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Diodes Incorporated PI7C9X1170BZDEX
- Part No.:
- PI7C9X1170BZDEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Controllers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
PI7C9X1170BZDEX.pdf
- Description:
- IC BRIDGE I2C/SPI TO UART 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,454
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Product details
Overview
PI7C9X1170BZDEX from Diodes Incorporated (acquired Pericom) is a single-channel I²C-bus/SPI-to-UART bridge controller with 64-byte TX/RX FIFOs, programmable baud rates up to 16 Mbps (4× sampling), RS-485 auto-direction control via RTS#, and IrDA SIR support up to 1.152 Mbps. It implements a 16C450-compatible register set and operates across 1.8 V, 2.5 V, or 3.3 V supply rails.
For engineers reviewing the PI7C9X1170BZDEX datasheet, PI7C9X1170BZDEX pinout, PI7C9X1170BZDEX application, or PI7C9X1170BZDEX equivalent, key selection criteria include UART bridging interface protocol (I²C vs SPI slave mode), hardware/software flow control implementation, RS-485 half-duplex driver control logic, GPIO count (up to 8), and package compatibility (TSSOP16/TSSOP24/QFN24).
Technical Context
This device functions as a bidirectional protocol converter between I²C-bus (fast-mode, 400 kHz) or SPI (mode 0, slave-only, up to 20 Mbps) and asynchronous serial (RS-232/RS-485/IrDA). Its register architecture mirrors the industry-standard 16C450, enabling drop-in firmware reuse while adding enhanced features including fractional baud rate generation, independent RX/TX FIFO trigger level programming, and automatic RTS/CTS flow control with configurable halt/resume thresholds.
The UART supports full-duplex operation with dedicated TX/RX paths, integrated line break detection/generation, special character recognition, and internal loopback for diagnostics. RS-485 direction control is implemented via RTS# output with polarity inversion option, and IrDA encoding/decoding is handled on-chip without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Baud Rate Max | 16 Mbps (4× sampling clock); enables high-speed industrial serial links without oversampling penalty. |
| FIFO Depth | 64 bytes each for TX and RX; reduces host CPU interrupt load in burst-data applications. |
| Interface Support | I²C-bus (slave only, fast-mode) and SPI (slave only, mode 0); dual-protocol flexibility for host MCU choice. |
| GPIO Count | Up to 8 programmable I/O pins; provides system-level control signals or status inputs without external logic. |
| Supply Voltage | 1.8 V / 2.5 V / 3.3 V; supports mixed-voltage designs and low-power battery-operated systems. |
| RS-485 Control | RTS#-driven auto-direction with polarity inversion; eliminates need for external transceiver direction logic. |
| IrDA Support | SIR at 115.2 kbps (standard) or 1.152 Mbps (optional); enables infrared communication without discrete encoder/decoder. |
Pinout & Package
PI7C9X1170BZDEX is available in RoHS-compliant TSSOP16, TSSOP24, and QFN24 packages. Pin assignments differ across packages; the TSSOP24 and QFN24 variants provide full GPIO access (GPIO0–GPIO7), while TSSOP16 omits GPIO2–GPIO7 and uses shared pins for DSR#/DTR#/CD#/RI# functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I2C/SPI# | Interface Select | High = I²C mode; Low = SPI mode; determines SDA/SCL vs SO/SI/CS# functionality. |
| TX / RX | UART Data I/O | Full-duplex serial data path; supports standard UART levels or IrDA-encoded signals. |
| RTS# / CTS# | Hardware Flow Control | Active-low signals enabling Auto-RTS (RX FIFO threshold-driven) and Auto-CTS (transmit gating). |
| GPIO0–GPIO7 | Programmable I/O | Configurable as input, output, or alternate function (DSR#, DTR#, CD#, RI#) per register setting. |
| IRQ# | Interrupt Output | Open-drain active-low interrupt signal indicating UART event (RX ready, TX empty, error, etc.). |
| RESET# | Asynchronous Reset | Active-low reset pulse ≥40 ns clears internal registers; TX goes idle HIGH, RX ignored. |
Key Features
| Feature | Design Value |
|---|---|
| 16C450 Register Compatibility | Enables legacy UART driver reuse without firmware modification; simplifies migration from discrete UARTs. |
| Independent RX/TX FIFO Trigger Levels | Reduces interrupt frequency by allowing custom buffer fill thresholds-e.g., trigger RX interrupt at 32 bytes instead of default 1. |
| Auto RS-485 Direction Control | Eliminates external direction logic by using RTS# output with configurable polarity and timing thresholds. |
| Programmable Xon/Xoff Characters | Supports dual Xon/Xoff pairs (Xon1/Xoff1 and Xon2/Xoff2) for robust software flow control in noisy environments. |
| Internal Loopback Mode | Validates UART functional integrity without external cabling-TX output internally routed to RX input path. |
Applications
| Industrial PLC Communication | Smart Metering Interface |
|---|---|
|
Use Scenario: Connecting microcontroller-based PLC CPUs to legacy RS-485 fieldbus networks for sensor/actuator control. IC Role / Device Role / Timing Role: UART bridge translating SPI commands from ARM Cortex-M host into RS-485 serial frames with auto-direction control. Use Value: Eliminates need for separate SPI-to-RS485 transceivers and direction logic; 64-byte FIFO prevents data loss during PLC scan cycle jitter. |
Use Scenario: Enabling two-way AMI (Advanced Metering Infrastructure) communication between meter SoC and optical/RF modules. IC Role / Device Role / Timing Role: I²C slave bridging meter application processor to IrDA or RS-232 diagnostic port with Xon/Xoff flow control. Use Value: On-chip IrDA encoder/decoder supports 1.152 Mbps optical handshake; low standby current extends battery life in portable readers. |
