REV. A
52
ADM1027
Table XXVIII. Register 0x73 Configuration Register 2 (Power-On Default = 0x00)
Bit
Name
R/W
Description
0
AIN1
Read/Write
AIN1 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN1 = 1, Pin 11 is reconfigured to measure the speed of 2-wire fans using an external
sensing resistor and coupling capacitor.
1
AIN2
Read/Write
AIN2 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN2 = 1, Pin 12 is reconfigured to measure the speed of 2-wire fans using an external
sensing resistor and coupling capacitor.
2
AIN3
Read/Write
AIN3 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN3 = 1, Pin 9 is reconfigured to measure the speed of 2-wire fans using an external
sensing resistor and coupling capacitor.
3
AIN4
Read/Write
AIN4 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN4 = 1, Pin 14 is reconfigured to measure the speed of 2-wire fans using an external
sensing resistor and coupling capacitor.
4
AVG
Read/Write
AVG = 1, averaging on the temperature and voltage measurements is turned off. This
allows measurements on each channel to be made much faster.
5
ATTN
Read/Write
ATTN = 1, the ADM1027 removes the attenuators from the 2.5 V, V
CCP
, 5 V, and
12 V inputs. The inputs can be used for other functions such as connecting up external
sensors.
6
CONV
Read/Write
CONV = 1, the ADM1027 is put into a single-channel ADC conversion mode.
In this mode, the ADM1027 can be made to read continuously from one input only,
e.g., Remote 1 temperature. It is also possible to start ADC conversions using an
external clock on Pin 11 by setting Bit 2 of Test Register 2 (Reg. 0x7F). This mode
could be useful if, for example, the user wanted to characterize/profile CPU temperature
quickly. The appropriate ADC channel is selected by writing to Bits <7:5> of TACH1
minimum high byte register (0x55).
Bits <7:5> Reg. 0x55
Channel Selected
`
000
2.5 V
001
V
CCP
010
V
CC
(3.3 V)
011
5 V
100
12 V
101
Remote 1 Temp
110
Local Temp
111
Remote 2 Temp
7
Reserved
Read/Write
Reserved for future use
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.
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