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NXP Semiconductors MC33696FJE
- Part No.:
- MC33696FJE
- Manufacturer:
- NXP Semiconductors
- Category:
- RF Transceiver ICs
- Package:
- 32-LQFP
- Datasheet:
-
MC33696FJE.pdf
- Description:
- IC RF TXRX ISM<1GHZ 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:921
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Product details
Overview
MC33696FJE from Freescale Semiconductor is a highly integrated UHF transceiver for low-voltage ISM-band data transfer, supporting OOK/FSK modulation across 304–915 MHz bands, delivering –106.5 dBm RX sensitivity, up to 7.25 dBm TX output power, and programmable configuration switching between two register banks-enabling remote keyless entry (RKE) systems with ultra-low-power strobe wakeup.
For engineers reviewing the MC33696FJE datasheet, MC33696FJE pinout, MC33696FJE application, or MC33696FJE equivalent, this page delivers verified technical context, SPI-controlled PLL architecture, QFN32 package mapping, real-world RF link design parameters, and validated alternative transceivers for automotive and industrial wireless sensor nodes.
Technical Context
The MC33696FJE implements a superheterodyne receiver with high-side injection I/Q mixer, integrated polyphase image-reject filter, and 380 kHz IF bandwidth tuned via crystal-referenced AFC. Its fractional-N PLL achieves sub-30 µs frequency toggle time for hopping and FSK generation.
Transmit functionality uses a single-ended PA with programmable output power steps and out-of-lock detection to suppress spurious emissions. The embedded data manager supports Manchester decoding with clock recovery, ID/header recognition, and EOM detection-operating as SPI master in DME=1 mode or raw-data slave in DME=0 mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency Bands | 304, 315, 426, 434, 868, and 915 MHz ISM bands-supports global RKE and TPMS deployments without hardware change. |
| RX Sensitivity | –106.5 dBm at 20 kbps (OOK), –108 dBm at 2.4 kbps (FSK)-enables reliable reception in noisy automotive environments. |
| TX Output Power | Up to +7.25 dBm with 4-step programmable attenuation-balances range and regulatory compliance (e.g., ETSI EN 300 220). |
| Data Rate | 20 kbps max with Manchester coding-matches legacy RKE frame timing and MCU processing latency budgets. |
| Supply Voltage Range | 2.1–3.6 V or 5 V on VCCIN-supports direct connection to 3 V battery or 5 V system rail with internal LDO regulation. |
| Strobe Current (RX) | <1 mA at 1:10 duty cycle-extends coin-cell battery life to >5 years in periodic-scan RKE fobs. |
| PLL Frequency Step | 6 kHz resolution-enables precise channel spacing and fine-tuning for interference mitigation. |
Pinout & Package
MC33696FJE is housed in a 5 mm × 5 mm, 0.5 mm pitch QFN32 package with exposed thermal pad (EP). Pin functions are validated per Freescale MC33696 Rev. 12 datasheet, Table 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFIN | RF input | Connects to antenna or external LNA; requires 50 Ω matching network for optimal –106.5 dBm sensitivity. |
| RFOUT | RF output | Drives external PA or antenna directly; limited to ≤3.6 V bias-requires external RF switch control via SWITCH pin. |
| STROBE | Wakeup control | Accepts external capacitor for autonomous low-power periodic RX wake-up; disables standby when high. |
| CONFB | Configuration mode select | Pull-low forces SPI slave configuration mode regardless of current state-critical for field firmware updates. |
| MOSI/MISO/SCLK/SEB | SPI interface | Full-duplex 4-wire SPI (CPOL=0, CPHA=1); SEB enables multi-device bus sharing without disrupting RF state. |
| RSSIOUT / RSSIC | Analog RSSI I/O | RSSIOUT provides 0–1.2 V analog signal proportional to received signal strength; RSSIC selects digital or analog RSSI mode. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable dual-register bank switching | Enables seamless A/B configuration swap (e.g., 315 MHz RKE + 868 MHz TPMS) without MCU intervention or packet loss. |
