Warm Reminder：

1. The module foot position is relatively dense, so a good welding machine foundation is needed. The module is tested before delivery and will not be returned after tin loading!

2. Bluetooth datasheet and schematic diagram. can be offered.

3. The actual pin pin pin corresponding to the PIO port needs to check the datasheet by yourself!

Serial interfaces: UART, Bit Serializer (I²C/SPI),USB 2.0l Integrated PMU: Dual SMPS for system/digital circuits, Integrated Liion battery chargerApplication subsysteml Dual core application subsystem 32 MHz operationl 32-bit Firmware Processor: Reserved for system useRuns Bluetooth upper stack, profiles, house-keeping codel 32-bit Developer Processor:Runs developer applicationsl Both cores execute code from external flash memory using QSPIclocked at 32 MHzl On-chip caches per core allow for optimized performanceand power consumptionBluetooth subsysteml Qualified to Bluetooth v5.0 specification including 2 Mbps Bluetoothlow energy (Production parts)l Single ended antenna connection with on-chip balun and Tx/Rx switchl Bluetooth, Bluetooth low energy, and mixed topologies supportedl Class 1 supportDefault firmware:

1. Support sbc, aac, aptx, aptx-HD decoding, no call function, optional I2S, analog output

2. Key Instructions:

< SYS_ CTRL: Turn on at high level, turn off at low level, turn on and enter pairing mode automatically

PIO2: Short press play pauses, long press 3 seconds to enter pairing, long press 5 seconds to clear pairing records

PIO3: Short press previous song, long press volume to decrease

PIO4: Short press next song, long press volume to increase

PIO5: High level connected, no low level connected

PIO19: Audio output high level, no audio low level

< PIO20: SPDIF Output Port

3. Indicator description:

Bluetooth not connected: LED 0 LED 1 alternating flash

Bluetooth connected: LED 1 stays on

Bluetooth audio playback: LED 1 is always bright

Note: The USB sound card must be connected with four cables of the module, USBDP, USBDN, VCHG, GND