Pressure Sensor - Freescale

May 2010 

Freescale 

Sensing the World 

Freescale's sensor solutions for industrial and medical 

Mathieu Forget 

EMEA Sensors marketing 

Freescale, the Freescale logo, AltiVec, C-5, CodeTEST, CodeWarrior, ColdFire, C-Ware, mobileGT, PowerQUICC, StarCore, and Symphony are trademarks of Freescale Semiconductor, Inc., 

Reg. U.S. Pat. & Tm. Off. BeeKit, BeeStack, CoreNet, the Energy Efficient Solutions logo, Flexis, MXC, Platform in a Package, Processor Expert, QorIQ, QUICC Engine, SMARTMOS, TurboLink 

and VortiQa are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2010 Freescale Semiconductor, Inc. 

TM

Acceleration 

*Sources: Gartner Dataquest, Strategy Analytics 




Pressure Proximity 

Freescale Market share position: #3 

2 

Sensors 

► Proliferation of embedded control driving demand 

► Sensors are one of our fastest-growing product line 

► Uniquely positioned with system-in-package technology 

► Leveraging high-volume, high-quality automotive manufacturing 

into consumer and industrial markets 

► Creating portfolio of highly integrated, easy-to-use acceleration, 

pressure and proximity sensors 

One Billion sensor shipment milestone in June 2009! 

TM

Inertial 

Packages 

Pressure 

Packages 

Evolution to higher integration, more features, 

while continuing to lower power, and reduce package size 

SOIC20 SOIC16 

SOP 

Differential 

SOP 

Ported 

Automotive Qualified Packages 

QFN 

6x6x1.98 mm 

SOIC20 

(TPMS) 

QFN 

6x6x1.45 mm 

QFN 

(TPMS) 




LGA 

3x5x1 mm 

SSOP MPAK Chip Pak LGA 

3 

TM

Software 

Complexity 

Simple (Raw) 


Individual sensors, 

no MCU 

OEM 

SENSOR 

SUPPLIER 

Sensor 

algorithms 

deployed on 

apps 

processor 

Enhanced 


Individual sensors, 

simple ASICencoded 

features 




MEMS – The Software Challenge 

Third party 

Apps SW 

Third party 

provides 

applications 

algorithms 

4 

Smart Sensor 

Platform 

Multiple sensors, 

integrated MCU 

Simple 

function calls 

to features 

eases OEM 

deployment 

TM

FSL Proposal: Sensors with Configurable Data Rate and Auto 

Wake 

1. Sensor samples data at 

low data rate, filters 

and does the analyze. 

2. The MCU can program 

the sensor to raise 

interruption in case of 

various events. 

3. If one or more of such 

conditions are detected, 

sensor raises an 

Interrupt to the MCU 

and increase data rate. 

4. Further the MCU then 

can do an I2C Read for 

getting information on 

the type of the occurred 

event. 

Key Advantages 

SENSOR 

MCU 

• For several use cases it is not required to have Software 

for analyzing data running on the MCU. 

- Reduced Computational Load 

- Reduced I2C Traffic 

• The MCU can be turned off and woken up by the Sensor 

• Grant a proper responsiveness to events even in the critical 

use cases 



and VortiQa are trademarks of Freescale Semiconductor, Inc. All other product or service names are the property of their respective owners. © 2010 Freescale Semiconductor, Inc. 5 

