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NXP Semiconductors SC18IS601IPW,128
- Part No.:
- SC18IS601IPW,128
- Manufacturer:
- NXP Semiconductors
- Category:
- Controllers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SC18IS601IPW,128.pdf
- Description:
- IC I2C BUS INTERFACE 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,540
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Product details
Overview
SC18IS601IPW,128 from NXP Semiconductors is an SPI-to-I²C bridge IC that enables a microcontroller's SPI interface to control I²C-bus slave devices. It operates as a single-master I²C controller with 400 kbit/s I²C speed, 1.2 Mbit/s SPI (Mode 3), and integrated 96-byte TX/RX buffers. Used in embedded systems requiring protocol translation between SPI hosts and I²C sensors or EEPROMs.
For engineers reviewing the SC18IS601IPW,128 datasheet, SC18IS601IPW,128 pinout, SC18IS601IPW,128 application, or SC18IS601IPW,128 equivalent, key selection criteria include its TSSOP16 package, 2.4–3.6 V supply range, 5 V-tolerant I/O pins, power-down mode with WAKEUP/IO4, and interrupt-driven transaction status reporting via INT pin.
Technical Context
The SC18IS601IPW,128 implements a dedicated hardware I²C-bus controller with full protocol handling-including START/STOP generation, arbitration, clock stretching, and ACK/NACK management-offloading timing-critical tasks from the host MCU. Its internal RC oscillator runs at 7.3728 MHz ±1%, enabling precise I²C clock derivation via programmable I2CClk register.
It supports four programmable GPIOs (GPIO0–GPIO3) configurable as quasi-bidirectional, push-pull, open-drain, or input-only, plus two fixed quasi-bidirectional I/Os (IO4/WAKEUP and IO5). All I/O pins feature Schmitt-triggered inputs with glitch suppression, and the INT pin is open-drain active-low for interrupt signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| SPI Interface | Slave Mode, Mode 3, up to 1.2 Mbit/s - compatible with standard MCU SPI peripherals without custom timing logic. |
| I²C-Bus Speed | Up to 400 kbit/s - supports Fast-mode I²C devices including sensors, RTCs, and EEPROMs. |
| Supply Voltage | 2.4 V to 3.6 V - matches common 3.3 V system rails; not 5 V tolerant for VDD. |
| I/O Voltage Tolerance | 5 V tolerant on all I/O pins - allows direct interfacing with 5 V peripherals without level shifters. |
| On-chip Buffers | 96-byte transmit + 96-byte receive buffer - enables burst transfers and reduces host polling overhead. |
| Power-Down Current | < 0.1 µA at 3.6 V - enables ultra-low-power operation in battery-powered applications. |
| Package | TSSOP16 (SOT403-1), 4.4 mm body width - surface-mount compatible with standard PCB assembly processes. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, 0.65 mm pitch, 4.4 mm body width, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GPIO0 (Pin 1) | Programmable I/O | Software-configurable as quasi-bidirectional, push-pull, open-drain, or input; Schmitt-triggered with glitch suppression. |
| CS (Pin 2) | Chip Select Input | Active-low enable signal; must be asserted to initiate SPI communication with SC18IS601IPW,128. |
| RESET (Pin 3) | Master Reset Input | Active-low asynchronous reset; clears internal registers and resets SPI/I²C hardware state. |
| VSS (Pin 4) | Ground | Primary ground reference for digital and I/O circuitry; requires low-impedance connection to system GND. |
| MISO (Pin 5) | SPI Data Output | Master-In-Slave-Out; returns register reads, buffer data, and status responses to host MCU. |
| MOSI (Pin 6) | SPI Data Input | Master-Out-Slave-In; accepts commands, addresses, and payload data from host SPI master. |
| SDA (Pin 7) | I²C Serial Data | Bidirectional open-drain I²C bus line; requires external pull-up resistor (typically 2.2–10 kΩ to VDD). |
| SCL (Pin 8) | I²C Serial Clock | Open-drain output driving I²C clock; generated by SC18IS601IPW,128 per I²C specification. |
| GPIO1 (Pin 9) | Programmable I/O | Same configuration options and electrical behavior as GPIO0; usable for status indication or control signals. |
| GPIO2 (Pin 10) | Programmable I/O | Configurable I/O with identical functionality to GPIO0/GPIO1; supports software-defined peripheral extension. |
| SCLK (Pin 11) | SPI Clock Input | Host-generated SPI clock; synchronous edge-triggered sampling of MOSI/MISO; supports up to 1.2 MHz. |
| VDD (Pin 12) | Supply Voltage | 2.4–3.6 V core and I/O supply; bypass capacitor (100 nF) required near pin for noise immunity. |
| GPIO3 (Pin 13) | Programmable I/O | Fourth software-configurable GPIO; supports same modes and input characteristics as GPIO0–GPIO2. |
| INT (Pin 14) | Interrupt Output | Open-drain active-low signal indicating transaction completion, error, or timeout; requires external pull-up. |
