ADFS5758 datasheet(48/75 Pages) AD

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ADFS5758

Data Sheet

Rev. 0 | Page 48 of 75

SELECT DEPTH

(NUMBER OF CHANNELS)

LOAD DESIRED CHANNEL

N INTO THE SEQUENCER

ENABLE FOR AUTO/

KEY SEQUENCING

IS N = DEPTH – 1?

DATA[D7:D5]

COMMAND[D10:D8]

DIAGNOSTIC SELECT[D4:D0]

011

001

DON’T CARE

ENABLE AUTOMATIC SEQUENCING

N = 0

N = 1

N = 2

DATA[D7:D5]

COMMAND[D10:D8]

DIAGNOSTIC SELECT[D4:D0]

001

010

VLDO MUX

INPUT ADDRESS

SELECT CHANNEL 2 WITH VLDO

DATA[D7:D5]

COMMAND[D10:D8]

DIAGNOSTIC SELECT[D4:D0]

001

DIE TEMP MUX

INPUT ADDRESS

SELECT CHANNEL 1 WITH MAIN DIE TEMPERATURE

DATA[D7:D5]

COMMAND[D10:D8]

DIAGNOSTIC SELECT[D4:D0]

001

000

ADC1 PIN MUX

INPUT ADDRESS

SELECT CHANNEL 0 WITH ADC1 PIN

DATA[D7:D5]

COMMAND[D10:D8]

DIAGNOSTIC SELECT[D4:D0]

000

010

DON’T CARE

SELECT A DEPTH OF 3 CHANNELS

Figure 87. Example Automatic Sequence Mode Setup for Three ADC Input Nodes

ADC Conversion Timing

Figure 88 shows an example where autostatus readback mode is

enabled. The status register always contains the last completed

ADC conversion result, together with the associated mux

address, ADC_IP_SELECT.

This example is applicable irrespective of the ADC conversion

mode in use (key sequencing, automatic sequencing, single

immediate conversion, or single key conversion). During the

first ADC conversion command shown, the contents of the

status register are available on the SDO line. The ADC portion

of this data contains the conversion result of the previously

converted ADC node (ADC Conversion Result 0), as well as the

associated channel address. Assuming another SPI frame is not

received while the ADC is busy converting due to Command 1,

then the next data to appear on the SDO line contains the

associated conversion result, ADC Conversion Result 1. If,

however, an SPI frame is received while the ADC is busy, the

status register contents available on SDO still contains the

previous conversion result and indicates the ADC_BUSY flag is

high. Any new ADC conversion instructions received while the

ADC_BUSY bit is active are ignored. If using a sequencer mode,

the sequencer address is updated after the conversion is complete.

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