MAX11205PMB1 no-OS Example Project

See projects/max11205pmb1 (doxygen) for the Doxygen documentation.

The MAX11205 is an ultra-low-power (< 300 uA max active current), high-resolution, 16-bit delta-sigma ADC with a simple 2-wire serial interface. It provides the highest resolution per unit power in the industry, and is optimized for applications that require very high dynamic range with low power, such as sensors on a 4 mA to 20 mA industrial control loop. The device features fully differential signal and reference inputs, an internal high-accuracy oscillator requiring no external components, and a digital filter providing more than 80 dB rejection of 50 Hz or 60 Hz line noise. The MAX11205 operates from a 2.7 V to 3.6 V analog supply with a separate 1.7 V to 3.6 V digital supply, and is available in a 10-pin uMAX package operating over the -40°C to +85°C temperature range.

Applications

Sensor measurement (temperature and pressure)
Portable instrumentation
Battery applications
Weigh scales

Hardware Specifications

Power Supply Requirements

The MAX11205PMB1 peripheral module board is powered from the host platform via the 3.3 V supply pin on the PMOD connector. The MAX11205 requires an analog supply voltage (AVDD) between 2.7 V and 3.6 V and a digital supply voltage (DVDD) between 1.7 V and 3.6 V. The reference voltage is set to 3.3 V (3300 mV).

Pin Description

Pin Number	Signal	Description
3	RDY/DOUT	Data-ready output/data-out
4	SCLK	Serial clock input
5	GND	Ground
6	VDD	Power supply (3.3 V)

No-OS Build Setup

Please see: https://wiki.analog.com/resources/no-os/build

No-OS Supported Examples

The initialization data used in the examples is taken out from: Project Common Data Path

The macros used in Common Data are defined in platform specific files found in: Project Platform Configuration Path

Basic Example

The basic example initializes the MAX11205 ADC by setting up SPI and IRQ interfaces. A GPIO IRQ controller manages data-ready signals from the ADC. The program continuously reads ADC data, converts it to millivolts, and prints the results via UART.

In order to build the basic example, make sure you have the following configuration in the Makefile:

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = y
IIO_EXAMPLE = n

IIO Example

The IIO example configures and runs the Industrial I/O (IIO) application with the MAX11205 ADC. It initializes the IIO application parameters, including device-specific settings and a data buffer for storing ADC data, and executes iio_app_run for data acquisition and processing.

If you are not familiar with ADI IIO Application, please take a look at: IIO No-OS

If you are not familiar with the ADI IIO Oscilloscope app, please take a look at: IIO Oscilloscope

In order to build the IIO project, make sure you have the following configuration in the Makefile:

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = n
IIO_EXAMPLE = y

No-OS Supported Platforms

Maxim Platform

Used Hardware

Connections

The MAX32655FTHR does not have a PMOD interface. Use jumper wires to make the required connections as shown below.

MAX11205PMB1 Pin Number	MAX32655FTHR Pin	Function
Pin 3 (DOUT)	MISO	SPI Data Out
Pin 4 (SCLK)	SCLK	Serial Clock
Pin 5 (GND)	GND	Ground
Pin 6 (VDD)	3.3 V	Power Supply
Pin 3 (DRDY)	P1_6	Data Ready IRQ

Build Command

# to delete current build
make reset PLATFORM=maxim TARGET=max32655
# to build the project
make PLATFORM=maxim TARGET=max32655
# to flash the code
make run PLATFORM=maxim TARGET=max32655