MC34825EPR2 Freescale Semiconductor, MC34825EPR2 Datasheet - Page 24

• Manufacturer Part Number: MC34825EPR2
• Description: IC USB MINI UNIV CHARGING 20QFN
• Manufacturer: Freescale Semiconductor
• Type: USB Interface ICr

Specifications of MC34825EPR2

• Controller Type: USB Peripheral Controller
• Interface: Micro-USB
• Voltage - Supply: 2.7 V ~ 5.5 V
• Current - Supply: 100mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-UFQFN Exposed Pad
• Usb Version: 2.0
• No. Of Ports: 1
• Supply Voltage Range: 2.7V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• No. Of Pins: 20
• Msl: MSL 3 - 168 Hours
• Peak Reflow Compatible (260 C): Yes
• Rohs Compliant: Yes
• Leaded Process Compatible: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

USB HOST (PC OR HUB)
pin is floating. The power MOSFET is turned on to allow the
charger to charge the battery. The ISET outputs default high
impedance to limit the charging current to a lower level. The
host IC can turn on the D+ and D- switches and then pull the
D+ signal to high to start the USB attaching sequence.
USB CHARGER OR DEDICATED CHARGER
Dedicated Charger, the 34825 turns on the power MOSFET
to allow the charger to start. The host IC can set the ISET
outputs low impedance to allow a higher charge current.
5-WIRE CARKIT CHARGER (TYPE 1 OR TYPE 2)
936-A USB Carkit Specification. The 5-wire carkit charger
outputs 5V to the VBUS pin, has the D+ and D- pins shorted
internally, and has an ID resistor. The ID resistor has a value
power detection threshold or the ID resistor is removed, a
detaching detection flow starts.
detection flow. When the DETACH bit is set, the INT outputs
low voltage to inform the host IC. At the end of the detaching
HARDWARE RESET
IC. As the
24
34825
FUNCTIONAL DEVICE OPERATION
LOGIC CONTROL FEATURES
When the attached accessory is a USB host or hub, the ID
When the attached accessory is a USB Charger or a
A 5-wire carkit charger is a charger specified in the CEA-
When either the VBUS voltage drops below the VBUS
The 34825 has three sources for hardware resetting the
Figure 19
shows, the sources include the Power-
Figure 18
Figure 18. The Detachment Detection Flow
shows the detailed
No
VBUS_DET bit
LOGIC CONTROL FEATURES
DETACH bit
ATTACH bit
ACTIVE bit
VBUS=5V
Removed
VBUS
DETACHING DETECTION
Clear
Clear
Clear
Set
Yes
RESET
of either 200kΩ or 440kΩ to distinguish the current capability
of the charger. Refer to the CEA-936-A USB Carkit
Specification for more information.
the 34825 turns on the power MOSFET to allow the Li-ion
battery charging function to start. The host can set the ISET
outputting high impedance or low impedance to choose the
charge current.
RESERVED ACCESSORY
in
specific accessory is attached, the identification flow will
identify the ID resistance and as well as the power supply
type in case of a powered accessory. The ADC Result
register and the Status register contain the information of the
R
these registers to distinguish the type of the accessory for
further actions.
detection flow, the ACTIVE bit is cleared and the 34825
enters the Standby mode. A new identification flow will start
if either the VBUS voltage is above its POR threshold or the
ID resistor is connected.
On-Reset caused by the rising VDD, a hardware reset
caused by the VDDIO input and a hardware reset using the
I
2
ID
C bus lines. The Power-On-Reset is described earlier. The
Table 21
When the attached accessory is a 5-wire carkit charger,
The users can assign the reserved ID resistor values listed
value and the power supply type. The baseband can read
No
ID_FLOAT bit
Connected
to their user specific accessories. When a user
ID Float
RID
Set
Yes
Analog Integrated Circuit Device Data
Freescale Semiconductor