Analog Devices ADT7473 Manual page 69

Table 42. Remote 2 Temperature Offset
1
Register Address R/W
0x72 Read/write
<7:0> 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 43. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit Name
0 FanPresenceDT
1 Fan1 Detect
2 Fan2 Detect
3 Fan3 Detect
4 AVG
5 ATTN
6 CONV
7 SHDN
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 44. Register 0x74—Interrupt Mask Register 1 (Power-On Default <7:0> = 0x00)
Bit Name R/W
1 V Read/write
CCP
2 V Read/write
CC
4 RIT Read/write
5 LT Read/write
6 R2T Read/write
7 OOL Read/write
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.
1
R/W Description
Read/write When FanPresenceDT=1, the state of bits <3:1> of 0x73 reflects the presence of a
4-wire fan on the appropriate TACH channel.
Read Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM 1 input.
Read Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM 2 input.
Read Fan1 Detect = 1 indicates a 4-wire fan is connected to the PWM 3 input.
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.
Read/write ATTN = 1, the ADT7473 removes the attenuators from the V
input can be used for other functions such as connecting up external sensors.
Read/write CONV = 1, the ADT7473 is put into a single-channel ADC conversion mode. In this
mode, the ADT7473 can be made 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
Read/write SHDN = 1, ADT7473 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 the fans are not being driven.
Description
V = 1, masks SMBALERT for out-of-limit conditions on the V
CCP
V = 1, masks SMBALERT for out-of-limit conditions on the V
CC
RIT = 1, masks SMBALERT for out-of-limit conditions on the Remote 1 temperature channel.
LT = 1, masks SMBALERT for out-of-limit conditions on the local temperature channel.
R2T = 1, masks SMBALERT for out-of-limit conditions on the Remote 2 temperature channel.
OOL = 1, masks SMBALERT for any out-of-limit condition in Status Register 2.
Rev. 0 | Page 69 of 76
Reserved.
V
CCP.
V (3.3 V).
CC
Reserved.
Reserved.
Remote 1 temperature.
Local temperature.
Remote 2 temperature.
ADT7473
Power-On Default
0x00
input. The V
CCP
channel.
CCP
channel.
CC
CCP