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Texas Instruments TUSB2136PM
- Part No.:
- TUSB2136PM
- Manufacturer:
- Texas Instruments
- Category:
- Controllers
- Package:
- 64-LQFP
- Datasheet:
-
TUSB2136PM.pdf
- Description:
- IC USB HUB I/O CONTROL 64-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
TUSB2136PM from Texas Instruments is a USB 1.1-compliant two-port hub IC with integrated 8052 microcontroller, 8 kB RAM code space, and keyboard I/O controller functionality. It supports 1.5/12 Mbps data rates, individual port power management, and operates from a 12 MHz crystal with on-chip PLL generating 48 MHz. Used in compound USB keyboards requiring embedded hub + firmware-execution capability.
For engineers reviewing the TUSB2136PM datasheet, TUSB2136PM pinout, TUSB2136PM application, or TUSB2136PM equivalent, key selection criteria include its dual-role as USB hub controller and programmable MCU, suspend/resume support, I²C-based firmware loading, and GPIO-rich 64-pin TQFP package for keyboard matrix and LED control.
Technical Context
The TUSB2136PM integrates a full-speed USB 1.1 Serial Interface Engine (SIE) with hub logic and an 8052-compatible MCU core. Its memory architecture supports boot-from-EEPROM or host-downloaded firmware via USB, with SDW bit-controlled mapping between 6 kB ROM and 8 kB RAM code space.
It implements three interrupt/bulk endpoints (1 IN + 2 OUT), uses Schmitt-trigger GPIOs with 100 µA active pullups and open-drain outputs (8 mA sink), and provides dedicated port power control (PWRO1/PWRO2), overcurrent detection (OVCR1/OVCR2), and suspend signaling (SUSP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | Fully compliant with USB Specification Revision 1.1 - enables plug-and-play enumeration without custom driver development. |
| Data Rate | Supports 1.5 Mbps (low-speed) and 12 Mbps (full-speed) - compatible with standard USB keyboards and HID peripherals. |
| Microcontroller Core | 8052-based MCU with 256 B internal RAM, 512 B shared buffer/EDB RAM, and 8 kB external RAM code space - allows C-based firmware development using standard toolchains. |
| Crystal Frequency | 12 MHz input (X1/X2 pins) - generates internal 48 MHz clock via on-chip PLL; no external oscillator required. |
| Package | 64-pin TQFP (PM package) - surface-mount footprint with 0.5 mm pitch; supports automated assembly and thermal dissipation up to 70°C ambient. |
| Power Supply | 3.3 V ±0.3 V VCC; 1.8 V VDD18 required during suspend when VREN = HIGH - enables ultra-low-power operation with external 1.8 V rail. |
| GPIO Count | 32-bit general-purpose I/O across four ports (P0–P3), all with Schmitt-trigger inputs and configurable pullups - sufficient for full keyboard matrix scan (8×8) and LED drive. |
Pinout & Package
64-pin Plastic Quad Flatpack (PM) package with exposed thermal pad (not electrically connected). Pin spacing: 0.5 mm; body size: 10 mm × 10 mm; lead count: 64; RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DP0/DM0 | Upstream USB differential pair | Connects to host PC; requires 90 Ω differential impedance routing and ESD protection per USB 1.1 spec. |
| DP1/DM1, DP2/DM2 | Downstream USB differential pairs | Drive two independent USB devices; each includes dedicated PWROx and OVCRx for per-port power control and overcurrent detection. |
| P0[7:0]–P3[7:0] | General-purpose I/O ports | All pins support Schmitt-trigger input, 100 µA active pullup, and open-drain output (8 mA sink); configured via PUR_n registers. |
| PUR | Internal pullup resistor control | CMOS push-pull output (±8 mA); enables/disables internal 1.5 kΩ pullup on D+ for USB device enumeration timing control. |
| SCL/SDA | I²C master interface | Used for boot-time firmware load from external EEPROM; SCL is push-pull, SDA is open-drain with internal pullup. |
