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This version (28 Feb 2019 15:55) was approved by Brandon.The Previously approved version (28 Feb 2019 09:43) is available.Diff

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.

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.

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.

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.

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

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.

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.

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.

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

EVAL-CN0415-ARDZ Design & Integration Files

  • Schematics
  • Bill of Materials
  • Gerber Files
  • Assembly Files
resources/eval/user-guides/eval-adicup3029/hardware/cn0415.txt · Last modified: 28 Feb 2019 15:55 by Brandon