I2C Bus 

Data 

Analysis 

Interrupt 

TM

Optimize Your Power with Auto-wake on Event Detection 

� Auto-wake when defined event is triggered 

� Auto-sleep when programmable idle time 

1.3g 

g 

Interrupt 

Trigger 

Low power Normal 

Programmable idle 

Sampling rate 

Programmable normal time 

Programmable normal 

sampling rate 




t 

TM

Inertial 


Proximity 

Touch sensor 

Radar 

Magnetic 




Technologies & Markets 

7 

Motion Control 

Human Machine Interfaces 

Medical, White Goods 

Automotive 

TM

Diaphragm 

Diffused Strain Gauge 

Single Chip Integrated Pressure Sensor 




8 

Pressure Sensors 

Signal 

Conditioning 

TM

Device 

MPX10 thru MPX53 

MPXM2000 series 

MPX4000 series 

MPX5000 series 

MPXH & MP3H series 

MPXV7000 Series 

MP3V Series 

MPL115A 

DESCRIPTION 

Uncompensated sensor series from 10-50kPa 

Compensated sensor series available from 10-200kPa 

Absolute Integrated Pressure sensors up to 250kPa 

Integrated high pressure sensors up to 1000kPa 

Integrated pressure sensors for altimeter, barometer, MAP/BAP 

Integrated pressure sensor for Positive and Negative apps 

Integrated differential pressure sensors for + 3V Operation 

Digital absolute pressure sensors for altimeter, barometer 




9 

Pressure Sensors 

Product offerings 

Package 

SOP/Unibody 

MPAK/Unibody 

Unibody/SOP 

Unibody 

SOP & SSOP 

SOP 

SOP 

LGA 

TM

Sleep Apnea 

MPXV5004G 

Gauge 

Washing Machines 

MPXV5004G 

Gauge 

Vacuum Cleaner 

MPXV5050D 

Vacuum 




Pressure Sensors - Top Applications 

Medical Consumer 

Blood Pressure 

MPX2051GS, MPXV5050D 

Gauge 

Barometer 

MPXM2102A 

Absolute 

Appliance Industrial 

Pump Diagnostics 

10 

Altimeter 

MPXH6115A 

Absolute 

Filter monitoring 

MPX2053D 

Differential 

TM

Silicon Die 

Top view 




Peizoresistive Pressure Sensing 

Transducer 

Diaphragm 

Metal Pad 

Cross section 

Pressure applied to the diaphragm is converted to voltage by the transducer 

TM

Silicone Gel Die Coat 

Wire Bond 

Leadframe 

P1 

P2 

Stainless Steel Cap 




Typical Gauge Pressure Sensor 

Thermoplastic 

case 

Die 

RTV Die 

Bond 

Typical Gauge Configured Pressure Sensor 

Flourosilicone Gel 

• Protects wire bonds and top 

side of die surface from 

environment 

• Pressure transmitted to 

diaphragm 

RTV donut 

• Allow pressure transfer to 

chip cavity 

TM

Power 

Supply 

Vertical pipe - one end 

dipped into the water and 

the other end opened - 

The level in the pipe will be 

exactly the same as the level in 

the tank. 

Pressure sensor / 

Use scenario - Water level: air pipe sensing method 

TUB 

User Interface 

8-bit MCU 

f 

MC68HC08MP16 

Pressure Sensor 




2E72G 

SSAC9616-A 

Motor Driver 

M 

Motorola 

Dave’s 

Control 

Center 

MOTOR/PUMP 

Pressure = rgh 

r = density 

g = gravity constant 

h = liquid height 

13 

However, if the upper 

end of the pipe is 

closed off and some 

air volume is trapped, 

the pressure in the 

pipe will vary 

proportionally with the 

liquid level change in 

the tank. 

TM

TOP APPLICATIONS 

To avoid: 

• necrosis of the muscle 

• pressure sores or 

• ulceration 




14 

Air Mattress 

• IPS differential MPXV5010DP offers 

robust packaging and high sensitivity. 

• Compensated MPVX2010DP offers 

lower cost. 

• Uncompensated MPX12 offers best 

sensitivity. 

TM


Chip Pak Medical Pressure Sensor 

Differential Pressure Sensors 

4 to 1000 kPa 

Assisted Ventilation 

Spirometer 

Inhalers 

Sleep Apnea 

Asthma Monitoring 

Cuff Blood Pressure Meter 

Invasive Blood Pressure Meter 

Dialysis Equipment 

Patient monitoring 

Air Mattress & Cushion 




Medical pressure sensors 

Absolute Pressure Sensors 

100 to 1000 kPa 

Anesthesia Gas monitor 

15 

TM





Non-invasive Blood Pressure 

►Non-invasive blood pressure 

consists of automatic or 

manual, arm-type or wristtype. 

