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STMicroelectronics STLC2690WTR
- Part No.:
- STLC2690WTR
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 61-UFBGA, WLCSP
- Datasheet:
-
STLC2690WTR.pdf
- Description:
- IC RF TXRX+MCU BLE 61WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
STLC2690WTR from STMicroelectronics is a Bluetooth v3.0 + FM transceiver system-on-chip in WLCSP-61 package, integrating dual-mode RF transceivers, on-chip audio processing, A2DP SBC encoding/decoding, and RDS/RBDS demodulation. It operates from 1.65–1.95 V, supports fast clock inputs up to 52 MHz (including 13/16/19.2/26/32/38.4/52 MHz), and targets mobile handsets and portable media players requiring minimal external components (10 total) and <36 mm² PCB footprint.
For engineers reviewing the STLC2690WTR datasheet, STLC2690WTR pinout, STLC2690WTR application, or STLC2690WTR equivalent, key selection criteria include integrated FM TX+RX with digital baseband, Bluetooth HCI transport via UART/SPI, PCM/I2S audio interfaces, WLAN coexistence support, and on-chip auto-calibration of VCOs and filters - all within a single 0.4 mm pitch WLCSP.
Technical Context
The STLC2690WTR implements a shared-clock, shared-power SoC architecture where Bluetooth and FM subsystems operate concurrently or independently under unified reset and regulator control. Its digital baseband processes FM (de)multiplexing/(de)modulation in real time, while an embedded microcontroller handles RDS/RBDS symbol decoding, error correction, and host command routing via dedicated FM I²C or Bluetooth HCI.
Bluetooth functionality includes GFSK/π/4-DQPSK/8-DPSK modulation schemes, low-power modes (Sniff, Hold, Park), and host-offloaded SBC encoding. FM operation supports worldwide broadcast bands (76–108 MHz RX/TX), soft mute, mono/stereo blending, and SureTune™ frequency stabilization - all managed through configurable registers accessible over multiple digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bluetooth Version | v3.0 with EDR support for 1/2/3 Mbps data rates using GFSK, π/4-DQPSK, and 8-DPSK modulation |
| FM Band Coverage | 76–108 MHz RX and TX with worldwide band programmability and RDS/RBDS demodulation capability |
| Supply Voltage | 1.65 V to 1.95 V single supply - enables direct integration with modern mobile SoC I/O rails |
| Fast Clock Input | 13/16/16.8/19.2/26/32/33.6/38.4/52 MHz - supports flexible timing source options including crystal or sine/digital input |
| Slow Clock Input | 32.768 kHz - used for low-power timing and sleep mode synchronization |
| External Components | 10 total: 5 decoupling caps, 1 B-BPF (BT), 1 inductor + 3 caps (FM RX) - minimizes BOM and layout area |
| PCB Footprint | <36 mm² - achieved via WLCSP-61 (3.315 × 3.56 mm, 0.4 mm pitch) |
Pinout & Package
STLC2690WTR uses a Wafer-Level Chip Scale Package (WLCSP) with 61 solder bumps arranged in a 9×7 array (excluding missing bumps), 0.4 mm pitch, 0.6 mm height, RoHS-compliant and lead-free. Package marking includes "STLC2690" and date code per DocID022051 Rev 3 Figure 24.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD_IO | I/O Power Supply | 1.65–1.95 V supply for digital I/O banks (UART, SPI, I²C, PCM, JTAG) |
| VDD_CORE | Core Power Supply | Internal regulator input; powers Bluetooth/FM digital baseband and embedded MCU |
| CLK_IN | Fast Clock Input | Accepts 13–52 MHz digital or sine-wave clock; drives system timing and PLL reference |
| SLOW_CLK | Slow Clock Input | 32.768 kHz crystal or oscillator input for low-power timing and sleep state retention |
| BT_RF_IN/OUT | Bluetooth RF Port | Differential 2.4 GHz port supporting both transmit and receive paths with integrated balun interface |
| FM_RX_IN / FM_TX_OUT | FM RF Interface | Single-ended 76–108 MHz ports with internal antenna switch for shared RX/TX path |
| AUDIO_IN_L/R | FM Analog Audio Input | Differential line-in inputs for stereo FM recording or baseband audio injection |
