ADT7460 Analog Devices, Inc., ADT7460 Datasheet - Page 20

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

ADT7460
LIMITS, STATUS REGISTERS,
Limit Val
Associ
are hig
status
condit
SM
microcontroller of out-of-limit conditions
8-Bit Lim
The fo
Table 19. Volta
Regist
0x44
0x45
0x48
0x49
Table 20. Temp
Regist
0x4E
0x4F
0x6A
0x50
0x51
0x6B
0x52
0x53
0x6C
Table 21. THERM Timer Limit Register
Register
0x7A
16-Bit Limits
The fan
limits a
Since f
condit
Since fa
the limit indicates a slow or stalled
Table 22. Fan Limit Registers
Register
0x54
0x55
0x56
0x57
0x58
0x59
0x5A
0x5B
BALERT
monitoring:
ion and dete
ions of in
ated with ea
llowing is
er
er
ans run
h and low li
re also 1
n TACH
TACH
ues
its
interrupts can be generated to flag a processor or
ning under speed or stalled a
TACH4 minimum low byte
Description
TACH1 minimum low byte
TACH1 minimum high byte
TACH2 minimum low byte
TACH2 minimum high byte
TACH3 minimum low byte
TACH3 minimum high byte
TACH4 minimum high byte
measurements are 16-bit res
6 bits, consisting of a high b
terest, only high limits exist fo
ge Lim
eratur
Description
Remote 1 temperature low limit
Remote 1 temperature high
limit
Remote 1 THERM limit
Local temperature low limit
Local temperature high limit
Local THERM limit
Remote 2 temperature low limit
Remote 2 temperature high
limit
Remote 2 THERM limit
Description
THERM timer limit
a list of 8-bit limits on the ADT74 0.
period is actually being me
ch measuremen
mits. These can fo
a status bit can b
cted by polling
Description
2.5 V low limit
2.5 V high limit
V
V
CC
CC
low limit
high limit
e Limit Registers
it Registers
the device. Altern
t channel on the ADT7460
fan.
e set for any out
AND INTERRUPTS
rm the basis of
.
re norma
yte and lo
ults. The fa
asured, ex
r fan TA
Default
0x00
6
-of-lim
Defau
0x00
0xFF
0x00
0xFF
Defau
0x81
0x7F
0x64
0x81
0x7F
0x64
0x81
0x7F
0x64
system
atively
lly the o
w byte
Default
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
0xFF
ceedin
CHs.
n TA
lt
lt
,
it
CH
.
Rev. C | Page 20 of 52
nly
g
Out-of-Limit Comparisons
Once all limits have been programmed, the ADT7460 can be
enabled for monitoring. The ADT7460 measures all parameters
in round-robin format and sets the appropriate status bit for
out-of-limit conditions. Comparisons are done differently
depending on whether the measured value is being compared to
a high or low limit.
•
•
High limit: > comparison performed
Low limit: < or = comparison performed
Figure 30. Temperature = Low Limit: INT Occurs
Figure 29. Temperature > Low Limit: No INT
INT
LOW LIMIT
TEMP = LOW LIMIT
TEMP > LOW LIMIT
NO INT
LOW LIMIT