User Manual

www.veear.eu
10 EasyVR 3 User Manual (1.0.14)
These are applicable to pin RX_P.
Symbol
Parameter
Min
Typ
Max
Unit
V
OH
Output High Voltage (I
OH
= -5 mA)
2.4
3.0
V
V
OL
Output Low Voltage (I
OL
= 8 mA)
0.0
0.6
V
These are applicable to pins IO1 – IO6.
Symbol
Parameter
Min
Typ
Max
Unit
V
IH
Input High Voltage
2.4
3.0
3.3
V
V
IL
Input Low Voltage
-0.1
0.0
0.75
V
I
IL
Input Leakage Current (0 < V
I
< 3V, Hi-Z Input)
<1
10
µA
R
PU
Pull-up Resistance
Strong
10
kΩ
Weak
200
kΩ
V
OH
Output High Voltage (I
OH
= -5 mA)
2.4
3.0
V
V
OL
Output Low Voltage (I
OL
= 8 mA)
0.0
0.6
V
Serial Interface
The EasyVR 3 communicates via an asynchronous serial interface (commonly known as UART interface),
with the following features:
 Baud Rate: 9600 (default), 19200, 38700, 57600, 115200
 Frame: 8 Data bits, No parity, 1 Stop bit
The receiver input data line is RX, while the transmitter output data line is TX. No handshake lines are
used.
Example of a serial data frame representing character “A” (decimal 65 or hexadecimal 41):
VCC
Idle
Start
1
0
0
0
0
0
1
0
Stop
Idle
0V
See also chapter Communication Protocol later on this manual for communication details.