Evaluating the LT8491

The DC2703A-A-KIT houses the DC2703A (LT8491 demo board). They provide a high performance buck-boost battery charger converter with an I2C interface for a microcontroller host. The LT8491 implements a maximum power point tracking (MPPT) function and flexible charging profiles, suitable for most battery types such as flooded and sealed lead acid batteries and Li-Ion batteries.

Hardware Specifications

Power Supply Requirments

For this specific project, the DC2703A is powered by the 3V3 supply from the MAX32666FTHR.

Board Connector and Jumper Settings

Pin Description

Please see the following table for the pin assignments:

Name

Description

VDD

Connect to 3V3 supply

GND

Connect to Ground

SCL

Connect to I2C Clock (SCL)

SDA

Connect to I2C Data (SDA)

No-OS Build Setup

Please see: https://wiki.analog.com/resources/no-os/build

No-OS Supported Examples

The initialization data used in the examples is taken out from: Project Common Data Path

The macros used in Common Data are defined in platform specific files found in: Project Platform Configuration Path

Basic example

This is a simple example that:

initializes the LT8491
software reset the LT8491
disables charger
writes-then-reads scratch pad
reads serial number
configures telemetry
enables charger
reads charging status and charging stage
and periodically reads telemetry data.

In order to build the basic example make sure you have the following configuration in the Makefile

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = y
IIO_EXAMPLE = n

IIO example

This project is actually a IIOD demo for DC2703A. The project launches a IIOD server on the board so that the user may connect to it via an IIO client.

Using IIO-Oscilloscope, the user can configure the device.

If you are not familiar with ADI IIO Application, please take a look at: IIO No-OS

If you are not familiar with ADI IIO-Oscilloscope Client, please take a look at: IIO Oscilloscope

The No-OS IIO Application together with the No-OS IIO LT8491 driver take care of all the back-end logic needed to setup the IIO server.

This example initializes the IIO device and calls the IIO app as shown in: IIO Example

In order to build the IIO project make sure you have the following configuration in the Makefile

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = n
IIO__EXAMPLE = y

No-OS Supported Platforms

Maxim Platform

Used hardware

Connections:

DC2703A Pin	Function	MAX32666FTHR Pin
VDD	VDD	3V3
SCL	I2C Clock (SCL)	P0_6 (I2C0_SCL)
SDA	I2C Data (SDA)	P0_7 (I2C0_SDA)
GND	Ground (GND)	GND

Build Command

# to delete current build
make PLATFORM=maxim TARGET=max32665 reset
# to build the project and flash the code
make PLATFORM=maxim TARGET=max32665 run