參數(shù)資料
型號(hào)： KITMPR084EVM
廠商： Freescale Semiconductor
文件頁數(shù)： 36/40頁
文件大?。?/td> 0K
描述： KIT EVAL 8-PAD TOUCH MPR084
標(biāo)準(zhǔn)包裝： 1
傳感器類型： 觸摸，電容式
接口： I²C
電源電壓： 1.8 V ~ 3.6 V
嵌入式： 是，其它
已供物品： 板，纜線，CD
已用 IC / 零件： MPR084
產(chǎn)品目錄頁面： 2808 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： MPR084EJR2CT-ND - IC CTLR TOUCH SENSR PROX 16TSSOP
MPR084QR2-ND - IC CTLR TOUCH SENSOR PROX 16-QFN
MPR084Q-ND - IC CTLR TOUCH SENSOR PROX 16-QFN
MPR084EJR2TR-ND - IC CTLR TOUCH SENSR PROX 16TSSOP
MPR084EJ-ND - IC CTLR TOUCH SENSR PROX 16TSSOP
MPR084
Sensors
Freescale Semiconductor
5
The remaining 5 connections are SCL, SDA, IRQ, ATTN, and SOUNDER. Depending on the specific application, each of these
control lines can be used by connecting them to a host system. In the most minimal system, the SCL and SDA must be connected
to a master I2C interface to communicate with the MPR084. All of the connections for the MPR084 are shown by the schematic
Figure 4. Recommended System Connections Schematic
Note that in this configuration the AD0 address line is tied high thus the slave address of the MPR084 0x5D. Alternatively the
address line can be pulled low if the host system needs the MPR084 to be on address 0x5C. This functionality can also be used
to incorporate two MPR084 devices in the same system.
2.3
Serial Interface
The MPR084 uses an I2C Serial Interface. The I2C protocol implementation and the specifics of communicating with the Touch
Sensor Controller are detailed in the following sections.
2.3.1
Serial-Addressing
The MPR084 operates as a slave that sends and receives data through an I2C 2-wire interface. The interface uses a serial data
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 MPR084, and generates the SCL clock that synchronizes
the data transfer.
The MPR084 SDA line operates as both an input and an open-drain output. A pull-up resistor, typically 4.7k
, is required on SDA.
The MPR084 SCL line operates only as an input. A pull-up resistor, typically 4.7k
, 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 (Figure 5) sent by a master, followed by the MPR084’s 7-bit slave address plus
R/W bit, a register address byte, one or more data bytes, and finally a STOP condition.
Figure 5. Wire Serial Interface Timing Details
E1
E2
E3
E4
E5
E6
E7
E8
VDD
VSS
SCL
SDA
AD0
SOUNDER
ATTN
IRQ
1
4
3
2
5
8
7
6
16
13
14
15
12
9
10
11
780k
Ω
1
4
3
2
5
8
7
6
E1
E2
E3
E4
E5
E6
E7
E8
9 GND
GND
MPR084
SCL
SDA
SOUNDER
ATTN
IRQ
8-TOUCH
PAD
ELECTRODE
ARRAY
780k
Ω 780kΩ 780kΩ 780kΩ
780k
Ω 780kΩ 780kΩ
GND
1μF
4.7k
Ω
VDD
SCL
SDA
tLOW
tHIGH
tF
tR
tHD STA
tHD DAT
tHD STA
tSU DAT
tSU STA
tBUF
tSU STO
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
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