Charles,
CM: The USB detection is to decide what input current limit the IC should set on power up as per table 2 in the data sheet.
MS >> I know it and I did notask about it.
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CM: At any time a host can program the input current limit from 100mA to 3A. The output current is basically the input voltage divided by the battery voltage times the efficiency so it will be somewhat higher than the input current limit.
MS >> I know it and I did not askabout it.
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CM: I am not sure what you concern is about the 1.5A from USB??
MS >> This is not my concern and I did notaskabout it.
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CM: From the point of view from the power supply , the charger is capable of delivering all the input power to the output at a good efficiency, assuming the IC is programmed correctly. The TI part also have may safety and protection features that seamlessly keep the system powered either by the input source or the battery.
MS >> I know it and I did notaskabout it.
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CM: I do not have any high speed USB communication application "eye' charts, with our charger's D+D- pins connected or I would share it with you.
MS >> My question was about FULL speed USB communication (not about HIGH speed) with a charger and USB host connected together to the same USB port (D+/D-).
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CM: Does your application have a USB transceiver? Is it powered from the SYS output? Can the transceiver communicate with the USB host? Do you need the D+D- detection?
MS >> Yes, it has a USB transceiver. Yes, it is powered from SYS output. Yes, the transceiver communicate with the USB host (ideally using the same USB port as a charger). Yes, I need the D+D- detection.
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CM: Will the bq24192 work for you?
MS: This is my question. The DS does not say anything about using this charger with a USB host connected to the same USB port. My USB host is MSP430F5659IPZR.
Thanks,
Myron