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ADT7467
Table 73. REGISTER 0X71 ? LOCAL TEMPERATURE OFFSET (POWER-ON DEFAULT = 0X00)
Bit
<7:0>
R/W (Note 1)
Read/Write
Description
Allows a twos complement offset value to be automatically added to or subtracted from the local
temperature reading. LSB value = 0.5 ? C.
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.
Table 74. REGISTER 0X72 ? REMOTE 2 TEMPERATURE OFFSET (POWER-ON DEFAULT = 0X00)
Bit
<7:0>
R/W (Note 1)
Read/Write
Description
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.
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.
Table 75. REGISTER 0X73 ? CONFIGURATION REGISTER 2 (POWER-ON DEFAULT = 0X00)
Bit
<0>
Name
AIN1
R/W (Note 1)
Read/Write
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 (0x7D). Only relevant in low frequency mode.
<1>
AIN2
Read/Write
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 (0x7D). Only relevant in low frequency mode.
<2>
<3>
AIN3
AIN4
Read/Write
Read/Write
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 (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 (0x7D). Only relevant in low frequency mode.
<4>
<5>
<6>
AVG
ATTN
CONV
Read/Write
Read/Write
Read/Write
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 CCP input. The V CCP
input 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 the TACH1 minimum high byte register (0x55).
Bits <7:5>, Register 0x55
000 Reserved
001 V CCP
010 V CC (3.3 V)
011 Reserved
100 Reserved
101 Remote 1 Temperature
110 Local Temperature
111 Remote 2 Temperature
<7>
SHDN
Read/Write
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.
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.
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