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參數(shù)資料
| 型號： | P95020ZLLG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124 |
| 封裝： | LLGA-124 |
| 文件頁數(shù)： | 136/137頁 |
| 文件大?。?/td> | 3533K |
| 代理商： | P95020ZLLG |
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P95020 / Preliminary Datasheet
Revision 0.7.10
98
2010 Integrated Device Technology, Inc.
status is still valid. The PENDOWN (GPIO1) pin will be asserted whenever there is a valid measurement result stored in
the X/Y/Z1/Z2 register. It will be kept asserted until pendown status is not valid.
In the touch screen mode, the other internal monitoring channels (BAT, TEMP,VSYS and ICHRG) are still active for
measurement when the panel is not touched.
PEN-DOWN DETECTION
The pen-down detection circuit is only active in touch screen mode and is automatic (H/W autonomous). The detection
circuit is deactivated during measurements and reactivated after each measurement is completed to continue monitoring
the pen-down status. When touch screen detection is enabled, the Y- driver is ON and connected to GND and the X+ pin
is internally pulled to VDD through a
50KΩ resister. When the touch screen is touched, the X+ pin is pulled to GND
through the touch screen and PENDOWN goes high. The system will wait the amount of time defined by
PENDOWN_TIMER in the TSC Configuration Register to determine if the pen-down event is valid. If the pen-down event
is valid, an X/Y/Z1/Z2 measurement will begin.
Y+
X+
Y-
OPEN CIRCUIT
ON
PEN DETECT
ENABLE
VDD
50Kohm
PENDOWN
TOUCH
SCREEN
Control
logic
PEN-DOWN DETECTION Function Block Diagram.
TSC
– MEASURING TOUCH SCREEN LOCATION (X/Y)
When a PENDOWN valid event occurs the touch screen controller will automatically initiate an X/Y location measurement.
Each measurement can be configured to be done 2
AVERAGE_SEL_TSC times (as defined in the Average Timer Select Register)
and then averaged. The results of the averaged conversions will then be stored into the Result Registers provided the
PENDOWN status remains valid througout a user-defined time (PENUP_TIMER). X/Y measurements will continue to be
made as long as the PENDOWN status remains valid. Each successive X/Y result will overwrite the previous location
written to the X Measurement and Y Measurement Result Registers.
ADC
X+
X-
Y-
Y+
GND
REF-
REF+
VDD
ADC
Y+
Y-
X-
X+
GND
REF-
REF+
VDD
R-touch
Measure X-Position
Measure Y-Position
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