LM96000CIMT National Semiconductor, LM96000CIMT Datasheet - Page 23

• Manufacturer Part Number: LM96000CIMT
• Description: IC,Data Acquisition System,7-CHANNEL,8-BIT,TSSOP,24PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LM96000CIMT

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Register
Address
67h
68h
69h
Functional Description
4.18 Registers 67-69h: Temperature Limit
These are the temperature limits for the individual zones. When the current temperature equals this limit, the fan will be turned
on if it is not already. When the temperature exceeds this limit, the fan speed will be increased according to the algorithm set forth
in the Auto Fan Range, PWM Frequency register description. Default = 90˚C = 5Ah
This register becomes Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to write to this
register shall have no effect. After power up the default value is used whenever the Ready/Lock/Start/Override register Start bit
is cleared even though modifications to this register are possible.
PWM Duty Cycle
PWM Duty Cycle
Level (%)
Level (%)
100.00
14.29
21.43
28.57
35.71
42.86
50.00
57.14
64.29
71.43
78.57
85.71
92.86
15.38
23.08
30.77
38.46
7.14
7.69
0
0
Read/
Write
R/W
R/W
R/W
25.7KHz PWM Frequency
27.7KHz PWM Frequency
Register
Name
Zone1 Fan Temp Limit
Zone2 Fan Temp Limit
Zone3 Fan Temp Limit
Value in Decimal
Value in Decimal
110 - 127
128 - 145
146 - 164
165 - 182
183 - 200
201 - 218
219 - 237
238 - 255
18 - 36
37 - 54
55 - 72
73 - 90
91 - 109
20 - 38
39 - 58
59 - 78
79 - 97
1 - 17
1 - 19
0
0
Temperature
TABLE 10. Temperature Limit vs Register Setting
−127˚C
−50˚C
(Continued)
.
.
.
.
.
.
Value in Hex
Value in Hex
DB - ED
EE - FF
C9 - DA
Bit 7
(MSB)
7
7
7
5B - 6D
6E - 7F
A5 - B6
B7 - C8
3B - 4E
01 - 11
12 - 24
25 - 36
37 - 48
49 - 5A
80 - 91
92 - A4
01 - 13
14 - 26
27 - 3A
4F - 61
0
0
Reading (Decimal)
Bit 6
6
6
6
−127
−50
.
.
.
.
.
.
Bit 5
5
5
5
23
PWM Duty Cycle
PWM Duty Cycle
Bit 4
4
4
4
Level (%)
Level (%)
100.00
100.00
46.15
53.85
61.54
69.23
76.92
84.62
92.31
16.67
25.00
33.33
41.67
50.00
58.33
66.67
75.00
83.33
91.67
8.33
Reading (Hex)
0
Bit 3
3
3
3
CEh
81h
.
.
.
.
.
.
27.7KHz PWM Frequency
30KHz PWM Frequency
Bit 2
2
2
2
Value in Decimal
Value in Decimal
118 - 137
138 - 157
158 - 176
177 - 196
197 - 216
217 - 235
236 - 255
107 - 127
128 - 148
149 - 170
171 - 191
192 - 212
213 - 234
235 - 255
98 - 117
21 - 42
43 - 63
64 - 84
85 - 106
1 - 20
Bit 1
1
1
1
0
Bit 0
(LSB)
0
0
0
Value in Hex
Value in Hex
Default
Value
5Ah
5Ah
5Ah
EC - FF
AB - BF
EB - FF
C5 - D8
D9 - EB
C0 - D4
D5 - EA
8A - 9D
9E - B0
B1 - C4
2B - 3F
6B - 7F
62 - 75
76 - 89
01 - 14
15 - 2A
40 - 54
55 - 6A
80 - 94
95 - AA
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0
Lock?
U
U
U