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AD7877 数据表(PDF) 33 Page - Analog Devices |
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AD7877 数据表(HTML) 33 Page - Analog Devices |
33 / 46 page AD7877 Data Sheet Rev. E | Page 32 of 45 GROUNDING AND LAYOUT It is recommended that the ground pins, AGND and DGND, be shorted together as close as possible to the device itself on the user’s PCB. For more information on grounding and layout considerations for the AD7877, refer to the AN-577 Application Note, Layout and Grounding Recommendations for Touch Screen Digitizers. PCB DESIGN GUIDELINES FOR CHIP SCALE PACKAGES The lands on the chip scale package (CP-32) are rectangular. The printed circuit board pad for these should be 0.1 mm longer than the package land length and 0.05 mm wider than the package land width. To ensure that the solder joint size is maximized, center the land on the pad. The bottom of the chip scale package has a central thermal pad. The thermal pad on the printed circuit board should be at least as large as this exposed pad. On the printed circuit board, provide a clearance of at least 0.25 mm between the thermal pad and the inner edges of the pad pattern to ensure that shorting is avoided. Using thermal vias on the printed circuit board thermal pad improves the thermal performance of the package. If vias are used, incorporate them in the thermal pad at a 1.2 mm pitch grid. Keep the via diameter between 0.3 mm and 0.33 mm. The via barrel should be plated with 1 oz. copper to plug the via. The user should connect the printed circuit board thermal pad to AGND. HOST NC = NO CONNECT AD7877 24 NC 21 GPIO4 20 STOPACQ 19 DIN 17 PENIRQ 18 CS 22 ALERT 23 DAV NC 1 BAT2 2 BAT1 3 AUX3/GPIO3 4 AUX2/GPIO2 5 AUX1/GPIO1 6 VCC 7 NC 8 32 31 30 29 28 27 26 25 9 10 11 12 13 14 15 16 INT1 INT2 SCLK MISO MOSI PENIRQ CS GPIO HSYNC SIGNAL FROM LCD VCC RRNG 0.1 F DC-DC CONVERTER VIN OUT FB TO LCD BACKLIGHT TOUCH SCREEN 0.1 F 1.0 F–10F (OPTIONAL) VOLTAGE REGULATOR TEMPERATURE MEASUREMENT DIODE MAIN BATTERY SECONDARY BATTERY FROM AUDIO REMOTE CONTROL FROM HOTSYNC INPUTS Figure 48. Typical Application Circuit |
类似零件编号 - AD7877_17 |
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类似说明 - AD7877_17 |
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