ADT7476ARQH ONSEMI [ON Semiconductor], ADT7476ARQH Datasheet - Page 61

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ADT7476ARQH

Manufacturer Part Number
ADT7476ARQH
Description
dBCOOL Remote Thermal Controller and Voltage Monitor
Manufacturer
ONSEMI [ON Semiconductor]
Datasheet
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 42. Register 0x73 — Configuration Register 2 (Power−On Default = 0x00)
Table 43. Register 0x74 — Interrupt Mask Register 1 (Power−On Default [7:0] = 0x00)
Bit No.
Bit No.
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
0
1
2
3
4
5
6
7
FanPresDT
Fan1Detect
Fan2Detect
Fan3Detect
Mnemonic
Mnemonic
THERM
CONV
2.5 V/
ATTN
V
5.0 V
OOL
AVG
V
R1T
R2T
Res
LT
CCP
CC
R/W (Note 1)
Read−only
Read−only
Read−only
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bits [7:5], Register 0x55
000
001
010
011
100
101
110
111
When FanPresenceDT = 1, the state of Bits [3:1] of 0x73 reflects the presence of a 4−wire
fan on the appropriate TACH channel.
Fan1Detect = 1 indicates that a 4−wire fan is connected to the TACH1 input.
Fan2Detect = 1 indicates that a 4−wire fan is connected to the TACH2 input.
Fan3Detect = 1 indicates that a 4−wire fan is connected to the TACH3 input.
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).
ATTN = 1 indicates that the ADT7476 removes the attenuators from the +2.5 V
+5.0 V
up external sensors. It is also possible to remove attenuators from individual channels using
Bits [7:4] of Configuration Register 4 (0x7D).
CONV = 1 indicates that the ADT7476 is put into a single−channel ADC conversion mode. In
this mode, the ADT7476 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).
This bit is reserved and should not be changed.
2.5 V/THERM = 1 masks SMBALERT for out−of−limit conditions on the 2.5 V/THERM timer
channel.
V
V
5.0 V = 1 masks SMBALERT for out−of−limit conditions on the 5.0 V channel.
R1T = 1 masks SMBALERT for out−of−limit conditions on the Remote 1 temperature channel.
LT = 1 masks SMBALERT for out−of−limit conditions on the local temperature channel.
R2T = 1 masks SMBALERT for out−of−limit conditions on the Remote 2 temperature channel.
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.
CCP
CC
= 1 masks SMBALERT for out−of−limit conditions on the V
= 1 masks SMBALERT for out−of−limit conditions on the V
IN
, and +12 V
http://onsemi.com
IN
inputs. These inputs can be used for other functions such as connecting
61
Description
Description
2.5 V
V
V
5.0 V
12 V
Remote 1 temperature
Local temperature
Remote 2 temperature
CCP
CC
(3.3 V)
(Note 1)
CC
CCP
channel.
channel.
IN
, V
CCP
,

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