MPR121接近电容式触摸传感器控制器

MPR121

Rev 2, 04/2010

Freescale Semiconductor Technical Data

An Energy Efficient Solution by Freescale

This document contains a product under development. Freescale Semiconductor reserves the right to change or discontinue this product without notice.

Advanced Information

Proximity Capacitive Touch Sensor Controller

MPR121 OVERVIEW

The MPR121 is the second generation sensor controller after the initial release of the MPR03x series devices. The MPR121 will feature increased internal intelligence in addition to Freescale’s second

generation capacitance detection engine. Some of the major additions include an increased electrode count, a hardware configurable I 2C address, an expanded filtering system with debounce, and completely independent electrodes with auto-configuration built in. The device also features a 13th simulated electrode that represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel or touch screen array.Features • 1.71 V to 3.6 V operation

•29 μA supply current at 16 ms sample period • 3 μA shutdown current •12 electrodes

•Continuous independent auto-calibration for each electrode input •Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence

•I 2C interface, with IRQ output to advise electrode status changes • 3 mm x 3 mm x 0.65 mm 20 lead QFN package •LED driver functionality with 8 shared LEDs •-40°C to +85°C operating temperature range Implementations

•Switch Replacements •Touch Pads Typical Applications

•PC Peripherals •MP3 Players •Remote Controls •Mobile Phones •

Lighting Controls

ORDERING INFORMATION

Device Name Temperature Range

Case Number Touch Pads IRC Address Shipping MPR121QR2

-40°C to +85°C

2059 (20-Pin QFN)

12-pads

0x5A - 0x5D

Tape & Reel

MPR121

Capacitive Touch Sensor Controller

Top View

Pin Connections

Bottom View

20-PIN QFN CASE 2059-01

1235

6789101211

13141516

171819204ELE4ELE3

ELE6ELE7ELE5V S S

R E X T

E L E 0

E L E 1

ADDR V REG

SCL IRQ SDA E L E 2

V D D E L E 11

E L E 10

E L E 9

E L E 8

PIN DESCRIPTION

Pin Description

Pin No.Pin Name Description

1IRQ Open Collector Interrupt pin

2SCL I2C Clock

3SDA I2C Data

4ADDR I2C Address Select

5 VREG VREG – 0.1 μF cap connect

6VSS Ground

7REXT External Resistor – 75 kΩ

8ELE0Electrode 0

9ELE1Electrode 1

10ELE2Electrode 2

11ELE3Electrode 3

12

ELE4

(LED0)

Electrode 4

13

ELE5

(LED1)

Electrode 5

14

ELE6

(LED2)

Electrode 6

15

ELE7

(LED3)

Electrode 7

16

ELE8

(LED4)

Electrode 8

17

ELE9

(LED5)

Electrode 9

18ELE10

(LED6)

Electrode 10

19ELE11

(LED7)

Electrode 11

20VDD VDD