EVB-UCS1002 Evaluation Board User Manual
SMSC EVB-UCS1002
29
Revision 1.1 (09-30-11)
PRELIMINARY - SMSC CONFIDENTIAL
7.4
Current Monitoring and Charge Rationing
To view current monitoring and current rationing, perform the following on the Main Tab:
1. Set a Ration Limit. The ration limit is in units of mA-h (electric charge).
2. Set Rationing Behavior. The Ration Completion Behavior defaults to “Report and Disconnect”.
Once the Ration Limit is reached, portable device charging will cease, the ALERT# pin will assert,
and the Ration Complete bit will be set. If you do not want the system to behave in this fashion,
select one of the other three options: Report, Report & Sleep, and Take No Action.
3. Connect VS to the EVB (see
Section 3.6, "Jumper Settings"
). The VS Low indicator on the Main
Tab must be dark. If the VS Low indicator is red, the voltage is not high enough to charge a portable
device.
4. Connect a portable device to the EVB. Use the OEM USB charging cable that came with the
portable device.
5. Enable Rationing. Place a checkmark in the Ration Enable box on the Main Tab.
6. Watch the GUI as the device starts charging.
shows the GUI after the ration limit was
reached (in the case of “Report & Disconnect”).
Note:
As shown in
, the green trace is the instantaneous current and the red diagonal line
is the charge being delivered in mA-h. Both are also presented in numeric format in the bottom
left boxes. Trace color and characteristics can be change by clicking on the waveform boxes
to the left of these numerical values.
Figure 7.5 Main Tab - Ration Limit Reached
