MC34825EPR2 Freescale Semiconductor, MC34825EPR2 Datasheet - Page 22

• 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

VBUS pin from both the input decoupling capacitor and the
input quiescent current of the charger IC connected to the
OUT pin, so that the microphone signal can be connected to
the VBUS pin without any interference from the OUT pin. The
power MOSFET is also used as the input Over-voltage
Protection (OVP) or Over-current Protection (OCP) switch for
other components in the cell phone, such as the charger IC,
OVER-VOLTAGE PROTECTION (OVP)
The 34825 protects the cell phone by turning off the internal
power MOSFET when the VBUS voltage is higher than the
OVP threshold. In this case, the 34825 turns off the power
MOSFET within 1.0 μs after the input voltage exceeds the
OVP threshold, and the OVP_EN bit in the Interrupt register
is set to interrupt the host IC. When the OVP event is cleared,
the OVP_OTP_DIS bit in the Interrupt register is set to inform
the host IC.
OVER-CURRENT PROTECTION (OCP) AND OVER-
TEMPERATURE PROTECTION (OTP)
the specified OCP limit, the 34825 will operate in CC
AUDIO ACCESSORY SUPPORTING REMOTE
CONTROLLER (R/C ACCESSORY)
remote controller, as listed in
with a remote controller is an audio headset that has a stereo
speaker, a micro phone, and a remote controller, as shown in
Figure
are assigned in
included in the accessory, the corresponding pins should be
left floating. For example, if the microphone is not included in
the stereo headset, VBUS pin should be left floating in the
headset.
key is pressed for a time less than 20 ms, the 34825 ignores
this key press. If the key is still pressed after 20 ms, 34825
starts a timer to count the time during which the key is
pressed. There are three kinds of key press conditions
according to the pressing time: error key press, short key
press, and long key press.
22
34825
FUNCTIONAL DEVICE OPERATION
OPERATION AFTER IDENTIFICATION
1. Error key press: if the key pressing time is less than
2. Short key press: if the key pressing time is between
The VBUS line is capable of withstanding a 28 V voltage.
If the current flowing through the power MOSFET exceeds
Two ID resistors are designated for accessories with a
The timing of the key pressing is shown in
T
T
The ADC result holds the key value. The INT outputs
KP
KP
16. The five pins in the mini or micro-USB connector
, The 34825 ignores this key press.
and T
LKP
Figure
, the KP bit is set to inform the host IC.
16. If some components are not
Table
21. A typical accessory
OPERATION WITH ACCESSORIES
Figure
17. If a
PROTECTION
to allow a low voltage rated charger IC to be used for cost
reduction.
VBUS power mode even when the VDD voltage is below
V
be charged when the battery is fully discharged.
(Constant Current) mode, regulating the output current at the
OCP limit. If the OCP condition persists, the IC temperature
will rise, eventually reaching the Over-Temperature-
Protection (OTP) limit. The 34825 then turns off the power
MOSFET and sets the OTP_EN interrupt bit in the Interrupt
register to inform the host IC. The power MOSFET is turned
on again when the IC temperature falls below the OTP falling
temperature threshold, and the OVP_OTP_DIS bit is set. If
the above case happens repeatedly 7 times, the power
MOSFET will be permanently turned off until the accessory is
detached or the IC is reset.
under the OTP case to prevent a high overshoot voltage at
the VBUS pin.
be forced into the Power Save mode or automatically enter
into the Power Save mode. This is controlled by the
AutoPSAVE bit in the Control register.
SPK_L and SPK_R pins in 10 seconds, the 34825 enters the
Power Save mode automatically to minimize the quiescent
current. Upon detecting the activity in audio signal switches,
the 34825 returns to the Active mode. When AutoPSAVE = 0,
the host IC can control the mode of 34825 manually by
setting the PSAVE bit in the Device Mode register via I
well.
VDDPOR
3. Long key press: if the key pressing time is longer than
The power MOSFET is guaranteed to be turned on in
The power MOSFET is turned off with a limited speed
When such a accessory is attached, the 34825 can either
When AutoPSAVE = 1, if no activity is detected at the
In the Power Save mode, the key pressing is monitored as
low impedance when the key is released and returns to
a high impedance, due to the clearance of the KP bit
when the interrupt register is read.
T
is set to inform the host IC. The host IC needs to
respond to the key press immediately. The ADC result
holds the key value. When the key is released, the long
key release bit LKR in the Interrupt register is set to
interrupt the host IC again. The ADC Result register
still has the key value.
LKP
threshold, to ensure that the cell phone battery can
, the long key press bit LKP in the Interrupt register
Analog Integrated Circuit Device Data
Freescale Semiconductor
2
C.