Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown
Datasheet
APPLICATION NOTE: The TRIP_SET / VIN4 pin circuitry is designed to use a 1% resistor externally. Using a 1%
resistor will result in the Thermal / Critical Shutdown temperature being decoded correctly. If
a 5% resistor is used, then the Thermal / Critical Shutdown temperature may be decoded
with as much as ±1°C error.
VTRIP is the TRIP_SET
voltage
T
TRIP – TMIN
----------------------------------
VTRIP
=
[1]
TMIN is the minimum
temperature based on the
range
80
Table 5.2 TRIP_SET Resistor Setting
TTRIP (°C)
TTRIP (°C)
LOW RANGE
TTRIP (°C)
HIGH RANGE
TTRIP (°C)
RSET (1%)
LOW RANGE
HIGH RANGE
RSET (1%)
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
92
93
0.0
28.7
48.7
69.8
90.9
113
137
158
182
210
237
261
294
324
348
383
412
453
487
523
562
604
649
92
93
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
1240
1330
1400
1500
1580
1690
1820
1960
2050
2210
2370
2550
2740
2940
3160
3480
3740
4120
4530
4990
5490
6040
6810
94
94
95
95
96
96
97
97
98
98
99
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
Revision 1.74 (05-08-08)
SMSC EMC2104
DATA2S4HEET
SMSC [ SMSC CORPORATION ]
