Technical data

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Document Number: MC34825

Rev 4.0, 9/2014

Freescale Semiconductor

Technical Data

Micro-USB Interface IC

Supporting Universal Charging

Solution and Wired Accessories

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 to charge the battery, such as a dedicated AC/DC adapter or

a USB port. 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 overvoltage protection (OVP) to the cell

phone against failed power supplies. The 34825 also contains analog

switches to multiplex the five 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.

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 I

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. This device is powered using

SMARTMOS technology.

Features

• Identifies various types of power supplies to set low or high battery-

charging current levels

• 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

• Supports 32 ID resistance values with a high accuracy 5-bit ADC

• Accessory attachment and detachment detection with an interrupt

signal to the host IC

•I

C interface

•10 A quiescent current in Standby mode

Figure 1. 34825 Simplified Application Diagram

INTERFACE IC

34825

(PB-FREE)

98ASA00716D

20-PIN QFN

Applications

• Cell phones

• MP3/MP4 players

• Portable voice recorders

• USB universal charging solution (USC-OMTP)

• Supports mini/micro - USB connector

• UART and USB high speed communication

• Remote control/accessories IDs

I2C

VDDIO

I2C_SCL

Baseband

34825

I2C_SDA

INT

RXD

D-

TXD

D+

SPK_L

SPK_R

MIC

ISET

OUT

VBUS

VDD

GND

Charger

GPIO

UART

USB XCVR

AUDIO

BUS

D+

D-

GND

USB Connector

LI+

Summary of content (39 pages)

