ADC3908CSSS datasheet(46/131 Pages) TI1

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CHA 10-bit data/DDC data

ALERT

CHB 10-bit data/DDC data

STATx DATA

SEL[3:0]

Statistic

Engine

ALERT_CFG

STAT_CFG

Data High CNT

Data Low CNT

Min

Max

Sum Data**2

ALERT_Flag

HIGH_THR [15:0]

LOW_THR [15:0]

SPI

SEN

SCLK

SDIO

SUM Data

Figure 6-29. Statistics Engine Block Diagram

6.3.6.3.1 Statistics Engine Data Select

Each statistics engine has the capability of selecting either channel with or without decimation data via SPI write

(0x201, 0x204).

ADC A

ADC B

Statistics

Engine A

SPI

Interface

Statistics

Engine B

Channel

Correction

Channel

Correction

Figure 6-30. Statistics engine data multiplexer

6.3.6.3.2 Window Configuration

The window size is configured in STATS_WINDOW_SIZE_CHx (0x1A0-0x1A3) in steps of 256 samples.

Minimum window size is 256 samples up to a maximum of 256 * 216 samples. The device records the

statistics for the current window (N) and up to 3 previous windows (N-1, N-2, N-3). By default the statistics

engine continously collects data when enabled and the ADCs are sampling or the single shot mode enabled in

1SHOT_CHx (0x1A4) to collect data over a single window.

6.3.6.4 Digital Alerts

The digital alert functionality can be used in conjunction with the comparator to monitor input signal conditions

or to detect over-ranging in the ADC or digital blocks. The alert function can be configured in several different

ways via the SPI registers. These registers are enabled with bit masks so the behavior of multiple sources can

be used to trigger the ALERT pin.

Available Alert triggers:

• Greater than, equal to, or less than either comparator's high or low threshold

• All ones or all zeros detected by either comparator

• Statistics engine window complete

• Over-range in the ADC, channel corrections, decimation or output formatter blocks

See register 0x1B4 for full list of available alert triggers.

ADC3910D125

SBASAD1 – DECEMBER 2023

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