Analog Devices ADT7460 Manual page 47

Table 70. Register 0x73—Configuration Register 2 (Power-On Default = 0x00)
Bit Na me R/ W
0 AIN 1 Re ad/Write
1 AIN2 Read/Write
2 AIN 3 Read/Write
3 AIN 4 Read/Write
4 AVG Read/Write
5 ATTN Read/Write
6 CONV Read/Write
7 SH DN Read/Write
This regi ster beco es read-on m
effect.
T able 71. Register 0x74—Interrupt Mask Register 1 (Power-On Default <7:0> = 0x00)
Bit Name R/W
0 2.5V Read/Write
1 RES Read/Write
2 V Rea d/Write
CC
3 R ES Rea d/Write
4 R 1T Read/Write
5 LT Read/Write
6 R 2T Read/Write
7 O OL Read/Write
D escription
AI N1 = 0, Speed of 3-wire fa
re configured to measure the speed of 2-wire fans using an extern
ca pacitor. AIN voltage threshold is set via
AIN2 = 0, Speed of 3-wire fans measured using th
re configured to measure the speed of 2-w
ca pacitor. AIN voltage threshold is set via
AI N3 = 0, Speed of 3-wire fans measured using the TACH output from the fan. AIN3 = 1, Pin 4 is
re configured to measure the speed of 2
ca pacitor. AIN voltage threshold is set via Configuration Register 4 (Reg. 0
AI N4 = 0, Speed of 3-wire fans measured using the TACH output from the
reconfigured to measure the sp
capacitor. AIN voltage threshold is set via Configuration Register 4 (Reg. 0x7D).
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 ADT7460 remo
functions such as connecting up external se
CONV = 1, the A DT7460 is put into a single-channel ADC conver
be made to read continuously from one input only, for example,
to start ADC conversions using an external clock on Pin 6 by setting Bit 2 of Test Register 2 (Reg. 0x7F). This
m ode could be useful if, for example, users wanted to charac
ap propriate ADC channel is
Bits <7:5> Reg. 0x55
000
010
101
110
111
SH DN = 1, ADT7 460 goes into shutdown mode. All PWM outputs assert low (or high depending, on state
of INV bit) to switch off all fans. T
ar e not being driven.
ly w hen the Configuration Register 1 lock bit is set to 1. Further attempts to write to this regis
Description
A 1 masks SMBALERT for out-of-limit conditions on the 2.5 V channel.
Reserved for future use.
A 1 masks SMBALERT for out-of-limit conditions on the V
R eserved for future use.
A 1 masks SMBALERT for out-of-limit conditions on the Remote 1 temperature channel.
A 1 masks SMBALERT for out-of-limit conditions on the Local temperature channel.
A 1 masks SMBALERT for out-of-limit conditions on the Remote 2 temperature channel.
A 1 masks SMBALERT for any out-of-limit condition in Status Register 2.
ns measured using the TACH output from the fan. AIN1 = 1, Pin 6 is
Configuration Register 4 (Reg. 0x7D).
e TACH output from the fan. AIN2 = 1, Pin 7 is
ire fans using an external sensing resistor and coupling
Configuration Register 4 (Reg. 0x7D).
-wire fans using an external sensing resistor and coupling
eed of 2-wire fans using an external sensing re
ves the attenuators from the 2.5 V input. The input can be used for other
nsors.
selected by writing to Bits <7:5> of TACH1 min high byte register (Reg. 0x55).
Channel Selected
2.5 V
V (3.3 V)
CC
Remote 1 Temp
Local Temp
Remote 2 Temp
he PWM current duty cycle registers read 0x00 to indicate that the fans
Rev. C | Page 47 of 52
al sensing resistor and coupling
x7D).
fan. AIN4 = 1, Pin 9 is
sistor and coupling
sion mode. In this mode, the ADT7460 can
Remote 1 temperature. It is also possible
terize/profile CPU temperature quickly. The
channel.
CC
ADT7460
ter have no