| Embedded Manchester data manager | Offloads clock recovery, ID/header matching, and EOM detection from MCU-reducing firmware complexity and interrupt load. |
| Strobe oscillator with <1 mA RX current | Allows configurable wake intervals (e.g., 100 ms ON / 1 s OFF) to achieve sub-µA average current in sensor beacon applications. |
| Image-reject I/Q mixer + polyphase filter | Eliminates need for external SAW/IF filters-reduces BOM count and PCB area in cost-sensitive RKE modules. |
| Out-of-lock transmission inhibition | Prevents spurious emissions during PLL unlock events-ensures compliance with FCC Part 15.247 and ETSI EN 300 220. |
Applications
| Remote Keyless Entry (RKE) | Tire Pressure Monitoring System (TPMS) |
|---|---|
Use Scenario: Bidirectional communication between vehicle ECU and key fob for door lock/unlock, panic, and trunk release. IC Role / Device Role / Timing Role: UHF transceiver handling 315/434 MHz OOK/FSK physical layer, with strobe-driven low-duty-cycle RX to extend CR2032 battery life. Use Value: Dual-register bank switching allows simultaneous support for legacy 315 MHz fobs and newer 434 MHz variants on same PCB layout. | Use Scenario: Wireless transmission of tire temperature, pressure, and acceleration data from rotating wheel sensors to vehicle receiver. IC Role / Device Role / Timing Role: Low-power UHF transceiver operating at 315/434 MHz with fast PLL lock (<30 µs) to capture short-duration sensor bursts during wheel rotation. Use Value: Integrated data manager decodes Manchester frames and detects EOM-eliminating need for external logic or high-speed MCU sampling. |
| Industrial Sensor Beacon | Asset Tracking Tag |
Use Scenario: Battery-powered environmental sensor node reporting temperature/humidity every 5 minutes via 868 MHz ISM band. IC Role / Device Role / Timing Role: Transceiver in strobe-wakeup RX mode with programmable ROFF/RON counters-achieving <1 µA average current over 5-minute cycle. Use Value: On-chip 1.5 V digital regulator (VCCDIG2) maintains register state in standby, enabling instant resume without reconfiguration. | Use Scenario: GPS-denied indoor asset tag transmitting location ID and motion status via 915 MHz FSK to fixed gateways. IC Role / Device Role / Timing Role: FSK-capable transceiver with –108 dBm sensitivity at 2.4 kbps-maximizing link budget in multipath warehouse environments. Use Value: RSSIOUT analog output enables gateway-based signal triangulation without additional ADC resources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Si4362-B1B-FMR | Higher integration: includes crystal oscillator, DC-DC converter, and AES encryption; 125 kHz–1 GHz tuning range; 10 nA shutdown current. | Supports secure firmware updates and longer-range (>1 km) links; requires different SPI timing and register map. | Preferred for new designs requiring security or extended range; not drop-in due to different pinout and power architecture. |
| AX5043-DQ48-T | Lower RX sensitivity (–113 dBm @ 2.4 kbps), integrated PA (13 dBm), no strobe oscillator; uses proprietary SPI-like interface. | Better suited for high-output-power beacons; lacks autonomous wakeup-requires external timer MCU control. | Valid for cost-sensitive, high-volume beacons where sensitivity >–110 dBm is unnecessary and external wake control is acceptable. |
Compared with Si4362-B1B-FMR and AX5043-DQ48-T, the MC33696FJE offers superior strobe autonomy and dual-bank configuration switching-making it uniquely suitable for multi-band, ultra-low-power RKE and TPMS where MCU offload and battery longevity are critical.
Availability
MC33696FJE is available at Aetrix Electronics and suitable for remote keyless entry (RKE), tire pressure monitoring systems (TPMS), and industrial wireless sensor networks requiring stable component supply, long-lifecycle support, and automotive-grade reliability.
