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Mesa Electronics 7i76 Step/Direction + I/O Daughter Card (view source)
Revision as of 10:59, 20 October 2022
, 10:59, 20 October 2022added idle voltage levels
A 25-pin daughtercard for Mesa FPGA boards. There is are separate sourcing and sinking editions of the board for the field I/O.
A 25-pin daughtercard for Mesa FPGA boards. There is are separate sourcing and sinking editions of the board for the field I/O.
== Wiring ==
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=9 Page 9] (3 in the PDF) shows the connector locations
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=10 Page 10] (4 in the PDF) shows the FPGA side DB-25 pinout
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=11 Pages 11-12] (5-6 in the PDF) show the TB2/TB3 step/direction pinouts
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=12 Page 12] (6 in the PDF) shows the TB3 encoder input pinout
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=12 Page 12] (6 in the PDF) shows the TB3 Smart Serial (RS-422) pinout
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=17 Page 17] (11 in the PDF) shows the TB3 Smart Serial (RS-422) pinout with CAT5 wiring scheme
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=13 Page 13] (7 in the PDF) shows the TB4 spindle output pinout
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=14 Pages 14-15] (8-9 in the PDF) show the TB5 field I/O pinout
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=16 Page 16] (10 in the PDF) shows the TB1 field power pinout
Give that all of the FPGA pins are being driven to +5V (high), the 7i76 has the following output levels with respect to digital ground:
{| class="wikitable"
! TBx Pin
! Voltage
|-
| STEP/DIRx+
| +5V (high)
|-
| STEP/DIRx-
| 0V (low)
|-
| RS-422 TX+
| 0V (low)
|-
| RS-422 TX-
| +5V (high)
|-
| RS-422 RX+
| +2.5V (invalid)
|-
| RS-422 RX-
| +2.5V (invalid)
|}
== Dimensions ==
* [http://www.mesanet.com/pdf/parallel/7i76man.pdf#page=58 Page 58] (52 in the PDF) shows a dimensional diagram
== Bill of Materials ==
== Bill of Materials ==
| [https://www.digikey.com/en/products/detail/microchip-technology/DSPIC33FJ16GS402-I-SO/2059890 Microchip DSPIC33FJ16GS402-I/SO]
| [https://www.digikey.com/en/products/detail/microchip-technology/DSPIC33FJ16GS402-I-SO/2059890 Microchip DSPIC33FJ16GS402-I/SO]
|-
|-
| U9,U12
| U9
| [onsemi logo] ACT 540 PSLJ [TSSOP-20]
| [onsemi logo] ACT 540 PSLJ [TSSOP-20]
| [https://www.digikey.com/en/products/detail/onsemi/MC74ACT540DTR2G/1479746 onsemi MC74ACT540DTR2G]
| [https://www.digikey.com/en/products/detail/onsemi/MC74ACT540DTR2G/1479746 onsemi MC74ACT540DTR2G]
|-
| U12
| [onsemi logo] ACT 541 PBLH [TSSOP-20]
| [https://www.digikey.com/en/products/detail/onsemi/MC74ACT541DTR2G/920949 onsemi MC74ACT541DTR2G]
|-
|-
| U10,U11,U14,U15
| U10,U11,U14,U15
[http://store.mesanet.com/index.php?route=product/product&product_id=119 7i76 | Mesa Web Store]
[http://store.mesanet.com/index.php?route=product/product&product_id=119 7i76 | Mesa Web Store]
[http://store.mesanet.com/index.php?route=product/product&product_id=322 7i76 | Mesa Web Store]
[http://store.mesanet.com/index.php?route=product/product&product_id=322 7i76D | Mesa Web Store]