MPR121_10 Datasheet, PDF (1/57 Pages) Freescale Semiconductor, Inc – Proximity Capactive touch Senosr controller

Freescale Semiconductor
Technical Data
An Energy Efficient Solution by Freescale
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 I²C
address, an expanded filtering system with debounce, and completely
independent electrodes with auto-configuration built in. The device also
features a 13^th 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
• I²C 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
Device Name
MPR121QR2
Temperature Range
-40°C to +85°C
ORDERING INFORMATION
Case Number
Touch Pads
2059 (20-Pin QFN)
12-pads
MPR121
Rev 2, 04/2010
MPR121
Capacitive Touch
Sensor Controller
Bottom View
20-PIN QFN
CASE 2059-01
Top View
20 19 18 17 16
IRQ 1
SCL 2
SDA 3
ADDR 4
V_REG 5
15 ELE7
14 ELE6
13 ELE5
12 ELE4
11 ELE3
6 7 8 9 10
Pin Connections
IRC Address
0x5A - 0x5D
Shipping
Tape & Reel
This document contains a product under development. Freescale Semiconductor reserves the right to change or
discontinue this product without notice.
© Freescale Semiconductor, Inc., 2009, 2010. All rights reserved.