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NXP Semiconductors SC16C852LIB,157
- Part No.:
- SC16C852LIB,157
- Manufacturer:
- NXP Semiconductors
- Package:
- 48-LQFP
- Datasheet:
-
SC16C852LIB,157.pdf
- Description:
- IC UART DUAL W/FIFO 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,151
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Product details
Overview
SC16C852LIB,157 from NXP Semiconductors is a 1.8 V dual-channel UART IC with 128-byte transmit/receive FIFOs, IrDA 1.0 encoder/decoder, and programmable baud rate generators supporting up to 5 Mbit/s (with 80 MHz clock). It operates in Intel (16-mode) or Motorola (68-mode) bus interface configurations and targets embedded serial communication in industrial gateways and multi-protocol modems.
For engineers reviewing the SC16C852LIB,157 datasheet, SC16C852LIB,157 pinout, SC16C852LIB,157 application, or SC16C852LIB,157 equivalent, key selection considerations include dual-channel concurrent write capability, RS-485 driver turn-around timing control, 128-level programmable FIFO interrupt triggers, and low-power mode activation via LOWPWR pin.
Technical Context
The SC16C852LIB,157 implements two independent UART channels (A and B) with separate 128-byte FIFOs, independent baud rate generators, and full modem control logic (CTS/RTS/DTR/DSR/RI/CD). Its register architecture supports both legacy SC16C652B compatibility and extended mode for 128-level FIFO trigger programming.
It features dual bus interface selectability via the 16/68 pin, enabling operation with either Intel-style IOR/IOW strobes or Motorola-style R/W and address lines A0–A3. Internal loopback, automatic RS-485 address detection, and hardware/software flow control (Xon/Xoff, RTS/CTS) are implemented at silicon level without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.8 V nominal - enables direct interfacing with low-voltage microcontrollers and reduces system power consumption. |
| Max Data Rate | 5 Mbit/s - achievable with 80 MHz external clock; supports high-speed modem and industrial serial links. |
| FIFO Depth | 128-byte TX/RX per channel - reduces CPU interrupt load and enables burst data handling in multi-channel systems. |
| IrDA Support | Version 1.0 up to 115.2 kbit/s - integrated encoder/decoder eliminates need for external IrDA PHY. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial environments including factory automation and outdoor communications equipment. |
| Bus Interface | Selectable Intel (16-mode) or Motorola (68-mode) - allows drop-in integration into legacy 8051, ARM, or ColdFire-based designs. |
| RS-485 Features | Automatic driver turn-around with programmable delay and 9-bit address detection - simplifies half-duplex bus arbitration without software overhead. |
Pinout & Package
SC16C852LIB,157 is supplied in LQFP48 package (SOT313-2), measuring 7 × 7 × 1.4 mm, with exposed pad thermal enhancement. Pin functions are defined for both Intel and Motorola bus modes via the 16/68 select pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A2 | Address select inputs | Select internal register bank (A/B channel and register offset); used in both 16- and 68-mode addressing. |
| CSA / CSB | Chip select inputs | In 16-mode: independent selects for UART A and B; in 68-mode: CS + A3 jointly select channel. |
| TXA / TXB, RXA / RXB | Serial I/O | Dual independent UART data paths; support simultaneous full-duplex operation on both channels. |
| TXRDYA / TXRDYB, RXRDYA / RXRDYB | FIFO status outputs | Active-low ready signals for DMA transfers - indicate FIFO occupancy relative to programmed trigger levels. |
| LOWPWR | Power management input | Active-high signal that disables oscillator and isolates host bus interface - reduces quiescent current during idle periods. |
| 16/68 | Bus interface mode select | Configures pin behavior: logic HIGH = Intel mode (IOR/IOW); logic LOW = Motorola mode (R/W, A0–A3). |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel concurrent write | Enables simultaneous register access to both UART A and B - eliminates inter-channel latency in time-critical applications. |
| 128-level programmable FIFO triggers | Allows precise tuning of interrupt generation and DMA initiation points - optimizes CPU utilization across varying data throughput profiles. |
| Automatic RS-485 turn-around | Hardware-controlled driver enable/disable with user-defined delay - prevents bus contention in half-duplex networks without firmware intervention. |
| Enhanced Sleep mode | LOWPWR pin activates full bus isolation and oscillator shutdown - achieves ultra-low standby current while preserving register state. |
| IrDA 1.0 encoder/decoder | Integrated physical layer for infrared communication - removes need for external transceiver and simplifies PCB layout. |
Applications
| Industrial Serial Gateway | Multi-Protocol Modem |
|---|---|
Use Scenario: Aggregating RS-232/RS-485 field devices into Ethernet or cellular backhaul using an ARM-based controller. IC Role / Device Role / Timing Role: Dual UART handles concurrent upstream/downstream serial streams with independent baud rates and flow control. Use Value: 128-byte FIFOs reduce interrupt frequency by >75% vs. 16-byte FIFO UARTs, freeing CPU cycles for protocol translation and security processing. |
Use Scenario: Supporting simultaneous PSTN dial-up and V.34 fax transmission in a single-board modem design. IC Role / Device Role / Timing Role: UART A manages AT command interface; UART B handles data/fax channel with IrDA fallback. Use Value: Independent programmable baud generators allow concurrent 57.6 kbit/s data and 14.4 kbit/s fax signaling without clock domain conflict. |
| RS-485 Building Automation Node | Low-Power Remote Terminal Unit (RTU) |
Use Scenario: Distributed HVAC controller communicating over daisy-chained RS-485 bus with master polling. IC Role / Device Role / Timing Role: SC16C852LIB,157 provides automatic RS-485 driver turn-around and 9-bit address detection for node identification. Use Value: Hardware-managed turn-around eliminates software timing jitter, ensuring reliable bus arbitration at 115.2 kbit/s over 1200 m cable runs. |
Use Scenario: Solar-powered telemetry unit transmitting sensor data via GPRS every 15 minutes with 99% sleep duty cycle. IC Role / Device Role / Timing Role: LOWPWR pin synchronizes UART shutdown with MCU deep-sleep mode; wake-on-RX interrupts restore full operation. Use Value: Active current reduced to <10 µA in LOWPWR mode - extends battery life beyond 5 years in intermittent reporting applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual UART applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SC16C652BIB,157 | 32-byte FIFOs, no IrDA, no RS-485 turn-around timer, max 3 Mbit/s | Limited to legacy systems requiring pin compatibility but not advanced features | Choose when cost sensitivity outweighs need for 128-byte FIFOs or IrDA. |
| TL16C752BIPM | 3.3 V supply, 64-byte FIFOs, no IrDA, TI-specific register mapping | Requires voltage translation and firmware adaptation; lacks RS-485 auto-turnaround | Consider only if existing TI ecosystem mandates use and 1.8 V operation is not required. |
Compared with SC16C652BIB,157 and TL16C752BIPM, the SC16C852LIB,157 delivers higher FIFO depth, integrated IrDA, and deterministic RS-485 timing control - making it optimal for new industrial designs where CPU offload, infrared fallback, and robust half-duplex bus control are critical.
