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ZSSC1750 / ZSSC1751 Datasheet

April 20, 2016

The voltage accumulator is reset to 0 under these conditions:

• On assertion of startAdcV (rising edge) in the FP State

• At start of the first conversion in the LP or ULP State

• Each time the result counter is reset (if the result counter is enabled)

Note: The voltage accumulator functionality can be used to calculate the mean value of the voltage.

After the last accumulation within an MRCS, the upper 16 bits of the voltage accumulator are compared to the

voltage threshold adcVTh, which is interpreted as a signed value in this case. This comparison can be used to

generate a “set interrupt” strobe for irqStat[9]; however, to enable the generation of the “set interrupt” strobe,

bit VThWuEna in register adcAcmp must be set to 1.

The “set interrupt” strobe is generated when

• adcVTh is greater than 0 and adcVaccu is less than or equal to adcVTh

• adcVTh is lower than 0 and adcVaccu is greater than or equal to adcVTh

• adcVTh is equal to 0 and adcVaccu is equal to 0

Important: The threshold adcVTh is either interpreted as an unsigned or signed value depending on the

operation mode (VThSel).

Note: The voltage comparators compare only on the MSBs of the conversion result, so it might be beneficial to

use the post-correction gain functionality to shift left the results to increase the accuracy of the comparison.

3.8.3.19

Table 3.46 Register adcVTh

Name

Address

Bits

Default

Access

Description

adcVTh[7:0]

46HEX

[7:0]

00HEX

Voltage threshold.

If VThSel == 0, then adcVTh is interpreted as an

unsigned value and it is compared to the absolute

value of a single voltage conversion.

If VThSel == 1, then adcVTh is interpreted as a

signed value and it is compared to the accumu-

lated voltage conversion results at the end of an

MRCS.

adcVTh[15:8]

47HEX

[7:0]

00HEX

3.8.3.20

Table 3.47 Register adcVaccu

Name

Address

Bits

Default

Access

Description

adcVaccu[7:0]

10HEX

[7:0]

00HEX

Present voltage accumulator value

adcVaccu[15:8]

11HEX

[7:0]

00HEX

adcVaccu[23:16]

12HEX

[7:0]

00HEX

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