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| 型號： | KITMPR084EVM |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 38/40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 |
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MPR084
Sensors
Freescale Semiconductor
7
2.3.5
The Slave Address
The MPR084 has a 7-bit long slave address (Figure 9). The bit following the 7-bit slave address (bit eight) is the R/W bit, which
is low for a write command and high for a read command.
Figure 9. Slave Address Transaction
The MPR084 monitors the bus continuously, waiting for a START condition followed by its slave address. When a MPR084
recognizes its slave address, it acknowledges and is then ready for continued communication.
2.3.6
Message Format for Writing the MPR084
A write to the MPR084 comprises the transmission of the MPR084’s keyscan slave address with the R/W bit set to 0, followed
by at least one byte of information. The first byte of information is the command byte. The command byte determines which
register of the MPR084 is to be written by the next byte, if received. If a STOP condition is detected after the command byte is
received, then the MPR084 takes no further action (Figure 10) beyond storing the command byte. Any bytes received after the
command byte are data bytes.
Figure 10. Command Byte Received
Any bytes received after the command byte are data bytes. The first data byte goes into the internal register of the MPR084
selected by the command byte (Figure 11).
Figure 11. Command and Single Data Byte Received
If multiple data bytes are transmitted before a STOP condition is detected, these bytes are generally stored in subsequent
MPR084 internal registers because the command byte address generally auto-increments (Section 2.4).
2.3.7
Message Format for Reading the MPR084
The MPR084 is read using the MPR084’s internally stored command byte as address pointer, the same way the stored command
byte is used as address pointer for a write. The pointer generally auto-increments after each data byte is read using the same
rules as for a write (Section 6.4.1). Thus, a read is initiated by first configuring the MPR084’s command byte by performing a write
(Figure 12). The master can now read ‘n’ consecutive bytes from the MPR084, with the first data byte being read from the register
addressed by the initialized command byte.
Slave address: 0x5C
SAA
P
0
SLAVE ADDRESS
COMMAND BYTE
acknowledge from MPR084
R/W
acknowledge from MPR084
D7
D6
D5
D4
D3
D2 D1
D0
Commandbyte is storedonreceipt ofSTOP condition
SA
AA
P
0
SLAVE ADDRESS
COMMAND BYTE
DATA BYTE
acknowledge from MPR084
R/W
1byte
auto-increment memory
word address
D15 D14 D13 D12 D11 D10 D9 D8
D1 D0
D3 D2
D5 D4
D7 D6
Howcommand byte and data byte
map into MPR084's registers
acknowledge from
MPR084
acknowledge from
MPR084
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