User Manual

Bluetooth Audio Module
Ehong Technology Co., Ltd
52
SPK_LP
Analogue
Speaker output positive, left
53
GND
Ground
Ground
Table 8：PIN
Terminal Description
6. Physical Interfaces
6.1. Power Supply
- The module DC3.3V power input.
- Power supply pin connection capacitor to chip and pin as far as possible close
- Capacitor decouples power to the chip
- Capacitor prevents noise coupling back to power plane.
.
Figure 2：Power Supply PCB Design
6.2. Reset
The module may be reset from several sources: RESETB pin, power-on reset, a UART break
character or via software configured watchdog timer.
The RESETB pin is an active low RESETB and is internally filtered using the internal low
frequency clock oscillator. A RESETB will be performed between 1.5 and 4.0ms following
RESETB being active. It is recommended that RESETB be applied for a period greater than
5ms.
At RESETB the digital I/O pins are set to inputs for bi-directional pins and outputs are tri-state.
The pull-down state is shown below.
Pin Name / Group
Pin Status on RESETB
USB_DP
N/a
USB_DN
N/a