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LM93 Datasheet(PDF) 38 Page - Texas Instruments

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Part # LM93
Description  Hardware Monitor with Integrated Fan Control for Server Management
PDF  95 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM93 Datasheet(HTML) 38 Page - Texas Instruments

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LM93
SNAS210E – DECEMBER 2003 – REVISED MARCH 2013
www.ti.com
SPACER
4-Bit Value
Step
22.5 kHz (High Frequency)
Duty Cycle
0h
0.00%
1h
1
25.00%
2h
2
31.25%
3h
3
37.50%
4h
4
43.75%
5h
5
50.00%
6h
6
56.25%
7h
7
62.50%
8h
8
68.75%
9h
9
75.00%
Ah
10
81.25%
Bh
11
87.50%
Ch
12
93.75%
Dh
13
100.00%
Eh
—
Reserved
Fh
—
Reserved
3.16.10.5 Alternate PWM Frequencies
The PWM output can operate at lower frequencies, instead of the default 22.5 kHz. The alternate lower
frequencies can be enabled through the PWMx Control 4 registers. When operating in the lower frequency
mode, the mapping between step numbers and duty cycles changes. This effects the auto fan control and
all LM93 registers that describe a duty cycle using a 4-bit value.
The low frequency PWM output duty cycle mapping is listed in the following table:
SPACER
4-Bit Value
Step
Low Frequencies
Duty Cycle
0h
0%
1h
1
25.00%
2h
2
28.57%
3h
3
32.14%
4h
4
35.71%
5h
5
39.29%
6h
6
42.86%
7h
7
46.43%
8h
8
50.00%
9h
9
53.57%
Ah
10
57.14%
Bh
11
71.43%
Ch
12
85.71%
Dh
13
100.00%
Eh
—
Reserved
Fh
—
Reserved
38
Functional Description
Copyright © 2003–2013, Texas Instruments Incorporated
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Product Folder Links: LM93



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