► IPS MPXV5050 offers high 

volume production capability 

for manufacturers. 

► Compensated MPXM2051 

offers lower cost. 

16 

TM


Continuous Positive 

Air Pressure 

C.P.A.P is an airflow generator with 

pressure monitor system to deliver a 

continue pressure. It is used for treating 

sleep apnea. 

Recommended product 

MPXV5004G 




Medical Pressure/Flow Measurements 

Peak Flow Meter 

Peak flow meter are used to provide 

peak flow value for lung function 

control and to turn it into an action 

plan. Ex Asthma monitor & therapy 

Recommended products 

MPXV5004G, MPXC2012DT1 

17 

TM

Pressure Sensor Solutions Matrix for Medical 

Applications Freescale Sensors Differentiators 

Invasive & non-invasive blood 

pressure monitor 

Fetal heart rate monitor 

MPX2300DT1, MPX2301DT1, 

MPXM2053GS, MP3V5050 

Sleep apnea MPXV4006G, MP3V5004, 

MPXV7002 

Inhalers & ventilators MPXC2011DT1, MPXV5004G, MPXV7007DP 

MPX12GP, MPX5700GP, MP3H6115, MPL115A 




High quality, high volume production, 

biocompatibility, technical support 

Low cost, high sensitivity, amplified, 

multiple porting options, technical support 

Small form factor, high sensitivity, low cost, 

high volume production, technical support 

Hospital beds MPX2010DP, MPX5010DP Robust packaging, high sensitivity, fully 

amplified, technical support 

Wound management MPXV2053GVP, MPXV5100G, MPL115A Small package height, multiple porting 

options, technical support 

Devices Description Package 

MPX10, MPX12, MPX53 Uncompensated sensor series from 10-50kPa SOP/Unibody 

MPXM2000 series Compensated sensor series available from 10- 

200kPa 

MPX4000&5000 series Integrated Pressure sensor series available from 

4-500kPa 

MPX5700/5999 Integrated high pressure sensors 700 & 1000kPa 

respectively 

MPXH6115 series Integrated pressure sensors for altimeter, 

barometer, 

MAP/BAP apps 

MPAK/Unibody 

SSOP/SOP/ 

Unibody 

SOP & SSOP 

18 

TM

►Features 

� Digital output options 

� MPL115A1 for SPI applications 

� MPL115A2 for I2C applications 

� Low-profile 3 x 5 x 1.2 mm LGA package 

� Low current consumption 

� Sleep mode: 1 µA 

� Active mode: 10 µA at 1 Hz measurement 

rate 

� Robust EMI shielding 

� Fully calibrated and compensated 

� Pressure output in kilopascals (kPa) for easeof-use 

� 50 to 115 kPa absolute range 

� 1 kPa accuracy / 10bit ADC 

� 2.375V to 5.5 Volt power supply 

� - 40°C to +105°C operating temperature 

Digitized pressure and temperature information 

together with programmed calibration coefficients for 

host micro use. 




Pegasus (MPL115A) 

Pressure Sensor Overview 

19 

Diff 

Amp 

Temp 

Sensor 

MUX 

Coefficient 

Storage 

ADC 

ADDR 

ADDR 

ADDR 

ADDR 


ADDR Temperature 

I2 I C 

Interface 

2C Interface 

VDD 

VP 

RST 

SCL 

SDA 

GND 

TM





20 

Wound management 

► IPS MPXV5050 offers high 

volume production capability 

and multiple porting option. 

► Compensated MPXM2053 

offers lower cost. 

► New digital compensated 

MPL115A offers ultra low 

cost and small package 

height for disposable 

solutions. 

TM




MPL115A in Wound Management 

►The MPL115A digital pressure sensor essentially can act as a 

vacuum sensor at altitudes below 10,000 Feet. Broader pressure 

range is achieved closer to Sea Level. 

