LM3914 Dot/Bar Display Driver
Monolithic IC that senses analog voltage levels and drives 10 LEDs in a linear dot or bar graph display. Internal voltage reference and precision voltage divider included.
Aliase:LM3914N, LM3914N-1, LED Bar Graph Driver, VU Meter IC, Level Indicator
DIP-18 Top View
18 Pins
Pin-Tabelle18
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | LED1 | Digital | LED 1 Output (lowest level, current sink) |
| 2 | V- | Ground | Negative Supply / Ground |
| 3 | V+ | Power | Positive Supply (3V - 25V) |
| 4 | RLO | Analog | Divider Range Low End (sets lower display threshold) |
| 5 | SIG | Analog | Signal Input (analog voltage to display) |
| 6 | RHI | Analog | Divider Range High End (sets upper display threshold) |
| 7 | REF OUT | Analog | Internal 1.25V Reference Output (typ. 10mA source) |
| 8 | REF ADJ | Analog | Reference Adjust (connect resistor to set LED current) |
| 9 | MODE | Digital | Dot/Bar Mode Select (HIGH/V+ = Bar, Float = Dot) |
| 10 | LED10 | Digital | LED 10 Output (highest level, current sink) |
| 11 | LED9 | Digital | LED 9 Output (current sink) |
| 12 | LED8 | Digital | LED 8 Output (current sink) |
| 13 | LED7 | Digital | LED 7 Output (current sink) |
| 14 | LED6 | Digital | LED 6 Output (current sink) |
| 15 | LED5 | Digital | LED 5 Output (current sink) |
| 16 | LED4 | Digital | LED 4 Output (current sink) |
| 17 | LED3 | Digital | LED 3 Output (current sink) |
| 18 | LED2 | Digital | LED 2 Output (current sink) |