LM96000EVAL/NOPB National Semiconductor, LM96000EVAL/NOPB Datasheet - Page 25

• Manufacturer Part Number: LM96000EVAL/NOPB
• Description: BOARD EVALUATION LM96000
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM96000EVAL/NOPB

• Sensor Type: Temperature, Fan Controller
• Sensing Range: 0°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1°C
• Voltage - Supply: 3 V ~ 3.6 V
• Embedded: No
• Utilized Ic / Part: LM96000
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM96000EVAL

Register
Address
64h
65h
66h
4.17 Registers 64-66h: Minimum PWM Duty Cycle
These registers specify the minimum duty cycle that the PWM will output when the measured temperature reaches the Temperature
LIMIT register setting.
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 vs Register Setting for PWM High Frequency Range
PWM Duty Cycle
Level (%)
100.00
12.50
18.75
25.00
31.25
37.50
43.75
50.00
56.25
62.50
68.75
75.00
81.25
87.50
93.75
0.00
6.25
Read/
Write
R/W
R/W
R/W
22.5KHz PWM Frequency
Register
Name
Fan1 PWM Minimum
Fan2 PWM Minimum
Fan3 PWM Minimum
Value in Decimal
112 - 127
128 - 143
144 - 159
160 - 175
176 - 191
192 - 207
208 - 223
224 - 239
240 - 255
TABLE 9. PWM Duty vs Register Setting for PWM Low Frequency Range
16 - 31
32 - 47
48 - 63
64 - 79
80 - 95
96 - 111
1 - 15
0
Current Duty
0.3922%
25.098%
50.196%
100%
0%
Value in Hex
.
.
.
.
.
.
.
.
.
A0 - AF
B0 - BF
C0 - CF
D0 - DF
E0 - EF
F0 - FF
01 - 0F
10 - 1F
20 - 2F
30 - 3F
40 - 4F
50 - 5F
60 - 6F
70 - 7F
80 - 8F
90 - 9F
Bit 7
(MSB)
7
7
7
0
Value (Decimal)
Bit 6
6
6
6
128
255
25
64
Bit 5
5
5
5
0
1
.
.
.
.
.
.
.
.
.
PWM Duty Cycle
Bit 4
4
4
4
Level (%)
100.00
13.33
20.00
26.67
33.33
40.00
46.67
53.33
60.00
66.67
73.33
80.00
86.67
93.33
6.67
0
Value (Hex)
Bit 3
3
3
3
00h
01h
40h
80h
FF
.
.
.
.
.
.
.
.
.
24KHz PWM Frequency
Bit 2
2
2
2
Value in Decimal
102 - 118
119 - 136
137 - 153
154 - 170
171 - 187
188 - 204
205 - 221
222 - 238
239 - 255
17 - 33
34 - 50
51 - 67
68 - 84
85 - 101
Bit 1
1
1
1
1 - 16
0
Bit 0
(LSB)
0
0
0
Default
Value
80h
80h
80h
Value in Hex
CD - DD
BC - CC
DE - EE
AB - BB
9A - AA
EF - FF
01 - 10
11 - 21
22 - 32
33 - 43
44 - 54
55 - 65
66 - 76
77 - 88
89 - 99
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0
Lock?
✓
✓
✓