MCP2030 datasheet(36/66 Pages) MICROCHIP

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MCP2030

DS21981A-page 36

5.15

Configurable Output Enable Filter

The purpose of this filter is to enable the LFDATA out-

put and wake the external microcontroller only after

receiving a specific sequence of pulses on the LC input

pins. Therefore, it prevents waking up the external

microcontroller due to noise or unwanted input signals.

The circuit compares the timing of the demodulated

header waveform with a pre-defined value, and

enables the demodulated LFDATA output when a

match occurs.

The output enable filter consists of a high (TOEH) and

low duration (TOEL) of a pulse immediately after the

AGC settling gap time. The selection of high and low

times further implies a max period time. The output

enable high and low times are determined by SPI

programming. Figure 5-3 and Figure 5-4 show the

output enable filter waveforms.

There should be no missing cycles during TOEH.

Missing cycles may result in failing the output enable

condition.

FIGURE 5-3:

Output Enable Filter Timing.

Data Packet

≥ TOEH

≥ TOEL

Required Output Enable Sequence

LFDATA output is enabled

on this rising edge

≤ TOET

Demodulator

Output

TGAP

Device Wake-up

Start bit

AGC

(TAGC + TPAGC)

TSTAB

and AGC Stabilization

Gap Pulse

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