PAGE 1
Freescale Semiconductor Technical Data Document Number: MC34825 Rev 4.0, 9/2014 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.
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ORDERABLE PARTS ORDERABLE PARTS Table 1. Orderable Part Variations Part Number (1) Temperature (TA) Package MC34825EP -40 °C to 85 °C 3.0 mm x 3.0 mm UTQFN Notes 1. To order parts in Tape and Reel, add the R2 suffix to the part number.
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INTERNAL BLOCK DIAGRAM INTERNAL BLOCK DIAGRAM VDDIO Reset OSC Internal Supplies VBUS Detect I2C_SDA 2 I C_SCL INT RXD TXD I2 C Interface Interrupt VDD VBUS Gate Drive & OCP Registers and State Machine OUT ISET DP UART Switches DM ID D+ DSPK_R SPK_L MIC USB Switches ID ADC Audio Switches ID Detect VBUS GND Figure 2.
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PIN CONNECTIONS DP DM VBUS ISET 20 19 18 17 16 SPK_R 1 15 OUT SPK_L 2 14 I2C_SCL MIC 3 13 I2C_SDA D+ 4 12 INT D- 5 11 VDD 6 7 8 9 10 TXD NC VDDIO NC 21 GND RXD TRANSPARENT TOP VIEW ID PIN CONNECTIONS Figure 3. 34825 Pin Connections A functional description of each pin can be found in the Functional Pin Description section on page 14. Table 2.
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PIN CONNECTIONS Table 2.
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ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS MAXIMUM RATINGS Table 3. Maximum Ratings Exceeding these ratings may cause a malfunction or permanent damage to the device. Ratings Symbol Value Unit ELECTRICAL RATINGS Input Voltage Range VBUS Pin V OUT Pin SPK_L, SPK_R, DP, and DM Pins VBUS -0.3 to 28 VOUT -0.3 to 8.0 -2.0 to VDD+0.3 All Other Pins -0.3 to 5.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 4. Static Electrical Characteristics Characteristics noted under conditions VDD = 3.6 V, VBUS = 5.0 V, VDDIO = 3.0 V, -40 °C  TA  85 °C (see Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VDD = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit VDD 2.7 - 5.5 V - 2.5 2.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 4. Static Electrical Characteristics (continued) Characteristics noted under conditions VDD = 3.6 V, VBUS = 5.0 V, VDDIO = 3.0 V, -40 °C  TA  85 °C (see Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VDD = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max RSPK_ON - 1.6 3.0 RSPK_ONMCT - 0.05 0.15 RSPK_ONFLT - 0.01 0.
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ELECTRICAL CHARACTERISTICS STATIC ELECTRICAL CHARACTERISTICS Table 4. Static Electrical Characteristics (continued) Characteristics noted under conditions VDD = 3.6 V, VBUS = 5.0 V, VDDIO = 3.0 V, -40 °C  TA  85 °C (see Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VDD = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit - 2.3 - 1.9 2.0 2.1 30.4 32 33.6 IVCBL 1.0 1.2 1.
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ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 5. Dynamic Electrical Characteristics Characteristics noted under conditions VDD = 3.6 V, VBUS = 5.0 V, VDDIO = 3.0 V, -40°C  TA  85°C (see Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VDD = 3.6 V and TA = 25°C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max Unit tD2 7.0 8.5 10.2 tVDDDGT_F 1.7 2.5 3.
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ELECTRICAL CHARACTERISTICS DYNAMIC ELECTRICAL CHARACTERISTICS Table 5. Dynamic Electrical Characteristics Characteristics noted under conditions VDD = 3.6 V, VBUS = 5.0 V, VDDIO = 3.0 V, -40°C  TA  85°C (see Figure 1), unless otherwise noted. Typical values noted reflect the approximate parameter means at VDD = 3.6 V and TA = 25°C under nominal conditions, unless otherwise noted. Characteristic Symbol Min Typ Max I2C reset pulse width tRSTI2C 13.
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ELECTRICAL CHARACTERISTICS ELECTRICAL PERFORMANCE CURVES 2.2 Temperature =85°C 2.0 1.8 Temperature =25°C 1.6 1.4 -1.5 Temperature = -40°C -1.0 -0.5 0.0 0.5 1.0 1.5 MIC Switch On-Resistance ( ) SPK Switch On-Resistance ( ) ELECTRICAL PERFORMANCE CURVES 90 Temperature = 85°C 80 70 Temperature = 25°C 60 50 40 1.8 Temperature = -40°C 1.9 Input Voltage ( V) 9.6 VDD Supply Current ( A) 4.5 Temperature = 85°C 4.0 3.5 Temperature = 25°C 3.0 Temperature = -40°C 2.5 2.0 0.0 0.5 1.0 1.
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900 9.0 880 OUT Voltage (V) VBUS Supply Current ( A) ELECTRICAL CHARACTERISTICS ELECTRICAL PERFORMANCE CURVES 860 840 820 800 780 760 -40 7.5 6.0 4.5 3.0 1.5 -20 0 20 40 60 80 Temperature ( °C) Figure 10. VBUS Supply Current vs Temperature In VBUS Power Mode 0.0 0.0 1.5 3.0 4.5 6.0 VBUS Voltage ( V) 7.5 9.0 Figure 11.
