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AD7142 Datasheet(PDF) 9 Page - Analog Devices |
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AD7142 Datasheet(HTML) 9 Page - Analog Devices |
9 / 70 page Data Sheet AD7142 Rev. B | Page 9 of 70 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS CIN3 CIN4 CIN5 CIN6 CIN7 CIN8 CIN9 CIN10 CS SCLK SDI SDO VDRIVE DGND2 DGND1 DVCC 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 AD7142 TOP VIEW (Not to Scale) NOTES 1. 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. Figure 6. AD7142 Pin Configuration CIN3 CIN4 CIN5 CIN6 CIN7 CIN8 CIN9 CIN10 ADD1 SCLK ADD0 SDA VDRIVE DGND2 DGND1 DVCC 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 AD7142-1 TOP VIEW (Not to Scale) NOTES 1. 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. Figure 7. AD7142-1 Pin Configuration Table 7. Pin Function Descriptions Pin No. Mnemonic Description 1 CIN3 Capacitance Sensor Input. 2 CIN4 Capacitance Sensor Input. 3 CIN5 Capacitance Sensor Input. 4 CIN6 Capacitance Sensor Input. 5 CIN7 Capacitance Sensor Input. 6 CIN8 Capacitance Sensor Input. 7 CIN9 Capacitance Sensor Input. 8 CIN10 Capacitance Sensor Input. 9 CIN11 Capacitance Sensor Input. 10 CIN12 Capacitance Sensor Input. 11 CIN13 Capacitance Sensor Input. 12 CSHIELD CDC Shield Potential Output. Requires 10 nF capacitor to ground. Connect to external shield. 13 AVCC CDC Supply Voltage. 14 AGND Analog Ground Reference Point for All CDC Circuitry. Tie to analog ground plane. 15 SRC CDC Excitation Source Output. 16 SRC Inverted Excitation Source Output. 17 DVCC Digital Core Supply Voltage. 18 DGND1 Digital Ground. 19 DGND2 Digital Ground. 20 VDRIVE Serial Interface Operating Voltage Supply. 21 SDO (AD7142) SPI Serial Data Output. SDA (AD7142-1) I2C Serial Data Input/Output. SDA requires pull-up resistor. 22 SDI (AD7142) SPI Serial Data Input. ADD0 (AD7142-1) I2C Address Bit 0. 23 SCLK Clock Input for Serial Interface. 24 CS (AD7142) SPI Chip Select Signal. ADD1 (AD7142-1) I2C Address Bit 1. 25 INT General-Purpose Open-Drain Interrupt Output. Programmable polarity; requires pull-up resistor. 26 GPIO Programmable GPIO. 27 TEST Factory Test Pin. Tie to ground. 28 VREF+ CDC Positive Reference Input. Normally tied to analog power. 29 VREF− CDC Negative Reference Input. Tie to analog ground. 30 CIN0 Capacitance Sensor Input. 31 CIN1 Capacitance Sensor Input. 32 CIN2 Capacitance Sensor Input. EPAD 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. |
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