ADT7460 Analog Devices, Inc., ADT7460 Datasheet - Page 47

• Manufacturer Part Number: ADT7460
• Description: Dbcool? Remote Thermal Controller And Fan Controller
• Manufacturer: Analog Devices, Inc.

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