| WAKEUP/IO4 (Pin 15) | Wake-Up Input / I/O | Pulled LOW by host to exit power-down mode; functions as quasi-bidirectional I/O when active. |
| IO5 (Pin 16) | Quasi-bidirectional I/O | Fixed-function quasi-bidirectional pin; no software configuration; supports bidirectional data without direction control. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware I²C Controller | Fully autonomous I²C master with START/STOP, arbitration, clock stretching, and ACK/NACK handling - eliminates bit-banging firmware overhead. |
| Programmable GPIOs | Four GPIOs (GPIO0–GPIO3) configurable in four modes (quasi-bidirectional, push-pull, open-drain, input-only) - enables flexible system-level signal routing and control. |
| Interrupt-Driven Operation | Active-low INT pin signals transaction status (success, NACK, timeout, invalid count) - enables event-driven host firmware without continuous polling. |
| Power-Down Mode | Ultra-low-current sleep state entered via 0x30+0x5A+0xA5 command sequence; exited by pulling WAKEUP/IO4 LOW - extends battery life in portable devices. |
| Internal RC Oscillator | 7.3728 MHz ±1% trimmed oscillator - provides stable clock source for I²C timing without external crystal or clock generator. |
Applications
| Industrial Sensor Hub | Smart Metering Interface |
|---|---|
Use Scenario: Aggregating temperature, humidity, and pressure sensors (e.g., HTU21D, BMP280) onto a single I²C bus connected to an ARM Cortex-M host via SPI. IC Role / Device Role / Timing Role: SPI-to-I²C protocol translator acting as I²C master; handles arbitration, clock generation, and ACK/NACK sequencing independently. Use Value: Reduces host MCU firmware complexity by offloading I²C timing and error recovery; enables use of low-cost SPI-only MCUs with I²C peripherals. | Use Scenario: Interfacing metrology ICs (e.g., ADE7953) and secure EEPROMs (e.g., AT24MAC402) in electricity meters where SPI is used for main processor communication. IC Role / Device Role / Timing Role: Bridge IC managing time-critical I²C transactions while maintaining deterministic SPI response latency for real-time metering data capture. Use Value: Ensures reliable sensor and security IC access under variable load; supports 400 kbit/s I²C speed required for fast calibration data reads. |
| IoT Edge Node Gateway | Automotive Body Control Module |
Use Scenario: Connecting multiple I²C-based environmental and motion sensors (e.g., BME680, LIS2DH12) to an ESP32 host using its SPI interface in resource-constrained edge nodes. IC Role / Device Role / Timing Role: Protocol converter enabling SPI host to initiate and monitor I²C read/write sequences with automatic buffer management and status reporting. Use Value: Eliminates need for additional I²C-capable MCU pins; leverages existing SPI infrastructure while supporting hot-plug detection via INT-driven status flags. | Use Scenario: Integrating I²C door lock actuators, ambient light sensors, and EEPROM configuration storage into a CAN-connected BCM using an SPI-capable microcontroller. IC Role / Device Role / Timing Role: Dedicated I²C master controller coordinating multi-device I²C traffic without CPU intervention during CAN message processing. Use Value: Guarantees deterministic I²C timing independent of CAN interrupt latency; supports 5 V-tolerant I/O for legacy automotive sensor compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI-to-I²C bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCA9306DC,128 | Level-shifting I²C bus switch (no SPI interface); passive device requiring external MCU I²C control logic. | Cannot replace SC18IS601IPW,128 in SPI-hosted systems; only suitable where host has native I²C and needs voltage translation. | Select PCA9306DC,128 only when bridging 1.8 V/3.3 V I²C buses with existing I²C master - not a functional substitute for SC18IS601IPW,128. |
| MAX7340ETE+ | 16-bit I/O expander with I²C interface; no SPI slave capability or built-in I²C master logic. | Designed for GPIO expansion, not protocol translation; requires host to manage I²C timing and packetization. | Choose MAX7340ETE+ for adding I/Os to I²C systems - not viable as SPI-to-I²C bridge; SC18IS601IPW,128 remains necessary for true protocol conversion. |
Compared with PCA9306DC,128 and MAX7340ETE+, the SC18IS601IPW,128 uniquely integrates a full hardware I²C master controller with SPI slave interface, eliminating host firmware I²C stack requirements and enabling direct SPI-initiated transactions - a capability neither alternative provides.
Availability
SC18IS601IPW,128 is available at Aetrix Electronics and suitable for industrial sensor hubs, smart metering interfaces, IoT edge node gateways, and automotive body control modules requiring stable component supply across extended production lifecycles.
