Features
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2
Bill of Materials
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Performance Specification Summary
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Circuit Module to EV2300 Connections
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1
Features
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Complete evaluation system for the bq27520 gas gauge with Impedance Track™ technology
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Populated circuit module for quick setup
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Personal computer (PC) software and interface board for easy evaluation
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Software that allows data logging for system analysis
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Ability to upgrade to the latest firmware version by flash reprogramming
1.1
Kit Contents
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bq27520 circuit module (HPA568)
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EV2300 PC interface board
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USB connection cable to interface board
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NTC103AT thermistor
This EVM is used for the evaluation of different bq27520-based products. Ensure that you visit the product
Web folder at
to download the latest firmware version, evaluation software, and
documentation for the associated product to be evaluated.
1.2
Ordering Information
Table 1. Ordering Information
EVM PART NUMBER
CHEMISTRY
CONFIGURATION
CAPACITY
bq27520EVM
Li-ion
1 cell
Any
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bq27520-Based Circuit Module
The bq27520-based circuit module is a complete and compact example solution of a bq27520 circuit for
battery management. The circuit module incorporates a bq27520 battery gas gauge integrated circuit (IC)
and all other components necessary to accurately predict the capacity of 1-series Li-ion cell.
2.1
Circuit Module Connections
Contacts on the circuit module provide the following connections:
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Direct connection to the battery pack (J2 or J3): PACK+, PACK–, and TS
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To the serial communications port (J8): SDA, SCL, and VSS
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The system load and charger connect across charger and load (J6 and J7): CHARGER–/LOAD– and
/LOAD+.
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Access to signal outputs (J5): SOC_INT, BAT_GD, and BAT_LOW
2.2
Pin Descriptions
PIN NAME
DESCRIPTION
PACK+
Pack positive terminal
PACK–
Pack negative terminal
TS
Pack thermistor input that leads to IC TS pin
SDA
I
2
C™ communication data line
SCL
I
2
C communication clock line
VSS
Signal return for communication line, shared with charger and ground
CHG+/LOAD+
High potential of load or charger connection
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bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology
SLUU426 – June 2010
Copyright © 2010, Texas Instruments Incorporated