Analog Devices dBCool ADT7476, Руководство пользователя

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ADT7476
Rev. B | Page 70 of 72
Table 57. Register 0x7B—TACH Pulses per Revolution Register (Power-On Default = 0x55)
Bit Name R/W Description
[1:0] FAN1 R/W Sets number of pulses to be counted when measuring Fan 1 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
[3:2] FAN2 R/W Sets number of pulses to be counted when measuring Fan 2 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
[5:4] FAN3 R/W Sets number of pulses to be counted when measuring Fan 3 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
[7:6] FAN4 R/W Sets number of pulses to be counted when measuring Fan 4 speed. Can be used to determine fan
pulses per revolution for unknown fan type.
Pulses Counted
00 = 1
01 = 2 (default)
10 = 3
11 = 4
Table 58. Register 0x7C—Configuration Register 5 (Power-On Default = 0x01)
Bit Name R/W
1
Description
[0] TWOS
COMPL R/W TWOS COMPL = 1, sets the temperature range to the twos complement temperature range.
TWOS COMPL = 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.
[1] Temp Offset R/W 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 registers 0x70, 0x71, and 0x72 (Remote 1, internal, and Remote 2 temperature
offset registers.
[2] GPIO6D R/W GPIO6 direction. When GPIO6 function is enabled, this determines whether GPIO6 is an input (0) or an
output (1).
[3] GPIO6P R/W 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).
[4] VID/GPIO R/W VID/GPIO = 0, VID functionality is enabled on Pin 5, Pin 6, Pin 7, Pin 8, and Pin 19.
VID/GPIO = 1, GPIO functionality is enabled on Pin 5, Pin 6, Pin 7, Pin 8, and Pin 19.
[5] R1 THERM
Output only R/W R1 THERM = 1 , THERM temperature limit functionality is 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:
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.
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