I'm working on a USB device that will need to be powered during "Global Sus pend" and will draw around 150mA of current - this maybe reduced to around95mA. I'm getting confused about suspend current rules. Note that the devic e does Not require USB Certification, I just want it to work with 99% of th e PCs (Desktops and laptops) in the market with USB 2.0 ports.
- The suspend current limit is 2.5mA, but I also read that battery powered devices can draw upto 100mA in suspend mode. Is this true? If yes, Is the 'battery powered' aspect enforced during device enumeration or is that only used for USB compliance testing? i.e. since I'm not interested in USB cert ification, can I enumerate my device as an HID Mouse and still draw 100mA d uring suspend?
- In your experience, do most hubs/host controllers enforce USB suspend cu rrent limit? what seems to be the max safe current draw during suspend...10