Sub-1G OOK RF Control for Electric Bike Alarm BC48R2020 / BC9821 + HT45F56-1 RF Characteristics Frequency : 433MHz Supply voltage ◆ ◆ Tx : 3V Rx : 36V Modulation : OOK Tx : BC48R2020 ◆ Remote functions : arm, disarm, remote start, remote calling ◆ Output power : 9.5dBm ◆ Transmission current consumption : 9.8mA (with LED) Rx : BC9821 ◆ ◆ Receiver sensitivity : -100dBm @ 5V 10Kbps 0.1%BER Receiving current consumption : 2.6mA (no alarm) Shock sensor controller : HT45F56-1 ◆ shock detection − wheel phase detection BC9821 BC48R2020 HT45F56‐1 HT7463B Application Areas Block Diagram Application Circuit U1 3V D1 C13 10uF BT1 3V 2 LED C1 8pF(3.5pF) C4 12pF(10pF) C2 12pF(10pF) R2 2.2K 1 KA R1 1K 1 2 S2 3 S3 4 S4 5 6 7 C3 8pF(3.5pF) 8 PC3/DOUT PA4 PA3 PA5 PA2/INT PA6/PFD PA1/TMR0 PA7/RES PA0 VDD VSS XOUT AVSS PAOUT XIN AVDD 16 15 S1 14 13 3V 12 11 10 9.8437MHz(13.56MHz) Y1 3V 9 C5 15(18)pF BC48R2020 C8 150pF L1 47nH C10 15pF(6.8pF) 18pF(3.9pF) C7 L2 150nH C11 5.6pF(0.5pF) R3 C12 100pF 0R C9 0.1uF RF Receiver C6 15(18)pF