| VDD18 / VREN | Suspend-mode core power | VREN = LOW enables internal 3.3→1.8 V regulator; VREN = HIGH disables it - VDD18 must then supply 1.0–1.95 V at ≤10 µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated USB Hub + MCU | Eliminates need for separate hub IC and microcontroller - reduces BOM count, PCB area, and firmware integration effort in compound keyboards. |
| Firmware Loading Options | Supports both I²C EEPROM boot and host-USB download - enables field firmware updates and eliminates pre-programmed memory requirements. |
| Per-Port Power Management | Dedicated PWRO1/PWRO2 outputs and OVCR1/OVCR2 inputs allow independent enable/disable and overcurrent monitoring per downstream port. |
| USB Suspend/Resume Support | Hardware-assisted suspend signaling (SUSP pin) and wake-up capability - meets USB 1.1 power management requirements for low-power idle states. |
| Keyboard-Specific GPIO Mapping | GPIO assignment table (Table 4−1) defines P0/P1 for matrix scan rows/columns and P2/P3 for LED drivers - accelerates keyboard firmware development. |
Applications
| Compound USB Keyboard | USB Peripheral Hub |
|---|---|
|
Use Scenario: Mechanical keyboard with integrated USB hub for connecting mouse, headset, or flash drive. IC Role / Device Role / Timing Role: Acts as USB device (keyboard HID) and USB hub controller simultaneously; manages upstream enumeration and downstream port arbitration. Use Value: Reduces system-level component count by combining keyboard controller and hub functions in single TQFP package with shared firmware execution. |
Use Scenario: Low-cost, self-powered USB hub for industrial HMI panels with limited board space. IC Role / Device Role / Timing Role: Full-speed USB 1.1 hub controller with independent port power switching and overcurrent detection. Use Value: Enables robust port-level fault isolation and power sequencing without external MOSFETs or supervisor ICs. |
| Embedded HID Device | USB-to-Parallel Bridge |
|
Use Scenario: Programmable industrial control panel with custom HID report descriptors and LED feedback. IC Role / Device Role / Timing Role: Configurable 8052 MCU executing custom HID firmware; uses USB endpoints for report I/O and GPIO for button/LED interfacing. Use Value: Leverages 8 kB RAM code space and I²C boot to support field-upgradable HID behavior without mask-ROM customization. |
Use Scenario: Legacy parallel printer adapter with USB upstream connection and bidirectional data transfer. IC Role / Device Role / Timing Role: USB device endpoint handler translating USB bulk transfers to parallel port timing signals via GPIO bit-banging. Use Value: Uses P0–P3 GPIOs and built-in USB buffers to implement precise strobe/acknowledge timing without external logic or FPGA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB hub controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMSC USB2422 | USB 2.0 high-speed hub (480 Mbps); no integrated MCU; requires external microcontroller for HID functions. | Higher bandwidth but lacks on-chip firmware execution - suitable only when separate MCU handles keyboard logic. | Select if USB 2.0 speed and multi-port expansion (>2 ports) are required; not drop-in for TUSB2136PM's MCU-integrated use cases. |
| Cypress CY7C65632 | USB 2.0 hub with integrated 8051 MCU; 16 kB flash; supports USB suspend/resume but no native keyboard I/O GPIO mapping. | Greater code storage and USB speed, but lacks dedicated keyboard matrix/LED register tables and VID/PID selection inputs (S2/S3). | Choose for new designs needing USB 2.0 and larger firmware; requires redesign of GPIO initialization and HID descriptor handling. |
Compared with SMSC USB2422 and Cypress CY7C65632, the TUSB2136PM uniquely combines USB 1.1 hub functionality, 8052 MCU execution, and keyboard-specific hardware features (matrix scan GPIO mapping, S2/S3 VID/PID selection) in a single 64-pin TQFP - making it optimal for cost-sensitive, space-constrained compound keyboard designs.
