ADT7490
Table 95. REGISTER 0 x7B ? TACH PULSES PER REVOLUTION REGISTER (POWER-ON DEFAULT = 0x55)
Bit No.
[1:0]
[3:2]
[5:4]
[7:6]
Mnemonic
FAN1
FAN2
FAN3
FAN4
R/W
R/W
R/W
R/W
R/W
Description
Sets number of pulses to be counted when measuring Fan 1 speed. Can be used to
determine fan pulses per revolution for unknown fan type.
Bit Code
Pulses Counted
00
1
01
2 (Default)
10
3
11
4
Sets number of pulses to be counted when measuring Fan 2 speed. Can be used to
determine fan pulses per revolution for unknown fan type.
Bit Code
Pulses Counted
00
1
01
2 (Default)
10
3
11
4
Sets number of pulses to be counted when measuring Fan 3 speed. Can be used to
determine fan pulses per revolution for unknown fan type.
Bit Code
Pulses Counted
00
1
01
2 (Default)
10
3
11
4
Sets number of pulses to be counted when measuring Fan 4 speed. Can be used to
determine fan pulses per revolution for unknown fan type.
Bit Code
Pulses Counted
00
1
01
2 (Default)
10
3
11
4
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