On Tue, Jan 17, 2023, 22:16 MC_Sequoia <[email protected]> wrote:
> You want to a guess what the MaxPower is listed for the Logitech V20 > portable usb speakers are that are plugged into my pc? > > I'll give you one guess. > > Yep, MaxPower is listed as 590 mA > > "The USB 1.x and 2.0 specifications provide a 5 V supply on a single wire > to power connected USB devices. > > A unit load is defined as 100 mA in USB 2.0, and 150 mA in USB 3.0. A > device may draw a maximum of 5 unit loads (500 mA) from a port in USB 2.0; > 6 (900 mA) in USB 3.0." > > "Bus 003 Device 002: ID 046d:0a04 Logitech, Inc. V20 portable speakers > (USB powered) > Device Descriptor: > bLength 18 > bDescriptorType 1 > bcdUSB 1.10 > bDeviceClass 0 > bDeviceSubClass 0 > bDeviceProtocol 0 > bMaxPacketSize0 8 > idVendor 0x046d Logitech, Inc. > idProduct 0x0a04 V20 portable speakers (USB powered) > bcdDevice 0.07 > iManufacturer 1 Logitech > iProduct 2 Logitech USB Speaker > iSerial 0 > bNumConfigurations 1 > Configuration Descriptor: > bLength 9 > bDescriptorType 2 > wTotalLength 0x00e9 > bNumInterfaces 3 > bConfigurationValue 1 > iConfiguration 3 G6 2005/03/29 10:05 > bmAttributes 0xc0 > Self Powered > MaxPower 500mA > > > The total RMS Power of the Logitech V20 Portable USB Speakers = 2 W or > 2000 mA. > . > Yikes, since when 2W at 5V is 2000mA? -Tomas >
