Product Info

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VTech Communications LTD.

R&D Department

The document is VTech’s proprietary information, Please do not disclose to third party without VTech’s consent

Ref. No.: 20191009 Version: 01 Date: 09 Oct, 2019 Page 10 of 33

The VTBM-A01 BT Module supports an I²C interface for I/O port expansion. The default assignment of the I²C

interface onto the PIOs on the VTBM-A01 BT Module is:

• PIO [0] is the I²C interface SCL line (AMP_I2C_SCL)

Alternatively, the I²C interface can be assigned to two PIOs from PIO [9:0] using PSKEY_I2C_SCL_PIO and

PSKEY_I2C_SDA_PIO.

NOTE The I²C interface requires external pull-up resistors. Ensure that external pull-up resistors are

suitably sized for the I²C interface speed and PCB track capacitance.

6 Interfaces

6.1 Programmable I/O ports (PIO)

VTBM-A01 BT Module provides up to 14 lines of programmable bidirectional I/O, PIO[0:9,16:18,21 ].

Table 6-1 Alternative PIO functions

Debug SPI UART I²C I²S SPDIF

PIO[0] – UART_RX AMP_I2C_SCL(default) – –

PIO[1] – UART_TX AMP_I2C_SDA(default) – –

PIO[2] SPI_MOSI – Alternate I²C function I2S1_SD_IN SPDIF_IN

PIO[3] SPI_MISO – Alternate I²C function I2S1_SD_OUT –

PIO[4] SPI_CS# – Alternate I²C function I2S1_WS –

PIO[5] SPI_CLK – Alternate I²C function I2S1_SCK –

PIO[6] – – Alternate I²C function I2S2_SD_OUT –

PIO[7] – – Alternate I²C function I2S2_WS –

PIO[8] – UART_RTS Alternate I²C function

I2S2_SD_IN: I2S2

synchronous data

input

–

PIO[9] – UART_CTS Alternate I²C function 2S2_SD_IN

PIO[16] – UART_RTS – – –

PIO[17] –

UART_CTS

– – –

PIO[18] – – – – –

PIO[21] – – – – –

PIO

Function

6.2 Analog I/O ports (AIO)

VTBM-A01 BT Module has one general-purpose analog interface pin, AIO [0]. Typically, this pin connects

to a thermistor for battery pack temperature measurements during charging.

6.3 LED drivers

VTBM-A01 BT Module includes a 3-pad PWM LED driver for driving RGB LEDs for producing a wide

range of colors. All LEDs are controlled by application.