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Renesas P9235A-RBNDGI
- Part No.:
- P9235A-RBNDGI
- Manufacturer:
- Renesas
- Category:
- Power Management - Specialized
- Package:
- -
- Datasheet:
-
P9235A-RBNDGI.pdf
- Description:
- IC WIRELESS TRANSMITTER 40-VFQFP
- Quantity:
- Payment:
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Inventory:4,985
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Product details
Overview
P9235A-RBNDGI from Renesas Electronics is a highly integrated magnetic induction wireless power transmitter IC supporting up to 5W system output, featuring an embedded 32-bit ARM® Cortex®-M0 processor, integrated half-bridge gate drivers (GH_BRG1/GL_BRG1/GH_BRG2/GL_BRG2), and dual demodulation (VDEM/IDEM) for robust bi-directional data communication with WPC-compliant receivers like P9225-R. It operates across 4.25V–21V input and delivers regulated 5V (PREG), 3.3V (LDO33), and 1.8V (LDO18) internal supplies.
For engineers reviewing the P9235A-RBNDGI datasheet, P9235A-RBNDGI pinout, P9235A-RBNDGI application, or P9235A-RBNDGI equivalent, key selection considerations include its 40-VFQFPN package, SPI interface for external flash firmware updates, I²C-based telemetry (voltage/current/frequency/fault), and hardware-level foreign object detection (FOD) with thermal shutdown at 140°C.
Technical Context
The P9235A-RBNDGI implements a full-featured WPC-compliant transmitter architecture with two independent half-bridge driver stages, each with dedicated bootstrap (BST_BRG1/BST_BRG2), switch node (SW_BRG1/SW_BRG2), and gate outputs (GH/GL). Its dual demodulation path-voltage-based (VDEM) and current-based (IDEM)-enables reliable ASK decoding under varying coil coupling and load conditions.
It integrates a step-down switching regulator (SW_S, VIN_LDO, LDO33/LDO18/PREG), on-die ADC (12-bit, 10-channel), and five firmware-configurable GPIOs (GPIOA2–GPIOA6) for FOD limit tuning, buzzer control, or multi-coil driving. Communication is supported via I²C (SCL/SDA) for real-time monitoring and SPI (SS/SCLK/MOSI/MISO) for external flash firmware loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Power | 5W total system power with P9225-R receiver; enables compact wearable charging without external power stage redesign. |
| Input Voltage Range | 4.25V to 21V; supports single-cell Li-ion (4.2V) up to 19V adapter inputs without external pre-regulation. |
| Operating Temp | −40°C to +85°C ambient; validated for use in smartwatches and medical wearables exposed to body heat and environmental extremes. |
| Demodulation Scheme | Voltage (VDEM) + current (IDEM) envelope detection; ensures packet integrity during low-coupling or high-noise conditions in portable devices. |
| FOD Detection | Real-time power-loss delta monitoring vs. WPC threshold; triggers automatic shutdown to prevent metallic object heating above safe limits. |
| Protection Features | UVLO (4.0V rising), thermal shutdown (140°C), over-current, and ESD (±2kV HBM); eliminates need for discrete protection circuitry. |
| Regulated Outputs | PREG (5V), LDO33 (3.3V), LDO18 (1.8V); all internally buffered and unregulated for external loading-only for biasing internal blocks. |
Pinout & Package
Package: 40-pin VFQFPN, 5 mm × 5 mm, 0.5 mm pitch, exposed thermal pad (EP) connected to GND for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E¯N¯ | Active-low enable input | Shuts down device to <25 µA; required for system-level power sequencing and standby mode control. |
| VIN / DRV_VIN | Main power input / gate driver supply | VIN powers core logic and buck stage; DRV_VIN independently supplies gate drivers-decouples switching noise from logic rails. |
| SW_S / SW_BRG1 / SW_BRG2 | Switch nodes | SW_S drives buck inductor; SW_BRG1/SW_BRG2 drive external half-bridge FETs-each requires external bootstrap capacitor. |
| GH_BRG1/GL_BRG1/GH_BRG2/GL_BRG2 | High-/low-side gate drivers | Direct-drive outputs for external N-channel MOSFETs; rise/fall times 50–300 ns support efficient 100–205 kHz resonant operation. |
| VDEM / IDEM | Bi-directional data demodulation inputs | VDEM senses coil voltage modulation; IDEM senses coil current modulation-dual-path redundancy improves ASK packet reliability. |
| SCL / SDA / SS / SCLK / MOSI / MISO | I²C & SPI interfaces | I²C reads telemetry (V/I/fault); SPI loads firmware from external flash-enables field-upgradable coil configurations (e.g., A11a). |
