Serial port design process
serial connector pinout - http://www.hardwarebook.info/Serial_(PC_9)
Hardware Design Considerations
microcontroller pinout - UART related:
taken from page 54, datasheet for microcontroller
Drivers' datasheet suggests that for different Vcc values different capasitors are needed. Will go for simpler solution ang pick 1uF capasitors - 3.3 Vcc values.
Page 2 of drivers' datasheet suggests also that outputs of line driver and receiver are inverted inputs.
Input voltage range, VI
Drivers −0.3 V to 6 V Receivers −25 V to 25 V
Output voltage range, VO:
Drivers −13.2 V to 13.2 V Receivers −0.3 V to VCC + 0.3 V
problem: size of the pins 0.63 mm??
10.10
- Found out that 100 nF capasitor is already present in project and is used inside the power-supply circuit. Removed the capasitor from components and added a line to resistors and capasitors.
- The component used in power-supply circuit comes from miscallenous-devices library. Investigating on whether the footprint is right.
- when one opens component properties in altium by double-clicking on the capasitor component, then clicks on "edit" after choosing the footprint, it says "footprint not fount"
- Turns out the problem was caused by using altium designer 09 instead of AD 13
- Remains to be checked whether capasitors and resistors that were ordered are fit the footprints from misc_devices.lib