ADT7462ACPZ-REEL ON Semiconductor, ADT7462ACPZ-REEL Datasheet - Page 60

• Manufacturer Part Number: ADT7462ACPZ-REEL
• Description: IC TEMP/VOLT MONITOR 32-LFCSP
• Manufacturer: ON Semiconductor

Specifications of ADT7462ACPZ-REEL

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-LFCSP
• Number Of Voltages Monitored: 1
• Monitored Voltage: 0.9 V to 12 V
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 3 V
• Supply Current (typ): 4000 uA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. POR = 0x20, Lock = Y, SW Reset = Y.
1. POR = 0x81, Lock = Y, SW Reset = Y.
1. POR = 0x80, Lock = Y, SW Reset = Y.
Table 31. Register 0x00 — Configuration Register 0
Table 32. Register 0x01 — Configuration Register 1
Table 33. Register 0x02 — Configuration Register 2
[5:0]
[7:6]
Bit
Bit
Bit
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
Fans Full Speed
Setup Complete
#TACH Pulses
ALERT Mode
#Bytes Block
VID Decoder
Disable Fast
VRD1 Boost
VRD2 Boost
PWM Mode
SW Reset
Reserved
Reserved
Reserved
Spin−Up
Monitor
Name
Name
Name
FAST
Read
Lock
RDY
Write
Once
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
These bits set the number of registers to be read in a block read. Default = 0x20.
0 = VR10 Decoding Spec; 1 = VR11 Decoding Spec. Default = 0.
Setting this bit to 1 restores all unlocked registers to their default values. Self−clearing. Write
0x6D to register 0x7B before setting this bit to get a software reset. Default = 0.
Setting this bit to 1 enables temperature and voltage measurements. When this bit is set to 0,
temperature and voltage measurements are disabled. Default = 1.
Reserved. Default = 0.
Reserved. Default = 0.
This bit sets the ALERT mode in the ADT7462. 1 = comparator mode, 0 = SMBALERT mode
(default).
Setting this bit to 1 disables the fast spin−up (for two TACH pulses) for the fans. Instead, the
fans spin up for the programmed fan startup timeout. Default = 0.
Setting this bit to 1 tells the ADT7462 that setup is complete and that monitoring of all selected
channels should begin. Default = 0.
Logic 1 locks all limit values at their current settings. When this bit is set, all lockable registers
become read−only and cannot be modified until the ADT7462 is powered down and powered
up again. This prevents rogue programs, such as viruses, from modifying critical system limit
settings. Lockable.
This bit is set to 1 to indicate that the ADT7462 is fully powered up and ready to start
monitoring.
In low frequency, PWM fan speed measurements are made once a second. Setting this bit to 1
increases the frequency of the fan speed measurements to 4 times a second. Default = 0.
Reserved. Default = 0.
This bit sets the PWM frequency mode. 0 = low frequency PWM; frequency programmable
between 11 Hz and 88.2 Hz. Default = 35.3 Hz. 1 = high frequency mode, 22.5 kHz.
Setting this bit to 0 causes the fans to go to full speed on assertion of VRD1. Default = 0.
When this bit is set to 1, VRD1 assertions have no effect on the fan speed.
Setting this bit to 0 causes the fans to go to full speed on assertion of VRD2. Default = 0.
When this bit is set to 1, VRD2 assertions have no effect on the fan speed.
Setting this bit to 1 drives the fans to full speed. Default = 0.
In low frequency mode, the ADT7462 must pulse stretch to get an accurate fan speed
measurement. The speed is always measured between the 2nd rising edge and one × TACH
pulses later. This bit determines the last TACH pulse. Therefore, if the fan speed is to be
measured between the second and fourth TACH pulse, 01 is written to these bits.
x = 1 = 00
x = 2 = 01
x = 3 = 10 (default)
x = 4 = 11
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