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Diodes Incorporated PI7C9X1172BZHE
- Part No.:
- PI7C9X1172BZHE
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
PI7C9X1172BZHE.pdf
- Description:
- IC BRIDGE CTRLR I2C/SPI 32-TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,877
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Product details
Overview
PI7C9X1172BZHE from Diodes Incorporated is a dual-channel, full-duplex UART bridge controller supporting I²C-bus or SPI host interface, 64-byte TX/RX FIFOs per channel, programmable baud rates up to 16 Mbit/s (4× sampling), and RS-485/RS-232/IrDA protocol bridging in industrial embedded systems.
For engineers reviewing the PI7C9X1172BZHE datasheet, PI7C9X1172BZHE pinout, PI7C9X1172BZHE application, or PI7C9X1172BZHE equivalent, key selection criteria include dual UART channel independence, hardware/software flow control implementation, GPIO configurability, RS-485 auto-direction control, and compatibility with legacy 16C450 register sets.
Technical Context
The PI7C9X1172BZHE implements two independent UART channels with fully programmable character formatting (5–8 bit, parity, stop bits), fractional baud rate generation, and separate FIFO trigger level control via FCR and TLR registers. Each channel supports simultaneous hardware (RTS/CTS) and software (Xon/Xoff) flow control with configurable halt/resume thresholds.
It integrates dual interface select logic: I²C-bus slave mode only (fast-mode, 400 kHz) or SPI slave mode (Mode 0, up to 33 Mbps), with pin-strapped configuration (I2C/SPI#), address selection (A0/A1), and dedicated EN485#/ENIR# pins enabling automatic RS-485 half-duplex direction control and IrDA SIR mode (115.2 kbps or optional 1.152 Mbps).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Dual UART Channels | Fully independent, full-duplex operation with separate 64-byte TX/RX FIFOs and register sets per channel. |
| Host Interface | I²C-bus slave (fast-mode, 400 kHz) or SPI slave (Mode 0, ≤33 Mbps); selected by I2C/SPI# pin at power-up. |
| Baud Rate Range | Up to 16 Mbit/s using 4× oversampling clock; fractional divisor supports precise timing for non-standard rates. |
| GPIO Pins | Eight user-programmable I/O pins (GPIO[7:0]), configurable as UART modem signals (DSR/DTR/RI/CD) or general-purpose I/O. |
| RS-485 Support | Hardware-enforced auto-direction control via RTS# output, enabled by low-level EN485# pin; eliminates external transceiver control logic. |
| Operating Voltage | 1.8 V, 2.5 V, or 3.3 V supply; internal LDO enables single-rail operation across voltage grades without level shifters. |
| Temperature Range | −40 °C to +85 °C industrial grade; validated for factory automation and mobile computing environments. |
Pinout & Package
PI7C9X1172BZHE is available in 32-pin QFN (5 mm × 5 mm, 0.5 mm pitch) and 28-pin TSSOP packages. The BZHE suffix denotes the 32-pin QFN variant with exposed thermal pad (soldered to PCB ground plane for thermal management).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| SO / SDA | SPI data out / I²C data I/O | Time-multiplexed function: SO active only in SPI mode; SDA open-drain I²C bus line requiring external pull-up. |
| TXA / TXB | UART channel A/B transmit output | CMOS-level outputs; support standard UART idle-high or IrDA idle-low polarity based on ENIR# state. |
| RXA / RXB | UART channel A/B receive input | Input threshold adapts to UART (VIL < 0.8 V) or IrDA (VIH > 2.0 V) modes; unused pins require pull-up to VDD. |
| RTSA# / RTSB# | Channel A/B request-to-send output | Active-low outputs used for Auto-RTS flow control or RS-485 driver enable; polarity inverted when EN485# = LOW. |
| CTSA# / CTSB# | Channel A/B clear-to-send input | Active-low inputs enabling Auto-CTS; must be asserted before transmission begins; unused pins tied to VDD. |
| EN485# | RS-485 auto-direction enable | Low-level active input sampled at power-up; configures RTS# as RS-485 DE/RE signal instead of flow control. |
| IRQ# | Interrupt request output | Open-drain, active-low interrupt signal indicating FIFO status, error, or modem event; requires external pull-up resistor. |
| RESET# | Asynchronous reset input | Active-low pulse ≥40 ns resets all registers and disables UART outputs; does not affect I²C/SPI interface state. |
Key Features
| Feature | Design Value |
|---|---|
| 16C450 Register Compatibility | Full backward compatibility enables drop-in replacement in legacy firmware without driver modification. |
| Programmable FIFO Trigger Levels | Independent RX/TX trigger thresholds (1–64 bytes) reduce CPU interrupt load and prevent buffer overflow in bursty traffic. |
| Auto RS-485 Half-Duplex Control | Eliminates external direction-control logic by synchronizing RTS# assertion with TX start and deassertion with TX completion. |
| IrDA SIR Mode Support | Integrated encoder/decoder enables 115.2 kbps infrared communication without external PHY components. |
| Software Reset Capability | UART core reset via register write allows runtime recovery without toggling external RESET# pin or disrupting host interface. |
Applications
| Industrial Automation | Factory Process Control |
|---|---|
Use Scenario: Connecting PLCs and HMI panels over RS-485 daisy-chain networks in harsh EMI environments. IC Role / Device Role / Timing Role: Dual UART bridge translating SPI commands from ARM-based controller into isolated RS-485 serial streams with auto-direction control. Use Value: Eliminates discrete level shifters and direction logic; 64-byte FIFOs absorb jitter from mechanical sensor polling cycles. | Use Scenario: Integrating legacy Modbus RTU field devices (temperature sensors, valve actuators) into modern Ethernet gateways. IC Role / Device Role / Timing Role: Protocol converter between I²C host MCU and multiple RS-485 Modbus slaves, managing timing-critical response windows. Use Value: Hardware flow control prevents overrun during high-speed polling; 16C450 register mapping simplifies driver porting. |
