3BSE018741R15| ABB | RF OUTPUT module

Description

3BSE018741R15| ABB | RF OUTPUT module

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A 3BSE018741R15 ended antenna can also be connected to nRF0433 using an 8:1 RF transformer, operating at 433MHz. The primary side of the RF transformer must have a central tap for VDD power supply. Set the output power of resistor R3 connected between RF-PWR (pin 11) and+5V. The RF output power can be set to+10dBm. The relationship between output power, chip current consumption, and resistance R3 (load impedance 400 Ω). Pins FILT (pin 4) and FILT2 (pin 3) are externally connected to a PLL loop filter. The PLL loop filter is an externally connected single ended second-order filter, and for VCO circuits, an external 22nH (433MHz) inductance between the VCO1 (pin 5) and VCO2 (pin 6) pins is necessary. The maximum error of using high-quality chip inductors is ± 3%. The crystal 3BSE018741R15 needs to be externally connected to the crystal oscillator through pins XC1 (pin 1) and XC2 (pin 20). The characteristic requirements of the crystal oscillator are: parallel resonance frequency f=41000MHz, parallel equivalent capacitance Co=5pF, crystal oscillator equivalent series resistance R=150 Ω, all load capacitors, including printed circuit board capacitance CL=14pF, nRF0433 can use the crystal oscillator of the microcontroller.

The 3BSE018741R15 device adopts 220V AC power supply, and the power module directly adopts a stable branded switch power supply. The switch power supply outputs 5V voltage to meet the power requirements of the weak current section on the board. The weak current part consists of three parts: a core board, an expansion board, and an RS485 interface board. These three power supplies are designed independently and isolated from each other, avoiding mutual interference.

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