AD7292 datasheet(32/41 Pages) AD

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Data Sheet

AD7292

ALERT FLAGS REGISTER BANK (ADDRESS 0x07)

If a conversion result activates an alert (as specified in the alert

limits register bank), the alert flags register bank can be read

to obtain more information about the alert. This register bank

contains the ADC alert flags and TSENSE alert flags subregisters.

Both subregisters store flags that are triggered when the mini-

mum or maximum conversion limits, as defined in the alert

limits register bank, are exceeded.

Table 32. Alert Flags Register Bank Subregisters

Bits in the alert flags subregisters can be reset by writing 1 to the selected bits.

ADC Alert Flags and TSENSE Alert Flags Subregisters

(Address 0x00 and Address 0x02)

The ADC alert flags subregister stores alerts for the analog volt-

age conversion channels, VIN0 to VIN7. The TSENSE alert flags

subregister stores alerts for the temperature sensor channel.

These subregisters contain two status bits per channel: one

corresponding to the high limit, and the other corresponding to

the low limit. 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.

To find out which channel or channels caused the alert flag, the

user must read the ADC alert flags subregister or the TSENSE alert

flags subregister. If the ADC alert flags subregister or the TSENSE

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 TSENSE alert flags subregister, thus clearing all alert flags.

Table 33. ADC Alert Flags Subregister, Bit Function Descriptions

Bits

Bit Name

R/W

Description

D15

VIN7 high limit flag

R/W

1 = VIN7 high limit exceeded

D14

VIN7 low limit flag

R/W

1 = VIN7 low limit exceeded

D13

VIN6 high limit flag

R/W

1 = VIN6 high limit exceeded

D12

VIN6 low limit flag

R/W

1 = VIN6 low limit exceeded

D11

VIN5 high limit flag

R/W

1 = VIN5 high limit exceeded

D10

VIN5 low limit flag

R/W

1 = VIN5 low limit exceeded

VIN4 high limit flag

R/W

1 = VIN4 high limit exceeded

VIN4 low limit flag

R/W

1 = VIN4 low limit exceeded

VIN3 high limit flag

R/W

1 = VIN3 high limit exceeded

VIN3 low limit flag

R/W

1 = VIN3 low limit exceeded

VIN2 high limit flag

R/W

1 = VIN2 high limit exceeded

VIN2 low limit flag

R/W

1 = VIN2 low limit exceeded

VIN1 high limit flag

R/W

1 = VIN1 high limit exceeded

VIN1 low limit flag

R/W

1 = VIN1 low limit exceeded

VIN0 high limit flag

R/W

1 = VIN0 high limit exceeded

VIN0 low limit flag

R/W

1 = VIN0 low limit exceeded

Table 34. TSENSE Alert Flags Subregister, Bit Function Descriptions

Bits

Bit Name

R/W

Description

[D15:D2]

Reserved

R/W

Reserved

TSENSE high limit flag

R/W

1 = TSENSE high limit exceeded

TSENSE low limit flag

R/W

1 = TSENSE low limit exceeded

Subaddress (Hex)

Subregister Name1

0x00

ADC alert flags subregister

0x01

Reserved

0x02

TSENSE alert flags subregister

0x03 to 0xFF

Reserved

Rev. A | Page 31 of 40

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