ON Semiconductor ADT7476AARQZ-R Manual page 63

Table 77. REGISTER 0x73 − CONFIGURATION REGISTER 2 (POWER-ON DEFAULT = 0x00)
Bit No. Mnemonic
0 FanPresDT
1 Fan1Detect
2 Fan2Detect
3 Fan3Detect
4 AVG
5 ATTN
6 CONV
7 Res
1. This register becomes read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to this register have no effect.
Table 78. REGISTER 0x74 − INTERRUPT MASK REGISTER 1 (POWER-ON DEFAULT [7:0] = 0x00)
Bit No. Mnemonic
[0] 2.5 V/
THERM
[1] V
[2] V
[3] 5.0 V
[4] R1T
[5]
[6] R2T
[7] OOL
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R/W
R/W When FanPresenceDT = 1, the state of Bits [3:1] of 0x73 reflects the presence of a 4-wire fan
on the appropriate TACH channel.
Read-only Fan1Detect = 1 indicates that a 4-wire fan is connected to the TACH1 input.
Read-only Fan2Detect = 1 indicates that a 4-wire fan is connected to the TACH2 input.
Read-only Fan3Detect = 1 indicates that a 4-wire fan is connected to the TACH3 input.
R/W AVG = 1 indicates that averaging on the temperature and voltage measurements is turned
off. This allows measurements on each channel to be made much faster (x16).
R/W ATTN = 1 indicates that the ADT7476A removes the attenuators from the +2.5 V
+5.0 V
connecting up external sensors. It is also possible to remove attenuators from individual
channels using Bits [7:4] of Configuration Register 4 (0x7D).
R/W CONV = 1 indicates that the ADT7476A is put into a single-channel ADC conversion mode.
In this mode, the ADT7476A can be made to read continuously from one input only, for
example, Remote 1 temperature. The appropriate ADC channel is selected by writing to
Bits [7:5] of TACH1 minimum high byte register (0x55).
Bits [7:5], Register 0x55
000
001
010
011
100
101
110
111
This bit is reserved and should not be changed.
R/W
R/W 2.5 V/THERM = 1 masks SMBALERT for out-of-limit conditions on the 2.5 V/THERM timer
channel.
R/W V = 1 masks SMBALERT for out-of-limit conditions on the V
CCP CCP
R/W V = 1 masks SMBALERT for out-of-limit conditions on the V
CC CC
R/W 5.0 V = 1 masks SMBALERT for out-of-limit conditions on the 5.0 V channel.
R/W R1T = 1 masks SMBALERT for out-of-limit conditions on the Remote 1 temperature channel.
LT R/W LT = 1 masks SMBALERT for out-of-limit conditions on the local temperature channel.
R/W R2T = 1 masks SMBALERT for out-of-limit conditions on the Remote 2 temperature channel.
R/W OOL = 0 when one or more alerts are generated in Interrupt Status Register 2, assuming all
the mask bits in the Interrupt Mask Register 2 (0x75) = 1, SMBALERT is still asserted.
OOL = 1 when one or more alerts are generated in Interrupt Status Register 2, assuming all
the mask bits in the Interrupt Mask Register 2 (0x75) = 1, SMBALERT is not asserted.
ADT7476A
, and +12 V inputs. These inputs can be used for other functions such as
IN IN
2.5 V
V
CCP
V (3.3 V)
CC
5.0 V
12 V
Remote 1 Temperature
Local Temperature
Remote 2 Temperature
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63
(Note 1)
Description
Description
channel.
CCP
channel.
CC
, V ,
IN CCP