ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 71

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

Table 47. Remote 2 Temperature Offset Register (0x72)
Bit
[7:0]
1
Table 48. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
1
Table 49. Register 0x74—Interrupt Mask Register 1 (Power-On Default = 0x00)
Bit
[1]
[2]
[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 have no effect.
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.
Name
V
V
R1T
LT
R2T
OOL
CCP
CC
Name
FanPresenceDT
Fan1 Detect
Fan2 Detect
Fan3 Detect
AVG
ATTN
CONV
SHDN
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
R/W
R/W
Read
Read
Read
R/W
R/W
R/W
R/W
1
Description
Allows a twos complement offset value to be automatically added to or
subtracted from the Remote 2 temperature reading. This is to compensate for
any inherent system offsets such as PCB trace resistance. LSB value = 0.5°C.
Description
V
V
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, then 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 are still asserted.
OOL = 1, then 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 are 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
Description
When FanPresenceDT = 1, the state of Bits [3:1] of Register 0x73 reflects the
presence of a 4-wire fan on the appropriate TACH channel.
Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM1 input.
Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM2 input.
Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM3 input.
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 ADT7473 removes the attenuators from the V
input can be used for other functions such as connecting up external sensors.
CONV = 1, the ADT7473 is put into a single-channel ADC conversion mode. In this
mode, the ADT7473 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
SHDN = 1, ADT7473 goes into shutdown mode. All PWM outputs assert low (or
high depending on the state of the INV bit) to switch off all fans. The PWM current
duty cycle registers read 0x00 to indicate the fans are not being driven.
Rev. A | Page 71 of 76
Reserved.
V
V
Reserved.
Reserved.
Remote 1 temperature.
Local temperature.
Remote 2 temperature.
CCP
CC
(3.3 V).
.
CC
CCP
channel.
channel.
CCP
Power-On Default
0x00
input. The V
ADT7473
CCP