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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)： | 2/22頁 |
| 文件大小： | 324K |
| 代理商： | MPR081QR2 |
MPR081
Sensors
10
Freescale Semiconductor
INTERRUPT CONTROLLER AND IRQ OUTPUT
The IRQ pin is an open-drain, latching interrupt output
which automatically alerts changes to a user-configurable
combination of keyswitches and/or touch pads. IRQ requires
an external pullup resistor, which can be connected to any
voltage up to VDD. When set active low, IRQ is reset high
immediately after the slave address acknowledge of the first
subsequent read or write access to the MPR081. If an
interrupt causing event occurs during an I2C transmission to
the MPR081, the interrupt is not asserted. Instead, it is
asserted after the I2C transmission is terminated (by a STOP
condition or a repeated START condition), but only if the
affected registers were not read during the I2C
communication. This avoids unnecessary assertion of the
interrupt.
An interrupt can be enabled for:
Initial touch (when rotary condition goes from
untouched to touched)
Touch release
ROTARY TOUCH INTERFACE
The rotary interface has to distinguish touch status through
varying user conditions (different finger sizes in bare hands or
gloves) and environmental conditions (electrical and RF
noise, sensor contamination with dirt or moisture). The rotary
circuitry reports status as one of five conditions: rotary
untouched, and rotary touched in one of four positions.
Normally, the rotary is only touched in one position, ideally
near the middle of one of the four pads. If a touch occurs
more or less between pads, either the nearest pad will be
given or the touch will be ignored depending on exact touch
position and finger size. The rotary circuitry interprets multiple
simultaneous rotary touches (more than one rotary pad being
touched at the same time) as best it can. The scenarios are
as follows:
1.
Two rotary pads touched at the same time
If the two touched rotary pads are both full or both
split, the touches are ignored until one is removed
If one touched rotary pad is full and the other touched
rotary pad is split, the full pad position will be reported.
If the full pad touch is removed first, the split pad
position now will be reported.
2.
First one rotary pad is touched and held, then a second
rotary pad is touched and held.
The second touch will be ignored and the first touch
will continue to be active. If the first touch is removed
while the second pad is still being touched, then the
second pad becomes the only touched pad and so is
reported.
Table 8. Register Address Map
Register
Register Address
Register
Address
Auto-Increment
Address
Auto-Increment Loop
D15 D14 D13 D12 D11 D10
D9
D8
FIFO
0
0x00
FIFO
Fault
0
1
0x01
0x02
Rotary Status
0
1
0
0x02
0x00
FIFO
Rotary Configuration
0
1
0x03
0x04
Sensitivity
0
1
0
1
0x04
0x05
Master Tick Counter
0
1
0
0x05
0x06
Touch Acquisition Sample Rate
0
1
0x06
0x07
Sounder
0
1
0
0x07
0x08
Sleep Period
0
1
0
1
0x08
0x09
Configuration
0
1
0
1
0
0x09
0x00
FIFO
Table 9. Power-Up Register Configurations
Register Function
Power-Up Condition
Register
Address
Register Data
D7
D6
D5
D4
D3
D2
D1
D0
FIFO
FIFO is empty
0x00
0
Fault
No faults
0x01
0
Rotary Status
Rotary is untouched
0x02
0
Rotary Configuration
Rotary is enabled, without interrupts, with
sounder enabled
0x03
1
0
1
Sensitivity
Level is very sensitive
0x04
0
Master Tick Counter
Master tick period is 10 ms
0x05
0
1
0
1
Touch Acquisition Sample Rate Touch acquisition sample rate is 5 master
tick periods
0x06
0
1
0
Sounder
Sounder is globally enabled, 10 ms of 1 kHz
0x07
0
1
Sleep Period
Sleep mode is disabled
0x08
0
Configuration
Shutdown mode. IRQ is disabled
0x09
0
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