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Test Summary
Figure 12. The Waveforms at I
(bat)
= 3 A
Enable the output of the electronic load.
Measure
→
I
(sys)
= 2500 mA
±
200 mA, I
(bat)
= 3000 mA
±
200 mA, I
I
= 4300 mA
±
300 mA
Disable the output of the electronic load.
Type 3000 (mA) in the Input Current Register and click Write.
Enable the output of the electronic load.
Measure
→
I
(sys)
= 2500 mA
±
200 mA, I
(bat)
= 500 mA
±
300 mA, I
I
= 3000 mA
±
400 mA
Measure
→
V(J4(IOUT)) = 100 mV
±
80 mV
Change the B3 bit (IOUTBT) of the Control Register to 0. (adapter current output). Click Write.
Measure
→
V(J4(IOUT)) = 600 mV
±
30 mV
Click Read All
Observe
→
The B4 bit (NoDPM) of the Status Register turns green (DPM loop active). The window
should be like
SLUU237 – January 2006
bq24720/21 EVM (HPA104) for Multi-Cell Synchronous
15
Switch-Mode Charger With System Power Selector and SMBus SBS-Like Interface