ADE1201 datasheet(19/40 Pages) AD

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Data Sheet

ADE1201

Rev. 0 | Page 19 of 40

Comparator in GT Mode

In GT mode, when the ADC output is greater than the high

threshold level, the comparator output is set high. The

comparator output is set low when the ADC output drops

below the high threshold level. The behavior of the comparator

in GT output mode is shown in Figure 27.

TIME

HIGH THRESHOLD

LEVEL

ADC

OUTPUT

COMPARATOR

OUTPUT

TIME

Figure 27. Comparator Behavior in GT Output Mode

Comparator in LT Mode

In LT mode, when the ADC output is lower than or equal to the

high threshold level, the comparator output is set high. The

comparator output is set low when the ADC output is greater

than the high threshold level. The behavior of the comparator in

LT output mode is shown in Figure 28.

TIME

HIGH THRESHOLD

LEVEL

ADC

OUTPUT

COMPARATOR

OUTPUT

TIME

Figure 28. Comparator Behavior in LT Output Mode

Debounce Function

A debounce filter follows the comparator in each datapath.

Each debounce filter consists of a counter that increments every

20 µs. The maximum debounce time is 163.82 ms. A filter

length of 0 means the debounce filter is bypassed. To calculate

the filter length, use the following equation:

Filter Length = Debounce Time/Channel Update

where:

Filter Length is the value that is written in the

BIN_FILTER_VAL, WARNA_FILTER_VAL,

WARNB_FILTER_VAL, and WARNC_FILTER_VAL bit fields.

Debounce Time is the desired length of the filter expressed in µs.

Channel Update is 20 µs.

The debounce filter can function in two modes, managed by

Bit 14 of the BIN_FILTER, WARNA_FILTER, WARNB_FILTER,

and WARNC_FILTER registers. If Bit 14 is 0 (the default value)

the filter is in up/clear mode. If Bit 14 is 1, the filter is in

up/down mode.

Debounce Function Up/Clear Mode

In up/clear mode, the filter counter increments while the

comparator output is high until the counter reaches the filter

length. If the comparator output goes low before the filter

length has been reached, the counter is cleared.

When the filter length has been reached, the filter output goes

high. The counter stops incrementing when the comparator

output is high. The counter is decremented when the comparator

output goes low. When the counter decrements to 0, the filter

output goes low. If the comparator output goes from low to high

before the counter decrements to 0, the counter is reset to the

filter length.

Debounce Function Up/Down Mode

In up/down mode, the filter counter increments while the

comparator output is high until the counter reaches the filter

length. If the comparator output is low, the counter is

decremented.

When the filter length has been reached, the filter output goes

high. The counter stops incrementing when the comparator

output is high. When the comparator output is low, the counter

is decremented. When the counter decrements to 0, the filter

output goes low.

See Figure 29 for an example of the debounce filter working in

up/down mode and up/clear mode.

The output of the debounce filter can be read through the SPI

in the corresponding DOUT1, WARNA1, WARNB1, and

WARNC1 bits in the STATUS register, and the DOUT1 filter

output represents the status for the IN1 filter output.

The status of the DOUT1 filter output is reflected on the

DOUT1 pin. The debounce filter outputs can be configured to

trigger an interrupt on the IRQ pin (see the Interrupt section).

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