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Renesas R8A66150SP#D1
- Part No.:
- R8A66150SP#D1
- Manufacturer:
- Renesas
- Category:
- I/O Expanders
- Package:
- -
- Datasheet:
-
R8A66150SP#D1.pdf
- Description:
- 12-BIT I/O EXPANDER
- Quantity:
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Product details
Overview
R8A66150SP#D1 from Renesas Electronics is a 12-bit bidirectional I/O expander IC with independent serial-in/parallel-out and parallel-in/serial-out shift registers, Schmitt-trigger inputs on DI/CLK/CS/S, N-channel open-drain outputs on DO/D1–D12, and configurable per-pin I/O direction via serial command. It operates from 2.0 V to 6.0 V and supports industrial temperature range (−40 °C to +85 °C), enabling MCU port extension in space-constrained embedded control systems.
For engineers reviewing the R8A66150SP#D1 datasheet, R8A66150SP#D1 pinout, R8A66150SP#D1 application, or R8A66150SP#D1 equivalent, key selection considerations include its dual-shift-register architecture, per-bit I/O mode control via serial input, high-noise-margin Schmitt inputs, open-drain output drive capability, and compatibility with 3.3 V and 5 V MCU interfaces.
Technical Context
The R8A66150SP#D1 implements two independent CMOS shift registers: Shift Register 1 handles parallel-in/serial-out (PISO) for loading D1–D12 data onto DO, while Shift Register 2 manages serial-in/parallel-out (SIPO) for capturing DI data into D1–D12. Both operations are synchronized to CLK edges and triggered by /CS transitions.
Direction control of D1–D12 is achieved bit-wise via serial data written to DI during PISO mode: "H" sets the corresponding pin as high-impedance input, "L" configures it as active-low open-drain output. The /S pin forces all outputs (DO and D1–D12) into high-impedance state at power-on or during reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IO Count | 12 bidirectional parallel I/O pins (D1–D12) with per-bit direction control via serial command |
| Supply Voltage | 2.0 V to 6.0 V - supports direct interface with both 3.3 V and 5 V MCUs without level shifting |
| Input Thresholds | Schmitt-trigger inputs (DI, CLK, /CS, /S) with VT+ = 0.35×Vcc / VT− = 0.20×Vcc - ensures noise immunity in noisy industrial environments |
| Output Type | N-ch open-drain outputs (DO, D1–D12) - enables wired-OR logic, I²C-compatible bus sharing, and flexible pull-up voltage selection |
| Max Clock Frequency | 1.9 MHz - allows >500 kbps serial throughput for real-time peripheral expansion |
| Propagation Delay | tPLZ/tPZL ≤ 400 ns (CLK→DO, /CS→D1–D12) - guarantees timing compliance in fast-sampling control loops |
| Operating Temp | −40 °C to +85 °C - qualified for industrial-grade embedded applications including motor drives and PLC I/O modules |
Pinout & Package
Package: 20-pin SOP (PRSP0020DG-A, 20P2X-C), body size 12.8 mm × 7.6 mm, 1.27 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DO | Serial Data Output | N-ch open-drain output carrying 12-bit PISO data; high-impedance when /CS high or after 13th clock edge |
| DI | Serial Data Input | Schmitt-trigger input receiving 12-bit SIPO data and I/O direction bits; sampled on CLK rising edge |
| CLK | Serial Clock Input | Schmitt-trigger clock input controlling shift timing; negative edge clocks PISO output, positive edge clocks SIPO input |
| /CS | Chip Select Input | Active-low enable: falling edge triggers PISO latch/load, rising edge triggers SIPO parallel update to D1–D12 |
| /S | Set Input | Active-low master reset: forces DO and D1–D12 into high-impedance state regardless of internal state |
| D1–D12 | Parallel I/O Pins | N-ch open-drain bidirectional pins; direction set per-bit via serial "H" (input) or "L" (output) on DI during PISO cycle |
| Vcc | Positive Supply | Power supply pin (2.0–6.0 V); decoupling capacitor required between Vcc and GND near pin 5 |
| GND | Ground | Two dedicated ground pins (pins 7 and 10) reduce ground bounce in high-speed serial operation |
Key Features
| Feature | Design Value |
|---|---|