| AUDIO_OUT_L/R | FM Analog Audio Output | Differential line-out with programmable gain and soft mute control for headphone/speaker drive |
| PCM_CLK / PCM_SYNC / PCM_IN / PCM_OUT | PCM Audio Interface | Four-wire synchronous interface supporting A-law/μ-law and linear PCM at 2048 kHz frame rate |
| SDA_FM / SCL_FM | FM I²C Control | Dedicated 2-wire interface for FM subsystem configuration independent of Bluetooth stack |
Key Features
| Feature | Design Value |
|---|---|
| Integrated FM Transmitter + Receiver | Enables full broadcast FM radio functionality (tune/listen/transmit) without external tuner IC or discrete RF front-end |
| A2DP SBC Encoding Offload | Embedded DSP performs SBC compression in hardware, reducing host CPU load and power during wireless audio streaming |
| On-Chip RDS/RBDS Processing | Dedicated firmware decodes, synchronizes, and corrects RDS/RBDS data - no host-side parsing required |
| WLAN/WiMAX Coexistence Interface | Hardware PTA (Packet Traffic Arbitration) signals coordinate RF resource sharing between Bluetooth and 2.4 GHz WLAN radios |
| Auto-Calibration Engine | Self-tunes VCO center frequency, analog filter bandwidths, and DC offsets during startup and temperature drift compensation |
Applications
| Smartphone FM Radio Integration | Wireless Headset with FM Broadcast |
|---|---|
Use Scenario: Adding FM receiver and transmitter capability to Android/iOS smartphones without increasing component count or board area. IC Role / Device Role / Timing Role: Single-chip FM transceiver handling RF tuning, demodulation, RDS decoding, and stereo audio I/O - synchronized to host PCM clock. Use Value: Reduces BOM by 8–10 discrete components versus dual-chip solution; enables FM broadcast sharing via Bluetooth A2DP. | Use Scenario: Enabling Bluetooth headsets to receive local FM stations and stream them wirelessly to connected devices. IC Role / Device Role / Timing Role: FM RX frontend + Bluetooth A2DP source - digitizes FM audio, encodes via SBC, and streams over HCI UART/SPI link. Use Value: Eliminates need for separate FM tuner and audio codec; leverages on-chip SBC offload for low-latency streaming. |
| Portable Media Player with FM TX | Automotive Infotainment Auxiliary Input |
Use Scenario: Allowing MP3 players to broadcast stored audio to car stereos via FM transmitter. IC Role / Device Role / Timing Role: FM TX baseband processor with SureTune™ frequency lock and programmable output power (−10 to +10 dBm). Use Value: Maintains stable transmission frequency across temperature/voltage variation; meets FCC/ETSI spectral mask requirements. | Use Scenario: Integrating FM radio into aftermarket automotive head units with Bluetooth hands-free and audio streaming. IC Role / Device Role / Timing Role: Dual-role transceiver managing concurrent BT call audio (PCM) and FM radio playback (I²S), with shared clock domain. Use Value: Enables seamless audio source switching without clock domain crossing artifacts or resampling delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Bluetooth + FM transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STLC2593V1R | Predecessor SoC; Bluetooth-only (no FM TX), no A2DP SBC offload, larger WLCSP-54 package | Lacks FM broadcast capability and RDS processing; requires external FM tuner for radio functions | Select only if FM TX is unnecessary and legacy compatibility with STLC2593 design is required |
| CSR8645 | Bluetooth audio SoC with integrated codec; no FM transceiver, no RDS, no WLAN coexistence interface | Focused on A2DP sink/source only; requires external FM silicon or software-defined radio for FM functions | Choose when Bluetooth audio performance and low-power voice calls are primary; FM is handled separately |
Compared with STLC2690WTR, STLC2593V1R omits FM TX and SBC offload - limiting use to Bluetooth-only designs - while CSR8645 provides superior Bluetooth audio features but zero FM capability, making it unsuitable for integrated broadcast radio applications.
