Freescale Semiconductor
Advance Information
Document Number: MC34825
Rev 2.0, 3/2010
Micro-USB Interface IC
Supporting Universal Charging
Solution and Wired Accessories
34825
The 34825 is designed to support the Universal Charging Solution
INTERFACE IC
(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
(PB-FREE)
switches to multiplex the 5 pins, to support UART and high speed USB
98ASA00037D
20-PIN QFN
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.
ORDERING INFORMATION
The 34825 monitors both the VBUS status and the resistance
between the ID pin and the ground to identify the accessory being
Temperature
Device
Package
Range (T
A
)
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
3mm X 3mm
MC34825EP/R2
-40°C to 85°C
assigned to buttons in a cord remote controller or to identification (ID)
UTQFN
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 I
2
C serial bus for further actions.
When the accessory is detached from the cell phone, an interrupt signal
is also sent to inform the host.
Features
• Identifies various types of power supplies to set low or high
• Supports 32 ID resistance values with a high accuracy 5-
battery-charging-current levels
bit ADC
• Internal power switch to offer OVP against up to 28 V
• Accessory attachment and detachment detection with an
failed power supply input
interrupt signal to the host IC
• Supports stereo/mono headset with or without microphone
• I
2
C interface
and remote controller with pure passive components
• 10
μA
quiescent current in Standby mode
• Supports USB or UART R/D test cables
• Pb-free packaging designated by suffix code EP
• High speed (480 Mbps) USB 2.0 compliant
Baseband
GPIO
I2C
UART
USB XCVR
AUDIO
34825
VDDIO
INT
I2C_SDA
I2C_SCL
RXD
TXD
D+
D-
SPK_L
SPK_R
MIC
VDD
LI+
Charger
ISET
OUT
VBUS
ID
DP
DM
GND
V
BUS
ID
D+
D-
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.
FREESCALE [ FREESCALE SEMICONDUCTOR, INC ]
