BC2502C/BC2502D
Functional Description
CFOMSD=1 & I2C stop
Configuration
Mode
The BC2502x devices are ultra-low power, high
performance, low-cost OOK/FSK receivers suitable
for use in wireless applications with a frequency of
315, 433, 868, 915MHz respectively. The devices are
formed by a low-IF receiver, followed by an OOK/FSK
demodulator and a fractional-N synthesizer. They only
require a crystal and a minimum number of passive
components to implement an OOK/FSK receiver.
DO/SDA=Low, then
SD/SCL H → L
Deep Sleep
Power Off
DO/SDA=High, then
SD/SCL H → L
OOK/FSK RF Receiver
RX
Mode
SD/SCL L → H
The BC2502x devices adopt a fully-integrated, low-
IF receiver architecture. The received RF signal is first
amplified by a low noise amplifier (LNA), after which
the frequency is reduced to an intermediate frequency
(IF). The IF signal is filtered by a channel-selected filter
which rejects the unwanted out-of-band interference
signals and image signal. After the BPF stage, the
desired IF signal is amplified by the limiter amplifier
which generates a received-signal-strength-indicator
(RSSI) signal.
Operation Mode Switching
Note: The CFOMSD bit will be cleared to zero
automatically when the device leaves the
configuration mode.
Auto RX Mode
The devices provide an Auto RX Mode. After power-
on, the devices will enter the RX mode after a
30ms delay from the power-on reset. In this mode,
frequency selection is achieved using a pin option
together with external PCB wirings as shown in the
following table.
The devices feature an automatic gain control (AGC)
unit which adjusts the front-end gain according to
the RSSI. The AGC can increase the dynamic range
of the RSSI and enable the devices to receive a wide
dynamic range RF signal.
FREQ Selected Frequency Selected Frequency
Pin
for BC2502C
for BC2502D
The OOK/FSK one/zero type data is generated by
comparing the RSSI signal to a manipulated threshold.
This threshold is crucial to the performance of
OOK/FSK demodulation. The agile threshold detection
mechanism can reduce glitches when there is no RF
signal or when long zero data streams are received. It
also includes a fast tracking threshold to offer good
immunity from co-channel interferences.
GND
315MHz
315MHz
Floating
433.92MHz
Unavailable
433.92MHz
868.35MHz
DD
V
To directly enter this mode, the SD/SCL pin should
be connected to ground and the FREQ pin should
be connected to the required level before power is
applied. Note that there is only one method for the
device to leave the RX mode which is to remove the
power.
Operating Mode
The devices provide four operation modes, power off
mode, deep sleep mode, RX mode and configuration
mode.
Sniff RX Mode
The devices also provide a Sniff RX mode as it is
controlled by an MCU. The SD/SCL pin defaults
to a pull-high state. After power-on the devices will
enter the deep sleep mode. An MCU could control the
SD/SCL pin to make it enter or leave the RX mode.
With additional SD/SCL control, users can optimize
the average power consumption based on their
applications.
In the deep sleep mode, there is less than 1µA of sleep
mode leakage current with register data retention.
In the RX Mode, the devices execute normal RX
operations that receive incoming RF signals from the
antenna and then output the demodulated data onto the
DO/SDA pin. There are two types of RX mode, one is
the Auto RX mode and the other is the sniff RX mode.
It is not recommended to use the sniff RX mode if the
frequence is less than or equal to 5ksps.
In the Configuration Mode, the devices are operated
as I2C slaves and are programmed by an external
MCU. Users can select the desired RX channel
by configuring the internal registers. After the
configuration has completed, the devices will return to
the deep sleep mode by setting the CFOMSD bit high.
Rev. 1.00
6
October 16 2023
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