ADM1027ARQZ-RL71 ONSEMI [ON Semiconductor], ADM1027ARQZ-RL71 Datasheet - Page 52

• Manufacturer Part Number: ADM1027ARQZ-RL71
• Manufacturer: ONSEMI [ON Semiconductor]

ADM1027
Bit
0
1
2
3
4
5
6
7
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.
Name
AIN1
AIN2
AIN3
AIN4
AVG
ATTN
CONV
`
Reserved
Table XXVIII. Register 0x73 – Configuration Register 2 (Power-On Default = 0x00)
R/W
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Description
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.
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.
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.
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.
AVG = 1, averaging on the temperature and voltage measurements is turned off. This
allows measurements on each channel to be made much faster.
ATTN = 1, the ADM1027 removes the attenuators from the 2.5 V, V
12 V inputs. The inputs can be used for other functions such as connecting up external
sensors.
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).
Reserved for future use
Rev. 3 | Page 52 of 56 | www.onsemi.com
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Bits <7:5> Reg. 0x55
000
001
010
011
100
101
110
111
Channel Selected
2.5 V
V
V
5 V
12 V
Remote 1 Temp
Local Temp
Remote 2 Temp
CCP
CC
(3.3 V)
CCP
, 5 V, and
REV. A