Apple has reduced the amount of power that the iPad’s 30-pin connector can emit from 100mA to 20mA. The good part about this is that your iPad’s battery will probably last longer but the downside is that Apple’s iPad Camera Connection Kit is crippled for many people. The Apple iPad Camera Connection Kit includes two adapters: 1 USB connector and 1 SD card reader.
The core issue is that connected devices that require power of more than 20mA will no longer work. That means that many USB keyboards (Apple’s included) as well as USB flash drives will no longer work with the iPad. When the user connects a device that is not self-powered and requires more than 20mA of power from the iPad they get the following alert: “The connected USB device requires too much power.”
This problem not only pertains to camera-related devices but also is an issue for microphones. USB microphones were compatible with the iPad running iOS 3.2.2 but now some of them apparently use more than 20mA of the iPad’s power. Although many users are unhappy that they cannot use many of their USB flash drives, USB keyboards, or USB microphones anymore, users are even angrier that many of their USB cameras no longer work with the iPad.
The Apple iPad Camera Connection Kit’s USB adapter was built so users with USB cameras could plug their cameras in via USB on the go. Now they cannot anymore as most USB cameras require too much power from the iPad. This issue is unpleasant for photographers relying on the iPad to import and upload their photos on the fly.
So far the issue seems to persist in firmware 4.3 and in iPad 2.
