Human-Machine Interface (HMI) Protection
Highlights:
- Protection needed for interfaces exposed to human contact
- Pushbuttons
- Keypads
- Touchscreens
- Any other points of frequent contact
- Operating Voltage depends on voltage of data lines (typically 1.8-5V)
- Capacitance is not a huge concern, < 30pF is generally sufficient
- Multi-channel recommended for multiple I/Os for space-saving
- High ESD rating desired to maximize protection from transients
|
TI Products Recommendations |
Working Voltage (V) |
IEC 61000-4-2 ESD Rating (kV) (Contact) |
Capacitance (pF) |
Channel count |
Package Size (mm) |
Package |
|
3.6 |
30 |
0.66 |
1 |
0.6 x 0.3 |
0201 |
|
|
3.6 |
30 |
0.55 |
4 |
2.5 x 1.0 |
DFN2510 |
|
|
5.5 |
30 |
0.5 |
1 |
0.6 x 0.3 |
0201 |
|
|
5.5 |
25 |
1.5 |
2 |
2.1 x 2.0 |
SOT-323 |
|
|
5.5 |
12 |
0.5 |
4 |
2.5 x 1.0 |
DFN2510 |
< Related Documentation>
ESD Protection for Keypads, Pushbuttons, and Side Keys
[FAQ] What TI ESD/TVS Diode Should I Use to Protect Interfaces in My System?
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