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TSC2100
SLAS378 NOVEMBER 2003
www.ti.com
21
Touch Screen Measurements
The touch screen ADC can be controlled by the host processor or can be selfcontrolled to offload processing from the
host processor. Bit D15 of REG00H/Page1 sets the control mode of the TSC2100 touch screen ADC.
Conversion Controlled by TSC2100 Initiated at Touch Detect
In this mode, the TSC2100 detects when the touch panel is touched and causes the PINTDAV line to go low. At the same
time, the TSC2100 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 TSC2100 in this data sheet for timing diagrams and conversion time
calculations.
Conversion Controlled by TSC2100 Initiated by the Host
In this mode, the TSC2100 detects when the touch panel is touched and causes the pen-interrupt signal line to go low. The
host recognizes the interrupt request, and then writes to the ADC control register (D13D10 REG00H/Page1) 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
TSC2100 controls the driver turnons, and wait times (e.g. upon receiving the interrupt the host can initiate the continuous
scan function XYZ1Z2 after which the TSC2100 controls the rest of conversion). The host can also choose to control
each aspect of conversion by controlling the driver turnons 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 TSC2100
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 TSC2100, controls the touch screen
scan functions.
See the section Conversion Time Calculation for the TSC2100 in this data sheet for timing diagrams and conversion time
calculations.
Temperature Measurement
In some applications, such as battery recharging, a measurement of ambient temperature is required. The temperature
measurement technique used in the TSC2100 relies on the characteristics of a semiconductor junction operating at a fixed
current level. The forward diode voltage (VBE) has a well-defined characteristic versus temperature. The ambient
temperature can be predicted in applications by knowing the 25°C value of the VBE voltage and then monitoring the delta
of that voltage as the temperature changes.
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| TSC2100IRHBR | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| TSC2100IRHB | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| TSC2100IDAG4 | SPECIALTY CONSUMER CIRCUIT, PDSO32 |
| TSC2100IRHBG4 | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| TSC2100IRHBRG4 | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2100IDAG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IDAR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IDARG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHB | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHBG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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