MAX14900DEVKIT datasheet(2/17 Pages) MAXIM

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Evaluates: MAX14900E

MAX14900E Evaluation Kit

Quick Start

Recommended Equipment

● MAX14900E EV kit

● 24V, 2A power supply

● Function generator

● Oscilloscope

● 50Ω, 15W (minimum) load resistor

● 5kΩ resistor

● Voltmeter

● Bench tie clips with spring clips on both ends

Procedure

The EV kit is fully assembled and tested. Follow the steps

below to verify board operation:

1) Preset the 24V power supply to 24V and disable the

power supply.

2) Connect the ground of the 24V power supply to

jumper J2.

3) Connect the positive supply of the 24V power supply

to J1.

4) Ensure that the shunt for J15 (EN) is installed.

5) Ensure that the shunt for J16 (connect VL to 5V) is

installed.

6) Ensure that J22 (PUSHPL) is installed.

7) Ensure that all other shunts are not installed.

8) Preset the function generator to pulse, 20ms pulse

width, 500ms repetition rate, low-voltage 0V, high-

voltage 5V, and disable the pulse generator.

9) Connect a 5kΩ resistor between O1 (TP11) and

GND (TP12).

10) Connect an oscilloscope between O1 (TP11) and

GND (TP12).

11) Connect the function generator between IIN1 (TP1)

and GND (TP10).

12) Enable the 24V power supply.

13) Enable the function generator.

14) Observe the output waveform on the oscilloscope.

15) Disable the function generator.

16) Change the resistor from 5kΩ to 50Ω.

17) Remove the shunt on J22 (PUSHPL).

18) Enable the function generator.

19) Observe the output waveform on the oscilloscope.

Detailed Description

The MAX14900E octal, high-speed, industrial, high-side

switch EV kit is a fully assembled and tested, surface-

mount PCB that demonstrates the capabilities of the

MAX14900E IC to drive industrial-grade signals.

This EV kit demonstrates operation in all MAX14900E

modes. In parallel mode, jumpers allow for arbitrary

configuration. In serial mode, or in parallel mode with

serial monitoring, attach a control circuit to the appropriate

test points. The EV kit operates from a single 24V

(11V to 36V) main supply, and an optional logic supply.

Through parallel or serial control, the IC switches the

24V supply to any combination of eight independent

outputs. Besides the device itself, there are plenty of

attach points, as well as numerous jumpers. The EV kit

has little added circuitry.

TVS diode D18 protects the device from surges that may

appear on the supply line through the clamp diodes.

Note that D18 will likely be destroyed if the user applies

a voltage greater than 36V on the 24V supply. Sixteen

silicon diodes (D2–D17) protect the individual MAX14900E

power outputs from severe inductive kickback events,

as well as surges. A linear regulator, MAX5084 (U2),

provides an optional default 5V in case the user does

not wish to provide a logic-level supply externally. LED1

(FAULT) can be optionally configured to light whenever

the device indicates a fault condition on its FAULT pin.

LED2 (CERR) can be optionally configured to light when

the device detects a CRC error in serial mode.

Input Power Supply

The EV kit obtains its primary power from a bench supply

whose positive voltage attaches to J1 (24V), and whose

return voltage attaches to J2 (GND). This supplies power

only to the MAX14900E.

5V Power Supply

The device requires a 5V supply on pin 30 (V5), supplied

by the 5V linear regulator (U2) for the user’s convenience.

Logic Power Supply

Most of the device’s digital pins have their input thresh-

olds and their output drive levels defined by the voltage

on pin 13 (VL). This VL supply can come from two places.

First, the built-in 5V regulator can supply VL by attaching

a shunt to J16 (connect VL to 5V), ensuring that no shunt

is attached to J3 (VL). When attaching external circuitry

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