Availability
TUSB2136PM is available at Aetrix Electronics and suitable for compound USB keyboard design, embedded HID peripheral development, and industrial USB hub integration requiring stable component supply and long-term manufacturability.
Supply support for TUSB2136PM 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in USB interface solutions and microcontroller platforms.
The TUSB2136PM belongs to TI's USB connectivity product line, designed specifically for cost-optimized, integrated USB device + hub applications in human interface devices and embedded peripherals.
FAQ
What is the primary function of the TUSB2136PM in a USB keyboard design?
The TUSB2136PM serves as both a USB 1.1 two-port hub controller and an 8052-based microcontroller with 8 kB RAM code space. In a compound USB keyboard, it handles upstream HID enumeration, downstream port management, keyboard matrix scanning, LED control, and custom firmware execution - eliminating the need for separate hub and MCU ICs. This integration reduces BOM cost and PCB complexity while enabling field-upgradable behavior via I²C or USB.
Does the TUSB2136PM support USB 2.0 high-speed operation?
No, the TUSB2136PM is compliant only with USB Specification Revision 1.1 and supports low-speed (1.5 Mbps) and full-speed (12 Mbps) operation. It does not implement USB 2.0 high-speed (480 Mbps) signaling or associated PHY layers. Designs requiring high-speed bandwidth must select alternative hub controllers such as the SMSC USB2422 or Cypress CY7C65632, which are not pin- or firmware-compatible with the TUSB2136PM.
How is firmware loaded onto the TUSB2136PM at power-on?
Firmware loading for the TUSB2136PM occurs automatically at reset via two supported methods: (1) I²C EEPROM boot - the device reads firmware from an external EEPROM connected to SCL/SDA pins; or (2) USB host download - the host PC sends firmware over the upstream USB connection after enumeration. The boot mode is determined by the SDW bit and CONT bit in USBCTL register, with no external programming hardware required for either method.
What are the power requirements for TUSB2136PM during USB suspend mode?
During USB suspend, the TUSB2136PM disables its internal 3.3 V → 1.8 V regulator when VREN is driven HIGH. In this state, the VDD18 pin becomes an input requiring an external 1.0–1.95 V supply delivering ≤10 µA. If VREN remains LOW, the internal regulator stays active and supplies core power from VCC. This dual-mode design enables ultra-low-power suspend operation while maintaining flexibility for simpler power architectures.
Can the TUSB2136PM be used without external EEPROM?
Yes, the TUSB2136PM supports USB-based firmware download directly from the host PC, eliminating the need for external EEPROM. During boot, if no valid signature is detected on the I²C bus, the device enters USB download mode and waits for host-initiated firmware transfer. This enables rapid prototyping, field updates, and production variants without EEPROM programming steps - though I²C EEPROM remains optional for autonomous boot in final products.
TUSB2136PM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 64-LQFP
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Hub Controller
- Interface:
- USB
- Standards:
- USB 2.0
- Voltage - Supply:
- 3V ~ 3.6V
- Current - Supply:
- 25mA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 64-LQFP (10x10)
- Grade:
- -
- Qualification:
- -
TUSB2136PM FAQ
1.How can I place an order for TUSB2136PM through Aetrix?
Please submit a Request for Quotation (RFQ) for TUSB2136PM 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 TUSB2136PM reliable?
The price and inventory of TUSB2136PM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TUSB2136PM is usually 5 days.
3.What payment methods are accepted for TUSB2136PM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TUSB2136PM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TUSB2136PM?
TUSB2136PM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TUSB2136PM 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 TUSB2136PM?
For technical support, including TUSB2136PM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TUSB2136PM requirements.
6.How does Aetrix verify that TUSB2136PM is sourced from the original manufacturer or authorized distributors?
All TUSB2136PM 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 TUSB2136PM meets industry standards.
7.What is the process for return or replacement of TUSB2136PM?
All TUSB2136PM units undergo pre-shipment inspection (PSI). If there is an issue with TUSB2136PM, 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 TUSB2136PM part is unused and in its original packaging.
Return procedure for TUSB2136PM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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