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TUSB2046B功耗问题

Other Parts Discussed in Thread: TUSB2046B

我们的客户使用TUSB2046B用于Portable产品,现测试时发现电流比较大,我查了规格书,Normal operation电流是40mA,suspend电流为1uA.

根据USB 2.0协议,hubroot hub会一直周期性地发送SOF(Start Of Frame,全速USB1ms发送一个,高速USB则是125us发送一个),那么设备在什么情况下才能进入挂起状态?

因为是电池供电,TUSB2046B做低功耗的使用,有什么好的建议,谢谢!