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MCP3008T Datasheet(PDF) 15 Page - Microchip Technology |
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MCP3008T Datasheet(HTML) 15 Page - Microchip Technology |
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15 / 40 page  © 2008 Microchip Technology Inc. DS21295D-page 15 MCP3004/3008 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. Additional descriptions of the device pins follows. TABLE 3-1: PIN FUNCTION TABLE 3.1 Digital Ground (DGND) Digital ground connection to internal digital circuitry. 3.2 Analog Ground (AGND) Analog ground connection to internal analog circuitry. 3.3 Analog inputs (CH0 - CH7) Analog inputs for channels 0 - 7, respectively, for the multiplexed inputs. Each pair of channels can be programmed to be used as two independent channels in single-ended mode or as a single pseudo-differential input where one channel is IN+ and one channel is IN. See Section 4.1 “Analog Inputs”, “Analog Inputs”, and Section 5.0 “Serial Communication”, “Serial Communication”, for information on programming the channel configuration. 3.4 Serial Clock (CLK) The SPI clock pin is used to initiate a conversion and clock out each bit of the conversion as it takes place. See Section 6.2 “Maintaining Minimum Clock Speed” , “Maintaining Minimum Clock Speed”, for constraints on clock speed. 3.5 Serial Data Input (DIN) The SPI port serial data input pin is used to load channel configuration data into the device. 3.6 Serial Data Output (DOUT) The SPI serial data output pin is used to shift out the results of the A/D conversion. Data will always change on the falling edge of each clock as the conversion takes place. 3.7 Chip Select/Shutdown (CS/SHDN) The CS/SHDN pin is used to initiate communication with the device when pulled low. When pulled high, it will end a conversion and put the device in low-power standby. The CS/SHDN pin must be pulled high between conversions. MCP3004 MCP3008 Symbol Description PDIP, SOIC, TSSOP PDIP, SOIC 1 1 CH0 Analog Input 2 2 CH1 Analog Input 3 3 CH2 Analog Input 4 4 CH3 Analog Input – 5 CH4 Analog Input – 6 CH5 Analog Input – 7 CH6 Analog Input – 8 CH7 Analog Input 7 9 DGND Digital Ground 810 CS/SHDN Chip Select/Shutdown Input 911 DIN Serial Data In 10 12 DOUT Serial Data Out 11 13 CLK Serial Clock 12 14 AGND Analog Ground 13 15 VREF Reference Voltage Input 14 16 VDD +2.7V to 5.5V Power Supply 5,6 – NC No Connection |
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