BANDAGE 

PUMP 

Atmospheric 

Pressure, Po at 

about 101 kPa 

Suction Pressure 

about 40 kPa below 

Po at 61 kPa 

Wound 

21 

MPL115A as 

barometric sensor 

PCB 

MPL115A as 

vacuum sensor 

TM




MPL115A for Vacuum Cleaner Applications 

► The MPL115A digital pressure sensor can be used in vacuum cleaner applications 

by implementing AUTO ZERO. At the end of operation, the atmospheric pressure 

should be measured and stored in memory. At the beginning of the next cycle, the 

suction pressure created by the air compressor can be monitored to ensure the air 

filter is allowing adequate suction pressure. Pcanister = P ambient when Vacuum 

is OFF. 

AIR COMPRESSOR 

VACUUM CLEANERS 

AIR FILTER 

CANISTER 

Pcan 

Pcan = Pamb – 50kPa 

Pamb = 101 kPa 

22 

TM

Market Segment 

Medical Low 


Fluid Level 

Air Flow 

Industrial 

High Pressure 

Harsh Media 

HDD 

Altimeter & 

Barometric 

Confidential 

MPXH6000A 

100 to 400kPa Abs 

Analog Out 




C&I Pressure Sensor Roadmap 

Current 2007 2008 2009 2010 2011 Future 

MPXV5004G 

4 kPa 

Analog Out 

MPVZ5004G 

4 kPa 

Analog Out 

MPX5999D 

1000kPa 

Mild media 

Pegasus 

Barometer for HDD 

LP Differential (40kPa) 

PRT shrink + 

Cost reduced medical package 

Horizon 

Smart Altimeter 

Ultra low Pressure 

PRT shrink. + low-cost, 

media-isolated package 

Roadmap 

Roadmap 

Legend 

Legend 

Proposed 

Proposed development 

development window 

window New product proposal 

Development Validation Product in in development 

1st samples PPAP SOP MP 

Production 

Current 2007 2008 2009 2010 2011 Future 

Start 

Start 

TM

ACCELEROMETERS 




TM

Home Appliances 

• Unbalanced Load Detection 

• Vibration Monitoring 

MMA7455L (±2g/4g/8g) 

Asset Tracking & Fleet Mgt 

• Freefall Detection 

• Motion and Shock Detection 

• Anti theft Monitoring 

MMA8450Q (±2g/4g/8g) 

Activity Monitoring 

Motion Detection 

Range of Motion 

Pedometry 

MMA8450Q (±2g/4g/8g), MMA7660 (±1.5g) 

Machine Health 

• Vibration Monitoring: 

• Frequency, Amplitude, and 

Spectrum (vibration signature) 

MMA8450Q (±2g/4g/8g) 




Accelerometer Markets 

25 

Gaming 

• Tilt 

• Shock Detection 

•Motion Control 

MMA8450Q (±2g/4g/8g) 

Shock and Tilt Sensing 

• Safety and control 

• Handled product space localization 

MMA8450Q (±2g/4g/8g), MA7660L(±1.5g) 

TM

► Features 

• 8 bits I2C/SPI digital output 

• Option of 10 bits I2C/SPI @ 8g 

• 2.4 – 3.6V Vdd operation 

• 1.8V I/O compatible 

• 400uA Idd, 5uA at sleep mode 

• Selectable full scale range (2g, 4g, 8g) 

• Motion signature detection 

• Single and double pulse detect 

• Programmable threshold 

► Package 

• 3 x 5 x 1.0mm LGA-14 

• Side by side die mount 

• RoHS compliant 

• -40°C to +85°C operating temp 




Digital 3-Axis Accelerometer - MMA7455L 

26 

TM

► Features 

• Low current consumption 

� Off mode: 0.4 µA 

� Standby mode: 2 µA 

� Active mode: 47 µA at 1 sample per second 

• ±1.5g 3-axis digital accelerometer with I2C (400 kHz max.) 

