ADT7463ARQZ ON Semiconductor, ADT7463ARQZ Datasheet - Page 39

• Manufacturer Part Number: ADT7463ARQZ
• Description: IC REMOTE THERMAL CTRLR 24-QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7463ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Bit
<0>
<1>
<2>
<3>
<4>
<5>
<6>
<7>
Bit
<4:0>
<5>
<6>
<7>
Register Address
0x44
0x45
0x46
0x47
0x48
0x49
0x4A
0x4B
0x4C
0x4D
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).
REV. C
Name
12V/VC
OVT
FAN1
FAN2
FAN3
F4P
D1
D2
Name
VID[4:0]
VID5
THLD
VIDSEL
Table XIV. Register 0x42 – Interrupt Status Register 2 (Power-On Default = 0x00)
R/W
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only
R/W
Read-Only
Read-Only
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
R/W
Table XV. Register 0x43 – VID Register (Power-On Default = 0x00)
A one indicates that Fan 1 has dropped below minimum speed or has stalled.
A one indicates that Fan 2 has dropped below minimum speed or has stalled.
A one indicates that Fan 3 has dropped below minimum speed or has stalled.
A one indicates that Fan 4 has dropped below minimum speed or has stalled.
If Pin 14 or Pin 20 is configured as the THERM timer input for THERM
A one indicates either an open or short circuit on the Thermal Diode 1 inputs.
A one indicates either an open or short circuit on the Thermal Diode 2 inputs.
Description
A one indicates the 12 V high or low limit has been exceeded. This bit gets 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 gets set when the levels on VID0 to VID5 are different
than they were 11 µs previously. This can be used to generate an SMBALERT whenever
the VID code changes.
A one indicates that one of the THERM overtemperature limits has been exceeded. This
bit gets cleared on a read of the status register when the temperature drops below
THERM – T
This bit does NOT get set when the PWM 1 output is off.
This bit does NOT get set when the PWM 2 output is off.
This bit does NOT get set when the PWM 3 output is off.
This bit does NOT get set when the PWM 3 output is off.
monitoring, then this bit gets set when the THERM assertion time exceeds the
limit programmed in the THERM Limit Register (Reg. 0x7A).
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
The VID[4:0] inputs from the CPU to 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).
This selects the input switching threshold for the VID inputs. THLD = 0 selects a
threshold of 1 V (V
to 0.6 V (V
VIDSEL = 0 configures Pin 21 as the 12 V measurement input (default).
VIDSEL = 1 configures Pin 21 as the VID5 input. This also allows VID code
changes to be detected.
Description
CCP
CCP
CC
CC
Rev. 4 | Page 39 of 52 | www.onsemi.com
Table XVI. Voltage Limit Registers
Low Limit
High Limit
Low Limit
High Limit
OL
HYST
< 0.4 V, V
.
OL
–39–
< 0.8 V, V
IH
> 0.8 V).
IH
> 1.7 V). THLD = 1 lowers the switching threshold
Power-On Default
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
0x00
0xFF
ADT7463