Document Number: MC34825
Rev 2.0, 3/2010
Freescale Semiconductor
Advance Information
Micro-USB Interface IC
Supporting Universal Charging
Solution and Wired Accessories
34825
The 34825 is designed to support the Universal Charging Solution
(UCS) recommended by the OMTP (Open Mobile Terminal Platform),
as well as to use the same 5-pin micro or mini-USB connector for other
wired accessories. The 34825 supports various types of external power
supplies, such as a dedicated ac/dc adapter or a USB port, to charge
the battery. It has functions built in to identify the type of the power
supply, and sets low or high charging current, based on the current
capability of the power supply. The 34825 monitors the power supply,
and offers an up to 28 V of over-voltage protection (OVP) to the cell
phone against failed power supplies. The 34825 also contains analog
switches to multiplex the 5 pins, to support UART and high speed USB
data communication, mono or stereo audio headset with or without a
microphone and a cord remote controller, manufacturing or research-
and-development (R/D) test cables, and other accessories.
INTERFACE IC
(PB-FREE)
98ASA00037D
20-PIN QFN
ORDERING INFORMATION
The 34825 monitors both the VBUS status and the resistance
between the ID pin and the ground to identify the accessory being
plugged into the mini or micro-USB connector. A high-accuracy 5-bit
ADC is offered to distinguish 32 levels of ID resistance that are
assigned to buttons in a cord remote controller or to identification (ID)
resistors of accessories. After identifying the attached accessory, the
34825 sends an interrupt signal to a host IC and the host IC can
configure the analog switches via an I2C serial bus for further actions.
When the accessory is detached from the cell phone, an interrupt signal
is also sent to inform the host.
Temperature
Package
Device
Range (T )
A
3mm X 3mm
MC34825EP/R2
-40°C to 85°C
UTQFN
Features
• Identifies various types of power supplies to set low or high
battery-charging-current levels
• Supports 32 ID resistance values with a high accuracy 5-
bit ADC
• Internal power switch to offer OVP against up to 28 V
failed power supply input
• Supports stereo/mono headset with or without microphone
and remote controller with pure passive components
• Supports USB or UART R/D test cables
• High speed (480 Mbps) USB 2.0 compliant
• Accessory attachment and detachment detection with an
interrupt signal to the host IC
• I2C interface
• 10 μA quiescent current in Standby mode
• Pb-free packaging designated by suffix code EP
Baseband
GPIO
34825
VDDIO
INT
I2C_SDA
I2C_SCL
RXD
VDD
Charger
LI+
I2C
UART
ISET
TXD
OUT
D+
D-
V
VBUS
BUS
USB XCVR
SPK_L
SPK_R
MIC
ID
DP
ID
AUDIO
D+
D-
DM
GND
GND
USB Connector
Figure 1. 34825 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2010. All rights reserved.
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