• Low-profile 3 x 3 x 0.9 mm DFN package 

• Configurable output data rate from 1 to 120 samples per second 

• Configurable auto wake/sleep for low power consumption 

• Low voltage operation: 2.4 V – 3.6 V 

� 1.71 to 3.6 V for digital I/O (including I2C) 




Digital 3-Axis Accelerometer - MMA7660FC 

• Configurable tilt orientation detection for portrait/landscape capability 

• Gesture detection including shake and tap detection 

• Robust design, ability to survive shocks up to 10,000g 

► Implementations 

• Landscape/portrait determination 

• Mobile product user interface by limited gestures 

• User interface navigation with tilt to scroll 

• Power mode determination 

27 

TM

22 steps taken step @ ODR = 30Hz 

[+/- 1.5G => +/- 32] 

Processed Step Intensity Level 

Raw ADC Counts 

40 

30 

20 

10 

0 

-10 

-20 

-30 

15.00 

10.00 

5.00 

0.00 

-5 .0 0 

-10.00 

6-Bit TRON Accelerometer Pedometry Application 

3-Axis Raw Data (Normalized to 0) 

1 27 53 79 105 131 157 183 209 235 261 287 313 339 365 391 

X Y Z 

ADC Samples @ 30Hz 




6-bit TRON @ 30 Hz 

we can detect heel Walking 

Running 

and toe springing effect. 

Isolated Analysis of the Y Axis 

Raw ADC Counts (+/- 

1.5 = +/- 32) 

40 

30 

20 

10 

0 

-101 

23 45 67 89 111133155177199221243265287309331353375 

-20 

28 

ADC Samples @ 30Hz 

Walking Step Count Detection 

Running 

0 

1 

2 3 4 5 

6 

7 

8 

9 10 

1 23 45 67 89 111 133 155 177 199 221 243 265 287 309 331 353 375 

Data from all 3 axis are analyzed 

in step counting Including frequency 

and amplitude. 

11 

12 

ADC Samples @ 30 Hz 

13 

14 

15 16 17 18 19 20 21 

TM

Multiple ZigBeeTM Sensing Triple-Axis Reference Design 

RD3965MMA7660FC (ZSTAR3) 

► ZSTAR3 reference platform features 

• MMA7456L digital,MMA7361L analog triple-axis accelerometer -> NOW ALSO 

MMA7660FC 

• Accommodates multiple digital and analog accelerometer boards 

• 2.4 GHz MC13213 low-power transceiver and an S08 MCU in one package 

• ZigBee 2.4 GHz allows global deployment and mesh networks 

• System-in-package (SiP) for reduced PCB size and less external components 

• 8-bit USB 2.0 full-speed MC68HC908JW32 MCU 

• Low-power, low-current operation – extended battery life 

• Fast power-up response time 

• Software support for easy development 

• Price: $99 

► Low-power wireless applications 

• Mobile phones 

• Portable media players 

• Handheld gaming devices 

• Computer peripherals 

• GPS navigation devices 

The newest development tool for evaluating the digital 

accelerometer family 




29 

TM

High Pass Filter enables Rapid Gesture 

Detection and Enhanced Tap Detection 

Input 

HPF 

Output 

Acceleration Point 

(3rd Derivative of Displacement) 

Programmable Threshold 

Embedded 32 data point FIFO reduces processor cycles, 

reduces system power, and reduces I2C bus contention. 

32 

Sample 

s for 

each 

X,Y,Z 

FIFO Data 

(Xn-1,Yn-1,Zn-1) 

Acquisition Data 

(Xn,Yn,Zn) 

Within 1 Clock Cycle 

Read 

FIFO 

Read 

Data 

Mathematical 

Functions 

Compare 

Average 

Derivative 

Filter 

Price: $1.4 RSL for 50 Ku 

► Features 




MMA8450/Proton Overview 

• 1.71V to 1.89V supply voltage 

• ±2g/±4g/±8g dynamically selectable full-scale 

• Output data rate (ODR) from 400Hz to 1.563Hz 

• 400µg/ Hz noise at normal mode ODR=400Hz 

• 12 bit digital output 

• I²C digital output interface 

• Programmable 2 interrupt pins for 8 interrupt sources 

• Embedded 4 channels of motion detection 

� Free fall or motion detection: 2 channels 

� Pulse detection: 1 channel 

� Transient detection : 1 channel 

� Orientation (Portrait/Landscape) detection with 

hysteresis 

� Automatic ODR change for auto-wake-up and 

return-to-sleep 

• Embedded 32 sample FIFO simplifies position tracking 

analysis 

• Embedded self test 

• 10000g high shock survivability 

► Package 

• 3mm x 3mm QFN, 1.00mm max height 

• -40°C to +85°C Operating Temp 

30 

TM

► Function: HPF allows for detection of Rapid Movements such as Jolt. 

