INTF3000 datasheet(4/19 Pages) MAXIM

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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

RB0L

RB1L

RB2L

RB3L

RB4L

RB5L

RB6L

RB7L

RA0L

RA1L

RA2L

RA3L

ADDRESS

JU6

JU7

9123*

Removed

9124

Removed

Installed

9125

Installed

Removed

9126

Installed

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