I'm using an Analog Devices ADM3251E isolated single channel RS232 Line Driver/Receiver which only has RX/TX so I'll need to use the API to initiate downloads as well as reset a ZX-328n.
What should I do with the reset pin? 10K pullup?
Reset with Isolated RS-232
Re: Reset with Isolated RS-232
That sounds about right. There is an internal pullup on the reset line but I think that it is in the high 10's of KOhms. I feel more comfortable with a lower resistance on the reset line so I usually add an external pullup of 10K or so.dlh wrote:What should I do with the reset pin? 10K pullup?
- Don Kinzer
Thanks, Don.
After reading the datasheet and seeing the ADM3251E uses 300MHz for the isolated voltage supply, with a 6-layer PCB recommended to reduce EMI, I decided to go with opto-isolators, for fear the 300MHz will wreak havoc with the 310MHz superregenerative RF receiver onboard the device being modified. I still need to handle reset & d/l with the API as the opto-isolator circuit steals power from DTR.
After reading the datasheet and seeing the ADM3251E uses 300MHz for the isolated voltage supply, with a 6-layer PCB recommended to reduce EMI, I decided to go with opto-isolators, for fear the 300MHz will wreak havoc with the 310MHz superregenerative RF receiver onboard the device being modified. I still need to handle reset & d/l with the API as the opto-isolator circuit steals power from DTR.