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RASPBERRY PI ZERO KORTTI 17-BIT 8-CH ADC Näytä suurempana

RASPBERRY PI ZERO KORTTI 17-BIT 8-CH ADC

RPI ADCZ

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45,58 €

Abelectronics ADCPI - kahdeksan kanavainen 17-bittinen AD-muunnin Raspberry Pi Zero formaatissa.

Toiminta perustuu I2C-liitäntäiseen MCP3424 deltasigma AD-muuntimeen jossa on matalakohinaiset diffistulot. Tulojännitealue on 0-5,06VDC. Tarkemmat  tiedot ja käyttöesimerkit löytyvät Lisätiedot välilehden linkin takaa.

Yhteensopivat mallit: Raspberry Pi 4, 3B/B+, 2B, 1A+, 1B+, A+, Zero.

Features

  • 8 x 17-bit 0 to 5V Single Ended Inputs
  • Control via the Raspberry Pi I2C port
  • Stack up to 4 ADC Pi boards on a single Raspberry Pi
  • Jumper selectable I2C addresses
  • Buffered 5V I2C port
  • Based on the MCP3424 from Microchip Technologies Inc
  • Single Ended full-scale range of 5.0V
  • On-board 2.048V reference voltage (Accuracy ± 0.05%, Drift: 15 ppm/°C)
  • On-Board Programmable Gain Amplifier (PGA): Gains of 1, 2, 4 or 8
  • Programmable Data Rate Options:
    - 3.75 SPS (17 bits)
    - 15 SPS (15 bits)
    - 60 SPS (13 bits)
    - 240 SPS (11 bits)
  • One-Shot or Continuous Conversion Options

The ADC Pi is an 8 channel 17 bit analogue to digital converter designed to work with the Raspberry Pi. The ADC Pi is based on two Microchip MCP3424 A/D converters each containing 4 analogue inputs. The MCP3424 is a delta-sigma A/D converter with low noise differential inputs.

Not sure which ADC you need ? Check Abelectronics Analogue to Digital Buyers guide to compare our ADC expansion boards.

Abelectronics designed the ADC Pi to work as a single ended A/D converter using the internal 2.048V reference voltage with the -V pins tied to ground. A voltage divider on the ADC Pi board brings the input voltage range to a much more useful 0 – 5.06V. In this configuration the sample size is 17 bits for each channel.

The ADC Pi is powered through the host Raspberry Pi using the GPIO port and extended pins on the GPIO connector allow you to stack the ADC Pi along with other expansion boards.

The two MCP3424 A/D converters communicate via i2c to the host Raspberry Pi giving you eight analogue inputs to use. A logic level converter is included on the ADC Pi board giving you a buffered 5V i2c port making it easy to add other I2C devices which operate at 5 volts without damaging the raspberry pi 3.3 volt i2c port. The i2c buffer uses N-channel mosfets with a maximum drain current of 100mA.

The I2C address bits are selectable using the on-board jumpers. The MCP3424 supports up to 8 different I2C addresses so with two A/D converters on each ADC Pi you can stack up to 4 ADC Pi boards on a single Raspberry Pi giving you 32 ADC inputs.

The MCP3424 contains a programmable Gain Amplifier giving the user a selectable gain of x1, x2, x4 or x8 before the analogue to digital conversion takes place.

The data rate for analogue to digital conversions is 3.75 (17 bit), 15 (15 bit), 60 (13 bit) or 240 (11 bit) samples per second. Data rate and resolution can be configured within software using the I2C interface.

Abelectronics has a knowledge base article, ADC Sample Rate Comparison which has more detailed sample information and test scripts to compare the different MCP2424 ADC chip bit and sample rates.

Unused inputs should be tied to ground.

If you want to sample a higher input voltage you can Abelectronics ADC Pi Input Voltage Calculator to find the additional resistors and calculation values needed.

Input Ratings & Specifications

  • Vdd (5V pin on I2C bus): 5.0V
  • ADC Input Voltage: 0V to +5.06V
  • Maximum ADC Input voltage: VSS–0.4V to VDD+0.4 V
  • Current at Input Pins: ±2 mA
  • I2C SDA/SCL voltage: 5.0 V
  • I2C port current: 100 mA

EAN7426787870071
Klikkaa tarkemmat tiedot
ValmistajaABElectronics
Valmistajan malli ADCPI
Mitat65 x 30 mm
YhteensopivaRaspberry Pi Zero

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