► Benefits: 




MMA8450Q High Pass Filter 

• Offset correction – allows for offset to be removed from the high motion gesture algorithms. 

• MMA8450’s highly flexible HPF allows for 4 options per ODR (16 configurations) 

• Saves processor cycle time – Processor does not need to include filtering algorithms, HPF data is 

externally accessible. 

Input 

High 

Pass 

Filter 

Output 

31 

Acceleration Point 

0x17 HP_FILTER_CUTOFF: High Pass Filter Register (Read/Write) 

Bit 

7 

Bit 

6 

Bit 

5 

Bit 

4 

Bit 

3 

Bit 

2 

0 

0 

0 

0 

0 

0 

SEL 

1 

SEL 

0 

Table 7.10 HP_FILTER_CUTOFF Setting Options 

SEL 

1 

SEL 

0 

Fc @ 

ODR = 

400Hz 

Fc (Hz) @ 

ODR = 

200Hz 

Fc (Hz) @ 

ODR = 

100Hz 

0 

0 

1 

1 

0 

1 

0 

1 

4 

2 

1 

0.5 

2 

1 

0.5 

0.25 

(3rd Derivative of Displacement) 

Programmable Threshold 

Bit 

1 

1 

0.5 

0.25 

0.125 

Bit 

0 

Fc (Hz) @ 

ODR = 50Hz 

0.5 

0.25 

0.125 

0.062 

Fc (Hz) @ 

ODR = 12.5Hz 

0.125 

0.063 

0.031 

0.016 

Fc (Hz) @ 

ODR = 

1.563Hz 

0.01 

0.007 

0.004 

0.002 

TM

Function: Embedded 32 data point FIFO (per Axis) 




MMA8450 Motion detection FIFO 

Benefits: 

1. Saves processor cycle time – Processor does not need to include additional algorithm to poll data. 

2. The FIFO can be used for power savings in applications where the device is waiting for an inertial 

event to occur or logging data. 

3. The FIFO allows the application processor to sleep and have data collected independently as it is 

buffered in the FIFO. 

4. Reduces I2C bus traffic since data does not need to be continuously sent. Upto 32 samples from FIFO 

can be stored and flushed when I2C is available. 

32 

Samples 

for each 

X,Y,Z 

FIFO Data 

(Xn-1,Yn-1,Zn-1) 

Acquisition Data 

(Xn,Yn,Zn) 

Read 

FIFO 

Read 

Data 

Within 1 Clock Cycle 

32 

Mathematical 

Functions 

Compare 

Average 

Derivative 

Filter 

TM

FUNDAMENTALS 

EMBEDDED 

FEATURES 

POWER SAVING 

3-AXIS 

DIGITAL 

TILT 

orientation 

SLEEP 

12-BIT 

8-BIT 

TAP 

2TAP 

detection 

AUTO 

SLEEP 

No motion 

timer 

±2,4,8g 

MOTION 

threshold 

AUTO 

WAKE 




MMA8450Q Digital Accelerometer 

I2C 

interface 

FREE 

FALL 

detection 

POWER 

SELECT 

motion 1.563-400 

samples/s 

3x3x1 

QFN16 

TRANS- 

IENT 

detection 

SYSTEM 

POWER 

SAVE 

INTERRUPT on 

EMBEDDED 

EVENT 

33 

NEW 

g-CELL 

HIGH 

PASS 

FILTER 

32 

SAMPLE 

FIFO 

2 

INTERR- 

UPTS 

TM

► Application notes: 

• Embedded Orientation Detection Using the 

MMA8450Q (AN3915) 

• Offset Calibration of the MMA8450Q (AN3916) 

