ADM1034
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29
Table 36. REGISTER 0X00, # BYTES/BLOCK READ, POR = 0X20, LOCK = Y, S/W RESET = Y
Bit
Name
R/W
Description
<7:0>
# Bytes Block Read
R/W
Block reads are # bytes/block read long. The maximum is 32 bytes, the SMBus
transaction limit.
Table 37. REGISTER 0X01, CONFIGURATION REGISTER 1, POWER-ON DEFAULT 0X01, LOCK = Y, S/W RESET = Y
Bit
Name
R/W
Description
7
Table/SW Con
R/W
Set this bit to 1 to place the fan speed under the control of the look-up table. When this
bit is 0, the ADM1034 is in software/manual control mode. Default = 0.
6
Lock Bit
R/W
Set this bit to 1 to prevent the user from writing to the ADM1034 registers.
1 = ADM1034 registers locked. 0 = ADM1034 registers unlocked. Default = 0.
5
SDA Timeout
R/W
1 = SDA timeout enabled. 0 = SDA timeout disabled. Default = 0.
4
SCL Timeout
R/W
1 = SCL timeout enabled. 0 = SDL timeout disabled. Default = 0.
3
ALERT
Configuration
R/W
0 = SMBusALERT
. Default = 0. 1 = ALERT
_COMP mode.
2
Enable THERM
Timer
R/W
1 = timer enabled, 0 = timer disabled. This bit enables THERM
as an input. Default = 0.
1
Averaging Off
R/W
This bit is used to disable averaging at the slower conversion rates (8 Hz and slower).
Averaging is automatically disabled at the higher (16, 32, and 64 Hz ) conversion rates.
Default = averaging on = 0.
0
Monitor/STBY
R/W
Set bit to 1 to enable temperature monitoring. Set bit to 0 to disable it.
Power-On Default = 1.
Table 38. REGISTER 0X02, CONFIGURATION REGISTER 2, POWER-ON DEFAULT 0X84, LOCK = Y, S/W RESET = Y
Bit
Name
R/W
Description
7
Round Robin
R/W
This bit enables the round-robin mode. Set this bit to 0 to put the ADM1034 in
single-channel mode. The ADC converts on one channel only, which is determined by
the channel selector bits. Default = Round Robin = 1.
6
Reserved
R/W
Reserved
<5:4>
Channel Selector
R/W
This bit determines the channel on which the ADC converts.
00 = Local Channel Only
01 = Remote 1 Channel Only
10 = Remote 2 Channel Only
11 = Reserved
3
4:8 Look-up Table
R/W
This bit determines how many table points are used to control each fan.
0 = 4 table points for each fan.
1 = all 8 points on one table; this table is used to control both fans.
2
Discrete/Linear Speed
R/W
This bit determines whether the fans run at discrete speeds or at speeds that increase
with temperature between the two thresholds. Default = 1 = Linear.
1
Boost Disable
R/W
Set bit to 1 to prevent the fans from being boosted if either THERM
temperature or
THERM
timer limits are exceeded. Under these conditions, the fan runs at the
previously calculated speed. Default = 0.
0
SW Reset
R/W
Set this bit to 1 to reset the ADM1034 registers to their default values, excluding the limit
registers, offset registers, and look-up table registers. This bit self-clears. Default = 0.
Table 39. REGISTER 0X03, CONFIGURATION REGISTER 3, POWER-ON DEFAULT 0X44, LOCK = Y, S/W RESET = Y
Bit
Name
R/W
Description
<7:4>
#Poles Fan 2
R/W
Write the number of poles on Fan 2 to this register. power-on default = 4 poles = 100.
This should always be an even number, because there cannot be an odd number of
poles in a fan.
<3:0>
#Poles Fan 1 1
R/W
Write the number of poles in Fan 1 to this register. power-on default = 4 poles = 00.
This should always be an even number, because there cannot be an odd number of
poles in a fan.
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