Datasheet > BC2502A

BC2502A

更新时间： 2024-03-03 10:10:46

品牌	Logo	应用领域
台湾合泰/盛群 - HOLTEK		/
页数	文件大小	规格书
14页	623K
描述
Sub-1GHz Low-IF FSK RF Receiver

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中文翻译

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BC2502A 数据手册

BC2502A/BC2502B

Power on Reset Characteristics

Ta=25°C

Symbol

V_POR

Parameter

Conditions

Min.

—

Typ. Max. Unit

V_DDStart Voltage to Ensure Power-on Reset

V_DDRising Rate to Ensure Power-on Reset

—

100

—

RR_POR

0.035

V/ms

Minimum Time for V_DDStays at V_PORto

Ensure Power-on Reset

t_POR

—

V_DD

t_POR

RR_POR

V_POR

Time

Operation Modes

Functional Description

The devices provide four operation modes, power oﬀ

mode, deep sleep mode, RX mode and conﬁguration

mode.

The BC2502x devices are ultra-low power, high

performance, low-cost 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 a FSK demodulator and

a fractional-N synthesizer. They only require a crystal

and a minimum number of passive components to

implement a FSK receiver.

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.

FSK RF Receiver

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.

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.

CFOMSD=1 & I²C stop

Configuration

Mode

DO/SDA = Low, then

SD/SCL H → L

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.

Power Off

Deep Sleep

DO/SDA = High, then

SD/SCL H → L

RX Mode

The FSK one/zero type data is generated by

comparing the RSSI signal to a manipulated threshold.

This threshold is crucial to the performance of

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.

SD/SCL L → H

Operation Mode Switching

Note: The CFOMSD bit will be cleared to zero

automatically when the device leaves the

conﬁguration mode.

Rev. 1.20

December 05, 2022

1 2 3 456 7 8...14

中文翻译

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与BC2502A相关器件

型号	品牌	获取价格	描述	数据表
BC2502B	HOLTEK	获取价格	Sub-1GHz Low-IF FSK RF Receiver
BC2502C	HOLTEK	获取价格	Sub-1GHz Low-IF OOK/FSK RF Receiver
BC2502D	HOLTEK	获取价格	Sub-1GHz Low-IF OOK/FSK RF Receiver
BC250A	TDK	获取价格	Transistor
BC250B	TDK	获取价格	Transistor
BC250C	TDK	获取价格	Transistor
BC251	MOTOROLA	获取价格	AMPLIFIER TRANSISTORS PNP SILICON
BC25111R-430-J	YAGEO	获取价格	Single Phase EMI Filter,
BC2511IR-430-J	YAGEO	获取价格	General Purpose Inductor, 43uH, 1 Element,
BC251A	MOTOROLA	获取价格	AMPLIFIER TRANSISTORS PNP SILICON

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