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參數資料
| 型號： | KITMPR03XEVM |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 28/33頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR MPR03X |
| 產品培訓模塊： | MPR03x - Low-Power Proximity Sensors |
| 視頻文件： | KITMPR03XEVM |
| 標準包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 1.71 V ~ 2.75 V |
| 嵌入式： | 是，其它 |
| 已供物品： | 4 個板，線纜，CD，樣品 IC |
| 已用 IC / 零件： | MPR031 |
| 產品目錄頁面： | 2808 (CN2011-ZH PDF) |
| 相關產品： | MPR031EPR2DKR-ND - IC CTLR TOUCH SENSOR 8-DFN MPR031EPR2CT-ND - IC CTLR TOUCH SENSOR 8-DFN MPR031EPR2TR-ND - IC CTLR TOUCH SENSOR 8-DFN |
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MPR03X
Sensors
4
Freescale Semiconductor
Figure 4. Recommended System Connections Schematic
2.3
Serial Interface
The MPR03X 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 MPR03X 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 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 4.7k
, is required on
SDA. The MPR03X 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 MPR03X’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
2.3.2
Start and Stop Conditions
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.
Figure 6. Bit Transfer
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
DATA LINE STABLE
DATA VALID
CHANGE OF
DATA ALLOWED
SDA
SCL
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