National Semiconductor bq27411, User Manual

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bq27411-Based Circuit Module
3 SLUUAP3A – January 2014 – Revised July 2016
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Copyright © 2014–2016, Texas Instruments Incorporated
bq27411 EVM: System-Side Impedance Track™ Technology
2 bq27411-Based Circuit Module
The bq27411-based circuit module is a complete and compact example solution of a bq27411 circuit for
battery management. The circuit module incorporates a bq27411 battery fuel gauge integrated circuit (IC)
with all other components necessary to accurately predict the capacity of a 1-series Li-ion cell.
2.1 Circuit Module Connections
Contacts on the circuit module provide the following connections:
• Direct connection to the battery cell (J1): CELL+, CELL–
• The serial communications port (J3): SDA, SCL, and VSS
• The load and charger connect across pack connector (J2): PACKP and PACKN
• Access to the programming pin (J7): EXTPROG and VSS
• External connect to I
2
C pullup voltage (J4): EXTPU and VSS
2.2 Pin Description
Pin Name Description
PACK+ Charger/load positive terminal
PACK– Charger/load negative terminal
SDA I
2
C communication data line
EXTPU External I
2
C pullup connection
SCL I
2
C communication clock line
VSS Signal return for communication line, shared with charger and ground
CELLP Cell positive terminal
CELLN Cell negative terminal
EXTPROG Power connection for OTP programming
3 Circuit Module Physical Layout, Bill of Materials and Schematic
This section contains the board layout, bill of materials, and schematic for the bq27411 circuit module.
3.1 Board Layout
This section shows the printed-circuit board (PCB) layers ( Figure 1 through Figure 3 ), and assembly
drawing for the bq27411 module.
Figure 1. bq27411EVM Layout – Top Silk