| POS Terminal Serial Expansion | Medical Device Data Logging |
|
Use Scenario: Adding isolated serial ports to compact point-of-sale terminals for receipt printers and barcode scanners. IC Role / Device Role / Timing Role: SPI-to-UART bridge providing multiple virtual COM ports via single SPI bus, managed by Linux tty layer. Use Value: 8 GPIOs configure printer busy/status lines and scanner trigger signals; TSSOP16 footprint saves PCB area in space-constrained enclosures. |
Use Scenario: Interfacing ECG/SpO₂ sensor modules to embedded host MCU via RS-232 for real-time waveform streaming. IC Role / Device Role / Timing Role: Full-duplex UART with hardware flow control ensuring zero packet loss during high-resolution analog data bursts. Use Value: 64-byte RX FIFO absorbs transient USB host latency; programmable parity/stop bits match legacy medical equipment framing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UART bridge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16IS752IPW | 2-channel I²C/SPI UART with 64-byte FIFOs; no RS-485 direction control or IrDA support. | Preferred for multi-port expansion where RS-485 auto-control is unnecessary and channel density is critical. | Select when needing dual UARTs on same bus; avoid if RS-485 half-duplex control or infrared is required. |
| MAX3107EEG+ | Single-channel SPI UART with 128-byte FIFOs; supports automatic RTS/CTS but lacks I²C interface and GPIOs. | Better suited for high-throughput SPI-only systems requiring deeper buffering and lower interrupt overhead. | Choose for SPI-centric designs demanding >64-byte buffering; not viable for I²C hosts or GPIO-dependent control logic. |
Compared with SC16IS752IPW and MAX3107EEG+, PI7C9X1170BZDEX uniquely combines I²C/SPI dual-interface support, RS-485 auto-direction, IrDA SIR, and 8 GPIOs in a single-channel solution-making it optimal for cost-sensitive, feature-integrated edge nodes.
Availability
PI7C9X1170BZDEX is available at Aetrix Electronics and suitable for industrial automation, smart metering, POS terminal design, and medical data logging requiring stable component supply and long-term manufacturability.
Supply support for PI7C9X1170BZDEX 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 acquired Pericom Semiconductor in 2017, integrating its high-performance interface and timing solutions into a broad portfolio of discrete, analog, and mixed-signal ICs.
The PI7C9X1170BZDEX belongs to Pericom's legacy UART bridge product line, designed specifically for protocol translation in resource-constrained embedded systems requiring low power, small footprint, and multi-standard interoperability.
FAQ
Does PI7C9X1170BZDEX support both I²C and SPI simultaneously?
No. The I2C/SPI# pin selects one interface at power-up: HIGH configures I²C-bus slave mode (SDA/SCL active), LOW configures SPI slave mode (SO/SI/CS# active). Both interfaces cannot operate concurrently; switching requires hardware reconfiguration and device reset.
What is the maximum crystal frequency supported for UART timing?
The XTAL1 input accepts up to 24 MHz crystal or external clock; the internal baud rate generator supports divisors from 1 to 65535, enabling precise fractional baud rates across the full 16 Mbps range without external PLL circuitry.
How does RS-485 auto-direction work with RTS# on PI7C9X1170BZDEX?
RTS# drives the RS-485 transceiver DE/RE pin directly. When transmitting, RTS# asserts LOW to enable driver; when idle or receiving, RTS# deasserts HIGH to disable driver. Polarity inversion (via register bit) allows compatibility with active-HIGH DE/RE logic.
Can GPIO pins be used as modem control signals like DTR# or DSR#?
Yes. GPIO4–GPIO7 are multiplexed with DSR#, DTR#, CD#, and RI# functions. Configuration is register-controlled: writing to the GPIO direction and function registers enables either general-purpose I/O or dedicated modem signal behavior per pin.
PI7C9X1170BZDEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 24-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:
- 3mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-TQFN (4x4)
- Grade:
- -
- Qualification:
- -
PI7C9X1170BZDEX FAQ
1.How can I place an order for PI7C9X1170BZDEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI7C9X1170BZDEX 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 PI7C9X1170BZDEX reliable?
The price and inventory of PI7C9X1170BZDEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI7C9X1170BZDEX is usually 5 days.
3.What payment methods are accepted for PI7C9X1170BZDEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI7C9X1170BZDEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI7C9X1170BZDEX?
PI7C9X1170BZDEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI7C9X1170BZDEX 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 PI7C9X1170BZDEX?
For technical support, including PI7C9X1170BZDEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI7C9X1170BZDEX requirements.
6.How does Aetrix verify that PI7C9X1170BZDEX is sourced from the original manufacturer or authorized distributors?
All PI7C9X1170BZDEX 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 PI7C9X1170BZDEX meets industry standards.
7.What is the process for return or replacement of PI7C9X1170BZDEX?
All PI7C9X1170BZDEX units undergo pre-shipment inspection (PSI). If there is an issue with PI7C9X1170BZDEX, 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 PI7C9X1170BZDEX part is unused and in its original packaging.
Return procedure for PI7C9X1170BZDEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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