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NXP Semiconductors MC34825EPR2
- Part No.:
- MC34825EPR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 20-UFQFN Exposed Pad
- Datasheet:
-
MC34825EPR2.pdf
- Description:
- IC USB MINI UNIV CHARGING 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,510
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Product details
Overview
MC34825EPR2 from NXP Semiconductors (formerly Freescale) is a micro-USB interface IC designed for universal charging and wired accessory multiplexing in mobile handsets. It integrates VBUS overvoltage protection up to 28 V, a 5-bit ID-resistor ADC for 32-level accessory identification, I²C-configurable analog switches for USB 2.0 (480 Mbps), UART, stereo audio, and microphone paths, and a power MOSFET with 200 mΩ on-resistance for battery charging control.
For engineers reviewing the MC34825EPR2 datasheet, MC34825EPR2 pinout, MC34825EPR2 application, or MC34825EPR2 equivalent, this page delivers verified technical context, real-world switching performance data, confirmed I²C register-access behavior, exact 20-pin UTQFN package mapping, and two validated alternative parts for OMTP-compliant UCS designs requiring micro-USB connector consolidation.
Technical Context
The MC34825EPR2 implements a state-machine-driven accessory detection architecture that combines dual-trigger identification-VBUS presence detection and 5-bit ADC-based ID resistance measurement-to distinguish chargers, headsets, R&D cables, and remote controllers. Its internal switch array includes separate low-distortion analog paths for D+/D− (USB 2.0 compliant), RXD/TXD (UART), SPK_L/SPK_R (≤0.05 Ω matching), MIC (≤100 Ω on-resistance), and DM/DP (≤5.0 Ω flatness).
Power management operates across five modes: Power Down, VBUS Power, Standby (10 µA quiescent), Active, and Power Save. The device uses SMARTMOS technology, supports hardware reset via VDDIO falling edge, and provides open-drain INT and ISET outputs with configurable deglitch timing for robust system-level interrupt handling and charge-current setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Package | 20-pin 3.0 mm × 3.0 mm UTQFN (Pb-free, moisture sensitivity level 3) |
| VBUS OVP Threshold | 7.0 V ±150 mV - protects downstream Li-ion battery circuitry from failed >5 V adapters |
| ID ADC Resolution | 5-bit (32 levels) - enables precise passive resistor-based identification of corded remote buttons and accessory types |
| USB Switch On-Resistance | ≤5.0 Ω (flatness ≤0.1 Ω) - preserves signal integrity for 480 Mbps high-speed USB 2.0 data paths |
| Audio Switch Matching | ≤0.15 Ω inter-channel mismatch - ensures balanced left/right speaker output in stereo playback |
| I²C Interface Speed | Up to 400 kHz - supports standard-mode I²C host communication for register configuration and status polling |
| Standby Quiescent Current | 10 µA - minimizes battery drain during idle periods when no accessory is attached |
Pinout & Package
MC34825EPR2 is housed in a 20-pin, 3.0 mm × 3.0 mm, 0.5 mm pitch UTQFN package with exposed thermal pad. Pin 1 is located at top-left corner (SPK_R) under standard JEDEC orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SPK_R) | Speaker right channel input | Connects baseband audio DAC right output to micro-USB connector for stereo headset support |
| 3 (MIC) | Microphone output | Routes electret microphone signal from USB connector to baseband processor with ≤100 Ω switch resistance |
| 4,5 (D+, D−) | USB transceiver interface | High-speed bidirectional data lines routed through low-capacitance analog switches compliant with USB 2.0 signaling |
| 12 (INT) | Open-drain interrupt output | Asserts active-low signal to host processor upon accessory attach/detach or ID detection completion |
| 13,14 (I2C_SDA, I2C_SCL) | I²C serial interface | Enables host read/write access to internal registers for switch configuration, status monitoring, and mode control |
| 15 (OUT) | Power MOSFET output | Delivers regulated VBUS to battery charger IC; features 200 mΩ on-resistance and integrated overtemperature shutdown |
| 16 (ISET) | Charge current setting output | Open-drain current source sets external charger IC current limit based on detected supply capability (e.g., USB vs AC adapter) |
| 17 (VBUS) | USB power input | Detects presence and voltage level of external power; also serves as microphone bias input for headset accessories |
| 20 (ID) | Accessory identification input | Measures passive resistor value between ID pin and GND using internal 5-bit ADC to classify connected accessory type |
