adt7476a Analog Devices, Inc., adt7476a Datasheet - Page 57

• Manufacturer Part Number: adt7476a
• Description: Dbcool Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

Table 28. Register 0x42—Interrupt Status Register 2 (Power-On Default = 0x00)
Bit
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Table 29. Register 0x43—VID/GPIO Register (Power-On Default = 0x1F )
Bit
[4:0]
[5]
[6]
[7]
Table 30. Voltage Limit Registers
Register Address
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
1
2
Setting the Configuration Register 1 lock bit has no effect on these registers.
High limits: An interrupt is generated when a value exceeds its high limit (> comparison). Low limits: An interrupt is generated when a value is equal to or below its low
limit (≤ comparison).
Name
12 V/VC
OVT
FAN1
FAN2
FAN3
F4P
D1
D2
Name
VID[4:0]/
GPIO[4:0]
VID5
THLD
VIDSEL
R/W
Read-only
Read-only
Read-only
Read-only
Read-only
Read-only
Read/write
Read-only
Read-only
Read-only
R/W
Read/Write
Read/Write
Read/Write
Read/Write
Description
A 1 indicates that the 12 V high or low limit has been exceeded. This bit is cleared on a read of the status
register only if the error condition has subsided. If Pin 21 is configured as VID5, this bit is the VID change bit.
This bit is set when the levels on VID0 to VID5 are different than they were 11 μs previously. This pin can be
used to generate an SMBALERT whenever the VID code changes.
OVT = 1 indicates that one of the THERM overtemperature limits has been exceeded. This bit is cleared on a
read of the status register when the temperature drops below THERM − T
FAN1 = 1 indicates that Fan 1 has dropped below minimum speed or has stalled. This bit is not set when
the PWM1 output is off.
FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is not set when
the PWM2 output is off.
FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is not set when
the PWM3 output is off.
When Pin 14 is programmed as a TACH4 input, F4P = 1 indicates that Fan 4 has dropped below minimum
speed or has stalled. This bit is not set when the PWM3 output is off.
When Pin 14 is programmed as the GPIO6 output, writing to this bit determines the logic output of GPIO6.
When GPIO6 is programmed as an input, this bit reflects the value read by GPIO6.
If Pin 14 is configured as the THERM timer input for THERM monitoring, then this bit is set when the THERM
assertion time exceeds the limit programmed in the THERM timer limit register (0x7A).
D1 = 1 indicates either an open or short circuit on the Thermal Diode 1 inputs.
D2 = 1 indicates either an open or short circuit on the Thermal Diode 2 inputs.
1
Description
The VID[4:0] inputs from the CPU indicate the expected processor core voltage. On power-up, these bits
reflect the state of the VID pins, even if monitoring is not enabled. When Bit 4 of Configuration Register 5
(0x7C) = 1, these bits become general-purpose outputs. The state of these bits then reflects the state of
the appropriate GPIO pin.
Reads VID5 from the CPU when Bit 7 = 1. If Bit 7 = 0, the VID5 bit always reads back 0 (power-on default).
Selects the input switching threshold for the VID inputs.
THLD = 0 selects a threshold of 1 V (V
THLD = 1 lowers the switching threshold to 0.6 V (V
VIDSEL = 0 configures Pin 21 as the 12 V measurement input (default).
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
R/W
Rev. 0 | Page 57 of 72
Description
2.5 V low limit.
2.5 V high limit.
V
V
V
V
5 V low limit.
5 V high limit.
12 V low limit.
12 V high limit.
CCP
CCP
CC
CC
low limit.
high limit.
low limit.
high limit.
OL
< 0.8 V, V
2
IH
> 1.7 V).
OL
< 0.4 V, V
IH
> 0.8 V).
Power-On Default
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
HYST
.
ADT7476A