GV200 User Manual
Speaker output characteristics
Table 15: The Characteristics of Speaker
Parameter
Conditions
Min
Typ Max Unit
Load Resistance
8
Ohm
Differential output level (peak to
peak)
0
8.8
V
Rms Output Power
Vp = 4.4V, RL = 8 OHM
THD + N < 0.1%
900
mW
3.6.
UART Interface
There are two UART interfaces on GV200 which are named as UART1 and UART2. UART1
is used for configuration and firmware downloading. UART2 is used to communicate with
external devices like CAN Bus module and RFID reader. PIN 13 is a control signal which is
named as data terminal ready (DTR). When the GV200 is sleeping, a high level on DTR will
wake up UARTs of GV200.
Please note the UART interfaces are all RS232 level. For RS232 level, valid signals are plus
or minus 3V to 15V and the -3V to +3V is not a valid level. 3V to 15V correspond with logic
0 of TTL level, -3V to -15V correspond with logic 1.
The example connections of UART1 with female DB-9 and UART2 with external devices are
showed as follow.
Figure 19: The connection of UART1 with female DB-9
TRACGV200UM001
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