LM3915 LED driver
The LM3915 is a Logarithmic Display Driver IC commonly used in visualizing audio signals. It can drive both 10-segment Bar LED and Dot Matrix LED. The IC also allows the reference voltage and LED current to be easily programmed based on the application by selecting the right value of resistors.
Pin Configuration
Pin Number | Pin Name | Description |
1 and 10 to 18 | LED1, LED2, LED3.....LED10 | The 10 LEDs which has to be controlled is connected to these pins |
2 | V- / Ground | Ground pin of the IC |
3 | V+ / Vcc | Supply Voltage (3-18)V |
4 | RLO | Low level voltage for potential divider |
5 | Signal | Analogue signal Input pin based on which the LED is controlled. |
6 | RHI | High Level voltage for potential divider |
7 | REF OUT | Output Reference Voltage for LED current limiting |
8 | REF ADJ | Adjust pin for voltage reference |
9 | Mode | Select between Dot/Bar Mode |