Availability
SC16C852LIB,157 is available at Aetrix Electronics and suitable for industrial serial gateways, multi-protocol modems, RS-485 building automation nodes, low-power RTUs, and embedded telecom interfaces requiring stable component supply and long-term manufacturability.
Supply support for SC16C852LIB,157 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with core expertise in mixed-signal and RF technologies.
The SC16C852LIB,157 belongs to NXP's high-performance UART product line, designed specifically for demanding embedded serial communication where low-voltage operation, dual-channel concurrency, and advanced flow control are essential.
FAQ
What bus interface modes does the SC16C852LIB,157 support?
The SC16C852LIB,157 supports both Intel-style (16-mode) and Motorola-style (68-mode) host interfaces, selected by the logic level on the 16/68 pin. In 16-mode, it uses IOR/IOW strobes and A0–A2 address lines; in 68-mode, it uses R/W and A0–A3. This flexibility allows seamless integration into diverse processor architectures without redesigning the host interface logic.
How does the SC16C852LIB,157 handle RS-485 half-duplex operation?
The SC16C852LIB,157 provides hardware-assisted RS-485 operation including automatic driver turn-around with programmable delay and 9-bit address detection. When enabled, the device asserts DE (driver enable) before transmission and de-asserts it after the stop bit, with configurable timing to prevent bus collisions - eliminating software timing dependencies and improving reliability in noisy industrial environments.
What is the function of the LOWPWR pin on the SC16C852LIB,157?
The LOWPWR pin on the SC16C852LIB,157 is an active-high input that places the device into ultra-low-power mode: the internal oscillator stops, and host interface pins (D0–D7, A0–A2, CSA/CSB, IOR/IOW or R/W) are isolated from the bus. Upon de-assertion, the device resets automatically, restoring all registers to default states - enabling predictable power cycling in battery-operated remote terminals.
Can the SC16C852LIB,157 operate with non-standard baud rates?
Yes, the SC16C852LIB,157 supports non-standard baud rates via its high-resolution clock prescaler (0–15, granularity 1/16) and fully programmable divisor latch. This allows precise generation of custom rates such as 312.5 kbit/s for CAN FD bridging or 460.8 kbit/s for proprietary protocols - without requiring external clock sources or firmware workarounds.
Is the SC16C852LIB,157 pin-compatible with earlier NXP UARTs?
The SC16C852LIB,157 is pin-, function-, and software-compatible with the SC16C652B in LQFP48 packaging. However, it extends functionality with 128-byte FIFOs, IrDA, RS-485 turn-around, and enhanced sleep mode. Migration requires no PCB changes but unlocks performance gains through updated firmware initialization sequences for extended mode registers.
SC16C852LIB,157 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Features:
- -
- Number of Channels:
- 2, DUART
- FIFO's:
- 128 Byte
- Protocol:
- RS485
- Data Rate (Max):
- 5Mbps
- Voltage - Supply:
- 1.8V
- With Auto Flow Control:
- Yes
- With IrDA Encoder/Decoder:
- Yes
- With False Start Bit Detection:
- Yes
- With Modem Control:
- Yes
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
SC16C852LIB,157 FAQ
1.How can I place an order for SC16C852LIB,157 through Aetrix?
Please submit a Request for Quotation (RFQ) for SC16C852LIB,157 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 SC16C852LIB,157 reliable?
The price and inventory of SC16C852LIB,157 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SC16C852LIB,157 is usually 5 days.
3.What payment methods are accepted for SC16C852LIB,157?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SC16C852LIB,157 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SC16C852LIB,157?
SC16C852LIB,157 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SC16C852LIB,157 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 SC16C852LIB,157?
For technical support, including SC16C852LIB,157 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SC16C852LIB,157 requirements.
6.How does Aetrix verify that SC16C852LIB,157 is sourced from the original manufacturer or authorized distributors?
All SC16C852LIB,157 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 SC16C852LIB,157 meets industry standards.
7.What is the process for return or replacement of SC16C852LIB,157?
All SC16C852LIB,157 units undergo pre-shipment inspection (PSI). If there is an issue with SC16C852LIB,157, 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 SC16C852LIB,157 part is unused and in its original packaging.
Return procedure for SC16C852LIB,157:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SC16C852LIB,157 Tags
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