface
Input High Voltage
VIH
VIL
2.0
-1
V
V
Input Low Voltage
0.8
Input High/Low Current
Input Capacitance
IIH / IIL
CIN
1
uA
pF
mA
5
Output Low Sink Current
4
SMDATA = 0.5V
SMBus Timing
Clock Frequency
fSMB
tSP
10
400
50
kHz
ns
Spike Suppression
SMSC EMC2102
Revision 1.95 (10-19-06)
DATA1S3HEET
SMSC [ SMSC CORPORATION ]
