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参数资料
| 型号： | KITMPR084EVM |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 9/40页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL 8-PAD TOUCH MPR084 |
| 标准包装： | 1 |
| 传感器类型： | 触摸，电容式 |
| 接口： | I²C |
| 电源电压： | 1.8 V ~ 3.6 V |
| 嵌入式： | 是，其它 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | MPR084 |
| 产品目录页面： | 2808 (CN2011-ZH PDF) |
| 相关产品： | 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
17
5
Low Power Configuration
5.1
Introduction
The MPR084 features a Low Power mode that can reduce the power consumption into the microamps range. This feature can
be used to both adjust the response time of the system, and change the conditions on which Low Power would be enabled.
5.2
Operation
This Low Power configuration is only active when the sensor controller is in Run2 mode. The Low Power mode decreases current
consumption by increasing the response time of the MPR084. This increase is controlled through two factors.
During normal Run2 operation of the sensor controller the Max Response Time (MRT) is calculated by taking the product of the
TASP and the primary clock. From Chapter 4 the primary clock is the (MTP + 5) ms. Since the sensor controller is in Run2, the
primary clock is also multiplied by a factor of 8. The debounce rate of the MPR084 is 4 times the sample rate thus the MRT is
represented by the following equation.
Equation 1
First, the Idle Interface Timeout (IIT) represents the total time the touch interface should remain idle before going into Low Power
mode. This value can be calculated by taking the product of the ITP, TASP and primary clock (8ms) with a factor of 64. Thus the
IIT is represented as follows:
Equation 2
Second, the Max Response Time (MRT) represents the total time the touch interface should remain inactive before scanning the
electrodes. This value can be calculated by taking the product of the SCD, TASP and primary clock (8ms) with a factor of 5. Thus
the MRT is represented as follows:
Equation 3
When in Run2 mode, the sensor controller will initially scan the electrodes at the rate of MRT1. When scanning at MRT1 and the
touch interface remains idle for the IIT period then the scan period will change to MRT2. When scanning at MRT2 and a touch is
detected the scan rate will transition back to MRT1.
Figure 20. Low Power Scan Period Transition Diagram
5.3
Configuration
Low Power Configuration is achieved through setting two values; the Idle Timeout Period and the Sleep Cycle Duration. This
functionality is described in the following section.
MRT1
MTP
5
+
8
----------------------
1
+
TASP
48ms
=
MRT2
MTP
5
+
8
----------------------
1
+
TASP
SCD
48
ms
=
ITT
MTP
5
+
8
----------------------
1
+
TASP
ITP
68ms
=
LP DISABLED
ITT PERIOD
run2 SET
TOUCH DETECTED
MRT1
MRT2
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