9 Onboard Memories
The GIGA R1 WiFi supplements the 2 MB Flash and 1 MB SRAM on the STM32H747 (U1) with 16 MB of NOR Flash
with the AT25SF128A-MHB-T (U8) as well as 8 MB of SDRAM with the AS4C4M16SA (U3). U8 connects over a Quad-
SPI interface to the main processor (U1). U3 operates at a frequency of 166 MHz.
10 USB Connector
Two USB ports are provided on the Arduino GIGA R1 WiFi. One USB 2.0 type A (J2) and a USB-C® (J12). The USB 2.0
connector allows external devices to be connected as peripherals, while the USB-C® connector allows the GIGA
board to be connected as a peripheral for other devices. Note that super speed pins on the USB-C® connector (J12)
are unpopulated. A TVS diode array is placed on the VBUS of each connector (D4, D2) for ESD protection purposes.
11 Audio
The STM32H7 (U1) has two digital-to-analog converters (DAC) which drive the stereo audio output on the 3.5 mm
jack connector (J15). Each DAC has a resolution of up to 12 bits. The right and left channels are also accessible via
pins DAC0 and DAC1 respectively. A microphone input is also present on the jack connector (J15), which is shared
with analog pin A7. The Buffered mode in the STM32H7 can allow for low-impedance output while Sample and hold
functionality can help to reduce power consumption. Up to 10 mega samples per second are supported.
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