CD4052BM datasheet(24/48 Pages) TI

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9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The CD405xB multiplexers and demultiplexers can be used for a wide variety of applications.

9.2 Typical Application

One application of the CD4051B is to use it in conjunction with a microcontroller to poll a keypad. Figure

9-1 shows the basic schematic for such a polling system. The microcontroller uses the channel select pins

to cycle through the different channels while reading the input to see if a user is pressing any of the keys.

This application is a very robust setup, allowing for multiple simultaneous key-presses with very little power

consumption. This setup also uses very few pins on the microcontroller. The down side of polling is that the

microcontroller must continually scan the keys for a press and can do little else during this process.

INH

C B A

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

Ch 0

Ch 1

Ch 2

Ch 3

Ch 4

Ch 5

Ch 6

Ch 7

COM

CD4051B

Microcontroller

Input

Channel Select

VEE

VSS

VDD

Pull-down resistors (10NŸ)

3.3 V

Figure 9-1. The CD4051B Being Used to Help Read Button Presses on a Keypad.

9.2.1 Design Requirements

These devices use CMOS technology and have balanced output drive. Take care to avoid bus contention

because it can drive currents that would exceed maximum limits. The high drive will also create fast edges into

light loads, so routing and load conditions should be considered to prevent ringing.

CD4051B, CD4052B, CD4053B

SCHS047K – AUGUST 1998 – REVISED MARCH 2023

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