ADT7476A
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Table 85. REGISTER 0x7B − TACH PULSES PER REVOLUTION REGISTER (POWER-ON DEFAULT = 0x55)
Bit No.
Mnemonic
R/W
Description
[1:0]
FAN1
R/W
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.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
[3:2]
FAN2
R/W
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.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
[5:4]
FAN3
R/W
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.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
[7:6]
FAN4
R/W
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.
Pulses Counted
00 = 1
01 = 2 (Default)
10 = 3
11 = 4
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