APGRD001 Microchip Technology, APGRD001 Datasheet - Page 4
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
APGRD001
Manufacturer Part Number
APGRD001
Description
REF DESIGN PKE PIC16F639
Manufacturer
Microchip Technology
Type
PKE, RKEr
Specifications of APGRD001
Frequency
125kHz
Processor To Be Evaluated
PIC16F639
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
PIC16F639, PIC16F636, PIC18F2680
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
AN1024
Wake-up Filter and Signal Detection
Users can program one of the nine possible Output
Enable filters using the Configuration registers. Refer to
the PIC12F635/PIC16F636/639 Device Data Sheet
(DS41232) for more details (see “References”).
Figures 3 and 4
demodulated outputs. The input signal is applied to one
of the three input pins or on all pins (LCX, LCY, LCZ) at
the same time. The outputs are available on the
LFDATA pin of the device. The figures show the
differences in output pins depending on the setting of
the output enable (wake-up) filter option. For the cases
shown in Figure 3 and Figure 4, the minimum
FIGURE 3:
FIGURE 4:
DS01024B-page 4
show
INPUT SIGNAL AND DEMODULATED OUTPUT WHEN OUTPUT ENABLE FILTER IS
ENABLED AND INPUT MEETS THE FILTER TIMING REQUIREMENT
INPUT SIGNAL AND DEMODULATED OUTPUT WHEN OUTPUT ENABLE FILTER IS
ENABLED AND INPUT DOES NOT MEET THE FILTER TIMING REQUIREMENT
examples
of
inputs
and
modulation depth requirement is set to 8% and the
Output Enable Filter is set to (T
The input signal amplitude is 2.7 mV
modulation depth of about 9%. Figure 3 shows the
input signal and the demodulated data output after the
wake-up filter is matched. The demodulated output of
the correct (wanted) input signal wakes up the digital
section, and will respond if the command is valid.
Figure 4 shows the case when the input does not meet
the programmed filter requirement. The demodulated
output is not available at the output pin since the input
does not meet the programmed filter requirement. This
ensures that the digital section will not wake-up due to
unwanted input signals.
© 2007 Microchip Technology Inc.
OEH
: 2 ms, T
OEL
PP
= 2 ms).
with a