V
VM#1
Windows
PC
EV2300/
2400
Power
Supply
PS#1
V
VM#4
V
VM#5
VM#2
VM#3
V
VM#6
AGND
AGND
V
V
Battery
Simulator
BS#1
Battery
Simulator
BS#2
Test Summary
5
SLUUC12 – February 2019
Copyright © 2019, Texas Instruments Incorporated
BQ25887 QFN boost-mode battery charger with cell balancing evaluation
module
Advance Information
2.2
Charge Mode
2.2.1
Charge Mode Test Setup
Use the following list to set up the equipment for charge mode operation:
1.
shows the test setup for BQ25887 when in charge (boosting) mode including jumper settings
per
. Ensure that the power supply and battery simulator are turned off before connecting to the
EVM.
Figure 1. BQ25887 Charge Mode Test Setup
2. Voltmeters 1 through 3 (VM1, VM2, and VM3) connect to Kelvin test points for measuring VBUS, SYS,
and BAT as close to the IC pins as possible. Voltmeters 4 through 6 measure the voltage across 0.01
Ω
, which gives the current.
3. Before attaching to the EVM, set battery simulator 1 (BS#1) and battery simulator 2 (BS#2) no higher
than 3.8V and at a 2.5-A current limit and set power supply 1 (PS#1) for 5.5 V and a 3.5-A current
limit.
4. Turn off BS#1, BS#2 and PS#1 then attach BS#1 to the J4 (BAT, TOP-/BOT+) terminal and BS#2 to
TOP-/BOT+ (J4) and PGND (J5) terminal of the EVM and attach PS#1 to J1 (VBUS, GND) of the
EVM.
5. With the EV2400 connected to the PC and the EVM, launch
Battery Management Studio
(bqStudio).
Select
Charger
and the BQ25881 or BQ25887 evaluation software.
2.2.2
Charge Mode I2C Register Setup
2.2.2.1
BQ25887EVM
1. Turn on BS#1 and BS#2 and set for 3.8 V on each of the BS.