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FUNCTIONAL DESCRIPTION INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCTION The 34825 is designed to support cell phones that adopt the micro or mini-USB connector as the sole wired interface between the cell phone and external accessories. Using the micro-USB connector for charging and USB data communication is required by the OMTP standard for the UCS. The 34825 further extends the micro-USB connector to support other accessories to eliminate all other mechanical connectors in a cell phone.
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FUNCTIONAL DESCRIPTION FUNCTIONAL PIN DESCRIPTION POWER OUTPUT (OUT) Output of the power MOSFET in the 34825. This pin is connected to a charger input. Bypass to ground with a 1.0 F capacitor. CHARGE CURRENT SETTING (ISET) D- OF THE USB CONNECTOR (DM) D- line of the mini or micro-USB connector. D+ OF THE USB CONNECTOR (DP) D+ line of the mini or micro-USB connector. Open-drain output to set the charge current according to the power supply current capability.
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FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION I2C Interface Logic Output Internal Power Supplies Switch Array Logic & State Machine VBUS Detection ID ADC ID Detection Figure 12. 34825 Functional Internal Block Diagram INTERNAL POWER SUPPLIES SWITCH ARRAY This block contains the bias power supplies to the internal circuits. The inputs to this block include VBUS, VDD and VDDIO.
PAGE 17
FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES FUNCTIONAL DEVICE OPERATION OPERATIONAL MODES The 34825 has five operational modes: Power Down mode, VBUS Power mode, Standby mode, Active mode, and Power Save mode. The mode transition diagram is given in Figure 13.
PAGE 18
FUNCTIONAL DEVICE OPERATION POWER-UP detecting audio signal activities or an accessory detachment. If the transition is caused by an accessory detachment, the 34825 moves from the Power Save mode to the Standby mode directly. Otherwise, it moves to the Active mode, and the configuration of the IC resumes to the same configuration before entering the Power Save mode.
PAGE 19
FUNCTIONAL DEVICE OPERATION ACCESSORY IDENTIFICATION ACCESSORY IDENTIFICATION Accessories are categorized into two groups. Powered accessories are accessories that supply power to the VBUS pin while non-powered accessories do not. When the accessory is a powered one, the VBUS detection mechanism will check the connection between the D+ and the D- pins as part of the power supply type identification (PSTI). A powered accessory may or may not have an ID resistor.
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FUNCTIONAL DEVICE OPERATION ACCESSORY IDENTIFICATION VBUS=0V No ACTIVE = 0 ID Float VBUS Applied? ID Float? Yes Set DETACH bit Yes No Set VBUS_DET bit Clear ID_FLOAT bit Set ID_FLOAT bit Yes Set ADC RESULT Set ID_GND bit Yes ID shorted to GND? Yes No No ID Float? ADC = 00000? No Yes Delay TD time Yes Key Released? VBUS_DET =1? No DP->DM SHORT? ADC = Key Value? No Yes Yes Key Released within 1.
PAGE 21
FUNCTIONAL DEVICE OPERATION ACCESSORY IDENTIFICATION The ADC results are broken into two groups. The values between ‘00001’ to ‘01101’ are assigned to 13 remote-control keys for the two accessories that support remote controllers, as listed in Table 22. The rest of the ADC results are assigned to various accessories. If the ADC result is one of the remote control key values in the identification flow, it is possible that the remote control key is stuck when the accessory is attached.
PAGE 22
FUNCTIONAL DEVICE OPERATION OPERATION AFTER IDENTIFICATION OPERATION AFTER IDENTIFICATION The operation after the identification is dependent on the VDDIO voltage. The VDD voltage has to be higher than its POR threshold for the 34825 to perform the identification state machine. Once completed, the identification results are stored in the Status and the ADC Result registers and the ATTACH bit is set.
PAGE 23
FUNCTIONAL DEVICE OPERATION OPERATION AFTER IDENTIFICATION POWER MOSFET The SW8 in Figure 15 is a power MOSFET that controls the power flow from the VBUS input to the OUT pin. The power MOSFET serves two purposes.
PAGE 24
