ADT7468 Analog Devices, Inc., ADT7468 Datasheet - Page 69

• Manufacturer Part Number: ADT7468
• 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 Register (Power-On Default = 0x00)
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
12V/VC
OVT
FAN1
FAN2
FAN3
F4P
D1
D2
Name
VID[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
Read-only
Read-only
Read/write
Read/write
R/W
Description
A one 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 PWM 1 output is off.
FAN2 = 1 indicates that Fan 2 has dropped below minimum speed or has stalled. This bit is not set when
the PWM 2 output is off.
FAN3 = 1 indicates that Fan 3 has dropped below minimum speed or has stalled. This bit is not set when
the PWM 3 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 a GPIO output, writing to this bit determines the logic output of the GPIO.
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 limit register (Reg. 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.
R/W
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
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.
Reads VID5 from the CPU when Bit 7 = 1. If Bit 7 = 0, then 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).
1
Description
2.5 V
2.5 V
V
V
V
V
5 V low limit
5 V high limit
12 V low limit
12 V high limit
CCP
CCP
CC
CC
Rev. A | Page 69 of 84
low limit
high limit
low limit
high limit
OL
2
< 0.8 V, V
IH
> 1.7 V).
OL
< 0.4 V, V
Power-On Default
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
IH
> 0.8 V).
HYST
.
ADT7468