Evaluating the ADMT4000

The ADMT4000 is a magnetic turn, counter sensor capable of recording turns of an external magnetic field with zero power. The absolute position, including the number of turns, is reported via a serial peripheral interface (SPI).

Hardware Specifications

Power Supply Requirements

For the EVAL-ADMT4000ARD1Z, the power supply is provided by the SDP-K1 via the 5V from the USB-C connector. At least 9V DC power supply is also required via the EVAL-ADMT4000ARD1Z's DC barrel jack to power the motor assembly.

For the EVAL-ADMT4000ARD2Z, since there is no motor in this kit, only the 5V power supply from the USB-C connector is required.

Pin Description:

P1 Header

Pin

Name

Description

A0

GPIO5

ADMT4000 GPIO5/BOOTLOAD pin

A1

SHDN_N

Power control pin for Coil Driver

A2

RSTB

ADMT4000 Reset pin

A3

V_EN

ADMT4000 Supply Enable pin

P2 Header

Pin

Name

Description

+3.3V

3V3

Board 3.3V Supply

+5V

5V

Board 5V Supply

GND

GND

Board GND

GND

GND

Board GND

VIN

Not in Used

P4 Header

Pin

Name

Description

D8

GPIO4

ADMT4000 GPIO4/FAULT pin

D9

DIAG1

TMC5240 Diag1 pin (EVAL-ADMT4000ARD1Z)

D10

CS_MT

Chip Select for ADMT4000

D11

MOSI

SPI MOSI

D12

MISO

SPI MISO

D13

SCK

SPI SCK

GND

GND

Board GND

SDA

I2C SDA

EEPROM I2C SDA

SCL

I2C SCL

EEPROM I2C SCL

P5 Header

Pin

Name

Description

D2

GPIO2

ADMT4000 GPIO2 pin

D3

GPIO0

ADMT4000 GPIO0/Busy pin

D4

COIL_RS

Coil drive pin for magnetic reset

D5

GPIO1

ADMT4000 GPIO1/CNV pin

D6

GPIO3

ADMT4000 GPIO3/ACALC pin

D7

CS_MOTOR

CS for TMC5240 (EVAL-ADMT4000ARD1Z)

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 demonstrates the basic functionalities of the ADMT4000, and performs capture of turns, angles, temperature, sine, cosine, radius, GPIO states, and fault from the ADMT4000 in a while loop with a minimum interval of 500 ms. Data is printed in the UART console. Thus, tools like tera-term, putty, and other terminals can be used to view the data by setting the UART baud rate to 230400.

To build the basic example:

# to delete current build
make reset
# to build the project
make PLATFORM=stm32 EXAMPLE=basic_example
# to flash the code to the controller
make PLATFORM=stm32 EXAMPLE=basic_example run

IIO example

The IIO device driver contains the IIO specific implementations for the ADMT4000. This example project runs an IIOD server on the board, which can be accessed by users from host computers via IIO clients through libiio. IIO utilities such as iio_info, iio_attr, and iio_readdev can be used to interact with the IIO device. IIO Oscilloscope and Scopy 2.0 can also be used for simple data visualization.

To learn more about ADI IIO Application, please take a look at: IIO No-OS

To learn more about ADI IIO-Oscilloscope Client, please take a look at: IIO Oscilloscope

The no-OS IIO driver for the ADMT4000 and the IIO application handles all the back-end logic needed to setup the IIOD server.

This example initializes the IIO device and calls the IIO app as shown in: IIO Trigger Example

This IIO project supports exposes the ADMT4000 as an IIO device. Details of the IIO implementation is documented in IIO section of the ADMT4000 driver: ADMT4000 Drivers

This IIO project also supports the TMC5240 as an IIO device if TMC_DEVICE is defined as TMC5240 in the Makefile. EVAL-ADMT4000ARD1Z has an onboard TMC5240. Details of the IIO implementation for the TMC5240 is documented in the IIO TMC5240 driver: TMC5240 Drivers

In order to build the IIO project:

# to delete current build
make reset
# to build the project
make PLATFORM=stm32 EXAMPLE=iio_trigger_example TMC_DEVICE=TMC5240

No-OS Supported Platforms

STM32 Platform

Used hardware

SDP-K1

make PLATFORM=stm32 <other build parameters>