Edited by abomin3v3l at Wed May 20, 2015 07:02 |
PiTom replied at Mon May 4, 2015 10:19
ACIN = 5V DC Input jack powersupply.
IPSOUT = Intelligent Power Selection Output.
CSI0 is A20's port E. Port E is supplied with 2.8V through VCC-PE (pin E19), so all CSI0 are 2.8V IO's. Is that you need to know?
I did a look on AXP209 datasheet and I understood the following:
ACIN is a 5V input, IPSOUT is a 5V output.
There's an internal switch between ACIN and IPSOUT, controlled by AXP209. When AXP209 is not in reset state, the switch is closed, when AXP209 is in reset state the switch is open. Then, considering the RESET button is constantly pressed, the AXP209 mantain IPSOUT disconnected from ACIN, preventing some peripherals to be power supplied, like the two USB host ports and HDMI 5V pin. This is what I understood reading the datasheet...
But in practice this does not occur, I have only one Banana Pro here now, if I maintain the reset button pressed, the AXP209 continues to supply 5V through IPSOUT and the two USB host ports are supplied with 5V. I would like that IPSOUT stay disconnected from any 5V power supply during a reset.