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參數(shù)資料
| 型號： | P95020NQG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
| 封裝： | 10 X 10 MM, 0.85 MM HEIGHT, QFN-132 |
| 文件頁數(shù)： | 21/169頁 |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
117
2011 Integrated Device Technology, Inc.
ADC and TSC Module – Operation
The ADC and TSC module comprises of the following
functions:
-
4-wire touch screen controller
-
General purpose analog signal measurement
-
On-die temperature and voltage monitoring, including
low voltage and high temperature detectors
ADC_TSC_EN and clock generator PLL (0xA034[2:0]
default value is 00b, PLL off) need to be enabled to
activate the ADC and TSC functions. Since the ADC and
Reference voltage are powered-on only when a
measurement is scheduled, the power consumption will be
low if there are no frequent measurements required.
The A/D converter is limited to 12-bit resolution, the
conversion clock is 1MHz and conversion takes 12 clock
cycles. A 2MHz clock is supplied from an external crystal
through the PLL.
Touch Screen Mode
In this mode, pin GPIO6/7/8/9 are connected to pins X-/Y-
/Y+/X+ of a 4 wire resistive touch screen. The pen-down
detection circuit will be active automatically. When the
screen is touched, the pen-down detects the event and
asserts the PENDOWN signal (mapped to GPIO1) to
notify the processor. The PENDOWN event can also (if
programmed) trigger the processor interrupt via the
interrupt signal (mapped to GPIO5) of the chip. The touch
screen controller operates in master measurement mode.
When touched, the controller will automatically initiate the
X, Y (and Z1, Z2 if configured) measurement when the
pen-down status is detected. After the conversion is
complete, the result is stored into result registers and the
pen-down detection circuit will be available. Measurement
will restart automatically as long as the pen-down 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.
Also, in the touch screen mode, RESULTS_CH1 to
RESULTS_CH4 reflect one measurement result. This is
for the case when and the registers are updated while
reading the data. To achieve data coherency, when the
RESULTS_CH1’s LSB is read, all the RESULTS_CH1 to
RESULTS_CH4 will be read to a shadow buffer and then
read out in the sequence I2C read.
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 the 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 50K 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.
Figure 38. Pen-down Detection Function Block Diagram
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