Analog Devices dBCool ADT7476 Manual page 71

Bit Name R/W
[6] Local R/W
THERM
Output only
[7] R2 THERM R/W
Output only
1
This register becomes read-only when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
Table 59. Register 0x7D—Configuration Register 4 (Power-On Default = 0x00)
1
Bit Name R/W
[1:0] Pin14Func R/W
[2] R/W
THERM
Disable
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[3] Max/Speed R/W
on THERM
[4] BpAtt 2.5V R/W
[5] BpAtt V R/W
CCP
[6] BpAtt 5V R/W
[7] BpAtt 12V R/W
1
This register becomes read-only when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
Table 60. Register 0x7E—Manufacturer's Test Register 1 (Power-On Default = 0x00)
Bit Name R/W
[7:0] Reserved Read-only
Table 61. Register 0x7F—Manufacturer's Test Register 2 (Power-On Default = 0x00)
Bit Name R/W
[7:0] Reserved Read-only
1
Description
Local THERM = 1 , THERM temperature limit functionality enabled for local temperature channel; that
is, THERM is bidirectional. Local THERM = 0, THERM is a timer input only.
THERM can also be disabled on any channel by:
In Offset 64 mode, writing −64°C to the appropriate THERM temperature limit.
In twos complement mode, writing −128°C to the appropriate THERM temperature limit.
R2 THERM = 1 , THERM temperature limit functionality enabled for Remote 2 temperature channel,
that is, THERM is bidirectional. R2 THERM = 0, THERM is a timer input only.
THERM can also be disabled on any channel by:
In Offset 64 mode, writing −64°C to the appropriate THERM temperature limit.
In twos complement mode, writing −128°C to the appropriate THERM temperature limit.
Description
These bits set the functionality of Pin 14.
00 = TACH4 (default)
01 = THERM
10 = SMBALERT
11 = GPIO6
THERM Disable = 0, THERM overtemperature output is enabled assuming THERM is correctly
configured (Registers 0x78, 0x7C, 0x7D).
THERM Disable = 1, THERM overtemperature output is disabled on all channels.
THERM can also be disabled on any channel by:
In Offset 64 mode, writing −64°C to the appropriate THERM temperature limit.
In twos complement mode, writing −128°C to the appropriate THERM temperature limit.
Max/Speed on THERM = 0, fans go to full speed when THERM temperature limit is exceeded.
Max/Speed on THERM = 1, fans go to maximum speed (Register 0x38, Register 0x39, and Register
0x3A) when THERM temperature limit is exceeded.
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 attenuator. When set, the measurement scale for this channel changes from 0 V (0x00) to
CCP
2.25 V (0xFF).
Bypass 5 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).
Description
Manufacturer's test register. These bits are reserved for manufacturer's test purposes and should not
be written to under normal operation.
Description
Manufacturer's test register. These bits are reserved for manufacturer's test purposes and should not
be written to under normal operation.
Rev. B | Page 71 of 72
ADT7476