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UM-PM-039

DA9070 / DA9231 Fuel Gauge Development Kit

Introduction

DA9070 Fuel Gauge EVK is a fuel gauge development and evaluation platform to demonstrate a low

power fuel gauge system using the DA9070, DA9231, and an MCU with Dialog's proprietary

algorithm. The DA9070 is an ultra-low quiescent current PMIC with integrated charger, buck

converter, boost converter, and 3 LDOs. The DA9231 is an ultra-low quiescent current buck

converter that is efficient down to 10 µA with a nano-ampere LDO.

The low-power consumption MCU (STM32L151RD) allows the user to program the battery charging

profile, discharge load profile, and fuel gauge algorithm. The DA9070 Fuel Gauge EVK can also be

used as an evaluation board for both the DA9070 and DA9231.

This document describes the system diagram, the various functional sections on the EVK board, and

board set-up for chip evaluation and fuel gauge development.

Two GUIs are provided with the DA9070 Fuel Gauge EVK:

1) The DA9070 Fuel Gauge EVK, SmartCanvas GUI, communicates with both the DA9070 and the

DA9231. It also has a fuel gauge display and can control the on-board loads. This GUI is used for

evaluation purposes.

2) The Power Profile Manager (PPM). This GUI generates or loads battery profile data and runs the

fuel gauge performance test. This GUI is used to develop a software fuel gauge based on the user's

battery.

Default Settings

The DA9070 settings are loaded from the on-board MCU at startup, including charge current and

voltage settings:

Buck output: 2.0V, enabled

In the default configuration, the buck output voltage powers the MCU. If a different output

voltage is required, change the J24 position to 3.3V. This allows the Buck voltage to be modified as

needed. However, the GUI fuel gauge function will not be accurate in this configuration.

Boost output: 12V, disabled

Charge current: 40mA

Charge voltage: 4.2V

LDO outputs:

All LDO voltages are set to 0.8V initially, but the voltage may change if load settings are

changed in the GUI load profile tool. If the load profile tool is not used, LDO output settings

may be changed manually in the GUI.

Battery Information:

The battery profile for the included 80mAh battery is pre-loaded in the MCU. This includes

capacity, charge current, state of charge (SOC) lookup table, and other data. The pre-set

battery data can only be changed by first running the Power Profile Manager software.

A battery other than the one included can be used for evaluation without changing the profile.

However, charging settings must be changed manually in the GUI.

Also, the GUI based fuel gauge will not be accurate unless a new profile is updated and

saved to the MCU.

Refer to AN-SW-121 for details about the battery profiling procedure.

User Manual

Revision 2.1

4 of 18

NDA Confidential

28-Oct-2018