ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 72

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

ADT7473
Table 50. Register 0x75—Interrupt Mask Register 2 (Power-On Default <7:0> = 0x00)
Bit
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Table 51. Register 0x76—Extended Resolution 1
Bit
[3:2]
[5:4]
1
Table 52. Register 0x77—Extended Resolution Register 2
Bit
[3:2]
[5:4]
[7:6]
1
Table 53. Register 0x78—Configuration Register 3 (Power-On Default = 0x00)
Bit
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
1
If this register is read, this register and the registers holding the MSB of each reading are frozen until read.
If this register is read, this register and the registers holding the MSB of each reading are frozen until read.
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
ALERT
THERM
BOOST
FAST
DC1
DC2
DC3
DC4
Name
OVT
FAN1
FAN2
FAN3
F4P
D1
D2
Name
V
V
Name
TDM1
LTMP
TDM2
CCP
CC
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read only
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read-only
Read-only
R/W
Read-only
Read-only
Read-only
1
Description
ALERT = 1, Pin 5 (PWM2/SMBALERT) is configured as an SMBALERT interrupt output to indicate out-of-
limit error conditions.
THERM Enable = 1 enables THERM functionality on Pin 9. Also determined by Bit 0 and Bit 1 (PIN9FUNC) of
Configuration Register 4. Direction is controlled by Bit 5, Bit 6, and Bit 7 of Configuration Register 5 (0x7C).
When THERM is asserted, if the fans are running and the boost bit is set, the fans run at full speed. THERM
can also be programmed so that a timer monitors the duration THERM has been asserted.
When THERM is an input and BOOST = 1, assertion of THERM causes all fans to run at the maximum
programmed duty cycle for fail-safe cooling.
FAST = 1, enables fast TACH measurements on all channels. This increases the TACH measurement rate
from once per second to once every 250 ms (4 ×).
DC1 = 1, enables TACH measurements to be continuously made on TACH1. Fans must be driven by dc.
Setting this bit prevents pulse stretching, because it is not required for DC-driven motors.
DC2 = 1, enables TACH measurements to be continuously made on TACH2. Fans must be driven by dc.
Setting this bit prevents pulse stretching, because it is not required for DC-driven motors.
DC3 = 1, enables TACH measurements to be continuously made on TACH3. Fans must be driven by dc.
Setting this bit prevents pulse stretching, because it is not required for DC-driven motors.
DC4 = 1, enables TACH measurements to be continuously made on TACH4. Fans must be driven by dc.
Setting this bit prevents pulse stretching, because it is not required for DC-driven motors.
Description
OVT = 1, masks SMBALERT for overtemperature THERM conditions.
FAN1 = 1, masks SMBALERT for a Fan 1 fault.
FAN2 = 1, masks SMBALERT for a Fan 2 fault.
FAN3 = 1, masks SMBALERT for a Fan 3 fault.
F4P = 1, masks SMBALERT for a Fan 4 fault. If the TACH4 pin is being used as the THERM input, this
bit masks SMBALERT for a THERM timer event.
D1 = 1, masks SMBALERT for a diode open or short on a Remote 1 channel.
D2 = 1, masks SMBALERT for a diode open or short on a Remote 2 channel.
Description
V
V
Remote 1 temperature LSBs. Holds the 2 LSBs of the 10-bit Remote 1 temperature measurement.
Local temperature LSBs. Holds the 2 LSBs of the 10-bit local temperature measurement.
Remote 2 temperature LSBs. Holds the 2 LSBs of the 10-bit Remote 2 temperature measurement.
Description
CCP
CC
LSBs. Holds the 2 LSBs of the 10-bit V
LSBs. Holds the 2 LSBs of the 10-bit V
1
1
Rev. A | Page 72 of 76
CC
CCP
measurement.
measurement.