Commit Graph

7 Commits

Author SHA1 Message Date
ole00
28d8737780 new PCB design v. 3.2
* Optional voltage booster on the board which can replace
  the mt3608 module. If mt3608 module is used the area on
  the board under the module is left unsoldered.
* Optional SPI RAM for future use to support bigger GALs/CPLDs
  on the UNO board. Not currently used by any GAL.
* Support for 3.3V Arduinos by splitting the 5V power rail and
  IOREF power rail. Very old Arduino UNOs R2 without IOREF
  header pin can use a solder bridge JP1 (marked as Vx on the
  bottom of the board) to join the 5V rail and IOREF power rail.
* HW support for internal AREF which is used to measure VPP.
  There is an extra footprint on the bottom of the board
  to solder another attenuation resistor (R19). For example
  ESP32-S2-Mini based Arduinos with 2.5V internal analog
  reference can use 100k resistor as R19 to reduce the max.
  3V sensing value to 2.5V.
* ZIF18 and ZIF19 connected to the shift register output pins.
  This is for supporting other GALS and CPLDs (via adapter).
* added 100K pull down resitor R18 to ZIF15 (to complement the 10k
  pull-up). This is to ensure the pin is held low when the On
  switch (SW1) is opened. It is used for detection the On switch
  is closed when programming ATF150X via JTAG.
2024-04-26 16:30:47 +01:00
ole00
93bcf40dd0 PCB design v.3.1 - added support for GAL18V10 2023-11-04 12:58:39 +00:00
ole00
97f8ece5af added new design pcb 2023-04-07 19:16:43 +01:00
ole00
4c27435161 removed old pcb design 2023-04-07 19:16:43 +01:00
ole00
e7002ad90c PCB: added pull up resistor to SDOUT 2022-12-15 19:54:13 +00:00
ole00
ba9cd08031 hw 1.2 - added pull down resistor to EN pin
This prevents accidental enablement of VPP during
Arduino reboot. ATF chips interpreted such state
as the Erase command and cleared the fuses.
2019-04-13 13:59:06 +01:00
ole00
25b837798e project files 2019-03-16 10:54:24 +00:00