• Motion and Freefall Detection Using the MMA8450Q 

(AN3917) 

• High Pass Filtered Data and Transient Detection Using 

the MMA8450Q (AN3918) 

• MMA8450Q Single/Double and Directional Tap 

Detection (AN3919) 

• Using the 32 Sample FIFO (First In First Out) in the 

MMA8450Q (AN3920) 

• Low-Power Modes and Auto-Wake/Sleep Using the 

MMA8450Q (AN3921) 

• Data Manipulation and Basic Settings of the 

MMA8450Q (AN3922) 

• MMA8450Q Design Checklist and Board Mounting 

Guidelines (AN3923) 

► Product data sheet 

► Product fact sheet 

► Acceleration sensor general fact sheet 

► Sensor Solutions brochure 

► www.freescale.com/xyz 

MMA8450Q Accelerometer Related Literature 




34 

TM

A Touch Better - Proximity Sensing Solutions 




TM

MPR121 Touch Sensor 

► Extremely low power at 29 μA 

• Supports up to 12 touch electrodes 

w/Proximity detect pseudo electrode 

• 1.71 V to 3.6 V operational voltage 

• Second generation optimized independent 

auto-calibration and auto-configuration system 

•I 2 C communication & touch/ prox interrupt 

• Only 1 external passive necessary, no 

passives per channel! 




Freescale New Touch Sensing Solutions 

Touch Sensing Software 

► Enables 8-bit S08 MCUs as a touch 

sensor 

• Supports up to 64 electrodes 

• 1.8 V to 5.5 V operational voltage 

• Keypad, slider, rotary, matrix, touch-pads 

• Supports multiple communication protocols: I 2 C, 

LIN, CAN , SPI, USB 

• Have other peripherals working at the same 

time: LCD, LEDs, buzzer, ADC, other sensors, 

and more 

TM

Features MPR031/032 MPR121 MPR083/084 

# of Electrodes 

3 electrodes 

State machine 

12 electrodes 

State machine 

8 electrodes 

Multiple Configurations 




37 

Touch sensing 

Software Suite 

Multiple Configurations 

Depending on MCU 

Operational Voltage 1.71 to 2.75 volts 1.71 V to 3.6 Volts 1.8 to 3.6 volts 1.8 to 5.0 volts 

Communication Interface Digital I²C Digital I²C Digital I²C Based on MCU 

Auto-Calibration / 

Compensation 

Simultaneous Touches 

Rotary Configuration 

Touch Acquisition 

Proximity & eField sensors portfolio 

Yes Yes Yes Yes 

Stand alone solution 

(No MCU needed) 

Low Power Mode Yes Yes Yes Yes 

Included 

Current consumption 4 µA (64 ms response 29 µA (64 ms response 41 µA (1 s response Based on MCU 

time) 

time) 

time) 

External HW 

Requirements 

Only 1 External Resistor Only 1 External Resistor Only External Resistors Only External Resistors 

Package Types 2x2x0.65mm 8-lead 3x3x0.65 mm 20-lead QFN 16-pin Lead-Free 

Based on MCU 

µDFN 

QFN and TSSOP 

Temp Ranges -40°C to 85°C -40°C to 85°C -40°C to 85°C -40°C to 85°C 

Pricing (10Ku) $0.43 RSL $0.78 RSL $1.07 RSL NA 

LOW POWER 

MCU BASED 

TM

Introducing the MPR031/2 Proximity Capacitive Touch Sensor 

Controller 

► Features 

� Down to 4 µA typical supply current 

� Compact 2 mm x 2 mm x 0.65 mm 8-lead 

µDFN 

� Supports up to 3 touch pads 

� Only one external component needed 

� Intelligent touch detection capability 

� 1.71 V to 2.75 V operation 

� Threshold based detection with hysteresis 

� I 2 C interface, with optional IRQ 

� Multiple devices in a system allow for up to 6 

electrodes 

� -40°C to +85°C operating temperature 

range 

► Implementations 

• Switch replacements 

• Touch pads 




38 

Package Pinouts 

TM

Touch Sensor Controller Implementation 

Interrupt functionality and Self Calibration 

►MPR03X uses a state machine to operate a capacitive 

measurement engine to analyze the electrodes and determine 

whether a pad has been touched or released. 

