Hi guys,
anyone knows any ways of converting PIC uC 5V outputs to 1.8V? I've got a low power SRAM chip (23A640) which works with 1.55-1.95V and I'm trying to get it working in SPI mode with a PIC16f877A. The pins on the device are as follows:
- clock, serial data in (data coming from the PIC) and chip select, all coming from the PIC
- power supply which can come from a 1.8V voltage regulator
- serial data out (going from the SRAM to the PIC)
Currently I'm using simple voltage dividers (360ohm/220ohm) for the PIC outputs and power supply and I'm using a transistor to increase the 1.8V on the serial data out pin to 5V, so the PIC can handle that as well. For some reason this doesn't work as it should, so I'm looking for other ways of making the 5V-1.8V / 1.8V-5V conversion.
Thanks in advance for any help.
Regards,
Tom