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AD7879 Arkusz danych(PDF) 8 Page - Analog Devices |
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AD7879 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 40 page AD7879/AD7889 Data Sheet Rev. D | Page 8 of 40 Y+ NIC NIC X– NIC NIC DOUT PENIRQ/INT/DAV NOTES 1. NIC = NO INTERNAL CONNECTION. 2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE. 12 11 10 1 3 4 9 2 AD7879 TOP VIEW (Not to Scale) Figure 7. AD7879 LFCSP Pin Configuration Y+ NIC NIC X– NIC NIC SDA PENIRQ/INT/DAV NOTES 1. NIC = NO INTERNAL CONNECTION. 2. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE. 12 11 10 1 3 4 9 2 (Not to Scale) AD7879-1 TOP VIEW Figure 8. AD7879-1 LFCSP Pin Configuration Table 7. LFCSP Pin Function Descriptions Pin No. Mnemonic Description AD7879 AD7879-1 1 1 Y+ Touch Screen Input Channel. 2, 3, 10, 11 2, 3, 10, 11 NIC No Internal Connection. 4 4 X− Touch Screen Input Channel. 5 5 Y− Touch Screen Input Channel. 6 Not applicable DIN SPI Serial Data Input to the AD7879. Not applicable 6 ADD1 I2C Address Bit 1 for the AD7879-1. Tie this pin high or low to determine an address for the AD7879-1 (see Table 25). 7 7 GND Ground. This pin is the ground reference point for all circuitry on the AD7879. Refer all analog input signals and any external reference signal to this voltage. 8 8 SCL Serial Interface Clock Input. 9 Not applicable DOUT SPI Serial Data Output for the AD7879. Not applicable 9 SDA I2C Serial Data Input and Output for the AD7879-1. 12 12 PENIRQ/INT/DAV Interrupt Output. This pin is asserted when the screen is touched (PENIRQ), when a measurement exceeds the preprogrammed limits (INT), or when new data is available in the registers (DAV). This pin is active low and has an internal 50 kΩ pull-up resistor. 13 13 AUX/VBAT/GPIO This pin can be programmed as an auxiliary input to the ADC (AUX), as a battery measurement input to the ADC (VBAT), or as a GPIO. 14 Not applicable CS Chip Select for the SPI Serial Interface on the AD7879/AD7889. This pin is active low. Not applicable 14 ADD0 I2C Address Bit 0 for the AD7879-1/AD7889-1. Tie this pin high or low to determine an address for the AD7879-1/AD7889-1 (see Table 25). 15 15 VCC/REF Power Supply Input and ADC Reference. 16 16 X+ Touch Screen Input Channel. EP Exposed Pad. The exposed pad is not connected internally. For increased reliability of the solder joints and maximum thermal capability, it is recommended that the pad be soldered to the ground plane. |
Podobny numer części - AD7879_17 |
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Podobny opis - AD7879_17 |
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