EA-OEM-306 Embedded Artists, EA-OEM-306 Datasheet - Page 45

• Manufacturer Part Number: EA-OEM-306
• Description: KIT LPC3152 SODIMM 66X48 200POS
• Manufacturer: Embedded Artists
• Type: MCUr

Specifications of EA-OEM-306

• Contents: Base Board, Cable, Headset, OEM Board, Serial Number
• For Use With/related Products: LPC3152
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
LPC3152_3154
Preliminary data sheet
7.4 USB charge pump (host mode)
7.5 Power Supply Unit (PSU)
The USB charge pump uses the Li-ion battery to provide a low-power USB VBUS signal
for the USB controller in host mode.
The integrated PSU allows the system to run directly from the battery voltage or the USB
power supply voltage USB_VBUS. It converts the battery voltage or the USB_VBUS
voltage into the supply voltages required for both the digital and analog blocks in the rest
of the system.
•
•
•
•
The nominal charge current is programmed with an external program-resistor. This
allows the charge current to be adapted to the USB enumeration.
Uses a widespread method to charge a Li-ion battery with the following stages:
– Trickle charging with a small current for an (almost) empty battery.
– Fast charging in Constant Current mode (CC mode) to the maximum battery
– Switch from CC mode to Constant Voltage charging (CV mode) keeping the battery
Short circuit resistant.
Charger state can be observed through a register.
voltage of 4.2 V ± 1%.
voltage at 4.2 V and monitoring the current for ending the charge process.
All information provided in this document is subject to legal disclaimers.
Rev. 0.12 — 27 May 2010
LPC3152/3154
© NXP B.V. 2010. All rights reserved.
45 of 88