Differences

This shows you the differences between two versions of the page.

--- web-u2 [2019/09/09 10:56] – add WITRN U2 V2.0 kingkevin
+++ web-u2 [2019/09/09 13:29] – add chips kingkevin
@@ Line 1: / Line 1: @@
 The U2 is a USB power meter and tester.
+{{:u2:qway-u2p_device_front.jpg?0x200|}}
+{{:u2:qway-u2p_device_back.jpg?0x200|}}
 ===== Overview =====
@@ Line 32: / Line 35: @@
   * [[http://www.witrn.com/witrn/u2/U2_Firmware.zip|Firmware]]
-There is also this thorough [[https://mysku.ru/blog/aliexpress/67123.html|review]] with a lot of information in the comments.
+There is also this thorough [[https://diykitsblog.com/obzory-i-testy/u2-usb-tester-witrn.html|review]] and [[https://mysku.ru/blog/aliexpress/67123.html|another]] with a lot of information in the comments.
 ===== Hardware =====
@@ Line 75: / Line 78: @@
 {{:u2:witrn-u2_board-top_back.jpg?0x150|}}
+==== Qway U2p ====
+The U2p version is a variant of the U2 with 4 button instead of 2, and a switch to enable Power Delivery probing
+{{:u2:qway-u2p_device_front.jpg?0x200|}}
+{{:u2:qway-u2p_device_back.jpg?0x200|}}
+{{:u2:qway-u2p_middle_back.jpg?0x200|}}
+Finally it was also possible to get a version with Bluetooth and some light next to the USB input (not sure when it is on though)
+{{:u2:qway-u2p_bottom_front.jpg?0x150|}}
+{{:u2:qway-u2p_top_back.jpg?0x150|}}
+==== Board ====
+{{:u2:qway-u2p_middle_back.jpg?0x200|}}
+{{:u2:qway-u2p_ics.jpg?0x200|}}
+Here a list of the components present on the Qway U2p V1.1 board:
+  - input USB 3.0 type A plug
+  - input USB type C socket
+  - input USB type micro-B socket
+  - output USB 3.0 type A socket
+  - output USB type C socket
+  - data USB type micro-B socket, USB HID connection to the computer to read the measurements and flash the firmware
+  - 4 button to interact with the interface (back, ok, previous, next)
+  - PD switch to enable USB-C Power Delivery triggering
+  - [[http://www.microne.com.cn/en/ProductDetail.aspx?id=29|Micro One ME6203]] 3.3V LDO voltage regulator: one for the USB type A input, the other for the USB HID micro-B input to not affect the measurements
+  - input diode protection: not in-line, but shorting GND to VBUS when GND > VBUS
+  - R012F shunt resistor (12 mOhm): to measure the current
+  - 5R10 shunt resistor (5.1 Ohm): which can be switched in line to measure low currents
+  - [[https://www.onsemi.com/products/interfaces/usb-type-c/fusb302|ON FUSB302]] (marked PBAB) Programmable USB Type-C Controller with PD: this gets enabled by the PD switch
+  - [[https://www.ti.com/product/INA226|TI INA226]] current and power monitor: this makes the measurements
+  - [[https://www.nxp.com/docs/en/data-sheet/MMA8452Q.pdf|NXP MMA8452Q]] accelerometer: to automatically rotate the display
+  - [[https://www.fujitsu.com/downloads/MICRO/fsa/pdf/products/memory/fram/MB85RC16-DS501-00001-8v0-E.pdf|Fujitsu MB85RC16]] I²C FRAM: to store the settings and energy measurements
+  - [[https://www.st.com/en/microcontrollers-microprocessors/stm32f072cb.html|ST STM32F072CBT6]] ARM Cortex-M0 micro-controller: the brain of the device
 ===== Software =====