topic Minimum VDD for USB device in Kinetis Microcontrollers

Minimum VDD for USB device

jh0 — Mon, 18 Sep 2017 11:33:20 GMT

What is minimum voltage for MKL27Z64VLH4 (or similar M0+) to work as USB device? Is it possible to use it as 1.8V like on attached picture?

If I understood right, during working as crystalless USB device, internal precise 48 MHz clock can be used also as source for master (or for other peripherals) clock.

I found FlexIO AN for UART, I2C, SPI, PWM. Is there any FlexIO SWD (master) open source example?

Re: Minimum VDD for USB device

miduo — Thu, 21 Sep 2017 08:53:41 GMT

Hi,

yes, the internal USB regulator powers the USB transceiver or the MCU itself (depending on the application). 
in this case the supply voltage for chip could be 1.8V.

Re: Minimum VDD for USB device

bobpaddock — Thu, 21 Sep 2017 17:20:26 GMT

If communicating via USB the minimum voltage per the standard is 4.2V for VBus.

http://www.usb.org/developers/docs/whitepapers/power_delivery_motherboards.pdf

I know you said Device, understating the Host end is important as well.

http://www.usb.org/developers/compliance/electrical_tests/USB_2_0_Electrical_Compliance_Specification.pdf

See http://www.usb.org for others.