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參數(shù)資料
| 型號： | MPR081QR2 |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, QCC16 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大小： | 324K |
| 代理商： | MPR081QR2 |
MPR081
Sensors
6
Freescale Semiconductor
DETAILED DESCRIPTION
FUNCTIONAL OVERVIEW
The MPR081user interface controller monitors various
combinations of capacitive touch pads, capacitive sliders,
capacitive rotaries, and mechanical keys. The device
includes a piezo buzzer driver which generates key click
sounds to provide audible feedback of pad touches and/or
key presses. The MPR081 also uses a standardized user
register set to configure the part on power up, and to read
pad, slider and key status. The commonality between
products in the MPR08 family of controllers simplifies
migration between parts.
A quick word on terminology:
–
A mechanical keyswitch is a switch containing, at its
simplest, two contacts which have either a high (>10 M
Ω)
or a low resistance (<10 k
Ω) between them depending on
switch position. Momentary push switches normally are
low resistance when pressed. Latching switches (such as
slide switches) provide high resistance in one position,
low resistance in the other.
–
A capacitive touch pad is a contactless 'key' which
detects the presence or absence of a finger. The raw
detection output is a single bit giving touch condition.
–
A capacitive rotary is a group of touch pads arranged in
a ring for which not only the presence or absence of a
finger is detected, but also the position of a finger along
the circumference of the rotary.
–
A capacitive slider is an elongated touch pad for which
not only the presence or absence of a finger is detected,
but also the position of a finger along the length of the
slider. The raw detection output is a single bit giving touch
condition, plus a multi-bit word for position. A typical
application is a volume control, where one end of the
slider corresponds to minimum volume and the other end
to maximum.
–A full pad is a touch pad whose conductive area is
connected to one electrode of the touch controller and
ground.
–A split pad is a touch pad whose conductive area is
connected to more than one electrode of the touch
controller. For the MPR08 family, a split pad is always
connected to two electrodes and typically looks like a pair
of interlaced fingers.
–A pad array is a collection of full and split pads
interconnected to each other and a number of electrode
lines. The number of pads available in a pad array with N
electrode lines using full and two-electrode split pads is
sum(1 to N), made up of N full pads and sum(1 to (N-1))
split pads. The MPR082 uses two sets of 4 electrode lines
and, therefore, each 4-electrode pad array has a
capability of 4 full pads and sum(1 to 3) or 1+2+3 = 6 split
pads, and a total pad count of sum(1 to 4) or 1+2+3+4 =
10 full plus split pads.
–
A pad array with n key lockout will only report one touch
at a time. Multiple simultaneous touches are ignored.
–
A pad array with 2 key rollover ignores further pads after
touching a first pad. If a pad is touched and held, and then
a second pad is touched, the second pad is ignored. If the
first pad is released while the second pad is still touched,
then the second pad will be reported as a new touch.
–
A pad array with n-key rollover allows any number of
pads will be detected as pressed in succession or
simultaneously without requiring any previous pads to be
released first.
Table 7. MPR08 Family Overview
Product
Bus
Sounder
Rotary Slider
Touch Pad Array
Main Attribute
MPR081
I2C with RST
Yes
16-Positions
—
Highest resolution rotary
MPR082
I2C with RST
Yes
—
20 Pads(1)
1. The 20 pads are implemented by two independent arrays of 10 touch pads.
Two independent arrays of 10 touch pads
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相關(guān)代理商/技術(shù)參數(shù) |
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| MPR082EJ | 制造商:Freescale Semiconductor 功能描述:20 PADS - Bulk |
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| MPR083 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Blood Pressure Monitor Using the Flexis QE128 Family |
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