FUNCTIONAL DEVICE OPERATION OPERATION AFTER IDENTIFICATION VBUS AUDIO ACCESSORY D+ MIC Audio_R DAudio_L ID R1 R2 RN-1 R3 …... / SEND/END GND RN HOLD Figure 16. Audio Accessory with Remote Control and Microphone TKP 20 ms Key Press TLKP 20 ms 20 ms KP INT Interrupt Register read LKP LKR INT Interrupt Register read ADC Time Interrupt Register read Figure 17.
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FUNCTIONAL DEVICE OPERATION OPERATION AFTER IDENTIFICATION USB HOST (PC OR HUB) When the attached accessory is a USB host or hub, the ID 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.
PAGE 26
FUNCTIONAL DEVICE OPERATION LOGIC CONTROL FEATURES LOGIC CONTROL FEATURES RESET HARDWARE RESET The 34825 has three sources for hardware resetting the IC. As the Figure 19 shows, the sources include the PowerOn-Reset caused by the rising VDD, a hardware reset caused by the VDDIO input and a hardware reset using the I2C bus lines. The Power-On-Reset is described earlier. The reset caused by the VDDIO input or by the I2C bus lines belongs to system resets.
PAGE 27
FUNCTIONAL DEVICE OPERATION I2C SERIAL BUS INTERFACE tVDDIODGT_F Reset VDDIO Figure 21. Hardware Reset Using the VDDIO Input INTERRUPT There are eight interrupt sources in the 34825 causing an interrupt at the INT pin to the host IC. They are accessory attachment, accessory detachment, short-key press, long key press, long-pressed key release, VBUS voltage OVP, the IC temperature OTP, and either the OVP or the OTP condition is removed.
PAGE 28
FUNCTIONAL DEVICE OPERATION REGISTER MAP Figure 24. Master Reads After Setting Word Address (Write Word Address and then Read Data) Figure 25. Master Reads Slave Immediately after First Byte (Read Mode) REGISTER MAP Table 10.
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FUNCTIONAL DEVICE OPERATION REGISTER MAP Table 11.
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FUNCTIONAL DEVICE OPERATION REGISTER MAP Table 15. Timing Table (continued) Setting Value Key Press Long Key Press 0011 400 ms 600 ms 0100 500 ms 700 ms 0101 600 ms 800 ms 0110 700 ms 900 ms 0111 800 ms 1000 ms 1000 900 ms 1100 ms 1001 1000 ms 1200 ms 1010 - 1300 ms 1011 - 1400 ms 1100 - 1500 ms 1101 - - 1110 - - 1111 - - Table 16.
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FUNCTIONAL DEVICE OPERATION REGISTER MAP Table 18.
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FUNCTIONAL DEVICE OPERATION REGISTER MAP Table 21. Device Mode Register Bit Mode Symbol Reset Description 0 R/C RST 1 This bit indicates if a chip reset has occurred. This bit will be cleared once being read. 0: no. 1: Yes.
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TYPICAL APPLICATIONS APPLICATION INFORMATION TYPICAL APPLICATIONS APPLICATION INFORMATION ID RESISTANCE VALUE ASSIGNMENT Table 22. ID Resistance Assignment: (Unit: k) The ID resistors used with the 34825 are standard 1% resistors. Table 22 lists the complete 32 ID resistor assignment. The ones with the assigned functions filled are the ones that are already used with special functions. The ones reserved can be assigned to other functions. Table 22.
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TYPICAL APPLICATIONS TYPICAL APPLICATIONS DECOUPLING CAPACITOR Decoupling capacitors are required at all power supply input and output pins. For the VDD pin, a X5R capacitor of 1.0 F is recommended. For VBUS pin, because it also acts as the microphone input, the decoupling capacitance at VBUS pin must be carefully considered. Assuming the voice band is 3.4 kHz and the pull-up resistance for the microphone is 2.0 k, the decoupling capacitance at the VBUS pin should be less than 22 nF. A 4.
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TYPICAL APPLICATIONS PACKAGE DIMENSIONS PACKAGE DIMENSIONS For the most current package revision, visit www.freescale.com and perform a keyword search using the “98A” listed below.
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TYPICAL APPLICATIONS PACKAGE DIMENSIONS 34825 36 Analog Integrated Circuit Device Data Freescale Semiconductor
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TYPICAL APPLICATIONS PACKAGE DIMENSIONS 34825 Analog Integrated Circuit Device Data Freescale Semiconductor 37
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REVISION HISTORY REVISION HISTORY Revision Date 2.0 3/2010 3.0 6/2014 4.0 9/2014 Description of Changes • Initial Release • No technical changes. Revised back page. Updated document properties. Added SMARTMOS sentence to last paragraph.
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