Infineon Technologies S6BT112A02SSBB202

Overview

S6BT112A02SSBB202 from Infineon Technologies (formerly Cypress) is a CXPI transceiver IC for automotive network communication, serving as the physical layer interface between a microcontroller's UART and the CXPI bus. It supports 2.4–20 kbps bit rates, operates from 5.3 V to 18 V, delivers 6 µA typical sleep current in slave mode, and features ±40 V BUS voltage tolerance and AEC-Q100 Grade-1 qualification.

For engineers reviewing the S6BT112A02SSBB202 datasheet, S6BT112A02SSBB202 pinout, S6BT112A02SSBB202 application, or S6BT112A02SSBB202 equivalent, key selection criteria include CXPI compliance (ISO 20794-4:2020 / JASO D015-3:2015), master/slave node configuration via SELMS, direct battery operation with load-dump protection, and low-EMI waveshaping for ECU body electronics.

Technical Context

The S6BT112A02 implements a full CXPI PHY layer with integrated LDO regulator, thermal shutdown, low-voltage detection, and overcurrent protection on the BUS line. Its dual-mode operation-configurable as master or slave via SELMS-dictates CLK pin behavior: input for master timing reference, open-drain output for slave clock distribution.

It supports three operational states: Normal (active TX/RX), Standby (RX enabled, TX disabled), and Sleep (6 µA quiescent, wake-up via BUS activity or NSLP edge). The RC oscillator provides baud-rate timing when external clock is absent, and BUS pin withstands ±40 V transients without latch-up.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (SOIC-8), halogen-free, RoHS-compliant, footprint per Infineon package drawing SSO8-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CXPI transceiver applications.

Compared with NXP TJA1125 and Renesas RAA221000, S6BT112A02SSBB202 offers broader bit rate range (2.4–20 kbps), lowest sleep current (6 µA), and fully integrated LDO - making it optimal for battery-sensitive, space-constrained body ECUs without auxiliary regulators.

Availability

S6BT112A02SSBB202 is available at Aetrix Electronics and suitable for door module control, seat position memory, roof console interface, and interior lighting cluster applications requiring stable component supply across automotive production lifecycles.

Supply support for S6BT112A02SSBB202 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

Infineon Technologies is a German semiconductor leader specializing in power management, automotive ICs, and security solutions, with global manufacturing and R&D infrastructure.

The S6BT112A series belongs to Infineon's automotive connectivity portfolio, designed specifically to replace legacy LIN and low-speed CAN in body electronics with lower-cost, lower-EMI, and higher-diagnostic-capability CXPI networks.

FAQ

What is the function of the NSLP pin?

The NSLP pin is an active-low digital input that controls entry into and exit from Sleep mode. When pulled low, the device enters Sleep mode with 6 µA typical current draw. A rising edge on NSLP (or activity on the BUS line) wakes the device into Standby mode. This pin must be driven by a stable MCU GPIO or passive pull-down resistor; floating is not permitted per datasheet Section 5.2.2.

Does S6BT112A02 support master node operation?

Yes, S6BT112A02 supports master node operation when SELMS is held low. In this configuration, the CLK pin functions as a clock input (not output), accepting an external 2.4–20 kHz signal to define the CXPI bit rate. Unlike S6BT112A01, it lacks the Spread Spectrum Clock Generator, so master timing must be supplied externally - confirmed in datasheet revision *H, Table 3-1 and Section 5.2.

How does the BUS pin handle short-to-battery faults?

The BUS pin includes integrated overcurrent protection that detects short-to-VBAT conditions and disables the driver stage within 1 µs. Recovery occurs automatically after fault removal and a 10 ms debounce period. This feature prevents thermal runaway and maintains bus integrity for other nodes - specified in Electrical Characteristics Table 8-3 and Function Description Section 5.4.3.

Is an external pull-up resistor required on RXD?

Yes, an external pull-up resistor (recommended 4.7 kΩ to 5 V) is mandatory on RXD (Pin 1) because it is an open-drain output. Without it, the MCU UART RX line remains undriven during idle, causing framing errors. The value is validated in Recommended Operating Conditions Table 7-1 and Pin Descriptions Table 3-1 of the official datasheet.