| Independent Dual Shift Registers | Enables simultaneous serial data capture (SIPO) and parallel data transmission (PISO), eliminating sequential bottlenecks in full-duplex MCU communication |
| Per-Pin I/O Direction Control | Each D1–D12 pin's input/output state is individually configured via serial command - no fixed-direction ports or external configuration resistors needed |
| Schmitt-Trigger Inputs | VIH/VIL thresholds scale with Vcc (0.75×Vcc / 0.25×Vcc), ensuring robust operation across 2.0–6.0 V supply range and rejecting <100 ns noise spikes |
| Open-Drain Outputs with High-Z Control | All outputs support wired-OR bus topologies; /S pin provides hardware-level global disable for safe hot-swap or system reset |
| Industrial Temperature Range | Guaranteed functionality from −40 °C to +85 °C without derating - suitable for under-hood automotive sensors and factory-floor controllers |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Adding 12 discrete digital inputs/outputs to a resource-limited microcontroller in a programmable logic controller rack. IC Role / Device Role / Timing Role: I/O expander providing serial-to-parallel and parallel-to-serial conversion, with per-pin direction control synchronized to MCU SPI-like timing. Use Value: Reduces MCU GPIO count requirement by 12 pins while maintaining full bidirectional control and noise-immune signal acquisition at up to 1.9 MHz clock rate. | Use Scenario: Managing door lock actuators, window lift switches, and interior lighting controls in a centralized body electronics module. IC Role / Device Role / Timing Role: Bidirectional I/O interface translating MCU serial commands into parallel actuator drive signals and switch status reads, operating across automotive temperature extremes. Use Value: Enables single-MCU control of 12 diverse loads/inputs using only 4 serial lines (CLK, DI, DO, /CS), with Schmitt inputs rejecting EMI from motors and solenoids. |
| Smart Energy Meter Interface | Medical Diagnostic Equipment Panel |
Use Scenario: Isolating and expanding digital I/O for tariff switching relays, tamper detection switches, and LED status indicators in a Class 0.5 electricity meter. IC Role / Device Role / Timing Role: Level-shifting, noise-immune I/O buffer between isolated MCU domain and 24 V relay/switch interface circuitry. Use Value: Supports direct 5 V operation with open-drain outputs driving external pull-ups to 24 V - eliminates need for discrete level translators or optocouplers per channel. | Use Scenario: Interfacing tactile keypad, emergency stop buttons, and status LEDs on a portable ultrasound device front panel. IC Role / Device Role / Timing Role: Low-power, ESD-hardened I/O expander handling user input scanning and LED multiplexing under strict EMC requirements. Use Value: Quiescent current ≤100 µA at 6 V enables battery-powered operation; Schmitt inputs tolerate contact bounce and ESD events up to ±2 kV (HBM). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I/O expander applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX7312ATL+ | 16-bit I²C interface, integrated 25 mA sink drivers, no per-pin direction control - fixed I/O assignment per register | Requires I²C host; lacks independent dual-shift-register architecture and Schmitt inputs | Choose for I²C-based systems needing higher drive strength and simpler register mapping |
| PCA9555DWR | 16-bit I²C expander with interrupt output, 100 kHz/400 kHz modes, no serial clock pin - relies on I²C protocol timing | No native SPI-like interface; incompatible with custom serial protocols requiring precise CLK edge control | Prefer when system already uses I²C infrastructure and interrupt-driven polling is acceptable |
Compared with MAX7312ATL+ and PCA9555DWR, the R8A66150SP#D1 offers deterministic timing via dedicated CLK and /CS pins, per-bit I/O configurability without register writes, and Schmitt inputs optimized for noisy industrial wiring - making it uniquely suited for SPI-adjacent MCU port expansion where protocol flexibility and noise immunity are critical.