Supply support for MC33696FJE 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
Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in automotive, industrial, and networking ICs with emphasis on mixed-signal RF and power management.
The MC33696FJE belongs to Freescale's legacy UHF transceiver product line designed specifically for battery-operated automotive remote controls and sensor telemetry-prioritizing low quiescent current, robust ISM-band performance, and minimal external component count.
FAQ
What is the maximum data rate supported by the MC33696FJE?
The MC33696FJE supports a maximum data rate of 20 kbps using Manchester coding. This limit is defined by the internal IF filter bandwidth (380 kHz) and data slicer response. At lower rates such as 2.4 kbps, the MC33696FJE achieves improved sensitivity of –108 dBm-making it suitable for long-range TPMS applications where link budget is constrained.
Does the MC33696FJE require an external crystal oscillator?
Yes, the MC33696FJE requires an external crystal connected between XTALIN and XTALOUT pins. Crystal frequency depends on target ISM band (e.g., 16.967 MHz for 304 MHz operation, 24.191 MHz for 433.92 MHz). The crystal drives both the PLL and IF filter center frequency-ensuring stability over temperature and voltage per Freescale MC33696 Rev. 12 specifications.
How does the strobe oscillator function reduce power consumption in the MC33696FJE?
The strobe oscillator in the MC33696FJE enables periodic RX activation with user-defined ON/OFF intervals via ROFF/RON registers. When enabled (SOE=1), it draws only 24 µA in off-state and <1 mA during active RX at 1:10 duty cycle-reducing average current to ~100 µA. This extends CR2032 battery life beyond 5 years in RKE fobs, as confirmed in the MC33696FJE datasheet Section 12.1.2.
Can the MC33696FJE operate from a 5 V supply?
Yes, the MC33696FJE supports 5 V operation on VCCIN, but with constraints: VCCINOUT and VCCDIG must not be tied to VCCIN in 5 V mode (per Figure 45/46). The internal LDO generates regulated 2.1–2.7 V for RF/analog blocks (VCC2OUT) and 1.5 V for digital logic (VCCDIG2). RFOUT voltage remains capped at ≤3.6 V-requiring external biasing if driving a 5 V PA stage.
What is the purpose of the CONFB pin on the MC33696FJE?
The CONFB pin on the MC33696FJE forces entry into configuration mode when pulled low, overriding all other states-including transmit, receive, or standby. In this mode, the MC33696FJE acts as an SPI slave, accepting register writes/reads via MOSI/MISO/SCLK. This enables safe in-system programming and field firmware updates without requiring full device reset or power cycle.
MC33696FJE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 32-LQFP
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- -
- Modulation:
- FSK, OOK
- Frequency:
- 290MHz ~ 340MHz, 424MHz ~ 510MHz, 862MHz ~ 1.02GHz
- Data Rate (Max):
- 22.6kbps
- Power - Output:
- 7.25dBm
- Sensitivity:
- -106.5dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI
- GPIO:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Current - Receiving:
- 10.3mA ~ 24mA
- Current - Transmitting:
- 6.1mA ~ 13.5mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-LQFP (5x5)
MC33696FJE FAQ
1.How can I place an order for MC33696FJE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33696FJE 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 MC33696FJE reliable?
The price and inventory of MC33696FJE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33696FJE is usually 5 days.
3.What payment methods are accepted for MC33696FJE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33696FJE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33696FJE?
MC33696FJE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33696FJE 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 MC33696FJE?
For technical support, including MC33696FJE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33696FJE requirements.
6.How does Aetrix verify that MC33696FJE is sourced from the original manufacturer or authorized distributors?
All MC33696FJE 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 MC33696FJE meets industry standards.
7.What is the process for return or replacement of MC33696FJE?
All MC33696FJE units undergo pre-shipment inspection (PSI). If there is an issue with MC33696FJE, 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 MC33696FJE part is unused and in its original packaging.
Return procedure for MC33696FJE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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