EVAL-CN0415-ARDZ Shield

CN0415 is a robust pulse-width modulation (PWM) solenoid driver circuit in an Arduino shield form factor. Target applications include motion control, latches, clamps, brakes, clutches, proportional gas valves, proportional liquid valves, and other industrial applications. The circuit provides accurate, closed-loop current control in 2-state solenoid applications, allowing low-voltage solenoids to be used over a wide range of supply voltages, tolerating overvoltage and under voltage transient conditions caused by cold-cranking and load dump conditions.

image1

Simplified functional block diagram

The simplified circuit diagram shown in figure 1 is a robust solution for accurately and efficiently driving proportional and two-state solenoid actuators. Applications include motion control, latches, clamps, brakes, clutches, proportional gas valves, and proportional liquid valves. The circuit provides accurate, closed-loop current control in 2-state solenoid applications, allowing low-voltage solenoids to be used over a wide range of supply voltages. Initial pull-in current, pull-in time delay, and hold current are independently adjustable in software, greatly reducing power consumption in applications in which the solenoid is continuously energized.

The circuit provides a complete driver solution in proportional valve applications; pulse-width modulation (PWM) duty cycle and frequency can be directly controlled by an external PID controller, and a dither current with programmable frequency and amplitude can be enabled in order to reduce mechanical stiction.

https://media.githubusercontent.com/media/analogdevicesinc/system-level/main/docs/solutions/reference-designs/eval-adicup3029/images/basic_block_diagram1.png

Power Supply Requirements

The CN0415 requires a power supply voltage between 6V and 24V. The current requirement can be as high as 3A, depending on the solenoid’s DC resistance.

Solenoid Requirements

A Deltrol model TAU0730T-02 12V solenoid is provided with the CN0415 as an example. In general, CN0415 will drive any solenoid actuator with an operating voltage of 24V or less and an operating current of 3A.

https://media.githubusercontent.com/media/analogdevicesinc/system-level/main/docs/solutions/reference-designs/eval-adicup3029/images/sensor_interface.png

When driving low voltage solenoids from a high input supply voltage, solenoid current can be limited in software and by adjusting the overcurrent latchoff threshold set by R10-11.

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LED Indicators

LED Indicator

Initial State

Description

DS1

ON

Indicates that the LT4367 supply input voltage supply range

are within its limit

DS2

OFF

Indicates that the LT4367 did detectany fault issue from the input source.

Turns on if the input range is in over voltage range

( where in the limit is currently set at 24V)

DS3

ON

Indicates a +3.3V voltage source from the arduino MCU board

DS4

ON

Indicates a +VCC voltage source going to the system which either

comes from a +3.3V of the Arduino MCU or a +5V output voltage

supply from LT3433 which is set by JP3
https://media.githubusercontent.com/media/analogdevicesinc/system-level/main/docs/solutions/reference-designs/eval-adicup3029/images/board_power_led_indicator.png

ADC Chip Select Jumper Pin Selection

The chip select jumper settings allows the user to stack up multiple boards to the microcontroller board when using SPI digital communication protocol.

image3

Jumper Name

Position

Description

P2

1 and 2

set the chip select to P6-3 of the Arduino MCU GPIO pin terminal

3 and 4

set the chip select to P6-2 of the Arduino MCU GPIO pin terminal

5 and 6

set the chip select to P6-1 of the Arduino MCU GPIO pin terminal

PWM Jumper Pin Selection

The PWM jumper pin selection allows the user to choose from the GPIO pins of the microcontroller to generate excitation rectangular pulse which goes to the N-Channel Mosfet gate driver.

https://media.githubusercontent.com/media/analogdevicesinc/system-level/main/docs/solutions/reference-designs/eval-adicup3029/images/pwm_select1.png

Jumper Name

Position

Description

P34

1 and 2

set the PWM output from P7-7 of the Arduino MCU GPIO pin terminal

3 and 4

set the PWM output from P7-6 of the Arduino MCU GPIO pin terminal

5 and 6

set the PWM output from P7-4 of the Arduino MCU GPIO pin terminal

Other Configuration Options (Default Positions Indicated)

Board Function

Jumper Name

Position

Description

Current Monitor Offset

JP1

1 and 2

ADC Midscale (2.048V)

2 and 3(Default)

0V

ADC Selection

JP2

1 and 2

Current Monitor to Arduino ADC

2 and 3(Default)

Current Monitor to onboard ADC

Vcc Supply Selection

JP3

1 and 2(Default)

Vcc supply from +5V from on board LDO

2 and 3

Vcc supply from +3.3V Arduino pin

Switching Regulator Burst-Mode Selection

JP5

1 and 2(Default)

Disabled Burst-Mode functionality

2 and 3

Enabled Burst-Mode functionality

Hardware Fault Detection on Power Supply Input

P6

1 and 2(Default)

Enable hardware fault detection via LED indicator

2 and 3

Disable hardware fault detection

Hardware Fault Detection on Switching Regulator Output

P7

1 and 2

Enable hardware fault detection via LED indicator

2 and 3(Default)

Disable hardware fault detection

Overcurrent latch off

JP8

1 and 2(Default)

latch off enabled

2 and 3

latch off disabled

Arduino ADC channel select

P10-P15

P10(Default)

Select Arduino analog input for current monitor.

OC/UC select

P21-P22

P22(Default)

Select fault polarity(Overcurrent or undercurrent)

Logic Signal Control

P32 and P36

P32

Disable on Fault

P36 (Default)

Always Enabled

Output Enable

P26-P28

P26

Always Enabled

P27

GPIO/Software control

P28(Default)

Disable on Fault

Arduino Vref

P9

P9(Open)

Short to set Arduino Vref to 4.096V

ADC CS

P2

1 and 2(Default)

GPIO to use for ADC CS

Arduino Interface

The EVAL-CN0415-ARDZ is compatible with the EVAL-ADICUP3029 platform. Because the ADICUP3029 is an Arduino form factor compatible development board, many other equivalent Arduino form factor development board can also be used simply by writing custom code. Below is the pinout of the custom connector of the EVAL-CN0415-ARDZ eval board.

https://media.githubusercontent.com/media/analogdevicesinc/system-level/main/docs/solutions/reference-designs/eval-adicup3029/images/detailed_diagram3.png

Software

The ADuCM3029_demo_cn0415 provides a solution for controlling and monitoring solenoid actuator current, using an EVAL-CN0415-ARDZ shield installed on an EVAL-ADICUP3029 base board. The user interface is implemented as a command line interface (CLI) through a serial UART connection. The project is created using CrossCore Embedded Studio and GNU ARM compiler.

Schematic, PCB Layout, Bill of Materials

Download

EVAL-CN0415-ARDZ Design & Integration Files

  • Schematics

  • Bill of Materials

  • Gerber Files

  • Assembly Files

Registration

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End of Document