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ADT7476
Table 87. REGISTER 0X7D ? CONFIGURATION REGISTER 4 (POWER-ON DEFAULT = 0X00) (Note 1)
Bit No.
[1:0]
[2]
Mnemonic
PIN14FUNC
THERM
Disable
R/W
R/W
R/W
Description
These bits set the functionality of Pin 14.
00 = TACH4 (Default)
01 = THERM
10 = SMBALERT
11 = GPIO
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:
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.
[3]
MaxSpeed
THERM
R/W
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.
[4]
[5]
[6]
[7]
BpAtt 2.5 V
BpAtt V CCP
BpAtt 5.0 V
BpAtt 12 V
R/W
R/W
R/W
R/W
Bypass 2.5 V attenuator. When set, the measurement scale for this channel changes from
0 V (0x00) to 2.25 V (0xFF).
Bypass V CCP attenuator. When set, the measurement scale for this channel changes from
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).
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 88. REGISTER 0X7E ? MANUFACTURER’S TEST REGISTER 1 (POWER-ON DEFAULT = 0X00)
Bit No.
[7:0]
Mnemonic
Reserved
R/W
Read-only
Description
Manufacturer’s test register. These bits are reserved for manufacturer ’s test purposes and
should not be written to under normal operation.
Table 89. REGISTER 0X7F ? MANUFACTURER’S TEST REGISTER 2 (POWER-ON DEFAULT = 0X00)
Bit No.
[7:0]
Mnemonic
Reserved
R/W
Read-only
Description
Manufacturer’s test register. These bits are reserved for manufacturer ’s test purposes and
should not be written to under normal operation.
Table 90. ORDERING INFORMATION
Device Order Number*
ADT7476ARQZ ? REEL
Package Type
24-lead QSOP
Package Option
RQ ? 24
Shipping ?
2,500 Tape & Reel
?For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*The “Z” suffix indicates Pb-Free packages.
http://onsemi.com
64
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