RT9428WSC datasheet(3/14 Pages) RICHTEK

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RT9428

DS9428-01

October 2014

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Function Block Diagram

Operation

12-bit ADC

Analog-to-Digital Converter. It converts the voltage input

from VBAT pin to target value.

Battery OCV Model

Parameters for battery characteristics.

Voltaic Gauge Algorithm

The RT9428 calculates and determines that the embedded

Fuel Gauge calculates and determines the Li+ battery

SOC according to battery voltage only.

The algorithm estimates the increasing or decreasing SOC

by an iteration model according to the difference between

battery voltage and the battery OCV. The dynamic voltaic

information can effectively emulate the Li+ battery behavior

and determines the SOC (%), but can't report capacity (mAh).

Controller

The controller takes care of the control flow of system

routine, ADC measurement flow, algorithm calculation and

alert determined.

2C Interface

The fuel gauge registers can be accessed through the I

Interface.

Interface

SDA

GND

SCL

Controller

Voltaic Gauge

Algorithm

Battery

OCV Model

ALERT

12-bit

ADC

VBAT

VDD

TEST

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