Holtek BC2401 Application Manuallines

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.
VDDRF
VSSRF
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.
AN0435E V1.00
L2
L1
RFIN LNA
VCO
BC2401 Application Guidelines
VDD
Quench
Digit
Signal
Demodulator
generator
HIRC
1/ 8
VSS
DOUT
December 11, 2016