| GPIOA2–GPIOA6 | Configurable digital I/O | Firmware-defined functions: FOD threshold adjustment, buzzer drive, auxiliary coil control, or status signaling-no external logic needed. |
| LED1 / LED2 | Open-drain status indicators | Predefined blinking patterns indicate power transfer active, fault, or handshake success-reduces firmware overhead for UI feedback. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded ARM® Cortex®-M0 | 32-bit programmable core enables custom FOD algorithms, dynamic frequency hopping, and proprietary protocol extensions without external MCU. |
| Dual ASK Demodulation | Simultaneous VDEM and IDEM processing increases packet decode success rate >99.5% across misalignment and variable Q-factor conditions. |
| Integrated Buck Regulator | SW_S-based 5V step-down stage eliminates need for external DC/DC converter-reduces BOM count and PCB area in space-constrained wearables. |
| Hardware FOD Engine | Real-time ΔP calculation between transmitted and received power using on-die ADC and ISNS_OUT differential current sense-meets WPC v1.2.4 compliance. |
| Thermal Protection | Junction shutdown at 140°C with 20°C hysteresis (120°C recovery); prevents thermal runaway during prolonged high-power operation or poor heatsinking. |
| External Flash Interface | SPI master interface allows firmware updates in-system-supports multiple coil topologies (A1/A11a) and regional regulatory adaptations post-deployment. |
Applications
| Smart Wearables | Wireless Earbuds |
|---|---|
Use Scenario: Charging compact smartwatches with tight mechanical envelopes and strict thermal budgets. IC Role / Device Role / Timing Role: Primary wireless power transmitter controlling resonant frequency, power level, and bidirectional handshake with P9225-R RX. Use Value: Integrated 5W capability and 5×5 mm VFQFPN package enable direct integration into watch cradles without external regulators or FET drivers. |
Use Scenario: Multi-device charging case powering left/right earbuds simultaneously. IC Role / Device Role / Timing Role: Dual-coil capable transmitter managing independent power delivery and status reporting per earbud via GPIOA2–A6 configuration. Use Value: Firmware-reconfigurable GPIOs eliminate need for discrete multiplexers or secondary controllers-reducing component count by ≥3. |
| Fitness Trackers | Portable Medical Sensors |
Use Scenario: Continuous-charging wristbands for heart rate and SpO₂ monitoring. IC Role / Device Role / Timing Role: Low-quiescent-current (1 mA standby) transmitter maintaining readiness while minimizing battery drain during idle periods. Use Value: Periodic ping mode extends host battery life >72 hours between charges-critical for clinical-grade wearables requiring uninterrupted operation. |
Use Scenario: Sterile, sealed glucose monitors or ECG patches requiring contactless recharging through plastic housings. IC Role / Device Role / Timing Role: WPC-compliant transmitter enforcing strict FOD thresholds and thermal limits to ensure patient safety during extended charging cycles. Use Value: Hardware-enforced 140°C thermal cutoff and ±3.5% current-sense accuracy meet ISO 13485 design control requirements for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless power transmitter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT P9221-RB | Same 5W WPC TX architecture but lacks embedded ARM Cortex-M0; relies on external host MCU for firmware logic and FOD computation. | Requires additional microcontroller and firmware development; less suitable for standalone or ultra-low-BOM designs. | Select P9235A-RBNDGI when full autonomy, field-upgradable firmware, and minimal external components are required. |
| STMicroelectronics STWLC38 | Integrated 5W TX with ARM Cortex-M0, but uses proprietary analog front-end instead of dual VDEM/IDEM demodulation; no SPI flash interface. | Limited to fixed coil configurations; firmware updates require reprogramming via SWD-not possible in sealed end products. | Choose P9235A-RBNDGI for WPC-certified flexibility, dual-path communication resilience, and in-field firmware adaptability. |
Compared with IDT P9221-RB and STWLC38, the P9235A-RBNDGI uniquely combines embedded programmability, hardware-accelerated FOD, and SPI-based external flash support-enabling one-time hardware deployment with post-launch feature updates and multi-standard compliance (A1/A11a).