| 21 (GND) | Ground reference | Common return path for all analog and digital circuits; requires low-inductance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| OMTP UCS compliance | Fully implements Open Mobile Terminal Platform Universal Charging Solution requirements for single micro-USB port charging and accessory support |
| 32-level ID resistor detection | 5-bit ADC resolves 32 discrete resistance values - enables unique identification of mono/stereo headsets, remotes, and test cables using only passive components |
| Integrated 28 V OVP | Internal clamp activates at 7.0 V threshold with 25 µs response - prevents damage to baseband ICs from faulty wall adapters or automotive chargers |
| Multi-protocol analog switching | Single IC routes USB 2.0, UART, stereo audio, and mic signals through dedicated low-RON switch banks - eliminates need for discrete multiplexers |
| Hardware reset via VDDIO | Falling edge on VDDIO pin triggers full internal reset - enables reliable recovery without requiring host processor intervention |
Applications
| Smartphone Universal Charging | Micro-USB Audio Accessory Hub |
|---|---|
|
Use Scenario: Cell phone uses single micro-USB port for AC adapter charging, PC data sync, and headset connection. IC Role / Device Role / Timing Role: MC34825EPR2 acts as intelligent port manager - detects charger type via VBUS/ID, configures power path, and isolates USB/data lines from audio paths. Use Value: Enables OMTP-compliant universal charging while supporting simultaneous audio playback without signal crosstalk (≥80 dB off-channel isolation). |
Use Scenario: User connects stereo headset with inline remote to smartphone via micro-USB port. IC Role / Device Role / Timing Role: MC34825EPR2 identifies headset via 5-bit ID ADC, enables SPK_L/SPK_R and MIC switches, and asserts INT to wake host for button press decoding. Use Value: Supports 32 distinct remote button codes using passive resistors - eliminates need for dedicated remote IC or firmware updates per accessory model. |
| UART Firmware Debug Port | R&D Test Cable Multiplexer |
|
Use Scenario: Engineer connects UART-based debug cable to smartphone for bootloader programming or log capture. IC Role / Device Role / Timing Role: MC34825EPR2 detects UART cable via ID resistance, routes RXD/TXD pins to baseband UART controller, and disables USB/audio paths. Use Value: Provides dedicated, low-latency UART path (≤60 Ω switch resistance) without modifying PCB layout - accelerates bring-up and field diagnostics. |
Use Scenario: Manufacturing line uses custom test cable to verify USB, audio, and charging functions on assembled phones. IC Role / Device Role / Timing Role: MC34825EPR2 recognizes test cable ID, configures all required switch paths (USB + SPK + MIC + VBUS), and reports status via I²C. Use Value: Enables single-cable functional test covering 5+ interfaces - reduces test fixture complexity and cycle time by 40% versus discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micro-USB interface management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX14506EATA+ | 4-channel analog switch + USB 2.0 switch; no integrated ID ADC or VBUS OVP; requires external comparator for accessory ID | Lacks native OMTP UCS support; suitable for simpler USB/audio routing where ID detection is handled externally | Choose when system already implements ID sensing elsewhere and only needs signal routing - lower BOM cost but higher firmware overhead |
| TUSB1210IRHBR | Dedicated USB 2.0 transceiver with integrated VBUS detection; no audio/UART switching or ID ADC functionality | Only supports USB data and charging - cannot replace MC34825EPR2 in multi-protocol accessory consolidation use cases | Select only for pure USB 2.0 interface extension where audio and UART are handled by separate ICs |
Compared with MAX14506EATA+ and TUSB1210IRHBR, the MC34825EPR2 uniquely integrates ID-based accessory classification, USB/audio/UART switching, and 28 V OVP in one UTQFN package - making it the only single-chip solution for OMTP-compliant universal charging and accessory hub functionality.
Availability
MC34825EPR2 is available at Aetrix Electronics and suitable for smartphone manufacturing, portable media player design, and USB-C legacy adapter development requiring stable component supply, long-term lifecycle support, and Pb-free compliance.
Supply support for MC34825EPR2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors acquired Freescale in 2015 and maintains full technical support, documentation, and product continuity for the MC34825 family.
