Infineon Technologies CY8C4126LCE-HV403T

Overview

CY8C4126LCE-HV403T from Infineon is a 32-bit Arm® Cortex®-M0+ MCU with integrated high-voltage precision analog subsystem, designed for lead-acid battery monitoring and management in automotive and industrial systems. It features dual 16–20+ bit ΔΣ ADCs (current/voltage/temperature/diagnostic), operates directly from 12-V/24-V battery (up to 42 V), includes integrated LIN 2.2A transceiver, and supports ASIL B hardware metrics per ISO 26262.

For engineers reviewing the CY8C4126LCE-HV403T datasheet, CY8C4126LCE-HV403T pinout, CY8C4126LCE-HV403T application, or CY8C4126LCE-HV403T equivalent, key selection considerations include HV battery input tolerance, dual precision ADC channel architecture, LIN protocol compliance, functional safety certification level, and on-chip ECC-protected memory layout.

Technical Context

The device implements a dedicated high-voltage analog front-end with separate current-sensing path (auto-gain controlled) and voltage-sensing path (HV input divider), both routed to independent ΔΣ ADCs with digital filtering and threshold comparison. Its LIN block supports two channels compliant with LIN 2.2A, 2.1, 2.0, 1.3, SAE J2602, and ISO 17987, while the SCB provides runtime-reconfigurable I²C/SPI/UART/LIN Slave functionality.

Functional safety is implemented via MPU, windowed WDT with challenge-response, supply monitoring for 3.3-V/1.8-V rails, SECDED ECC on SRAM/flash, and redundant analog measurement paths including backup reference voltage. Clock system includes ±2% IMO (up to 49.152 MHz), ±1% HPOSC (2 MHz), and software-calibratable PILO (32 kHz).

Key Specifications

Pinout & Package

Package: 32-pin QFN with wettable flanks (6 mm × 6 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitoring controller applications.

Compared with MAX17853 and TLF35584QVVS1, CY8C4126LCE-HV403T uniquely integrates MCU, dual high-precision ADCs, HV analog front-end, and LIN transceiver in one AEC-Q100-qualified package-reducing component count, enabling autonomous operation, and simplifying ASIL-B compliance for lead-acid battery systems.

Availability

CY8C4126LCE-HV403T is available at Aetrix Electronics and suitable for automotive battery monitoring, industrial UPS management, EV auxiliary power modules, and off-highway equipment BMS requiring stable component supply across extended product lifecycles.

Supply support for CY8C4126LCE-HV403T 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 manufacturer specializing in power management, automotive electronics, and industrial control ICs, with global manufacturing and quality certification aligned to IATF 16949.

CY8C4126LCE-HV403T belongs to the PSoC™ 4 HVPA-144K product line, engineered specifically for high-voltage, safety-critical battery monitoring in automotive and industrial applications where integrated analog precision, functional safety, and LIN connectivity are mandatory.

FAQ

What is the maximum operating voltage on the VBAT pin?

The VBAT pin accepts direct connection to 12-V or 24-V lead-acid batteries and is rated for continuous operation up to 42 V, with absolute maximum rating of 45 V per datasheet Section 4.1. This allows direct battery attachment without external voltage clamping or regulation in typical automotive and industrial battery monitoring use cases.

Does CY8C4126LCE-HV403T support LIN 2.2A master functionality?

No. The integrated LIN block supports only LIN slave mode and LIN transceiver physical layer (PHY) operation. Master functionality must be implemented externally or via the SCB configured in LIN Slave mode with host-controlled frame generation. The MXLIN block provides two independent LIN PHY channels but no built-in master protocol stack.

How is functional safety achieved without external watchdog or memory checker?

Functional safety is implemented internally via a windowed watchdog timer with challenge-response handshake, MPU-enforced memory isolation, SECDED ECC on all SRAM and flash, supply monitors for 3.3-V and 1.8-V rails, and redundant analog measurement paths-including backup reference voltage and duplicated signal chains for voltage, current, and temperature sensing-all verified per ISO 26262-10:2018E.

Can the dual ΔΣ ADCs operate simultaneously with independent sampling rates?

Yes. The two ΔΣ ADCs are fully independent, each with its own sequencer, clock source, and digital filter. They support concurrent acquisition at user-defined rates-e.g., voltage channel at 100 Hz and current channel at 1 kHz-with separate oversampling ratios, decimation filters, and threshold comparators, enabling synchronized yet differentiated battery parameter capture.