Details

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BUY LM3915N-1 https://www.utsource.net/itm/p/11243508.html
IC DRIVER DOT BAR DISPLAY 18-DIP

Parameter	Description	Min	Typ	Max	Unit
Supply Voltage (V+)	Operating voltage range	2.7	-	5.5	V
Quiescent Current	Current consumed by the IC when no load is applied	0.4	3.0	-	mA
Output Current	Maximum current that can be sourced or sunk by each output	-	30	-	mA
Input Voltage Range	Range of input voltages for which the IC operates correctly	0	-	V+	V
Dot/Bar Display Mode	Operating modes for display	-	-	-	-
Reference Voltage	Internal reference voltage used for level detection	1.25	-	-	V
Temperature Range	Operating temperature range	-40	-	85	°C

Instructions for Using the LM3915N-1:

1. Power Supply:

   • Connect the supply voltage (V+) to pin 6.
   • Connect ground (GND) to pin 4.

2. Input Signal:

   • Connect the input signal to pin 5 (IN).
   • The input signal should be within the range of 0 to V+.

3. Output Configuration:

   • The LM3915N-1 has 10 outputs (pins 1-10) that can be configured in either dot or bar mode.
   • For dot mode, connect pin 7 (MODE) to ground.
   • For bar mode, leave pin 7 (MODE) open or connect it to V+.

4. External Components:

   • For accurate operation, use external resistors and capacitors as specified in the datasheet to set the reference voltage and filter the input signal.
   • A typical configuration includes a 10kΩ resistor from V+ to pin 7 and a 10nF capacitor from pin 7 to ground.

5. Output Drive:

   • Each output can drive LEDs directly or be connected to transistors for driving higher current loads.
   • Ensure the total current drawn by the LEDs does not exceed the maximum output current of 30mA per output.

6. Thermal Considerations:

   • The IC should be mounted on a PCB with adequate thermal dissipation to ensure reliable operation within the specified temperature range.

7. Testing:

   • Apply a varying input voltage to pin 5 and observe the corresponding LED illumination pattern on the outputs.
   • In dot mode, only one LED will light up at a time, indicating the input voltage level.
   • In bar mode, a continuous segment of LEDs will light up, indicating the input voltage level.

8. Storage and Handling:

   • Store the IC in a dry environment to prevent moisture damage.
   • Handle with care to avoid static discharge, which can damage the IC.

For detailed specifications and additional information, refer to the official LM3915N-1 datasheet.

(For reference only)