ADT7463
http://onsemi.com
22
The total number of channels measured is:
" Four Dedicated Supply Voltage Inputs
" 3.3 V
STBY
or 5 V Supply (V
CC
Pin)
" Local Temperature
" Two Remote Temperatures
As mentioned previously, the ADC performs roundrobin
conversions and takes 11.38 ms for each voltage
measurement, 12 ms for a local temperature reading, and
25.5 ms for each remote temperature reading.
The total monitoring cycle time for averaged voltage and
temperature monitoring is therefore nominally
(
5 11.38
)
) 12
(
2 25.5
)
+ 120 ms
(eq. 2)
Fan TACH measurements are made in parallel and are not
synchronized with the analog measurements in any way.
Status Registers
The results of limit comparisons are stored in Status
Registers 1 and 2. The status register bit for each channel
reflects the status of the last measurement and limit
comparison on that channel. If a measurement is within
limits, the corresponding status register bit is cleared to 0. If
the measurement is outoflimits, the corresponding status
register bit is set to 1.
The state of the various measurement channels may be
polled by reading the status registers over the serial bus. In
Bit 7 (OOL) of Status Register 1 (Reg. 0x41), 1 means that
an outoflimit event has been flagged in Status Register 2.
This means that a user need only read Status Register 2 when
this bit is set. Alternatively, Pin 10 or Pin 22 can be
configured as an SMBALERT
output. This automatically
notifies the system supervisor of an outoflimit condition.
Reading the status registers clears the appropriate status bit
as long as the error condition that caused the interrupt has
cleared. Status register bits are sticky. Whenever a status
bit gets set, indicating an outoflimit condition, it remains
set even if the event that caused it has gone away (until read).
The only way to clear the status bit is to read the status
register after the event has gone away. Interrupt status mask
registers (Reg. 0x74, 0x75) allow individual interrupt
sources to be masked from causing an SMBALERT
.
However, if one of these masked interrupt sources goes
outoflimit, its associated status bit gets set in the interrupt
status registers.
Figure 32. Status Register 1
OOL = 1 DENOTES A PARAMETER
MONITORED THROUGH STATUS REG 2
IS OUTOFLIMIT
Table 27. STATUS REGISTER 1 (REG. 0X41)
Bit
Mnemonic
Description
7
OOL
1: denotes a bit in Status Register 2 is
set and Status Register 2 should be
read.
6
R2T
1: Remote 2 Temperature High or Low
Limit has been exceeded.
5
LT
1: Local Temperature High or Low Limit
has been exceeded.
4
R1T
1: Remote 1 Temperature High or Low
Limit has been exceeded.
3
5V
1: 5 V High or Low Limit has been
exceeded.
2
V
CC
1: V
CC
High or Low Limit has been
exceeded.
1
V
CCP
1: V
CCP
High or Low Limit has been
exceeded.
0
2.5V
1: 2.5 V High or Low Limit has been
exceeded.
Figure 33. Status Register 2
F4P = 1, FAN 4 OR THERM
TIMER IS OUTOFLIMIT
Table 28. STATUS REGISTER 2 (REG. 0X42)
Bit
Mnemonic
Description
7
D2
1 indicates an open or short on
D2+/D2 inputs.
6
D1
1 indicates an open or short on
D2+/D2 inputs.
5
F4P
1 indicates that Fan 4 has dropped
below minimum speed. Alternatively,
indicates that THERM
limit has been
exceeded if the THERM
function is
used.
4
FAN3
1 indicates that Fan 3 has dropped
below minimum speed.
3
FAN2
1 indicates that Fan 2 has dropped
below minimum speed.
2
FAN1
1 indicates that Fan 1 has dropped
below minimum speed.
1
OVT
1 indicates that a THERM
overtemperature limit has been
exceeded.
0
12V/VC
1 indicates that 12 V High or Low Limit
has been exceeded. If the VID code
change function is used, this bit
indicates a change in VID code on the
VID0 to VID5 inputs.
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