| Mobile Computing | Battery-Powered Embedded Systems |
Use Scenario: Adding serial debug and peripheral connectivity (GPS, barcode scanner) to compact tablets and handheld terminals. IC Role / Device Role / Timing Role: Dual UART interface bridging low-power application processor's I²C bus to multiple asynchronous peripherals. Use Value: Low standby current (<10 µA at 3.3 V) extends battery life; IrDA SIR mode enables contactless firmware updates. | Use Scenario: Enabling remote diagnostics and firmware updates in sealed IoT edge nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-voltage UART bridge (1.8 V operation) interfacing microcontroller to RS-232 debug port and RS-485 sensor bus. Use Value: Single-supply operation avoids voltage translation; GPIO pins repurposed as wake-up inputs or status indicators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS752IPW | Single I²C interface only; no SPI mode; 64-byte FIFOs; identical 16C450 register map. | Lacks RS-485 auto-direction and IrDA support; GPIO count reduced to 8 (same count but fewer modem functions). | Select when I²C-only host interface suffices and RS-485 direction control is handled externally. |
| MAX3107EEG+ | Supports SPI only (no I²C); higher max SPI speed (26 MHz); integrated crystal oscillator driver. | No RS-485 auto-direction; no IrDA; GPIO limited to 4 pins; requires external crystal for timing. | Select when SPI host dominates and crystal integration reduces BOM count, but RS-485 features are unnecessary. |
Compared with SC16IS752IPW and MAX3107EEG+, PI7C9X1172BZHE uniquely combines dual-interface flexibility (I²C/SPI), RS-485 auto-direction, and IrDA SIR in one device-enabling consolidated design for mixed-protocol industrial gateways without sacrificing legacy register compatibility.
Availability
PI7C9X1172BZHE is available at Aetrix Electronics and suitable for industrial automation, factory process control, and battery-powered embedded systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for PI7C9X1172BZHE 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, energy-efficient solutions for industrial, computing, and consumer markets.
The PI7C9X1172 belongs to Diodes' high-integration UART bridge product line, designed specifically to replace legacy 16Cxxx UARTs while adding modern interface flexibility, protocol offload, and system-level integration for space-constrained embedded platforms.
FAQ
What host interfaces does PI7C9X1172BZHE support, and how is the interface selected?
The PI7C9X1172BZHE supports I²C-bus (fast-mode, 400 kHz) and SPI (Mode 0, up to 33 Mbps) host interfaces. Selection is determined at power-up by the logic level on the I2C/SPI# pin: HIGH enables I²C mode, LOW enables SPI mode. Addressing in I²C mode uses A0/A1 pins; in SPI mode, A0/CS# serves as chip select and A1/S1 as data input.
How does RS-485 auto-direction control work on PI7C9X1172BZHE?
RS-485 auto-direction is enabled by pulling the EN485# pin LOW at power-up. This reconfigures the RTS# output as an RS-485 driver enable signal: it asserts before TX starts and deasserts after TX completes. No external logic or timing circuitry is needed-the behavior is fully hardware-synchronized to UART transmission events.
Can PI7C9X1172BZHE operate from a 1.8 V supply, and what impact does voltage have on performance?
Yes, PI7C9X1172BZHE operates across 1.8 V, 2.5 V, and 3.3 V supplies. All I/Os are 3.3 V tolerant regardless of VDD, and internal regulators maintain consistent timing and drive strength. Baud rate accuracy and FIFO functionality remain unchanged; only standby current scales with voltage (e.g., ~5 µA at 1.8 V vs. ~10 µA at 3.3 V).
Is the PI7C9X1172BZHE pin-compatible with other Diodes UART bridges like the PI7C9X1170?
No-PI7C9X1172BZHE is not pin-compatible with PI7C9X1170. The PI7C9X1170 uses a 24-pin QFN package with different pin assignments, fewer GPIOs (4 vs. 8), no IrDA support, and no EN485#/ENIR# control pins. Migration requires PCB layout revision and firmware register mapping verification due to differing pin counts and peripheral enable logic.
PI7C9X1172BZHE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 32-VFQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- I2C
- Function:
- Bridge, I2C/SPI to UART
- Interface:
- UART
- Standards:
- -
- Voltage - Supply:
- 1.8V, 2.5V, 3.3V
- Current - Supply:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 32-TQFN (5x5)
- Grade:
- -
- Qualification:
- -
PI7C9X1172BZHE FAQ
1.How can I place an order for PI7C9X1172BZHE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X1172BZHE 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 PI7C9X1172BZHE reliable?
The price and inventory of PI7C9X1172BZHE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X1172BZHE is usually 5 days.
3.What payment methods are accepted for PI7C9X1172BZHE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X1172BZHE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X1172BZHE?
PI7C9X1172BZHE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X1172BZHE 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 PI7C9X1172BZHE?
For technical support, including PI7C9X1172BZHE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X1172BZHE requirements.
6.How does Aetrix verify that PI7C9X1172BZHE is sourced from the original manufacturer or authorized distributors?
All PI7C9X1172BZHE 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 PI7C9X1172BZHE meets industry standards.
7.What is the process for return or replacement of PI7C9X1172BZHE?
All PI7C9X1172BZHE units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X1172BZHE, 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 PI7C9X1172BZHE part is unused and in its original packaging.
Return procedure for PI7C9X1172BZHE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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