ADT7467 Analog Devices, Inc., ADT7467 Datasheet - Page 72

• Manufacturer Part Number: ADT7467
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7467
Table 43. Local Temperature Offset
Register Address
0x71
<7:0>
1
Table 44. Remote 2 Temperature Offset
Register Address
0x72
<7:0>
1
Table 45. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit
0
1
2
3
4
5
6
7
1
This register becomes a read-only register when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 lock bit is set to 1. Any subsequent attempts to write to this register fail.
Name
AIN1
AIN2
AIN3
AIN4
AVG
ATTN
CONV
SHDN
R/W
Read/write
Read/write
R/W
Read/write
Read/write
R/W
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
Read/write
1
1
1
Description
AIN1 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN1 = 1, Pin 6 is reconfigured to measure the speed of 2-wire fans using an
external sensing resistor and coupling capacitor. AIN voltage threshold is set via
Configuration Register 4 (Reg. 0x7D). Only relevant in low frequency mode.
AIN2 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN2 = 1, Pin 7 is reconfigured to measure the speed of 2-wire fans using an
external sensing resistor and coupling capacitor. AIN voltage threshold is set via
Configuration Register 4 (Reg. 0x7D). Only relevant in low frequency mode.
AIN3 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN3 = 1, Pin 4 is reconfigured to measure the speed of 2-wire fans using an
external sensing resistor and coupling capacitor. AIN voltage threshold is set via
Configuration Register 4 (Reg. 0x7D). Only relevant in low frequency mode.
AIN4 = 0, speed of 3-wire fans measured using the TACH output from the fan.
AIN4 = 1, Pin 9 is reconfigured to measure the speed of 2-wire fans using an
external sensing resistor and coupling capacitor. AIN voltage threshold is set via
Configuration Register 4 (Reg. 0x7D). Only relevant in low frequency mode.
AVG = 1, averaging on the temperature and voltage measurements is turned off.
This allows measurements on each channel to be made much faster.
ATTN = 1, the ADT7467 removes the attenuators from the V
can be used for other functions such as connecting external sensors.
CONV = 1, the ADT7467 is put into a single-channel ADC conversion mode. In this
mode, the ADT7467 can be set to read continuously from one input only, for
example, Remote 1 temperature. The appropriate ADC channel is selected by
writing to bits <7:5> of TACH1 minimum high byte register (0x55).
Bits <7:5> Reg. 0x55
000
001
010
011
100
101
110
111
SHDN = 1, ADT7467 goes into shutdown mode. All PWM outputs assert low (or
high depending on the state of the INV bit) to switch off all fans. The PWM current
duty cycle registers read 0x00 to indicate that the fans are not being driven.
Description
Local temperature offset.
Allows a twos complement offset value to be
automatically added to or subtracted from the local
temperature reading. LSB value = 0.5°C.
Description
Remote 2 temperature offset.
Allows a twos complement offset value to be
automatically added to or subtracted from the
Remote 2 temperature reading. This is to
compensate for any inherent system offsets such as
PCB trace resistance. LSB value = 0.5°C.
Rev. A | Page 72 of 80
Reserved
V
V
Reserved
Reserved
Remote 1 temperature
Local temperature
Remote 2 temperature
CCP
CC
(3.3 V)
Power-On Default
0x00
Power-On Default
0x00
CCP
input. The V
CCP
input