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參數(shù)資料
| 型號： | TSC2101IRGZRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | GREEN, PLASTIC, VQFN-48 |
| 文件頁數(shù)： | 32/95頁 |
| 文件大小： | 1217K |
| 代理商： | TSC2101IRGZRG4 |
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TSC2101
SLAS392D JUNE 2003 REVISED MAY 2005
www.ti.com
38
Table 4. Programmable PINTDAV Functionality
D15D14
PINTDAV FUNCTION
00
Acts as PEN interrupt (active low) only. When PEN touch is detected, PINTDAV goes low.
01
Acts as data available (active low) only. The PINTDAV goes low as soon as one set of ADC conversions are completed for data
of X,Y, XYZ, battery input, or auxiliary input selected by D13D10 in control register 00H/Page 1. The resulting ADC output is stored
in the appropriate registers. The PINTDAV remains low and goes high only after this complete set of registers selected by D13D10
in control register 00H/Page 1 is read out.
10
11
Acts as both PEN interrupt and data available. When PEN touch is detected, PINTDAV goes low and remains low. The PINTDAV
goes high only after one set of A/D conversions is completed for data of X,Y, XYZ, battery input, or auxiliary input selected by
D13D10 in control register 00H/Page 1.
NOTE: See the section, Conversion Time Calculations for the TSC2101 in this data sheet for the timing diagrams.
Pen-touch detect circuit is disabled during hardware power down.
Touch Screen Measurements
The touch screen ADC can be either controlled by the host processor or can be selfcontrolled to offload
processing from the host processor. Bit D12 of control register 01H/Page 1 sets the control mode of the
TSC2101 touch screen ADC.
Conversion Controlled by the TSC2101 Initiated at Touch Detect
In this mode, the TSC2101 detects when the touch panel is touched and causes the PINTDAV line to go low.
At the same time, the TSC2101 starts up its internal clock. Assuming the part was configured to convert XY
coordinates, it then turns on the Y drivers, and after a programmed panel voltage stabilization time, powers up
the ADC and converts the Y coordinate. If averaging is selected, several conversions may take place; when
data averaging is complete, the Y coordinate result is stored in the Y register.
If the screen is still touched at this time, the X drivers are enabled, and the process repeats, but measuring
instead the X coordinate, storing the result in the X register.
If only X and Y coordinates are to be measured, then the conversion process is complete. The time it takes to
complete this process depends upon the selected resolution, internal conversion clock rate, averaging selected,
panel voltage stabilization time, and precharge and sense times.
If the pressure of the touch is also to be measured, the process continues in the same way, measuring the Z1
and Z2 values, and placing them in the Z1 and Z2 registers. As before, this process time depends upon the
settings described above.
See the section Conversion Time Calculation for the TSC2101 in this data sheet for timing diagrams and
conversion time calculations.
Conversion Controlled by the TSC2101 Initiated by the Host
In this mode, the TSC2101 detects when the touch panel is touched and causes the PINTDAV line to go low.
The host recognizes the interrupt request, and then writes to the ADC control register (D13D10 of control
register 00H/Page 1) to select one of the touch screen scan functions. The host can either choose to initiate
one of the scan functions, in which case the TSC2101 controls the driver turnon and wait times (e.g. upon
receiving the interrupt the host can initiate the continuous scan function XYZ1Z2 after which the TSC2101
controls the rest of conversion). The host can also choose to control each aspect of conversion by controlling
the driver turn-on and start of conversions. For example, upon receiving the interrupt request, the host turns
on the X drivers. After waiting for the settling time, the host then addresses the TSC2101 again, this time
requesting an X coordinate conversion, and so on.
The main difference between this mode and the previous mode is that the host, not the TSC2101, controls the
touch screen scan functions.
See the section Conversion Time Calculation for the TSC2101 in this data sheet for timing diagrams and
conversion time calculations.
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