Title: 3V SPI/I2C voltage translation [Print This Page] Author: Konrad.Z Time: 1/31/2018 15:59 Title: 3V SPI/I2C voltage translation I want to connect my MCU that run on 3.3V with your board via SPI and I2C, but FireFly voltage level on these buses is 3V. Will I need voltage translation or will it be on spec with FireFly ?
Author: leung先森 Time: 1/31/2018 17:00
Basiclly, 3.3v is the same as 3v .
But if your MCU is serious about voltage controled, just try apply 3v to your MCU.
I trust your MCU have its Float voltage.Author: Konrad.Z Time: 1/31/2018 19:46
Ok, thanks.Author: big_whit Time: 2/5/2018 03:13
Does anyone actually knows if the RK3399 VDDIOs bank @3.0V are Voltage tolerant to VDD+0.3V . Trying to find the information in the RK3399 datasheet but can't find anything.
As per the RK3399 carrier board schematic - the UART2DBG_RX net it directly tied to a 3.3V pullup and the IO bank is set to 3.0V. Any long term issue with this ?Author: leung先森 Time: 2/5/2018 09:35
big_whit Posted at 2/5/2018 03:13
Does anyone actually knows if the RK3399 VDDIOs bank @3.0V are Voltage tolerant to VDD+0.3V . Trying ...
u can try to set up the group gpio of the UART2DBG_RX from the hardware datasheet.
It is controled by pmu.
Welcome Firefly Open Source Community (https://bbs.t-firefly.com/)