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| 型号： | MPR084QR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 39/40页 |
| 文件大小： | 0K |
| 描述： | IC CTLR TOUCH SENSOR PROX 16-QFN |
| 标准包装： | 2,500 |
| 类型： | 电容性 |
| 输入数/键： | 8 键 |
| 评估套件： | 可供 |
| 数据接口： | I²C，串行 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 电流 - 电源： | 1.62mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 配用： | KITMPR084EVM-ND - KIT EVAL 8-PAD TOUCH MPR084 |
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MPR084
Sensors
8
Freescale Semiconductor
When performing read-after-write verification, remember to re-set the command byte’s address because the stored command
byte address will generally have been auto-incremented after the write (Section 2.4).
Figure 12. ‘n’ Data Bytes Received
2.3.8
Operation with Multiple Master
The application should use repeated starts to address the MPR084 to avoid bus confusion between I2C masters.On a I2C bus,
once a master issues a start/repeated start condition, that master owns the bus until a stop condition occurs. If a master that does
not own the bus attempts to take control of that bus, then improper addressing may occur. An address may always be rewritten
to fix this problem. Follow I2C protocol for multiple master configurations.
2.3.9
Device Reset
The RST is an active-low software reset. This is implemented in the Configuration Register by activating the RST bit. When
asserted, the device clears any transaction to or from the MPR084 on the serial interface and configures the internal registers to
the same state as a power-up reset (Table 4). The MPR084 then waits for a START condition on the serial interface.
The sensor controller is capable of operating down to 1.8 V, however, in order for the sensor controller to exit reset and startup
correctly the host system must initially provide 2.0 V to 3.6 V input to VDD and then follow the process in Figure 13. This process
is required in applications that require regulated operation in the 1.8 V to 2.0 V range. In the case that the application uses an
unregulated battery, then the battery must initially provide at least 2.0 V to correctly power-up the sensor controller which limits
battery selection to the 2.0 V to 3.6 V range.
Figure 13. Low Voltage (1.8 V - 2.0 V) Power-up Sequence
SAAA P
1
SLAVE ADDRESS
COMMAND BYTE
DATA BYTE
acknowledge from MPR084
R/W
nbytes
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
Established Comms with
Sensor Controller?
i.e. Read from FIFO
Is Data valid? (0 x 40)
Idle Delay Loop
Apply 2.0V to VDD Max
To Sensor Controller
Lower VDD to the desired operating voltage
1.8 V to 2.0 V
False
True
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