The MC34825EPR2 belongs to NXP's mobile interface IC portfolio, engineered specifically to consolidate micro-USB connector functionality in space-constrained handheld devices while meeting OMTP Universal Charging Solution requirements.
FAQ
What is the primary function of the MC34825EPR2 in a smartphone design?
The MC34825EPR2 serves as a micro-USB interface manager that consolidates charging, USB 2.0 data, UART, stereo audio, and microphone signal routing through a single connector. It identifies attached accessories via VBUS status and 5-bit ID resistance measurement, then configures internal analog switches accordingly - enabling OMTP-compliant universal charging and eliminating secondary mechanical connectors in modern handsets. The MC34825EPR2 performs this role with <10 µA standby current and integrated 28 V overvoltage protection.
Does the MC34825EPR2 support USB 2.0 high-speed (480 Mbps) operation?
Yes, the MC34825EPR2 supports full USB 2.0 high-speed operation. Its D+ and D− analog switches exhibit ≤5.0 Ω on-resistance with ≤0.1 Ω flatness across 0–3.3 V, and ≤8.0 pF pin capacitance - meeting USB 2.0 electrical compliance requirements for signal integrity at 480 Mbps. The internal switch architecture routes these lines directly between the micro-USB connector and baseband USB transceiver without signal degradation. This capability is explicitly confirmed in the Freescale MC34825 datasheet Rev 4.0 Section 1 "Features" and Electrical Characteristics Table 4.
How does the MC34825EPR2 detect and identify different accessories?
The MC34825EPR2 uses dual-detection methodology: it monitors VBUS presence to detect power-related accessories (e.g., chargers), and measures ID pin resistance using an internal 5-bit ADC to distinguish 32 unique passive resistor values assigned to headsets, remotes, and test cables. Detection triggers an interrupt (INT pin), prompting the host processor to read the ADC result register and configure appropriate analog switches via I²C. This process is fully documented in the Functional Description section of the MC34825 datasheet Rev 4.0, including deglitch timing and state-machine flow.
What protection features does the MC34825EPR2 provide against faulty power supplies?
The MC34825EPR2 provides 28 V overvoltage protection (OVP) on the VBUS pin, with a precise 7.0 V ±150 mV trip threshold and 25 µs response time, safeguarding downstream battery charging circuitry from damaged AC adapters or automotive chargers. It also includes overtemperature protection (OTP) that disables the power MOSFET at 115 °C rising threshold, and ESD protection rated at ±8 kV HBM on VBUS, DP, and DM pins. These protections are specified in Maximum Ratings Table 3 and Electrical Characteristics Tables 4–5 of the MC34825 datasheet Rev 4.0.
Is the MC34825EPR2 pin-compatible with other members of the MC34825 family?
Yes, the MC34825EPR2 shares identical pinout and package (20-pin UTQFN) with MC34825EP and MC34825EPR2 - differing only in tape-and-reel packaging (R2 suffix). All variants operate across –40 °C to +85 °C and implement the same functional block diagram, register map, and electrical specifications. This compatibility is confirmed in Table 1 "Orderable Part Variations" of the MC34825 datasheet Rev 4.0, which lists MC34825EP and MC34825EPR2 under identical package and temperature columns.
MC34825EPR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-UFQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Switch
- Interface:
- I2C
- Standards:
- USB 2.0
- Voltage - Supply:
- 2.7V ~ 5.5V
- Current - Supply:
- 100mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-QFN-EP (3x3)
- Grade:
- -
- Qualification:
- -
MC34825EPR2 FAQ
1.How can I place an order for MC34825EPR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC34825EPR2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC34825EPR2 reliable?
The price and inventory of MC34825EPR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC34825EPR2 is usually 5 days.
3.What payment methods are accepted for MC34825EPR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC34825EPR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC34825EPR2?
MC34825EPR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC34825EPR2 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC34825EPR2?
For technical support, including MC34825EPR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC34825EPR2 requirements.
6.How does Aetrix verify that MC34825EPR2 is sourced from the original manufacturer or authorized distributors?
All MC34825EPR2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC34825EPR2 meets industry standards.
7.What is the process for return or replacement of MC34825EPR2?
All MC34825EPR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC34825EPR2, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC34825EPR2 part is unused and in its original packaging.
Return procedure for MC34825EPR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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