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PDF MPR121QR2 Data sheet ( Hoja de datos )

Número de pieza MPR121QR2
Descripción Proximity Capacitive Touch Sensor Controller
Fabricantes Freescale Semiconductor 
Logotipo Freescale Semiconductor Logotipo



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No Preview Available ! MPR121QR2 Hoja de datos, Descripción, Manual

Freescale Semiconductor
Data Sheet: Technical Data
An Energy Efficient Solution by Freescale
Document Number: MPR121
Rev. 4, 02/2013
Proximity Capacitive Touch
Sensor Controller
The MPR121 is the second generation sensor controller following the
initial release of the MPR03x series of devices. The MPR121 features an
increased internal intelligence plus Freescale’s second generation
capacitance detection engine. Some major enhancements include an
increased electrode count, a hardware configurable I2C address, an
expanded filtering system with debounce, and completely independent
electrodes with built-in autoconfiguration. The device also features a 13th
simulated electrode which represents the simultaneous charging of all the
electrodes connected together. When used with a touch panel or touch
screen array, the 13th simulated electrode allows a greater near proximity
detection distance and an increased sensing area.
Features
• 1.71V to 3.6V operation
• 29 μA typical run current at 16 ms sampling interval
• 3 μA in scan stop mode current
• 12 electrodes/capacitance sensing inputs in which 8 are
multifunctional for LED driving and GPIO
• Integrated independent autocalibration for each electrode input
• Autoconfiguration of charge current and charge time for each
electrode input
• Separate touch and release trip thresholds for each electrode,
providing hysteresis and electrode independence
• I2C interface, with IRQ Interrupt output to advise electrode status
changes
• 3 mm x 3 mm x 0.65 mm 20 lead QFN package
• -40°C to +85°C operating temperature range
Implementations
• General Purpose Capacitance Detection
• Switch Replacements
• Touch Pads, Touch Wheel, Touch Slide Bar, Touch Screen Panel
• Capacitance Near Proximity Detection
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
Bottom View
20-PIN QFN
CASE 2059-01
Top View
20 19 18 17 16
IRQ
SCL
SDA
ADDR
VREG
1
2
3
4
5
15 ELE7
14 ELE6
13 ELE5
12 ELE4
11 ELE3
6 7 8 9 10
Pin Connections
I2C Address
0x5A - 0x5D
Shipping
Tape & Reel
© 2009-2011, 2013 Freescale Semiconductor, Inc. All rights reserved.

1 page




MPR121QR2 pdf
Table 2. Register Map
REGISTER
ELE0 - ELE7 Touch Status
ELE8 - ELE11, ELEPROX Touch Status
ELE0-7 OOR Status
ELE8-11, ELEPROX OOR Status
ELE0 Electrode Filtered Data LSB
ELE0 Electrode Filtered Data MSB
ELE1 Electrode Filtered Data LSB
ELE1 Electrode Filtered Data MSB
ELE2 Electrode Filtered Data LSB
ELE2 Electrode Filtered Data MSB
ELE3 Electrode Filtered Data LSB
ELE3 Electrode Filtered Data MSB
ELE4 Electrode Filtered Data LSB
ELE4 Electrode Filtered Data MSB
ELE5 Electrode Filtered Data LSB
ELE5 Electrode Filtered Data MSB
ELE6 Electrode Filtered Data LSB
ELE6 Electrode Filtered Data MSB
ELE7 Electrode Filtered Data LSB
ELE7 Electrode Filtered Data MSB
ELE8 Electrode Filtered Data LSB
ELE8 Electrode Filtered Data MSB
ELE9 Electrode Filtered Data LSB
ELE9 Electrode Filtered Data MSB
ELE10 Electrode Filtered Data LSB
ELE10 Electrode Filtered Data MSB
ELE11 Electrode Filtered Data LSB
ELE11 Electrode Filtered Data MSB
ELEPROX Electrode Filtered Data LSB
ELEPROX Electrode Filtered Data MSB
ELE0 Baseline Value
ELE1 Baseline Value
ELE2 Baseline Value
ELE3 Baseline Value
ELE4 Baseline Value
ELE5 Baseline Value
ELE6 Baseline Value
ELE7 Baseline Value
ELE8 Baseline Value
ELE9 Baseline Value
ELE10 Baseline Value
ELE11 Baseline Value
ELEPROX Baseline Value
MHD Rising
NHD Amount Rising
NCL Rising
FDL Rising
MHD Falling
NHD Amount Falling
ELE7
OVCF
E7_OOR
ACFF
ELE6
E6_OOR
ARFF
Fields
Register Initial
Address Value
Auto-
Increment
Address
ELE5
E5_OOR
ELE4
ELE3
ELE2
ELEPROX ELE11
ELE10
E4_OOR E3_OOR E2_OOR
PROX_OOR E11_OOR E10_OOR
EFD0LB
EFD1LB
EFD2LB
EFD3LB
EFD4LB
EFD5LB
EFD6LB
EFD7LB
EFD8LB
EFD9LB
EFD10LB
EFD11LB
EFDPROXLB
E0BV
E1BV
E2BV
E3BV
E4BV
E5BV
E6BV
E7BV
E8BV
E9BV
E10BV
E11BV
EPROXBV
NCLR
FDLR
MHDR
NHDR
MHDF
NHDF
ELE1
ELE9
E1_OOR
E9_OOR
ELE0
ELE8
E0_OOR
E8_OOR
EFD0HB
EFD1HB
EFD2HB
EFD3HB
EFD4HB
EFD5HB
EFD6HB
EFD7HB
EFD8HB
EFD9HB
EFD10HB
EFD11HB
EFDPROXHB
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
Register
Address + 1
Sensors
Freescale Semiconductor, Inc.
MPR121
5

