REV. A
54
ADM1027
Table XXXIII. Register 0x78 Configuration Register 3 (Power-On Default = 0x00)
Bit
Name
R/W
Description
<0>
ALERT
Read/Write
ALERT = 1, Pin 10 (PWM2/SMBALERT) is configured as an SMBALERT interrupt
output to indicate out-of-limit error conditions. Default = 0 = PWM2.
<1>
Reserved
Read/Write
Reserved for future use.
<2>
Reserved
Read/Write
Reserved for future use.
<3>
FAST
Read/Write
FAST = 1 enables fast TACH measurements on all channels. This increases the
TACH measurement rate from once per second, to once per 250 ms (4).
<4>
DC1
Read/Write
DC1 = 1 enables TACH measurements to be continuously made on TACH1.
<5>
DC2
Read/Write
DC2 = 2 enables TACH measurements to be continuously made on TACH2.
<6>
DC3
Read/Write
DC3 = 1 enables TACH measurements to be continuously made on TACH3.
<7>
DC4
Read/Write
DC4 = 1 enables TACH measurements to be continuously made on TACH4.
This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register
will have no effect.
Table XXXIV. Register 0x7B Fan Pulses Per Revolution Register (Power On Default = 0x55)
Bit
Name
R/W
Description
<1:0>
FAN1
Read/Write
Sets number of pulses to be counted when measuring FAN1 speed. Can be used to
determine fans pulses per revolution number for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<3:2>
FAN2
Read/Write
Sets number of pulses to be counted when measuring FAN2 speed. Can be used to
determine fans pulses per revolution number for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<5:4>
FAN3
Read/Write
Sets number of pulses to be counted when measuring FAN3 speed. Can be used to
determine fans pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
<7:6>
FAN4
Read/Write
Sets number of pulses to be counted when measuring FAN4 speed. Can be used to
determine fans pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
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