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LM3915 Datasheet(PDF) 9 Page - Texas Instruments

Part No. LM3915
Description  LM3915 Dot/Bar Display Driver
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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LM3915 Datasheet(HTML) 9 Page - Texas Instruments

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LM3915
www.ti.com
SNVS740C – JANUARY 2000 – REVISED MARCH 2013
Figure 14. LM3915 Output Circuit
Outputs may be run in saturation with no adverse effects, making it possible to directly drive logic. The effective
saturation resistance of the output transistors, equal to RE plus the transistors' collector resistance, is about 50Ω.
It's also possible to drive LEDs from rectified AC with no filtering. To avoid oscillations, the LED supply should be
bypassed with a 2.2
μF tantalum or 10 μF aluminum electrolytic capacitor.
MODE PIN USE
Pin 9, the Mode Select input, permits chaining of multiple LM3915s, and controls bar or dot mode operation. The
following tabulation shows the basic ways of using this input. Other more complex uses will be illustrated in the
applications.
Bar Graph Display: Wire Mode Select (pin 9) directly to pin 3 (V+ pin).
Dot Display, Single LM3915 Driver: Leave the Mode Select pin open circuit.
Dot Display, 20 or More LEDs: Connect pin 9 of the first driver in the series (i.e., the one with the lowest input
voltage comparison points) to pin 1 of the next higher LM3915 driver. Continue connecting pin 9 of lower input
drivers to pin 1 of higher input drivers for 30 or more LED displays. The last LM3915 driver in the chain will have
pin 9 left open. All previous drivers should have a 20k resistor in parallel with LED #9 (pin 11 to VLED).
Mode Pin Functional Description
This pin actually performs two functions. Refer to the simplified block diagram below.
*High for bar
Figure 15. Block Diagram of Mode Pin Function
Copyright © 2000–2013, Texas Instruments Incorporated
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