Datasheet Details
| Part number | CH455 |
|---|---|
| Manufacturer | Unknown Manufacturer |
| File Size | 178.29 KB |
| Description | LED drive and keyboard control chip |
| Datasheet |
 CH455 Datasheet
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General Description
Positive power, the persistent current is no less than 150mA
Public ground, the persistent current is no less than 150mA
Segment driver of LEDs, active with high level,
Keyboard scan input, active with high level, with pull-down resistor
Radix point segment output of LED, active with high level,
Key
Key Features
- Set display current drive layer internally, the current of segment is no less than 25mA, the current of word is no less than 160mA.
- Display scan control dynamically, support 8×4 or 7×4, directly drive four bits number LED or thirty two LEDs.
- Internal limit current, set eight level light control via space percentage.
- Set 28-key keyboard control, based on 7×4 matrix scan.
- Set pull-down resistor internal while key-press, glitter removable.
- Supply keyboard interr.