Ehong EH-MB18, Manual

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Bluetooth Audio Module
Ehong Technology Co., Ltd
internal pull-down
10 PCM_SYNC
Bi-directional with weak
internal pull-down
Synchronous Data Sync
11 PCM_OUT
CMOS output, tri-state,
with weak internal pull-
down
Synchronous Data Output
12 RESETB
CMOS input with weak
internal pull-up
Active LOW RESETB, input
debounced so must be low for >5ms
to cause a RESETB
13 UART_CTS
Bi-directional with weak
pull down
Uart clear to send ,active low
14 UART_RTS
Bi-directional with weak
internal pull-up
uart request to send ,active low
15 UART_RX
CMOS input with weak
internal pull-down
UART data input
16 UART_TX
Bi-directional CMOS
output, tri-state, with weak
internal pull-up
UART data output
17 USB_D+ Bi-directional
USB data plus with selectable
internal 1.5K pull up resistor
18 USB_D- Bi-directional USB data minus
19 PIO0
Bi-directional with
programmable strength
internal pull-up/down
Programmable input/output line
20 SPI_CSB
Input with weak internal
pull-up
Chip select for Synchronous Serial
Interface for programming only,
active low
21 SPI_MISO
CMOS output, tri-state,
with weak internal pull-
down
Serial Peripheral Interface output for
programming only
22 SPI_MOSI
CMOS input, with weak
internal pull-down Serial Peripheral Interface input for
programming only
23 SPI_CLK
Input with weak internal
pull-down Serial Peripheral interface clock for
programming only
24 LED2 Open drain output LED Driver
25 LED1 Open drain output LED Driver
26 LED0 Open drain output LED Driver
27 PIO6
Bi-directional with
programmable strength
internal pull-up/down
Programmable input/output line
28 PIO7
Bi-directional with
programmable strength
Programmable input/output line or
I2C SDA