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ADT7490
Table 59. REGISTER 0 x3C ? PECI T RANGE /ENHANCED ACOUSTICS REGISTER (POWER-ON DEFAULT = 0xC0)
R/W
Bit No.
[2:0]
Mnemonic
ACOU
(Note 1)
R/W
Description
Assuming that PWMx is associated with the PECI channel, these bits define the maximum
rate of change of the PWMx output for PECI temperature-related changes. Instead of the fan
speed jumping instantaneously to its newly determined speed, it ramps gracefully at the rate
determined by these bits. This feature ultimately enhances the acoustics of the fan. The
smoothing times below are based on a refresh rate of the round robin cycle. The PECI data,
for 0% to 100%, must be multiplied each time by:
PECI Refresh Rate
Round Robin Cycle
where the PECI refresh rate is defined in Register 0x36 and the round robin cycle is typically
165 ms.
When Bit 7 of Configuration Register 6 (0x10) is 0
Bit Code
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
Time for 0% to 100%
37.5 sec
18.8 sec
12.5 sec
7.5 sec
4.7 sec
3.1 sec
1.6 sec
0.8 sec
When Bit 7 of Configuration Register 6 (0x10) is 1
Bit Code
000 = 1
001 = 2
010 = 3
011 = 4
100 = 8
101 = 12
110 = 24
111 = 48
Time for 0% to 100%
52.2 sec
26.1 sec
17.4 sec
10.4 sec
6.5 sec
4.4 sec
2.2 sec
1.1 sec
[3]
[7:4]
ENP
RANGE
R/W
R/W
When this bit is set to 1, smoothing is enabled on the PECI channel allowing enhanced
acoustics on the associated PWM output.
These bits determine the PWM duty cycle vs. the temperature range for automatic fan
control.
Bit Code Temperature
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
2 ? C
2.5 ? C
3.33 ? C
4 ? C
5 ? C
6.67 ? C
8 ? C
10 ? C
13.33 ? C
16 ? C
20 ? C
26.67 ? C
32 ? C (Default)
40 ? C
53.33 ? C
80 ? C
1. This register becomes read-only when the Configuration Register 1 (0x40) Lock bit is set to 1. Any subsequent attempts to write to this
register fail.
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