nanoUART

nanoUART. Features

Open source hardware schematic

Features

  • Hardware full duplex, supports up to 6Mbps baud rate communication
  • Support RTS/CTS hardware flow control
  • Support common MODEM communication signals
  • Support a variety of IO levels
  • TYPE-C interface
  • Small Size: 2.2cm X 1.7cm

pins - from top to bottom

front side (pins to the right)

GND
TX
RX
DTR
RTS
3V3

back side (pins to the left)

RI
CTS
DSR
DCD
VREF
5V

Note 1: Provide 5V/3.3V, 5V power supply current up to 500mA, 3.3V output current up to 300mA

Note 2: VREF is the external reference pin level input

voltage is selected by a solder bridge on the back of the nanoUART. My nanoUARTs came with 3.3V selected.

back to microcontrollers page.

Links

Tindie: nanoUART,PMOD-HDMI, Github: nanoUART,

History

2022-07-05: connected to a Debian laptop, the nanoUART shows up as

tingo@z30b:~/work/bitraf/2022$ ll /dev/tty[ACU]*
crw-rw---- 1 root dialout 166, 0 Jul  5 21:37 /dev/ttyACM0

from lsusb output

Bus 001 Device 010: ID 1a86:55d3 QinHeng Electronics USB Single Serial

2022-07-05: when connected to a FreeBSD workstation, the nanoUART shows up like this

tingo@kg-core2:~ $ ll /dev/cuaU* /dev/ttyU*
crw-rw----  1 uucp  dialer  - 0x1ed Jul  5 20:37 /dev/cuaU0
crw-rw----  1 uucp  dialer  - 0x1ee Jul  5 20:37 /dev/cuaU0.init
crw-rw----  1 uucp  dialer  - 0x1ef Jul  5 20:37 /dev/cuaU0.lock
crw-------  1 root  wheel   - 0x1ea Jul  5 20:37 /dev/ttyU0
crw-------  1 root  wheel   - 0x1eb Jul  5 20:37 /dev/ttyU0.init
crw-------  1 root  wheel   - 0x1ec Jul  5 20:37 /dev/ttyU0.lock

from /var/log/messages

Jul  5 20:37:31 kg-core2 kernel: ugen1.6: <vendor 0x1a86 USB Single Serial> at usbus1
Jul  5 20:37:31 kg-core2 kernel: umodem0 on uhub3
Jul  5 20:37:31 kg-core2 kernel: umodem0: <vendor 0x1a86 USB Single Serial, class 2/0, rev 1.10/4.43, addr 5> on usbus1
Jul  5 20:37:31 kg-core2 kernel: umodem0: data interface 1, has no CM over data, has no break

this on

tingo@kg-core2:~ $ freebsd-version -ku
13.0-RELEASE-p11
13.0-RELEASE-p11

2022-07-05: I created this page.

2022-07-05: I found a package note in my mailbox, and picked up the package at PIB Extra Trondheimsveien in the afternoon.

2022-06-13: the package from Tindie shipped.

2022-06-12: I ordered 3 x nanoUART at USD 5.80 each + 1 x PMOD-HDMI at USD 4.80 from Tindie. Shipping was USD 9.-, a total of USD 31.20.