Availability
STLC2690WTR is available at Aetrix Electronics and suitable for smartphone integration, portable media player development, wireless headset design, and automotive infotainment systems requiring stable component supply and long-term production continuity.
Supply support for STLC2690WTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, sensors, power management ICs, and wireless SoCs for industrial, automotive, and consumer markets.
The STLC2690 belongs to ST's Wireless Connectivity product line, engineered specifically for ultra-low-power, space-constrained mobile devices needing integrated Bluetooth and FM broadcast functionality - not just connectivity, but full radio subsystem consolidation.
FAQ
Does STLC2690WTR support Bluetooth Low Energy (BLE)?
No. The STLC2690WTR implements Bluetooth v3.0 + EDR (Enhanced Data Rate) only, with support for 1/2/3 Mbps GFSK, π/4-DQPSK, and 8-DPSK modulation. It does not include BLE (v4.0+) protocol stack, radio hardware, or advertising channel support. BLE functionality requires a separate IC or newer-generation SoC such as ST's BlueNRG series.
Can STLC2690WTR operate without an external crystal?
Yes - it accepts either a 32.768 kHz external crystal or a buffered clock signal on the SLOW_CLK pin, and supports multiple fast clock sources: 13–52 MHz crystal, sine wave, or digital clock on CLK_IN. Internal oscillators are not provided; all timing relies on externally supplied clocks per Section 2.6 of DocID022051 Rev 3.
What audio interfaces does STLC2690WTR provide for FM subsystem control?
The FM subsystem supports two dedicated audio interfaces: a 4-wire PCM interface (PCM_CLK, PCM_SYNC, PCM_IN, PCM_OUT) for digital audio transport, and a separate FM I²C bus (SDA_FM, SCL_FM) for register-level control and status reporting - enabling independent FM operation even when Bluetooth is inactive or reset.
Is the STLC2690WTR pin-compatible with STLC2593?
No. STLC2690WTR uses a WLCSP-61 package with different pin mapping, power domain partitioning (VDD_IO/VDD_CORE), and added interfaces (FM I²C, WLAN PTA, additional GPIOs). Pinout diagrams in Figures 3 and 15 of DocID022051 Rev 3 confirm non-interchangeability - board redesign is required for migration from STLC2593.
STLC2690WTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 61-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- Bluetooth, VHF
- Protocol:
- Bluetooth v3.0, FM Radio
- Modulation:
- 8DPSK, DQPSK, GFSK
- Frequency:
- 65.9MHz ~ 108MHz, 2.4GHz
- Data Rate (Max):
- 3Mbps
- Power - Output:
- 10dBm
- Sensitivity:
- -91dBm
- Memory Size:
- -
- Serial Interfaces:
- I2C, JTAG, SPI, UART
- GPIO:
- 22
- Voltage - Supply:
- 1.65V ~ 1.95V
- Current - Receiving:
- 15mA
- Current - Transmitting:
- 21mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 61-WLCSP (3.32x3.56)
STLC2690WTR FAQ
1.How can I place an order for STLC2690WTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STLC2690WTR 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 STLC2690WTR reliable?
The price and inventory of STLC2690WTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLC2690WTR is usually 5 days.
3.What payment methods are accepted for STLC2690WTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLC2690WTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STLC2690WTR?
STLC2690WTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STLC2690WTR 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 STLC2690WTR?
For technical support, including STLC2690WTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLC2690WTR requirements.
6.How does Aetrix verify that STLC2690WTR is sourced from the original manufacturer or authorized distributors?
All STLC2690WTR 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 STLC2690WTR meets industry standards.
7.What is the process for return or replacement of STLC2690WTR?
All STLC2690WTR units undergo pre-shipment inspection (PSI). If there is an issue with STLC2690WTR, 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 STLC2690WTR part is unused and in its original packaging.
Return procedure for STLC2690WTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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