5 Page





MPR121QR2 arduino
5 Register Operation Descriptions
5.1 Register Read/Write Operations and Measurement Run/Stop Mode
After power on reset (POR) or soft reset by command, all registers are in reset default initial value (see Table 2). All the registers,
except registers 0x5C (default 0x10) and 0x5D (default 0x24), are cleared.
Registers 0x2B ~ 0x7F are control and configuration registers which need to be correctly configured before any capacitance
measurement and touch detection.
Registers 0x00 ~ 0x2A are output registers updating periodically by the MPR121 in Run Mode. Among these output registers,
Baseline Value Registers 0x1D ~ 0x2A are also writable, this is sometimes useful when user specific baseline values are desired.
The MPR121’s Run Mode and Stop Mode are controlled by control bits in Electrode Configuration Register (ECR, 0x5E). When
all ELEPROX_EN and ELE_EN bits are zeros, the MPR121 is in Stop Mode. While in Stop Mode, there are no capacitance or
touch detection measurement on any of the 13 channels. When any of the ELEPROX_EN and ELE_EN bits are set to ‘1’, the
MPR121 is in Run Mode. The MPR121 will continue to run on its own until it is set again to Stop Mode by the user.
The MPR121 registers read operation can be done at any time, either in Run Mode or in Stop Mode. However, the register write
operation can only be done in Stop Mode. The ECR (0x5E) and GPIO/LED control registers (0x73~0x7A) can be written at
anytime.
5.2 Touch Status Registers (0x00~0x01)
ELE0-ELE7 Touch Status (0x00)
Bit D7 D6 D5 D4 D3 D2 D1 D0
Read
ELE7
ELE6
ELE5
ELE4
ELE3
ELE4
ELE1
ELE0
Write
ELE8-ELE11 ELEPROX Touch Status (0x01)
Bit D7 D6 D5 D4 D3 D2 D1 D0
Read
OVCF
ELEPROX
ELE11
ELE10
ELE9
ELE8
Write
These two registers indicate the detected touch/release status of all of the 13 sensing input channels. ELEPROX is the status for
the 13th proximity detection channel. The update rate of these status bits will be {ESI x SFI}.
ELEx, ELEPROX: Touch or Release status bit of each respective channel (read only).
1, the respective channel is currently deemed as touched.
0, the respective channel is deemed as released.
Note: When an input is not configured as an electrode and enabled as GPIO input port, the corresponding status bit shows the
input level, but these GPIO status changes will not cause any IRQ interrupt. This feature is for ELE4~ELE11 only.
OVCF: Over Current Flag (read and write)
1, over current was detected on REXT pin.
0, normal condition.
When over current is detected, the OVCF is set to ‘1’ and the MPR121 goes to Stop Mode. All other bits in status registers
0x00~0x03, output registers 0x04~0x2A, and bits D5~D0 in ECR (0x5E) will also be cleared. When the bit is set at ‘1’, the write
to the ECR register to enter Run Mode will be discarded. The write to ’1’of the OVCF will clear this bit and the MPR121 fault
condition will be cleared. The MPR121 can then be configured to return to the Run Mode again.
Sensors
Freescale Semiconductor, Inc.
MPR121
11

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