Availability
P9235A-RBNDGI is available at Aetrix Electronics and suitable for smart wearables, wireless earbuds, fitness trackers, portable medical sensors, and compact IoT charging systems requiring stable component supply, long-term lifecycle assurance, and WPC-compliant 5W wireless power delivery.
Supply support for P9235A-RBNDGI 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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The P9235A-RBNDGI belongs to Renesas' Wireless Power Transmitter product line, designed specifically for compact, standards-compliant, and firmware-flexible 5W magnetic induction charging in space- and power-constrained portable electronics.
FAQ
What is the function of the E¯N¯ pin on the P9235A-RBNDGI?
The E¯N¯ pin is an active-low enable input that places the P9235A-RBNDGI into ultra-low-power shutdown mode (<25 µA) when driven HIGH. When pulled LOW, it enables normal operation including power transfer, telemetry, and communication. This pin supports system-level power sequencing and battery-saving sleep states in host devices-critical for extending runtime in wearables where the P9235A-RBNDGI may remain idle for extended periods.
Does the P9235A-RBNDGI require external memory, and why?
Yes, the P9235A-RBNDGI requires external SPI flash memory to store control firmware. Its pre-programmed bootloader loads firmware from this external device at startup, enabling field-upgradable coil configurations (e.g., WPC A11a), custom FOD algorithms, and regional regulatory adaptations. Without external flash, the P9235A-RBNDGI cannot execute application firmware-making it mandatory for functional operation, not optional.
How does the P9235A-RBNDGI implement foreign object detection (FOD)?
The P9235A-RBNDGI performs hardware-accelerated FOD by continuously calculating the difference between transmitted and received power using its on-die 12-bit ADC and differential current-sense output (ISNS_OUT). When this delta exceeds the WPC-defined threshold-indicating eddy current heating in metallic objects-the device triggers immediate shutdown. This real-time, analog-domain FOD engine operates independently of firmware, ensuring safety compliance without CPU intervention.
What are the key differences between VDEM and IDEM pins on the P9235A-RBNDGI?
VDEM is the voltage demodulation input that detects ASK-encoded data from coil voltage variations, while IDEM is the current demodulation input detecting the same data from coil current variations. The P9235A-RBNDGI processes both signals simultaneously to improve packet reception reliability under low-coupling, high-Q, or noisy conditions. This dual-path scheme ensures >99.5% decode success where single-input receivers fail-directly enhancing interoperability with diverse WPC receivers like P9225-R.
Can the GPIO pins on the P9235A-RBNDGI be used for analog sensing?
No, the GPIOA2–GPIOA6 pins on the P9235A-RBNDGI are strictly digital I/Os with configurable pull-up/down and open-drain modes-they lack ADC input capability. Analog sensing is handled exclusively by the dedicated 10-channel, 12-bit ADC with inputs tied to internal nodes (VIN, ISNS_OUT, etc.). Any external analog signal must be conditioned and routed to appropriate ADC-capable pins-not GPIOs-to be measured by the P9235A-RBNDGI.
P9235A-RBNDGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
P9235A-RBNDGI FAQ
1.How can I place an order for P9235A-RBNDGI through Aetrix?
Please submit a Request for Quotation (RFQ) for P9235A-RBNDGI 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 P9235A-RBNDGI reliable?
The price and inventory of P9235A-RBNDGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P9235A-RBNDGI is usually 5 days.
3.What payment methods are accepted for P9235A-RBNDGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P9235A-RBNDGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P9235A-RBNDGI?
P9235A-RBNDGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P9235A-RBNDGI 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 P9235A-RBNDGI?
For technical support, including P9235A-RBNDGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P9235A-RBNDGI requirements.
6.How does Aetrix verify that P9235A-RBNDGI is sourced from the original manufacturer or authorized distributors?
All P9235A-RBNDGI 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 P9235A-RBNDGI meets industry standards.
7.What is the process for return or replacement of P9235A-RBNDGI?
All P9235A-RBNDGI units undergo pre-shipment inspection (PSI). If there is an issue with P9235A-RBNDGI, 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 P9235A-RBNDGI part is unused and in its original packaging.
Return procedure for P9235A-RBNDGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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