When connecting an ePaper display to the ePaper Adapter Board, some users are seeing the busy line going low and not going high again. Luckily, there’s an easy fix.
Our ePaper Adapter Board CFA10084 is compatible with all our entire CFAP family of ePaper displays, but it does require a minor modification to work with some of our displays. There’s a jumper that can be closed to change the resistance between RESE and GND.
If you leave the jumper open and connect a display that needs it closed, the busy signal may not function as expected. The datasheet of each individual display will indicate whether the resistance between RESE and GND should be 3Ω (jumper open) or 0.47Ω (jumper closed).
We’ve also included the handy table below, though you should always
reference the datasheet!
| Product Number | Product Description | RESE Ω |
| CFAP104212C0-0213 | 2.13” 3-Color ePaper Display (Red) | RESE=0.47Ω / Close Jumper |
| CFAP104212D0-0213 | 2.13” Flexible ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP104212E0-0213 | 2.13” 3-color ePaper Display (Yellow) | RESE=0.47Ω / Close Jumper |
| CFAP122250A0-0213 | 2.13″ ePaper Display, Zero Power | RESE=3Ω / Open Jumper |
| CFAP128296C0-0290 | 2.9” ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP128296D0-0290 | 2.9” 3-Color ePaper Display (Red) | RESE=0.47Ω / Close Jumper |
| CFAP128296E0-0290 | 2.9” 3-Color ePaper Display (Yellow) | RESE=0.47Ω / Close Jumper |
| CFAP152152A0-0154 | 1.54” Square ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP152152B0-0154 | 1.54″ Square 3-Color ePaper Display (Yellow) | RESE=0.47Ω / Close Jumper |
| CFAP152152C0-0154 | 1.54″ Square ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP176264A0-0270 | 2.7” 3-color ePaper Display (Red) | RESE=0.47Ω / Close Jumper |
| CFAP176264B0-0270 | 2.7” ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP200200A0-0154 | 1.54″ Square ePaper Display | RESE=3Ω / Open Jumper |
| CFAP200200A1-0154 | 1.54″ Square ePaper Display | RESE=3Ω / Open Jumper |
| CFAP400300A0-0420 | 4.2″ 3-Color ePaper Display (Red) | RESE=0.47Ω / Close Jumper |
| CFAP400300B0-0420 | 4.2″ ePaper Display | RESE=0.47Ω / Close Jumper |
| CFAP400300C0-0420 | 4.2″ 3-Color ePaper Display (Yellow) | RESE=0.47Ω / Close Jumper |
| CFAP600448A0-0583 | 5.83” ePaper Display | RESE=3Ω / Open Jumper |
| CFAP640384A0-0750 | 7.5″ ePaper Display | RESE=3Ω / Open Jumper |
So, where is this jumper?
Here’s the adapter board with the jumper left open:
Now let’s zoom in to that top right corner.
There it is! Now, let’s see it closed up.
Ready to go!
Still need assistance with your project?
As always, please call, email, or chat with our friendly support team to discuss any issues you’re running into.
Join the discussion on our forum.