MAX17823H datasheet(33/129 Pages) MAXIM

33 / 129 page

Scan Modes

The cell, block, and diagnostic measurement cycle con-

sists of two conversion phases. In each phase, the ADC

scans through the enabled input channels. There are

two scan modes configured by the SCANMODE bit. If

SCANMODE = 0, the mode is pyramid mode as shown in

Figure 9. If SCANMODE = 1, the mode is top-down mode.

In pyramid mode, the ADC scans first ascending and then

descending. In top-down mode, the ADC scans descend-

ing in both phases. In the second scan, the amplifier

inputs are inverted to effectively chop out any offset and

reference-induced errors. The two conversions are then

offset corrected and averaged in the ALU.

After the cell and block scans are complete, the diag-

nostic conversions are made, if enabled, and finally, the

auxiliary inputs, if enabled, are converted. The auxiliary

inputs are measured using a single conversion and stored

in the AIN1 and AIN2 registers. Any extra settling time,

if configured by AINCFG[5:0], is implemented just before

the conversion for each AUXIN channel and so if both

inputs are enabled, the extra settling time occurs twice.

Figure 9. Acquisition, OVSAMP[2:0] = 0h and SCANMODE = 0

Figure 10. Acquisition, OVSAMP[2:0] > 0 and SCANMODE = 0

C1+

C2+

C3+

C4+

C5+

C6+

C7+

C8+

C9+

C10+

C11+

C12+

C1-

C2-

C3-

C4-

C5-

C6-

C7-

C8-

C9-

C10-

C11-

C12-

SAMPLING POINT

DELAY TIME TO SWITCH

REF AMP TO CHOP

SAMPLE 1

C1+

C2+

C3+

C4+

C5+

C6+

C7+

C8+

C9+

C10+

C11+

C12+

C1-

C2-

C3-

C4-

C5-

C6-

C7-

C8-

C9-

C10-

C11-

C12-

SAMPLING POINT

DELAY TIME TO SWITCH

REF AMP TO CHOP

PUMP TO

REFRESH HV

SAMPLE 2

SAMPLE n

100.3µs

MAX17823H

12-Channel, High-Voltage

Data-Acquisition Systems

www.maximintegrated.com

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MAX17823H Datasheet(PDF) 33 Page - Maxim Integrated Products

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