User Manual

Figure 10 VREFIO reference. []
In Figure 11, IC16 limits the in-rush current when the device is connected to the USB port. INA214 is a current shunt amplifier, with a
gain of 100. With Vref = 0.75V and R163 = 15mΩ, the output voltage is:
The VBUS voltage is halved to VSNS_VBUS, for being also monitored. IC12 in Figure 11 is a triple power supply, generating the rails of
1.2V for the FPGA core, 1.5V for Bank 3 and DDR3 memory and 3.3V, for various circuits.
Figure 11 VBUS monitoring. []
4. Power supplies and control
4.1 Internal power supplies
V
ISNS _ V BUS
= 100 ∙ ( V
IN +
− V
IN −
) + 0.75 V = 1.5 ∙ I
V U 5 V 0
+ 0.75 V (2)