Any one knows the logic levels of the GPIOs ? (1.5...
# caraveli
Ivan Rodriguez
12/10/2021, 9:01 PMAny one knows the logic levels of the GPIOs ? (1.5V, 3.3V, 5V, etc ...)
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Dinesh A
12/11/2021, 3:55 AM3.3V, In Caravel timing analysis uses below library which means IO: 3.3 and core is 1.8v
./sky130A/libs.ref/sky130_fd_sc_hvl/lib/sky130_fd_sc_hvl__tt_025C_3v30_lv1v80.lib
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Ivan Rodriguez
12/11/2021, 7:59 AMThanks!😀
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Tim Edwards
12/11/2021, 4:59 PMCore is always 1.8V. The external voltage can be anything from 1.8V to 5.5V.
Tim Edwards
12/11/2021, 5:00 PMOn Caravel, the VDDIO pin is what drives the external voltage levels for all of the I/O.
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Ivan Rodriguez
12/11/2021, 7:07 PMThe question is because I want to drive a 3.3V UART port in the GPIOs. So I want to use 3.3V logic
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Tim Edwards
12/11/2021, 11:12 PMAll signals connected to the user side of a GPIO should be running at 1.8V. All I/Os have level shift circuits to convert between the external voltage and the core 1.8V voltage.