Datasheet

Data Sheet AD7292
Rev. 0 | Page 39 of 40
ALERT FLAGS REGISTER BANK
The alert flags register bank contains two subregisters: the ADC
alert flags subregister and the T
SENSE
alert flags subregister. The
ADC alert flags subregister stores alerts for the analog voltage
conversion channels, VIN0 to VIN7. The T
SENSE
alert flags sub-
register stores alerts for the temperature sensor channel. These
subregisters contain two status bits per channel: one correspond-
ing to the high limit, and the other corresponding to the low
limit (see Table 33 and Table 34). A bit with a status of 1 shows
the channel on which the violation occurred and whether the
violation occurred on the high or low limit.
If additional alert events occur on any other channels after the
first alert is triggered but before the alert flags subregister is read,
the corresponding bits for the new alert events are also set. For
example, if Bit D14 in the ADC alert flags subregister is set to 1,
the low limit on Channel 7 has been exceeded, whereas if Bit D3
is set to 1, the high limit on Channel 1 has been exceeded.
An alert associated with either the alert high limit or alert low
limit subregister is cleared automatically after the monitored
signal is back in range, that is, when the conversion result returns
between the configured high and low limits. The contents of the
alert flags subregister are updated after each conversion.
To find out which channel or channels caused the alert flag, the
user must read the ADC alert flags subregister or the T
SENSE
alert
flags subregister. If the ADC alert flags subregister or the T
SENSE
alert flags subregister is accessed with both the read and write bits
of the address pointer set to 1, the stored alert flags can be read
and reset in one operation. A blanket reset can be performed by
writing 0xFFFF to the ADC alert flags subregister, or 0x0003 to
the T
SENSE
alert flags subregister, thus clearing all alert flags.
MINIMUM AND MAXIMUM CONVERSION RESULTS
The read-only minimum/maximum register bank contains the
minimum and maximum conversion values for each of the eight
analog input channels and the temperature sensor channel.
Values are 10-bit, left justified.
The minimum and maximum subregisters are cleared when a
value is written to them—that is, they return to their power-up
values. This means that if a subregister is accessed with both the
read and write bits set, the stored minimum or maximum value
can be read and reset in one operation. On power-up, the mini-
mum value subregisters contain 0xFFC0, and the maximum value
subregisters contain 0x0000.