Mesa Electronics 7i76 Step/Direction + I/O Daughter Card
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Overview
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
- Page 9 (3 in the PDF) shows the connector locations
- Page 10 (4 in the PDF) shows the FPGA side DB-25 pinout
- Pages 11-12 (5-6 in the PDF) show the TB2/TB3 step/direction pinouts
- Page 12 (6 in the PDF) shows the TB3 encoder input pinout
- Page 12 (6 in the PDF) shows the TB3 Smart Serial (RS-422) pinout
- Page 17 (11 in the PDF) shows the TB3 Smart Serial (RS-422) pinout with CAT5 wiring scheme
- Page 13 (7 in the PDF) shows the TB4 spindle output pinout
- Pages 14-15 (8-9 in the PDF) show the TB5 field I/O pinout
- 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:
| 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
- Page 58 (52 in the PDF) shows a dimensional diagram
Bill of Materials
| Name | Marking | Part |
|---|---|---|
| U2 | [intersil logo] ISL32174 EIBZ W1932AAUS [SOIC-16] | Renesas ISL32174EIBZ |
| U3 | NXP 74HCT14D 46560037 YXD1751F [SOIC-14] | NXP 74HCT14D |
| U4,U5 | [onsemi logo] NCV7608 [SOIC-28] | onsemi NCV7608DWR2G |
| U6 | [TI logo] 89AQCSK G4 26LS32AC [SOIC-16] | Texas Instruments AM26LS32ACD |
| U7 | [Analog Devices logo] 121N0BR #935* 86322 [SOIC-8] | Analog Devices ADUM121N0BRZ |
| U8 | [Microchip logo] dsPIC33FJ16GS 402-I/SO (e3) 1925YJK [SOIC-28] | Microchip DSPIC33FJ16GS402-I/SO |
| U9 | [onsemi logo] ACT 540 PSLJ [TSSOP-20] | onsemi MC74ACT540DTR2G |
| U12 | [onsemi logo] ACT 541 PBLH [TSSOP-20] | onsemi MC74ACT541DTR2G |
| U10,U11,U14,U15 | [TI logo] 8CAG0YM LV4051A G4 [SOIC-16] | Texas Instruments SN74LV4051ADR |
| U13 | [onsemi logo] ACT04 PACL09 [SOIC-14] | onsemi 74ACT04SC |
| U16 | NXP HEF4001BT CKX97806 TXD16224 [SOIC-14] | NXP HEF4001BT |
| U17 | [I logo] S5230 PMIYE [SOIC-8] | onsemi NE5230DR2G |
| O1,O2 | [Toshiba logo] 837 P127 | Toshiba TLP127TPRUF |
| O3 | [onsemi logo] H11L1 931Q [DIP-6] | onsemi H11L1 |
| P1 | AMP 171 04? 5747846-4 | TE 5747846-4 |
| TB1,TB4 | 8-position 3.5mm pitch pluggable terminal block header | Phoenix Contact 1843664 |
| TB2,TB3,TB5,TB6 | 24-position 3.5mm pitch pluggable terminal block header | |
| W1-W6 | 3-position 2.54mm pitch header for jumper | Adam Tech PH1-03-UA |