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INTF3000 Arkusz danych(PDF) 4 Page - Maxim Integrated Products |
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INTF3000 Arkusz danych(HTML) 4 Page - Maxim Integrated Products |
4 / 19 page Maxim Integrated │ 4 www.maximintegrated.com Evaluates: EV Kits Requiring SPI/Parallel to USB Interface INTF3000 Interface Board The outputs can be a serial clock, serial data, serial chip select, or just a control pin to turn on/off functions on the DUT. Serial signals are not limited to a specific pin; the software, not the hardware, defines the function of each output pin. Jumpers JU1 JU1 configures the pullup resistors for the output driv- ers (U2 and U3). Each output RA0–RA5 and RB0–RB7 has an open-drain driver. These drivers are used to level translate the 5V logic of the USB controller to the lower voltage logic levels of the DUT EV board. If JU1 is in the VBUS position, the inputs and outputs of the drivers are compatible with 5V logic only. If JU1 is in the VDEV position, the drivers get their bias from the logic supply voltage of the DUT EV board through Pin 1 of INTF2400 or Pin 12 of INTF2300 connector. It should be noted that the DUT EV board must have the logic supply voltage routed to these pins. If JU1 is removed, an external VCC can be connected to the test point (VPULL). This configuration must be used for low VCC boards that do not have their VCC routed to VDEV. Some legacy EV boards that have the DB25 connector must use this configuration since the DB25 connector does not have a VDEV pin. JU6, JU7 JU6 and JU7 set the address of the INTF3000 board. There are four possible addresses so that up to four different INTF3000 boards may be used on one PC. Table 7 shows these four addresses and the associated jumper positions. The software used must be set to the same address as the jumper configuration. LED LED D1 serves two purposes: 1) D1 will blink once when the INTF3000 is first connected. This shows that the processor has powered-up properly. 2) D1 will toggle on and off for every command received from the PC. This shows activity. Table 6. Output Pins for LPT Connector Table 7. INTF3000 Possible Addresses * This is the default address for most EV boards. LPT PIN U1 OUTPUT PORT PIN 1 2 3 4 5 6 7 8 9 14 16 17 RB0L RB1L RB2L RB3L RB4L RB5L RB6L RB7L RA0L RA1L RA2L RA3L ADDRESS JU6 JU7 9123* Removed Removed 9124 Removed Installed 9125 Installed Removed 9126 Installed Installed |
Podobny numer części - INTF3000 |
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Podobny opis - INTF3000 |
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