MPR03X interrupt 

output is triggered 

on any touch 

related event. 

Electrodes can be connected to the MPR03X in two different configurations, one with an IRQ and one without 




39 

TM

MPR121 Proximity Capacitive Touch Sensor Controller 

Register-driven ASIC state machine 

Feature Improvements 

► Features 

New Auto-configuration system 

► • Supports up to 12 touch pads 

2nd generation filtering system 

► • 29 µA supply current (All 12 electrodes being (internal noise filter) 

monitored, 12 ms response time) 

Increased voltage range 

► • Compact 3 x 3 x 0.65 mm 20-lead QFN 

100% independent electrode control 

► • Only one external component needed 

► • 3 µA maximum shutdown current 

► • 1.71 V to 3.6 V operation 

► • Separate touch and release trip thresholds for each electrode 

� Provides hysteresis and electrode independence 

► • I2C interface, with optional IRQ 

► • (4) I2C addresses allow up to 48 electrodes 

► • -40°C to +85°C operating temp range 

I 

Interface 

2C Serial 

SCL VDD 




9 

VSS 

. 

IRQ 

VSS 

10 

12 11 

75k 

SDA 

IRQ 

ADDR 

ELE8 

ELE9 

ELE10 

ELE11 

REXT 

1.71V to 2.75V 

IBAT 

VSS 

VSS 

VREG 

ELE0 

ELE1 

ELE2 

ELE3 

ELE4 

ELE5 

ELE6 

ELE7 

47nF 

VSS 

2 

3 

40 

1 

4 

6 5 

7 8 

VSS 

. 

2.5V to 3.6V 

47nF 47nF 

I 

Interface 

2C Serial 

VSS 

SCL VDD VREG 

SDA IBAT ELE0 

VSS 

IRQ IRQ 

ELE1 2 1 

ADDR 

ELE2 

3 4 

VSS 

ELE8 

ELE3 

ELE4 

9 10 ELE9 

ELE5 6 5 

ELE10 

12 11 

ELE6 

ELE11 

7 8 

75k 

ELE7 

REXT VSS 

VSS 

TM

LCD LEDs 

Under development 

Currently available 

Touch Panel 

Main MCU 

Touch Sensing 

Software Suite 

Buzzer IIC 

1 2 3 

4 5 6 

7 8 9 




* 0 # 

Touch Sensing Software Solution 

► Features: 

► Configurable Rotary, Slider, 

Keypad decoders 

► Full API set support 

► Smart auto-calibration 

mechanisms for environment 

hassles 

► Noise rejection algorithms 

► Optimized buffer structure 

enabling any arrange of 

electrodes 

► Ability to enable and disable keys 

on runtime 

► Auto repeat, stuck-up key, gorilla 

hand and other typical HMI 

functions . 

► Capability to coexist with other 

application code. 

41 

TM

►Touch Sensing Software (TSS) 

• TSS enable almost any Freescale MCU 




C&I Touch sensing product’s features 

� S08 family now, 32-bit V1 Coldfire family in June 2010 

• Sensor and application in the same MCU 

• Best flexibility: User’s experience can be customized 

• Up to 64 electrodes 

►Touch Capacitive Touch Sensor Controllers 

• Independent IC that communicates through I2C with the main MCU 

• Low power device to improve battery life 

• The designer can setup touch configuration and behavior 

• The controller does everything for you 

� Noise rejection, Debounce, Auto Calibration, FIFO buffer, IRQ. 

42 

TM

► Higher integration in a smaller footprint 

► Large products portfolio for consumer, 

industrial and automotive needs 

► 30 years of innovation in MEMS-based 

sensors 

► Growing business for Freescale 

• Investing in sensors 

► Development tools and support 




Why Freescale Sensors ? 

Acceleration 


Proximity 

43 

TM




44 

Thank you ! 

TM

Pressure Sensor - Freescale

Create successful ePaper yourself

Delete template?

Save as template?