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AD7877ACP-REEL Datasheet(PDF) 7 Page - Analog Devices |
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AD7877ACP-REEL Datasheet(HTML) 7 Page - Analog Devices |
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7 / 44 page  AD7877 Rev. A | Page 7 of 44 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS NC 1 BAT2 2 BAT1 3 AUX3/GPIO3 4 AUX2/GPIO2 5 AUX1/GPIO1 6 VCC 7 NC 8 NC 24 DAV 23 ALERT 22 GPIO4 21 STOPACQ 20 DIN 19 CS 18 PENIRQ 17 32 31 30 29 28 27 26 25 9 10 11 12 13 14 15 16 NC = NO CONNECT AD7877 TOP VIEW (Not to Scale) Figure 4. Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 NC No Connect. 2 BAT2 Battery Monitor Input. ADC Input Channel 7. 3 BAT1 Battery Monitor Input. ADC Input Channel 6. 4 AUX3/GPIO3 Auxiliary Analog Input. ADC Input Channel 5. Can be reconfigured as GPIO pin. 5 AUX2/GPIO2 Auxiliary Analog Input. ADC Input Channel 4. Can be reconfigured as GPIO pin. 6 AUX1/GPIO1 Auxiliary Analog Input. ADC Input Channel 3. Can be reconfigured as GPIO pin. 7 VCC Power Supply Input. The VCC range for the AD7877 is from 2.2 V to 5.25 V. 8–9 NC No Connect. 10 X− Touch Screen Position Input. 11 Y− Touch Screen Position Input. ADC Input Channel 2. 12 X+ Touch Screen Position Input. ADC Input Channel 0. 13 Y+ Touch Screen Position Input. ADC Input Channel 1. 14 AGND Analog Ground. Ground reference point for all analog circuitry on the AD7877. All analog input signals and any external reference signal should be referred to this voltage. 15 DGND Digital Ground. Ground reference for all digital circuitry on the AD7877. All digital input signals should be referred to this voltage. 16, 32 NC No Connect. 17 PENIRQ Pen Interrupt. Digital active low output (has 50 kΩ internal pull-up resistor). 18 CS Chip Select Input. Active low logic input. This input provides the dual function of initiating conversions on the AD7877 and enabling the serial input/output register. 19 DIN SPI® Serial Data Input. Data to be written to the AD7877’s registers should be provided on this input and is clocked into the register on the rising edge of DCLK. 20 STOPACQ Stop Acquisition Pin. A signal applied to this pin can be monitored by the AD7877, so that acquisition of new data by the ADC is halted while the signal is active. Used to reduce the effect of noise from an LCD screen on the touch screen measurements. 21 GPIO4 Dedicated general-purpose logic input/output pin. 22 ALERT Digital Active Low Output. Interrupt output, which goes low if a GPIO data bit is set, or if the AUX1, TEMP1, BAT1, or BAT2 measurements are out of range. 23 DAV Data Available Output. Active low logic output. Asserts low when new data is available in the AD7877 results registers. This output is high impedance when CS is high. 24–25 NC No Connect. 26 DCLK External Clock Input. Logic input. DCLK provides the serial clock for accessing data from the part. 27 DOUT Serial Data Output. Logic output. The conversion result from the AD7877 is provided on this output as a serial data stream. The bits are clocked out on the falling edge of the DCLK input. This output is high impedance when CS is high. 28 VDRIVE Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial interface of the AD7877. |
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Similar Description - AD7877ACP-REEL |
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