User Manual

VMA344
V. 01 – 10/04/2019 3 ©Velleman nv
5. Overview
The VMA344 - PCF8591 is a monolithically integrated, low-power, 8-bit CMOS data acquisition device. The
PCF8591 has four analogue inputs, one analogue output and a serial I2C bus interface.
For testing purposes, the VMA344 contains a LDR, NTC and a trimmer, which are connected to the PCF8591
by 3 jumpers.
single power supply
operating supply voltage ........................................................................................ 2.5-6.0 V
low standby current
serial input and output via I2C-bus
max. sampling rate given by I2C-bus speed
4 analogue inputs configurable as single-ended or differential inputs
auto-incremented channel selection
analogue voltage range from VSS to VDD
on-chip track and hold circuit
8-bit successive approximation A/D conversion
multiplying DAC with one analogue output
6. Connection
VMA344
description
VMA100 (UNO)
AOUT
DA output
A0 (example 2)
AIN0
analogue input 0
AIN1
analogue input 1
AIN2
analogue input 2
AIN3
analogue input 3
SCL
I2C clock
A5
SDA
I2C data
A4
GND
ground
GND
VCC
power supply 3.3-5 V
5 V (or 3.3 V)
The VMA344 contains 3 removable jumpers, which are connected to:
P4
AIN1
NTC
P5
AIN0
phototransistor
P6
AIN3
potentiometer