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
External Temperature Monitors
Temperature
Accuracy
±1
±1
1
±1.5
±3
°C
°C
°C
pF
60°C < TDIODE < 100°C
30°C < TDIE < 85°C (Note 3.4)
0°C < TDIODE < 125°C,
0°C < TDIE < 115°C (Note 3.4)
Temperature
Resolution
Diode decoupling
capacitor
CFILTER
2200
Connected across external
2N3904 diode or AMD diode
(Note 3.5)
470
100
pF
Connected across CPU or GPU
thermal diode (Note 3.5)
Resistance Error
Corrected
RSERIES
Ohm
Series resistance in DP and DN
lines
Internal Temperature Monitor
±3
Temperature
Accuracy
°C
°C
(Note 3.4 )
Temperature
Resolution
1
Reset Generator
Reset Voltage
VRESET
4.3
4.4
4.5
V
VDD_5V rising edge
3V < VDD_3V < 3.6V
Hysteresis
Time Delay
ΔVRESET
100
220
mV
ms
tRESET
High Side Fan Driver
Output High Voltage
from 5V supply
VOH_5V
VDD_5
V - 0.4
V
ISOURCE = 600mA, VDD_5V =
5V
Fan Drive Current
Overcurrent Limit
ISOURCE
IOVER
600
mA
mA
1500
Momentary Current drive at
startup for < 2 seconds
DC Short Circuit
Current Limit
ISHORT
800
mA
Sourcing current, Thermal
shutdown not triggered,
FAN_OUT = 0V
Short circuit delay
tDFS
2
s
Output Capacitive
Load
CLOAD
100
uF
ESR on CLOAD
RESR
0
2
Ohm
Revision 1.95 (10-19-06)
SMSC EMC2102
DATA1S2HEET
SMSC [ SMSC CORPORATION ]
