参数资料
| 型号： | P0307 |
| 厂商： | Terasic Technologies Inc |
| 文件页数： | 15/39页 |
| 文件大小： | 0K |
| 描述： | KIT DEV 4.3" LCD TOUCH PANEL |
| 标准包装： | 1 |
| 附件类型： | NTSC/PAL TV 播放器 |
| 适用于相关产品： | DE2，DE1 |
| 产品目录页面： | 607 (CN2011-ZH PDF) |
| 相关产品： | P0528-ND - BOARD DEV DE1 ALTERA P0304-ND - DE2-70 CALL FOR ACADEMIC PRICING P0301-ND - DE2 CALL FOR ACADEMIC PRICING |
| 其它名称： | TRDB_LTM |
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Using the LTM
3-3 The serial interface of the AD converter
This section will describe how to obtain the X/Y coordinates of the touch point from the AD converter.
The LTM also equipped with an Analog Devices AD7843 touch screen digitizer chip. The AD7843 is a
12-bit analog to digital converter (ADC) for digitizing x and y coordinates of touch points applied to the touch
screen. The coordinates of the touch point stored in the AD7843 can be obtained by the serial port interface.
To obtain the coordinate from the ADC, the first thing users need to do is monitor the interrupt signal
ADC_PENIRQ_n outputted from the ADC. By connecting a pull high resistor, the ADC_PENIRQ_n output
remains high normally. When the touch screen connected to the ADC is touched via a pen or finger, the
ADC_PENIRQ_n output goes low, initiating an interrupt to a FPGA that can then instruct a control word to be
written to the ADC via the serial port interface.
The control word provided to the ADC via the DIN pin is shown in Table 3.5. This provides the conversion
start, channel addressing, ADC conversion resolution, configuration, and power-down of the ADC. The
detailed information on the order and description of these control bits can be found from the datasheet of the
ADC in the DATASHEET folder on the LTM System CD-ROM.
MSB
LSB
S
A2
A1
A0
MODE
S E R
/
D E F
PD1
PD0
Bit
7
Mnemonic
S
Comment
Start Bit. The control word starts with the first high bit on DIN. A
new control word can start every 15th DCLK cycle when in the
12-bit conversion mode, or every 11th DCLK cycle when in 8-bit
conversion mode.
Channel Select Bits. These three address bits, along with the
6-4
A2-A0
S E R
/
D E F
bit, control the setting of the multiplexer input,
switches, and reference inputs.
12-Bit/8-Bit Conversion Select Bit. This bit controls the resolution
of the following conversion. With 0 in this bit, the
3
MODE
conversion has a 12-bit resolution, or with 1 in this bit, the
conversion has a 8-bit resolution.
Single-Ended/Differential Reference Select Bit. Along with Bits
2
S E R
/
D E F
A2– A0, this bit controls the setting of the multiplexer
input, switches, and reference inputs.
Power Management Bits. These two bits decode the power-down
1,0
PD1,PD0
mode of the AD7843.
13
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| P0308 | 功能描述:BOARD ADAPTER HMSC TO GPIO RoHS:是 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| P0309 | 制造商:Terasic 功能描述:HSMC SANTA CRUZ CONVERSION CARD |
| P030KBKF | 制造商:Hammond Power Solutions 功能描述:Transformer, encapsulated, Nema 3R enclosure, 480V input, 208Y/120V out, 30kVA |
| P030QKKF | 制造商:Hammond Power Solutions 功能描述:TRANSFORMER, 3PH N3R 30KVA 600-480 制造商:Hammond Power Solutions 功能描述:POTTED 3PH N3R CU CLASS 1, DIV II 30kVA 600-480 |
| P0311 | 制造商:TE Connectivity 功能描述:Conn NEMA 2 POS 19.05mm Screw ST Cable Mount 25A/Contact |
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