MAX32620 datasheet(4/17 Pages) MAXIM

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Evaluate: MAX32620, MAX32621

MAX32620, MAX32621

Evaluation Kits

Detailed Description of Hardware

This section describes each major function or component

on the EV kit. This EV kit is general-purpose in nature

and provides many user-selectable options, which are

described in the following sections. Each jumper setting

is described and its default setting illustrated.

Board Power

The EV kit’s main power-supply input is +5V, made avail-

able through Micro-USB type-B connector CN1 or CN2.

The board is default jumpered for power to be provided

by CN1.

Current Monitoring

Jumpers JP15, JP16, JP18, and JP19 provide conve-

nient current monitoring points for VDD12 (JP15), VRTC

(JP18), VDDB (JP19), and VDDA+VDD18 (JP16). VDDIO

(JP27) and VDDIOH (JP30) current can be monitored

using these source selection jumpers.

Pushbuttons

Pushbuttons (normally open) SW1, SW2, and SW3 can

be used to generate a logic 0 signal on their correspond-

ing GPIO port pins. Firmware defines the action taken on

switch closure.

Pushbutton SW4 provides a global POR reset function for

the IC by asserting the RSTN input.

Pushbutton SW5 controls the PFN1 input of the PMIC.

The function of the PFN1 input is configurable, but is

preset to reset the PMIC when depressed for at least 12

seconds. Refer to the MAX14690 IC data sheet for com-

plete information.

USB

The IC provides an integrated USB2.0 full-speed interface

(12Mbps). This interface is accessed through the Micro-

USB type-B connector, CN2.

USB-UART Bridge

The EV kit board provides a USB-to-UART bridge chip,

FTDI FT230X. This bridge eliminates the requirement

for a physical RS-232 COM port. Instead, the IC’s UART

access is through the Micro-USB type-B connector,

CN1. Virtual COM port drivers and guides for installing

Windows® drivers are available at www.ftdichip.com.

Default parameters are 115,200 baud, 8 bits, no parity, 1

stop bit, no flow control.

The USB-to-UART bridge can be connected to UART 0

or UART 1 of the IC with jumpers JP10 (RX), JP12 (TX),

JP13 (CTS), and JP14 (RTS). This interface is the default

power source for the EV kit

LEDs

The EV kit board has four LEDs with series current-

limiting resistors. LEDs D1 (red), D4 (green), D5 (red),

and D6 (green) are connected to the IC’s GPIO pins P3.0,

P3.1, P3.2, and P3.3, respectively. LED GPIOs must be

configured as open drain due to 3.3V LED source volt-

ages. An LED is illuminated when the appropriate GPIO

pin is driven low.

Bluetooth Low-Energy (BLE) Controller

The EV kit board has a low-power Bluetooth controller,

EM9301. Communication with the IC is through SPI 2B.

This particular SPI port was selected due to the additional

flow control signals that it features. The EM9301 controller

is Bluetooth specification V4.0 compliant. Refer to the EM

Microelectronic EM9301 data sheet for additional details.

Clocking

The IC operates from an internal 96MHz relaxation oscil-

lator. The internal oscillator is adequate to run the core

digital logic and peripherals. The accuracy of the internal

oscillator is not suitable for accurate RTC timekeeping

or USB operation. The external 32.768kHz crystal, Y1,

provides the RTC with an accurate time base and is also

used to calibrate the internal oscillator for the accuracy

required for USB operation.

JTAG Connector

The ARM standard 20-pin connector pinout is provided

by shrouded header J1. Various debugger modules are

available for this interface. The Olimex ARM-USB-TINY-H

debugger is supplied with the EV kit.

Graphic OLED Display Module

A 128 x 32 pixel graphic OLED display module, NHD-

2.23-12832UCB3, is provided on the EV kit board.

Communications with the NHD-2.23-12832UCB3 is

through SPI 2A.

GPIO Headers and Port Configuration

The IC provides support for both 1.8V and 3.3V peripher-

als through power rails VDDIO and VDDIOH. GPIO volt-

ages can be programmed on a port-by-port basis, refer

to the IC’s user’s guide for more detail. Multiple pullup

options are supported when using special function port

modes, with user selectable pullup voltage options to both

rail voltages supported through jumper selection.

Windows is a registered trademark and registered service mark

of Microsoft Corporation.

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