ST AN3395 Application note Sensing resistor selection usage in STC310x battery monitoring applications handbook

This document describes the sensing resistor selection, power considerations, and layout recommendations for the STC310x series battery monitor ICs.

Brand: STMicroelectronics
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 11
File format: PDF
File size: 149 KB
Published: 06 August, 2012
Updated: 01 October, 2023
MD5 checksum: B249C261E5F42104A373A562B4836E33
PDF: ST AN3395 Application note Sensing resistor selection usage in STC310x battery monitoring applications handbook PDF

About this manual

This document provides guidelines for selecting the sensing resistor (Rcg) used with STC310x battery monitor ICs in gas gauge applications. It details the rules for choosing resistance values based on maximum peak current, power rating, and ADC code usage efficiency. An example calculation is provided to illustrate the selection process for a mobile phone application.

What's inside

STC310x external components
Rcg resistance selection
Maximum peak current
Power rating of the resistor
ADC code usage efficiency
Rcg power loss consideration
Rcg layout considerations
Capacitive filtering

Specifications

Maximum voltage drop on sensing resistor	±80 mV
Minimum voltage drop for ADC efficiency	> 40 mV

Frequently asked questions

What is the maximum voltage drop allowed on the sensing resistor?

The voltage drop across the Rcg resistor must not exceed ±80 mV.

How should the sensing resistor be placed on the PCB?

Place the resistor as close as possible to the CG pin to minimize voltage drop errors on the traces.

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