MPR121QR2 datasheet(43/57 Pages) FREESCALE

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MPR121

Sensors

Freescale Semiconductor

AN3894: MPR121 GPIO and LED Driver Function

INTRODUCTION

MPR121 is a feature rich second generation touch sensor controller after Freescale’s initial release of the MPR03x series de-

vice. MPR121 not only has priority unique features like independent electrode auto configuration (refer to AN3889), 13th simu-

lated pseudo electrode for proximity detection (refer to AN3893), it also has 8 GPIO ports with LED driver capability. The GPIO

and LED driver function can be used when not all the 12 input sensing channels are occupied for touch sensing detection, which

is made possible by internal multiplexed pin structure. This increaseS the cost efficiency of the system and makes the MPR121

fit for even wider application.

MULTIFUNCTION PINS

MPR121 has 12 input sensing channels ELE0~ELE11, which occupies pin 8 to pin 19. Among these, pin 12 to pin 19 are mul-

tifunction pins. When these multifunction pins are not configured as electrodes, they may be used to drive LED or for general

GPIO purpose.

Figure 46. Configuration 1: MPR121 runs from a 1.71 V to 2.75 V supply.

PIN #

ELECTRODE

ELE0

ELE1

ELE2

ELE3

ELE4

ELE5

ELE6

ELE7

ELE8

ELE9

ELE10

ELE11

GPIO

—

GPIO0

GPIO1

GPIO2

GPIO3

GPIO4

GPIO5

GPIO6

GPIO7

VDD

ELE11/LED7

GND

0.1

μF

GND

1.71 V to 2.75 V

VDD

1.71 V to 2.75 V

VSS

VREG

IRQ

SCL

SDA

ADDR

REXT

ELE10/LED6

ELE9/LED5

ELE8/LED4

ELE7/LED3

ELE6/LED2

ELE5/LED1

ELE4/LED0

ELE3

ELE2

ELE1

ELE0

MPR121Q

TOUCH SENSOR

75 k

Ω 1%

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