ADT7476ARQZ ON Semiconductor, ADT7476ARQZ Datasheet - Page 65

• Manufacturer Part Number: ADT7476ARQZ
• Description: IC REMOTE THERMAL CTRLR 24QSOP
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of ADT7476ARQZ

• Function: Fan Control, Temp Monitor
• Topology: ADC, Comparator, Fan Speed Counter, 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 ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-QSOP
• Full Temp Accuracy: +/- 0.5 C
• Digital Output - Bus Interface: Serial (3-Wire, 4-Wire)
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. 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.
1. 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.
Table 51. Register 0x7C — Configuration Register 5 (Power−On Default = 0x01)
Table 52. Register 0x7D — Configuration Register 4 (Power−On Default = 0x00)
Bit No.
Bit No.
[1:0]
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[2]
[3]
[4]
[5]
[6]
[7]
PIN14FUNC
Temp Offset
R1 THERM
R2 THERM
BpAtt V
BpAtt 2.5 V
BpAtt 5.0 V
Mnemonic
Mnemonic
MaxSpeed
BpAtt 12 V
VID/GPIO
GPIO6D
GPIO6P
THERM
THERM
THERM
Disable
Local
2sC
CCP
R/W (Note 1)
R/W (Note 1)
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
2sC = 1 sets the temperature range to the twos complement temperature range.
2sC = 0 changes the temperature range to the Offset 64 temperature range. When this bit is
changed, the ADT7476 interprets all relevant temperature register values as defined by this bit.
TempOffset = 0 sets offset range to −63°C to +64°C with 0.5°C resolution.
TempOffset = 1 sets offset range to −63°C to +127°C with 1°C resolution. These settings
apply to Remote 1, Local, and Remote2 temperature offset registers (0x70, 0x71, and 0x72).
GPIO6 direction. When GPIO6 function is enabled, this determines whether GPIO6 is an
input (0) or an output (1).
GPIO6 polarity. When the GPIO6 function is enabled and is programmed as an output, this
bit determines whether the GPIO6 is active low (0) or high (1).
VID/GPIO = 0 enables VID functionality on Pin 5, Pin 6, Pin 7, Pin 8, and Pin 19.
VID/GPIO = 1 enables GPIO functionality on Pin 5, Pin 6, Pin 7, Pin 8, and Pin 19.
R1 THERM = 1 enables THERM temperature limit functionality for Remote 1 temperature
channel; that is, THERM is bidirectional.
R1 THERM = 0 indicates THERM is a timer input only. THERM can also be disabled on any
channel by:
Local THERM = 1 enables THERM temperature limit functionality for local temperature
channel; that is, THERM is bidirectional.
Local THERM = 0 indicates THERM is a timer input only. THERM can also be disabled on
any channel by:
R2 THERM = 1 enables THERM temperature limit functionality for Remote 2 temperature
channel; that is, THERM is bidirectional.
R2 THERM = 0 indicates THERM is a timer input only.THERM can also be disabled on any
channel by:
These bits set the functionality of Pin 14.
THERM Disable = 0 enables THERM overtemperature output assuming THERM is correctly
configured (Registers 0x78, 0x7C, and 0x7D).
THERM Disable = 1 disables THERM overtemperature output on all channels.
THERM can also be disabled on any channel by:
MaxSpeed on THERM = 0 indicates that fans go to full speed when THERM temperature
limit is exceeded.
MaxSpeed on THERM = 1 indicates that fans go to max speed (0x38, 0x39, 0x3A) when
THERM temperature limit is exceeded.
Bypass 2.5V attenuator. When set, the measurement scale for this channel changes from
0 V (0x00) to 2.25 V (0xFF).
Bypass V
0 V (0x00) to 2.25 V (0xFF).
Bypass 5.0 V attenuator. When set, the measurement scale for this channel changes from
0 V (0x00) to 2.25 V (0xFF).
Bypass 12 V attenuator. When set, the measurement scale for this channel changes
from 0 V (0x00) to 2.25 V (0xFF).
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
Writing −64°C to the appropriate THERM temperature limit in Offset 64 mode.
Writing −128°C to the appropriate THERM temperature limit in twos complement mode.
00 = TACH4 (default)
01 = THERM
10 = SMBALERT
11 = GPIO
CCP
attenuator. When set, the measurement scale for this channel changes from
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Description
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