Product Card

Table Of Contents

Circuit Description

Brand Model Number Version

V1.0

KCC620 adopts GSM communication system as main design; its circuit mainly consists of the following 5 parts

1: BASEBAND (baseband, powe

supply, logic control)

2: GSM_RF TRANSCEIVER

3: AUDIAO_USB_INTERFACE

4: SIM_MEMORY

The description for each part is as follows,

1. BASEBAND (baseband, power supply, logic control)

Baseband mainly contains main control chip SC6531E and charging chip. SC6531E is an extensively high-degree

integrated chip provided by MTK，which integrates system control, power management, GSM system controller, A-D

signal processing, audio signal input/output control, mic signal input/output control, LCD display driver, memory

interface, USB, UART interface, Bluetooth control interface, system clock(32.768khz) and logic control.

2. GSM_RF TRANSCEIVER

GSM_RF TRANSCEIVER is a quad-band transceiver (GSM850\900\DCS1800\PCS1900MHZ).

It contains transceiver chip, RF PA moduleSC2631H ,SAW (GSM850\900\DCS1800\PCS1900MHZ), 26MHz crystal

and antenna. The power is supplied to VDD\VRF by VBAT and SC6531E.

The transceiver is mainly controlled by SC6531E, which supply GSM operating time base, sig nal processing and logic

control.

While receiving the signal, GSM antenna receives signal from base station, and then transmit it to SAW filter. After

amplifying , the signal detected will be sent to MT6261 for processing and then to D\A converter, f inally it will be

amplified t o drive earphone o r speaker.

While tra nsmitting the signal, SC6531E send command to transceiver by I\Q interface, and then the data will be

processed according to GSM regulations. RF signal will be amplified to 0~2dBM and then to 30~32DBM. Finally it

will send signal to ba se st atio n by GSM antenna, then the whole process is completed.

3. AUDIAO_USB_INTERFACE

Audio signal is output from SC6531E. And then it will be sent to speaker or headphone.

USB f unction is reserved in this board.

UART in terface is used for d ownloading and calibration. This model does n ot provide UART c able. And all functions

will be accomplished internally in SC6531E.

4. SIM_MEMORY

SIM circuit consists of SIM socket and SC6531E. Insert SIM card, the card type and network selection will be auto

recognized.

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Circuit Description Brand Model Number Version V1.0 KCC620 adopts GSM communication system as main design; its circuit mainly consists of the following 5 parts 1: BASEBAND (baseband, power supply, logic control) 2: GSM_RF TRANSCEIVER 3: AUDIAO_USB_INTERFACE 4: SIM_MEMORY The description for each part is as follows, 1. BASEBAND (baseband, power supply, logic control) Baseband mainly contains main control chip SC6531E and charging chip.
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FCC Statement 1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. 2. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.