The circuit shown in Figure 1 provides a complete, fully isolated and highly flexible, 4-channel analog output system suitable for programmable logic controllers (PLCs) and distributed control system (DCS) applications that require ±5 V, ±10 V voltage and 4 mA to 20 mA current output with HART-compatibility. All outputs are protected from transients and are suitable for the most harsh industrial environments.
The HART compatibility of this module provides a complete field communications solution that is simple to use, low cost, and extremely reliable.
The circuit is powered from a standard 24 V bus supply, with on-board filtering and protection circuitry. Because many factories and industrial environments power their PLC/DCS from a 24 V standard bus line, this module is easy to integrate into any existing system. This module can also be powered from other standard supplies, starting from 12 VDC to 28 VDC
Terminal block P17 is the power supply input (input range:+12V to +36V DC). The EARTH terminal can be connected to an external earth connection, to the GND terminal or left floating if an external earth connection is not used. The Green power LED should lit up when connected to a power supply.
The default jumper position for P9 and P10 are shorted at position 1 and 2 while the two DIP switches S3 and S4 should be in ON state switch position.
|P9 jumper connections for HART enable (EN) control||P10 jumper connections for Chip select (SYNC) control|
If only a single board is used, then connect jumpers P9 and P10 as shown in the table below.
If more than one board is stacked (up to 4), then each board must be set to a different DAC and HART select address. Connect jumpers P9 and P10 as shown in the table below, and ensure that the software is configured accordingly. On a given board, set the DAC and HART address to the same position. If necessary, the software can be changed to address differently the DAC and HART on a given board.
|pin 4 & pin 6||AIN2:AIN3 = 00||multiple||pin 4 & pin 6||AIN0:AIN1 = 00||multiple|
|pin 3 & pin 5||AIN2:AIN3 = 01||multiple||pin 3 & pin 5||AIN0:AIN1 = 01||multiple|
|pin 7 & pin 5||AIN2:AIN3 = 10||multiple||pin 7 & pin 5||AIN0:AIN1 = 10||multiple|
|pin 8 & pin 6||AIN2:AIN3 = 11||multiple||pin 8 & pin 6||AIN0:AIN1 = 11||multiple|
EEPROM default address configuration of the board is “000” you can configure the EEPROM I2C address from 000 to 111.
EEPROM WP pin can be configured as single or multi board operation. The default connection of WP pin is shorted to GND.
All connector pinouts for the EVAL-CN0418-ARDZ are described in the table below.
|Connector||Pin No.||Pin Name||ADuCM3029 Pin Function||CN0418 Pin Function|
|Arduino DIO High||1||SCL||I2C0_SCL/GPIO04||SCL (EEPROM)|
|4||AGND||AGND (Analog ground)||DGND|
|Arduino DIO Low||1||IO08||BPR0_TONE_N/GPIO08||DAC_FAULT(AD5755-1)|
|5||IO13||XINT0_WAKE2/GPIO13||HW RXD (AD5700-1)|
|Arduino Power||1||NC||- not connected -||NC|
|6||GND||DGND (Digital Ground)||GND|
|7||GND||DGND (Digital Ground)||GND|
|8||Vin||DC Barrel Jack Power +7V to +12V||+7.5V|
Up to four EVAL-CN0418-ARDZ boards can be controlled by a single Arduino or EVAL-ADICUP3029 base board by using a simple control scheme. This control scheme will control the SYNC, CD and RX signals to avoid a data conflict.
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