Commit Graph

13 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
6230e7c55e PCB: updated ATF150X adapter
Previously the TDO pull-up was not properly connected
to VCC. The Rev.2 adapter can still be used, either
without the pull-up or with a small mod-wire to
connect the pull-up with the VCC."
2024-04-13 00:02:44 +01:00
ole00
c205579e9b Gerbers: added ATF150xAS and ATF150xASL adapter 2024-04-03 22:16:46 +01:00
ole00
472bbffce7 PCB design and gerbers: added adapter for GAL26V12
The adapter is based on RomBor's 26V12 adapter for GALmate.
2023-11-21 19:07:19 +00:00
ole00
93bcf40dd0 PCB design v.3.1 - added support for GAL18V10 2023-11-04 12:58:39 +00:00
ole00
325b51d722 added new design gerbers 2023-04-07 19:16:43 +01:00
ole00
7ed84ffa63 removed old design gerbers 2023-04-07 19:16:43 +01:00
ole00
14c4eafc93 added adapter20v8 gerbers archive 2023-01-07 11:27:20 +00:00
ole00
d19f8cc52f new gerbers with R4 pull up resistor 2022-12-16 10:53:24 +00:00
ole00
fc819a54c8 hw 2.1 - 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 14:03:04 +01:00
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
1bb8adb3d5 gerbers for PCB v.2.0
support for 16V8 and 22V10 on the same board
2019-04-09 20:44:18 +01:00
ole00
25b837798e project files 2019-03-16 10:54:24 +00:00