Koheron Alpha250, User Manual

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The micro SD card is connected to the
SD0
PS core via a level-shifter. The SD card I/Os are ESD protected.
Expansion connector
Alpha250 expansion connector
It contains:
Power supplies. 12 V from external supply. 5 V up to 1 A (shared with USB 2.0 connector). + 3.3 V up to 800 mA, sequenced with
I/Os supply. - 3.3 V up to 500 mA.
A dedicated I2C bus
I2C1
with interrupt.
16 single ended or 8 differential I/Os
EXP_IOx
. They are connected to the FPGA Bank 35. Voltage level is 3.3 V. All I/Os are ESD
protected. Warning: These pins are connected directly to the Zynq SoC and must be driven from
VCCIO_3V3
both for voltage
compliance and power sequencing. Applying non compliant voltages on these pins may result in SoC failure.
Two LVDS clocks from the clocking subsystem
EXP_CLK0
and
EXP_CLK1
.
4 user IOs from the GPIO expander
USER_IOx
. Voltage level is 3.3 V. They can be con gured as inputs or outputs, open-drain or
pull-up. These I/Os have 22
Ω
series protection resistors. They are ESD protected.
A 2.5 V voltage reference. This reference acts as a ratiometric tracking with the reference used for all the data converters (RF
ADC, RF DAC, precision ADC, precision DAC). It delivers up to 150 mA (Care must be taken with the voltage drop in track
resistance at large currents).
4 precision ADC inputs. Differential inputs to the precision 24-bit ADC.