Data Sheet

Shenzhen Waytronic Electronics Co., Ltd. WT2003S-16S Chip

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3.3. Control mode

3.3.1.Key control

Key

Corresponding

resistor

Function and operation

short press, play/pause

Short press, next audio

Short press, previous audio

3.3K

Short press, volume up

5.1K

Short press, volume down

10K

Short press, stop playing

3.4. Serial port control

3.4.1.Protocol command format

WT2003S is built in standard UART asynchronous serial interface, which belongs to 3.3V TTL electric

level interface and can be converted to RS232 level through MAX3232 chip.

Communication data format: 1start bit, 8 data bits, no parity bit, and 1 stop bit. Using computer serial

debugging assistant needs to correctly set the serial port parameters, as shown in Figure:

Note: “Length” (number of bytes)= length (1 byte) +command code (several bytes) + parameter (several

bytes) + check sum (1 byte);

Cumulative sum check means the low byte of the cumulative summation of “length+ command code+

parameter”.

Start code

Length

Command code

Parameter

Cumulative sum check

End code

0X7E

See below

0XEF