Supply support for SC18IS601IPW,128 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SC18IS601IPW,128 belongs to NXP's interface bridge product line, designed specifically to simplify integration between SPI-capable microcontrollers and I²C-based peripheral ecosystems in space- and power-constrained embedded systems.
FAQ
What is the primary function of the SC18IS601IPW,128?
The SC18IS601IPW,128 is a dedicated SPI-to-I²C bridge IC that enables a host microcontroller with only an SPI interface to communicate with standard I²C-bus slave devices. It acts as a hardware I²C master, handling all protocol details - including START/STOP, arbitration, clock generation, and ACK/NACK - without requiring host firmware to implement I²C timing or state machines. This makes SC18IS601IPW,128 ideal for systems where MCU resources are limited or I²C support is absent.
Does the SC18IS601IPW,128 support 5 V logic levels?
Yes, the SC18IS601IPW,128 features 5 V-tolerant I/O pins (GPIO0–GPIO3, SDA, SCL, INT, WAKEUP/IO4, IO5, CS, RESET, MISO, MOSI), allowing direct connection to 5 V peripherals without external level shifters. However, its VDD supply must remain within 2.4 V to 3.6 V; applying 5 V to VDD will damage the SC18IS601IPW,128. When 5 V is applied to quasi-bidirectional pins, current flows from the pin to VDD, increasing power consumption - thus 5 V use on those pins is discouraged.
How does the SC18IS601IPW,128 indicate transaction status?
The SC18IS601IPW,128 uses its open-drain INT pin to signal transaction events: active-low pulses indicate completion (0xF0), slave address NACK (0xF1), data byte NACK (0xF2), bus busy (0xF3), timeout (0xF8), or invalid data count (0xF9). The host reads the I2CStat register (address 0x04) to determine the exact status. Each interrupt is cleared automatically upon reading I2CStat or by asserting RESET. This design allows SC18IS601IPW,128 to operate asynchronously with minimal host polling overhead.
Can the SC18IS601IPW,128 operate in low-power modes?
Yes, the SC18IS601IPW,128 supports a power-down mode entered via the SPI command sequence 0x30 → 0x5A → 0xA5. In this state, the internal oscillator stops and the device ignores SPI activity, reducing supply current to less than 0.1 µA at 3.6 V. Exit is triggered by pulling the WAKEUP/IO4 pin LOW. Before entering power-down, WAKEUP/IO4 must be set HIGH. After wake-up, the pin reverts to its configured I/O function. This capability makes SC18IS601IPW,128 suitable for battery-powered applications requiring intermittent I²C access.
What GPIO configuration options does the SC18IS601IPW,128 provide?
The SC18IS601IPW,128 offers four programmable GPIOs (GPIO0–GPIO3), each configurable via the IOConfig register (0x00) into one of four modes: quasi-bidirectional (default), push-pull, open-drain, or input-only. Quasi-bidirectional mode allows bidirectional data flow without direction control, using weak/strong pull-ups. Push-pull provides higher drive strength for sourcing current; open-drain requires external pull-up; input-only disables output drivers. IO4/WAKEUP and IO5 are fixed quasi-bidirectional and cannot be reconfigured. All GPIOs include Schmitt-triggered inputs with glitch suppression.
SC18IS601IPW,128 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Programmable:
- Not Verified
- Protocol:
- I2C
- Function:
- Controller
- Interface:
- SPI
- Standards:
- -
- Voltage - Supply:
- 2.4V ~ 3.6V
- Current - Supply:
- 11mA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Grade:
- -
- Qualification:
- -
SC18IS601IPW,128 FAQ
1.How can I place an order for SC18IS601IPW,128 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC18IS601IPW,128 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 SC18IS601IPW,128 reliable?
The price and inventory of SC18IS601IPW,128 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC18IS601IPW,128 is usually 5 days.
3.What payment methods are accepted for SC18IS601IPW,128?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC18IS601IPW,128 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC18IS601IPW,128?
SC18IS601IPW,128 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC18IS601IPW,128 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 SC18IS601IPW,128?
For technical support, including SC18IS601IPW,128 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC18IS601IPW,128 requirements.
6.How does Aetrix verify that SC18IS601IPW,128 is sourced from the original manufacturer or authorized distributors?
All SC18IS601IPW,128 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 SC18IS601IPW,128 meets industry standards.
7.What is the process for return or replacement of SC18IS601IPW,128?
All SC18IS601IPW,128 units undergo pre-shipment inspection (PSI). If there is an issue with SC18IS601IPW,128, 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 SC18IS601IPW,128 part is unused and in its original packaging.
Return procedure for SC18IS601IPW,128:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC18IS601IPW,128 Tags
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PTN5150AHXMP
NXP Semiconductors
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USB3740B-AI9-TR
Microchip Technology
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USB3740B-AI2-TR
Microchip Technology
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Microchip Technology
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onsemi
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MCP2518FDT-E/QBB
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