參數(shù)資料
型號： MPR084Q
廠商： Freescale Semiconductor
文件頁數(shù)： 9/40頁
文件大?。?/td> 0K
描述： IC CTLR TOUCH SENSOR PROX 16-QFN
產(chǎn)品目錄繪圖： MPR08(3,4)Q Top
標(biāo)準(zhǔn)包裝： 490
類型： 電容性
輸入數(shù)/鍵： 8 鍵
評估套件： 可供
數(shù)據(jù)接口： I²C，串行
電源電壓： 1.8 V ~ 3.6 V
電流 - 電源： 1.62mA
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-VQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 16-QFN-EP（5x5）
包裝： 散裝
產(chǎn)品目錄頁面： 2808 (CN2011-ZH PDF)
配用： KITMPR084EVM-ND - KIT EVAL 8-PAD TOUCH MPR084
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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