Hardware Guide

FIBOCOM MC610 Series Hardware Guide 49/71

of interference, which will greatly improve the coupling TDD noise. 33 pF capacitor is used to filter high

frequency interference when the module is working at 900 MHz, and 10 pF capacitor is used to filter high

frequency interference when working at 1,800 MHz. If the capacitor is not added, TDD noise may be

heard during a call. It should be noted that since the capacitor resonance point largely depends on the

capacitor material and manufacturing process, when choosing a capacitor, it is recommended to consult

the capacitor supplier and choose the most suitable capacitance to filter out the high-frequency noise

when working in EGSM900/DCS1800.

The severity of high frequency interference during GSM transmission usually depends on the customer's

application design. In some cases, the TDD noise of EGSM900 is more serious, and in some cases, the

TDD noise of DCS1800 is more serious. Therefore, customers can choose the required filter capacitor

according to the test results.

The RF filter capacitor on the PCB board should be placed as close as possible to the audio device or

audio interface, and the route should be as short as possible, and must be passed through the filter

capacitor to other connection points. The antenna position should be as far away as possible from audio

components and audio routes to reduce radiation interference. The power lines and audio lines should

not be parallel, and the power lines should be as far away as possible from the audio lines. Differential

audio routes must follow the wiring rules for differential signals.

3.11 Camera Interface

MC610 supports two camera interfaces, SPI and MIPI.

The following table describes the pin description of the CAMERA interface:

Table 3-23 CAMERA interface

Pin name

I/O

Description

CAM_REFCLK

CAMERA CLK signal

CAM_PWDN

CAMERA POWER DOWN signal

CSI_D0N

I/O

CAMERA MIPI data D0 negative terminal;

CAM_SI1 SPI CAM serial data signal 1