Availability
R8A66150SP#D1 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and smart energy meter interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for R8A66150SP#D1 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
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.
The R8A66150SP#D1 belongs to Renesas' legacy I/O expansion IC family designed specifically for MCU port extension in cost-sensitive, noise-prone industrial control systems - emphasizing simplicity, timing determinism, and wide-voltage interoperability over protocol abstraction.
FAQ
What is the primary function of the R8A66150SP#D1 in an embedded system?
The R8A66150SP#D1 serves as a 12-bit bidirectional I/O expander that extends microcontroller GPIO resources using serial communication. It implements two independent shift registers to simultaneously accept serial input data while outputting parallel data, enabling efficient full-duplex peripheral interfacing without consuming multiple MCU pins. Its per-pin I/O direction control and Schmitt-trigger inputs make it especially valuable in electrically noisy industrial environments.
How does the R8A66150SP#D1 configure individual pin direction (input vs. output)?
The R8A66150SP#D1 configures each of the D1–D12 pins as input or output via serial data written to the DI pin during the serial-in/parallel-out (SIPO) phase. A logic "H" in the corresponding bit position sets that pin to high-impedance input mode; a logic "L" configures it as an active-low open-drain output. This occurs automatically upon /CS rising edge, requiring no separate configuration register writes.
What are the absolute maximum ratings for supply voltage and operating temperature of the R8A66150SP#D1?
The R8A66150SP#D1 has an absolute maximum supply voltage (Vcc) of −0.5 V to +7.0 V and a storage temperature range of −65 °C to +150 °C. Its recommended operating conditions specify Vcc from 2.0 V to 6.0 V and an operating temperature range of −40 °C to +85 °C - fully qualifying it for industrial and automotive under-hood applications where thermal stability and wide voltage tolerance are essential.
Does the R8A66150SP#D1 support true bidirectional data flow on the same pins?
Yes, the R8A66150SP#D1 supports true bidirectional operation on D1–D12 pins through dynamic per-bit configuration. Each pin functions either as an input (high-impedance, Schmitt-triggered) or as an open-drain output depending on the serial command loaded during the SIPO cycle. This eliminates the need for external direction-control logic or tri-state buffers, simplifying PCB layout and reducing BOM count compared to fixed-direction expanders.
What is the role of the /S (Set) pin on the R8A66150SP#D1?
The /S pin on the R8A66150SP#D1 is an active-low hardware reset that forces all outputs - including DO and D1–D12 - into a high-impedance state regardless of internal register contents or /CS status. This provides fail-safe isolation during power-up, brownout, or system-level reset sequences, preventing unintended actuation of connected peripherals and ensuring predictable startup behavior in safety-critical applications.
R8A66150SP#D1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of I/O:
- -
- Interface:
- -
- Interrupt Output:
- -
- Features:
- -
- Output Type:
- -
- Current - Output Source/Sink:
- -
- Clock Frequency:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
R8A66150SP#D1 FAQ
1.How can I place an order for R8A66150SP#D1 through Aetrix?
Please submit a Request for Quotation (RFQ) for R8A66150SP#D1 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 R8A66150SP#D1 reliable?
The price and inventory of R8A66150SP#D1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R8A66150SP#D1 is usually 5 days.
3.What payment methods are accepted for R8A66150SP#D1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R8A66150SP#D1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R8A66150SP#D1?
R8A66150SP#D1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R8A66150SP#D1 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 R8A66150SP#D1?
For technical support, including R8A66150SP#D1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R8A66150SP#D1 requirements.
6.How does Aetrix verify that R8A66150SP#D1 is sourced from the original manufacturer or authorized distributors?
All R8A66150SP#D1 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 R8A66150SP#D1 meets industry standards.
7.What is the process for return or replacement of R8A66150SP#D1?
All R8A66150SP#D1 units undergo pre-shipment inspection (PSI). If there is an issue with R8A66150SP#D1, 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 R8A66150SP#D1 part is unused and in its original packaging.
Return procedure for R8A66150SP#D1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R8A66150SP#D1 Tags
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