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Evaluates: MAX77643

MAX77643 Evaluation Kit

GPIO Quick Start

There are two GPIOs (GPIO0 and GPIO1) that can serve

either as standard GPIOs or in their alternate function-

alities. On-board LEDs light up depending on the GPIO

state. To get started with the GPIOs, follow the procedure

below:

1) In the

GPIO tab of the GUI, set GPIO0’s Alternate

Mode to 0 (SBB is Set by TV_SBB0), and GPIO1’s

Alternate Mode to 0 (Standard GPIO).

2) Set the Direction to 0 (Output).

3) Set the Driver Type to 1 (Push-Pull). If using 0

(Open-Drain), make sure there is a pullup resistor on

the GPIO pin.

4) Click the

Write button.

5) Set the Data Output to 1 (Logic High) and click the

Write button. The on-board LED should light up.

6) Now change the Direction to 1 (Input) and click the

Write button.

7) Install the appropriate shunt on J5 or J8 to connect

the desired GPIO to the GUI GPIO.

8) From the GUI, toggle the EV Kit

GPIO, clicking Write

after each time. Click

Read to observe the GPIO

Input Value update.

Table 1. Default Shunt Positions and Jumper Descriptions

Figure 6. GPIO Headers

REFERENCE

DESIGNATOR

DEFAULT

POSITION

FUNCTION

J203

1-2

1-2: Connects SBB1 to the on-board electronic load.

J205

1-2

1-2: Connects SBB2 to the on-board electronic load.

J207

1-2

1-2: Connects LDO to the on-board electronic load.

J200

1-2

1-2: Connects the gate of the Q200 load FET to the U200 amplifier.

J202

1-2

1-2: Connects the gate of the Q201 load FET to the U201 amplifier.

J204

1-2

1-2: Connects the gate of the Q202 load FET to the U202 amplifier.

J206

1-2

1-2: Connects the gate of the Q203 load FET to the U203 amplifier.