User's Manual

Bluetooth Transmit Data Module
Shanghai Ehong Technologies Inc
3. Power Supply
The module accepts a 3.3V DC power input. Power supply should guarantee good ripple
suppression and enough current.
.
4. 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 reset and is internally filtered using the internal low frequency
clock oscillator. A reset 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.
Pin Name / Group Pin Status on Reset
PIOs Input with weak pull-down
AIOs Output, driving low
PCM_OUT Tristated with weak pull-down
PCM_IN Input with weak pull-down
PCM_SYNC Input with weak pull-down
PCM_CLK PD
UART_TX Output tristated with weak pull-up
UART_RX Input with weak pull-down
UART_RTS Output tristaed with weak pull-up
UART_CTS Input with weak pull-down
USB_DP Input with weak pull-down
USB_DN Input with weak pull-down
SPI_CSB Input with weak pull-up
SPI_CLK Input with weak pull-down
SPI_MOSI Input with weak pull-down
SPI_MISO Tristated with weak pull-down
RESETB Input with weak pull-up
Table 7: Pin Status on Reset
5.
The module integrates a Meander line PCB chip antenna so there’s no need to use antenna on
customer’s PCB.
Antenna