AD7293 datasheet(29/78 Pages) AD

29 / 78 page

Data Sheet

AD7293

Rev. B | Page 29 of 78

If a conversion result exceeds the high or low limit set in the

alert limits register, the AD7293 signals an alert in one or more

of the following ways:

•

Via hardware using the GPIO3/ALERT0 and

GPIO4/ALERT1 pins

•

Via software using the alert bits or registers on the alert

page (Page 0x10).

ALERTx Pins

Two pins can be configured as ALERTx pins. On power-up,

Pin 2 (GPIO4/ALERT1) is configured as an alert whereas

Pin 53 is configured as a GPIO (GPIO3/ALERT0). When these

pins are configured as ALERTx pins, any combination of high

and low alerts on any of the ADC channels can route to these

pins. The polarity of the alert output pins can be set to active

high or active low via the digital function polarity register on

the configuration page.

If an alert pin signals an alert event and the contents of the alert

flags registers are not read before the next conversion is completed,

the contents of the register may change if the out of range signal

returns to the specified range. In this case, the ALERT0 or

ALERT1 pin no longer signals the occurrence of an alert event.

Software Alerts Page

The alert summary register (Register 0x10) contains a summary of

alerts for the voltage, temperature sensor, current sensor, and

other monitoring inputs that have violated limits. See the Alert

Summary (ALERTSUM) Register (Register 0x10) section.

To gather more detailed information, the remaining registers

contain two individual status bits per channel: one corresponding

to the high limit and the other corresponding to the low limit.

A bit with a status of one shows the channel on which the

violation occurred and whether the violation occurred on the

high or low limit.

Figure 49. Software Alerts Page

GPIO0 to GPIO3 Routing to ALERT1

A bit in the general register allows the GPIO0 to GPIO3 status

to route to the ALERT1 pin. Set GPIO0 to GPIO3 up as inputs

(bit set to 0 in the digital output enable register). If the GPIO is

read as 1, this read appears on ALERT1, and the GPIO register

can be read for the status of the pin to detect which pin has

caused ALERT1 to become active.

D11

D10

D11

D10

D11

D10

D15

D14

D13

D12

D11

D10

ALERT

FLAG

VIN

ALERT

TSENSE

ALERT

ISENSE

ALERT

SUPPLY

AND

BI-VOUTxMON

ALERT

RSx+MON

ALERT

INTLIMIT AND

AVSS/AVDD

ALERT

VIN3 HIGH ALERT

VIN2 HIGH ALERT

VIN1 HIGH ALERT

VIN0 HIGH ALERT

VIN3 LOW ALERT

VIN2 LOW ALERT

VIN1 LOW ALERT

VIN0 LOW ALERT

TSENSED1 HIGH ALERT

TSENSED0 HIGH ALERT

TSENSEINT HIGH ALERT

TSENSED1 LOW ALERT

TSENSED0 HIGH ALERT

TSENSEINT LOW ALERT

ISENSE3 HIGH ALERT

ISENSE2 HIGH ALERT

ISENSE1 HIGH ALERT

ISENSE0 HIGH ALERT

ISENSE3 LOW ALERT

ISENSE2 LOW ALERT

ISENSE1 LOW ALERT

ISENSE0 LOW ALERT

BI-VOUT3MON HIGH ALERT

BI-VOUT2MON HIGH ALERT

BI-VOUT1MON HIGH ALERT

BI-VOUT0MON HIGH ALERT

BI-VOUT3MON LOW ALERT

BI-VOUT2MON LOW ALERT

BI-VOUT1MON LOW ALERT

BI-VOUT0MON LOW ALERT

AVSS LOW ALERT

AVDD LOW ALERT

AVSS HIGH ALERT

DACVDD-BI HIGH ALERT

DACVDD-UNI HIGH ALERT

DACVDD-BI LOW ALERT

DACVDD-UNI LOW ALERT

RS3+MON HIGH ALERT

RS2+MON HIGH ALERT

RS1+MON HIGH ALERT

RS0+MON HIGH ALERT

RS3+MON LOW ALERT

RS2+MON LOW ALERT

RS1+MON LOW ALERT

RS0+MON LOW ALERT

INTLIMIT3 HIGH ALERT

INTLIMIT2 HIGH ALERT

INTLIMIT1 HIGH ALERT

INTLIMIT0 HIGH ALERT

AVSS/AVDD ALARM

AVDD HIGH ALERT

AD7293 Datasheet(PDF) 29 Page - Analog Devices

AD7293 Datasheet(HTML) 29 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78

Datasheet Download

Link URL