MPR031EPR2 Freescale Semiconductor, MPR031EPR2 Datasheet - Page 4

• Manufacturer Part Number: MPR031EPR2
• Description: IC CTLR TOUCH SENSOR 8-DFN
• Manufacturer: Freescale Semiconductor
• Type: Capacitiver

Specifications of MPR031EPR2

• Touch Panel Interface: 2-Wire
• Data Interface: I²C, Serial
• Data Rate/sampling Rate (sps, Bps): 400k
• Voltage - Supply: 1.71 V ~ 2.75 V
• Current - Supply: 43µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-UDFN
• Output Type: Logic
• Interface: I²C
• Input Type: Logic
• Supply Voltage: 1.8 V
• Output Voltage: 0.5 V
• Supply Current: 8µA
• Ic Interface Type: I2C
• Supply Voltage Range: 1.71V To 2.75V
• Sensor Case Style: µDFN
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C
• Interface Type: I2C
• Rohs Compliant: Yes
• For Use With: KITMPR03XEVM - KIT EVAL FOR MPR03XDEMOMPR031 - BOARD DEMO FOR MPR031 CTLR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MPR031EPR2TR

MPR03X
4
2.3
The MPR03X uses an I
Sensor Controller are detailed in the following sections.
2.3.1
The MPR03X operates as a slave that sends and receives data through an I
Line (SDA) and a Serial Clock Line (SCL) to achieve bi-directional communication between master(s) and slave(s). A master
(typically a microcontroller) initiates all data transfers to and from the MPR03X, and it generates the SCL clock that synchronizes
the data transfer.
The MPR03X SDA line operates as both an input and an open-drain output. A pull-up resistor, typically 4.7kΩ, is required on
SDA. The MPR03X SCL line operates only as an input. A pull-up resistor, typically 4.7kΩ, is required on SCL if there are multiple
masters on the 2-wire interface, or if the master in a single-master system has an open-drain SCL output.
Each transmission consists of a START condition
R/W bit, a register address byte, one or more data bytes, and finally a STOP condition.
2.3.2
Both SCL and SDA remain high when the interface is not busy. A master signals the beginning of a transmission with a
START (S) condition by transitioning SDA from high to low while SCL is high. When the master has finished communicating with
the slave, it issues a STOP (P) condition by transitioning SDA from low to high while SCL is high. The bus is then free for another
transmission.
Serial Interface
Serial-Addressing
Start and Stop Conditions
SDA
SCL
t HD STA
SDA
SCL
CONDIT ION
ST ART
2
C Serial Interface. The I
t LOW
DATA LINE STABLE
t R
DATA VALID
t HIGH
t SU DAT
Figure 5. Wire Serial Interface Timing Details
t F
Figure 6. Start and Stop Conditions
t HD DAT
2
(Figure
C protocol implementation and the specifics of communicating with the Touch
5) sent by a master, followed by the MPR03X’s 7-bit slave address plus
DATA ALLOWED
t SU STA
CHANGE OF
REPEAT ED ST ART
CONDIT ION
2
C 2-wire interface. The interface uses a Serial Data
t HD STA
t SU STO
CONDIT ION
ST OP
Freescale Semiconductor
t BUF
CONDIT ION
ST ART
Sensors