IPS2200 datasheet(11/35 Pages) RENESAS

11 / 35 page

IPS2200 Datasheet

Jan.19.21

Page 11

CSN_IRQN

TX1

TX2

VDD

SCK_SCL

SIO_SDA

GND

CVD

VDDA

CVA

RX1

RX2

(sin)

RX3

RX4

(cos)

SIN

SINN

COS

COSN

3.3V / 5V

CT2

CT1

Configuration with split capacitors CT1 and CT2 for

improved EMC performance. Both capacitors must

have the same capacitance.

The oscillator frequency is determined by the values of

coil L and capacitors CT1 and CT2:

�� =

2��√

��∗��1∗��2

��1+��2

 for CT1 = CT2 :

�� =

2��√��

��1

Where:

fTX = Oscillator frequency in MHz

L = Coil impedance in µHenry

CT1, CT2 = Capacitance in µFarad

Figure 3. LC Oscillator Connection with Split TX Capacitors

The equivalent parallel resistance RPeq of the LC oscillator can be calculated using Equation 2:

RPeq =

Equation 1

RS =

RPeq

Where

RPeq Equivalent parallel resistance of the LC oscillator.

Serial resistance of the transmitter coil at the transmitter frequency.

Coil reactance at the resonant frequency.

Capacitance of the parallel capacitor CT.

Note that the capacitor losses are not included in the equation.

Equation 2

RPeq

Figure 4. Parallel Resonator Circuit

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