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| 型号： | MPR084EJR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 7/40页 |
| 文件大小： | 0K |
| 描述： | IC CTLR TOUCH SENSR PROX 16TSSOP |
| 标准包装： | 1 |
| 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-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 剪切带 (CT) |
| 配用： | KITMPR084EVM-ND - KIT EVAL 8-PAD TOUCH MPR084 |
| 其它名称： | MPR084EJR2CT |
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MPR084
Sensors
Freescale Semiconductor
15
4.3
Run1 Mode
When in Run1 mode the sensor controller will run continuously. During Run1 all the modules are synchronized by the Master Tick
Period. This value can be set by using the Master Tick Period Register as outlined in the following section.
While in this mode all functionality of the MPR084 is enabled; touch detection will occur, and I2C communication will be available.
This mode is enabled by setting the Configuration Register’s RUNE and DCE bits high.
4.3.1
Master Tick Period Register
The Master Tick Period Register is used to set the master tick of this system. All parts of the system are synchronized to this
counter. This register is overridden in all modes except for Run1. When not in Run1 mode, the value of this register is ignored
and 8ms is used for the primary clock. The I2C slave address of the Master Tick Period Register is 0x0E.
Figure 18. Master Tick Period Register
4.4
Run2 Mode
When in Run2 mode the sensor controller will continue to scan the electrodes but a low power state will be enabled between
each cycle. Because of this, any I2C communication that occurs, may or may not respond while the sensor is in this mode
If DCE is enabled the sensor controller transitions between low power and active states. During the active part of the cycle
communication with the sensor controller is possible; however, Freescale always requires users to issue an ATTN signal prior to
initiating communications. Accessing the I2C interface while DCE mode is enabled without sending an ATTN signal first is likely
to produce invalid data.
This mode is enabled by setting the Configuration Register’s RUNE bit high and DCE bit low. The only way to exit this mode is
to toggle the Attention Pin, refer to Section 4.7.
4.5
Stop1 Mode
When in Stop1 mode the sensor controller will not scan the electrodes. While capacitance sensing is disabled I2C
communications will still be accepted and the sensor controller will maintain instantaneous response to all register requests. This
is the only mode in which register values can be set.
This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit high.
4.6
Stop2 Mode
When in Stop2 mode the sensor controller will not scan the electrodes or accept I2C communication. The MPR084 is off during
this mode.
This mode is enabled by setting the Configuration Register’s RUNE bit low and DCE bit low. The only way to exit this mode is to
toggle the Attention Pin, refer to Section 4.7.
7
6
543210
R
MTP
W
Reset:
0
000101
= Unimplemented
Table 10. Master Tick Period Register Field Descriptions
Field
Description
7:0
MTP
Master Tick Period – The Master Tick Period selects or reports the current value of the
touch sensor controller’s primary clock. The resulting period must be in the range 5ms
to 31ms. If the value is outside of this range the MTP will be set to 00011010.
00000000 Encoding 0 – Sets the primary clock multiplier to 5
~
00011010 Encoding 26 - Sets the primary clock multiplier to 31
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