BC2401 Application Guidelines
AN0435E V1.00
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December 11, 2016
BC2401 Application Guidelines
D/N: AN0435E
Introduction
Holtek’s BC2401 is an RF receiver which supports OOK demodulation in the 315MHz and
433.92MHz frequency bands. The device includes fully integrated super regeneration
signal reception technology to achieve the best performance/cost ratio. For product
development convenience, the BC2401 can detect received signals by reading the pin
state directly. The BC2401 can operates with a simple OOK modulation RF transmitter to
develop wireless products, such as wireless transmission controls for home appliances,
computer peripherals and radio controlled toys to name but a few.
As mentioned above, the BC2401 is an RF receiver. Product design engineers, when
using such products for the first time, are often faced with some difficult problems during
product design. Holtek has prepared solutions including some frequently asked questions
based on their past experience to help engineers to quickly understand the RF receiver
operation to overcome these initial problems. This application note will show how to use
the BC2401 using specific examples.
Functional Description
The BC2401 is a super regeneration architecture RF receiver which contains a front-end
receiver and a digital demodulator. The architecture is shown as follows.
LNA
VCO
Quench
Signal
generator
Digit
Demodulator
HIRC
RFIN
L1
L2
DOUT
VDDRF
VSSRF
VDD
VSS
The reception signal frequency can be setup by external reactive components connected
to L1 and L2. The internal oscillator will operate continuously after power-on to provide
frequency for the demodulator. When the signal frequency has been setup by the
components on L1 and L2, the relevant output signal will be generated on the DOUT pin
once the device is powered on.