Specifications

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NOTE: SSP port #1 is also routed to the onboard LCD panel connector in order to control
the TD035STEE1 LCD module. Thus, this port may only be used when the TD035STEE1
LCD module is not required.
EM-X270
Name
PXA270
Name
Type Description
SSP1_TXD SSP1_TXD_GPIO_57 Output Transmit data serialized data line
SSP1_RXD SSP1_RXD_GPIO_26 Input Receive data serialized data line
SSP1_CLK SSP1_CLK_GPIO_23 I/O Serial bit-clock to control the
timing of a transfer
SSP1_FRM SSP1_FRM_GPIO_24 I/O Serial frame signal
All signals have 3V levels
I2C
The I2C is a serial bus with a two-pin interface. The data pin is used for input and output
functions and the clock pin is used to control and reference the I2C bus. The I2C unit
allows the processor to serve as a master and slave device that resides on the I2C bus.
The PXA270 standard I2C bus is routed to the extender board connector. All signals have
3V levels.
EM-X270
Name
PXA270
Name
Type Description
SDA SDA_GPIO_118 I/O I2C serial data/address signal
SCL SCL_GPIO_117 I/O I2C serial clock line signal
Power Signals
The DC_VBAT line is connected directly to the EM-X270 main battery positive terminal.
Thus, two power supply options exist:
1) The device is supplied from the main battery pack and the extender board circuit is
supplied through the DC_VBAT lines.
2) The EM-X270 battery is not used. The extender board features a power supply circuit
that provides regulated 3.7V – 4V on the DC_VBAT lines and supplies the EM-X270
through the extender board connector. A reference design for such a power supply
system is available in the schematics of the EB-X270.