Analog Devices ADT7473 Manual page 72

ADT7473
Table 52. Register 0x7C—Configuration Register 5 (Power-On Default = 0x00)
1
Bit Name R/W
<0> 2sC Read/write
<1> TempOffset
<2> GPIOD
<3> GPIOP
<4> RES
<5> R1 THERM Read/write
<6> Local Read/write
THERM
<7> R2 THERM Read/write
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 53. Register 0x7D—Configuration Register 4 (Power-On Default = 0x00)
1
Bit Name R/W
<1:0> Pin9FUNC Read/write
<2> THERM Read/write
Disable
<3> Max/Full Read/write
on THERM
<4:5> RES
<6> BpAttVCCP Read/write
<7> RES
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.
Description
2sC = 1, sets the temperature range to twos complement temperature range.
2sC = 0, changes the temperature range to Offset 64. When this bit is changed, the ADT7473
interprets all relevant temperature register values as defined by this bit.
TempOffset = 0 Sets offset range to ±64°C at 0.5°C resolution.
TempOffset = 1 Sets offset range to ±128°C at 1°C resolution.
GPIO direction. When GPIO function is enabled, this determines whether the GPIO is an input (0) or an
output (1).
GPIO polarity. When the GPIO function is enabled and is programmed as an output, this bit
determines whether the GPIO is active low (0) or high (1).
Reserved
R1 THERM = 1, THERM temperature limit functionality enabled for Remote 1 temperature channel;
that is, THERM is bidirectional. R1 THERM = 0, THERM is a timer input only.
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.
Local THERM = 1, THERM temperature limit functionality enabled for the 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
•
Writing −64˚C to the appropriate THERM temperature limit in Offset 64 mode.
•
Writing −128˚C to the appropriate THERM temperature limit in two complement mode.
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
•
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.
Description
These bits set the functionality of Pin 9:
00 = TACH4 (default)
01 = THERM
10 = SMBALERT
11 = GPIO
THERM Disable = 1, disables THERM over temperature feature.
Max/Full on THERM = 0; when THERM temperature limit is exceeded, fans go to full speed.
Max/Full on THERM = 1; when THERM temperature limit is exceeded, fans go to max programmed fan
speed.
Max/Full on THERM = 1; when THERM limit is exceeded, fans go to max speed as defined in registers
0x38, 0x39, 0x3A.
Unused.
Bypass VCCP attenuator. When set, the measurement scale for this channel changes from 0 V (0x00) to
2.2965 V (0xFF).
Unused.
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