Renesas ISL78714ANZ

Overview

ISL78714ANZ from Renesas Electronics is an automotive-grade Li-ion battery manager IC that supervises up to 14 series-connected cells with ±2 mV voltage measurement accuracy (1.65 V–4.28 V, -20°C to +85°C), AEC-Q100 qualification for ASIL D systems, and robust two-wire daisy-chain communication at up to 1 Mbps-used in EV/HEV battery packs for cell balancing, diagnostics, and thermal monitoring.

For engineers reviewing the ISL78714ANZ datasheet, ISL78714ANZ pinout, ISL78714ANZ application, or ISL78714ANZ equivalent, key selection criteria include its 14-cell monitoring capability, -40°C to +105°C operating range, SPI + daisy-chain interface architecture, integrated watchdog, and RoHS-compliant 64-pin TQFP package.

Technical Context

The ISL78714ANZ implements a distributed BMS architecture where one master device communicates via SPI to a host MCU while up to 29 slaves interconnect via a proprietary two-wire daisy chain using capacitor or transformer isolation. Its protocol complies with ISO 26262 requirements for high-coverage diagnostics.

It supports three balancing modes-Manual, Timed, and Auto-with Auto Balance terminating after a host-specified charge removal per cell. All 14 cell voltages, six external temperature inputs, and internal die temperature are measured with 14-bit resolution and read back in under 10 ms for 112 cells across a stack.

Key Specifications

Pinout & Package

The ISL78714ANZ is housed in a 64-pin TQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad, rated for automotive temperature range (-40°C to +105°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX17853 and BQ79616-Q1, the ISL78714ANZ offers balanced trade-offs: SPI + daisy-chain flexibility, AEC-Q100 ASIL D readiness, and proven thermal performance at +105°C-making it optimal for mid-to-high voltage EV platforms where reliability and diagnostic coverage are prioritized over raw channel count or speed.

Availability

ISL78714ANZ is available at Aetrix Electronics and suitable for EV traction battery packs, HEV energy storage modules, and industrial backup battery systems requiring stable component supply, long-lifecycle assurance, and automotive-grade traceability.

Supply support for ISL78714ANZ 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 Corporation is a global semiconductor leader delivering trusted embedded design innovation, with core expertise in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and enterprise markets.

The ISL78714ANZ belongs to Renesas' ISL78xxx automotive battery management portfolio, engineered specifically for functional safety-compliant, high-accuracy cell supervision in electrified transportation systems-including EVs, PHEVs, and commercial vehicle energy storage.

FAQ

What is the maximum number of ISL78714ANZ devices that can be daisy-chained together?

The ISL78714ANZ supports up to 29 slave devices in a daisy-chain configuration alongside one master device, enabling supervision of up to 420 cells (29 × 14 + 14). This architecture is implemented using Renesas' proprietary two-wire interface with capacitor or transformer isolation, and operates reliably at up to 1 Mbps. The ISL78714ANZ automatically detects its position in the chain, eliminating manual address configuration.

Does the ISL78714ANZ support both passive and active cell balancing?

The ISL78714ANZ supports only passive cell balancing via integrated FETs and external resistors-offering Manual, Timed, and Auto Balance modes. Auto Balance terminates balancing once a host-defined amount of charge is removed from each cell. It does not include active balancing circuitry (e.g., charge shuttling or DC-DC conversion). The ISL78714ANZ relies on external passive components for heat dissipation during balancing.

What is the meaning of "post board assembly device accuracy: ±2.5 mV" for the ISL78714ANZ?

This specification reflects the total measurement error of the ISL78714ANZ after soldering onto a PCB, including effects from layout parasitics, thermal gradients, and component tolerances-measured across 1.65 V–4.28 V and -20°C to +85°C. It is distinct from initial device accuracy (±2 mV), and confirms the ISL78714ANZ maintains high fidelity in real-world automotive assemblies where mechanical stress and thermal cycling occur.

Can the ISL78714ANZ operate without a host microcontroller?

Yes-the ISL78714ANZ can function in stand-alone mode using its internal state machine for basic monitoring and balancing, though full functionality (e.g., Auto Balance configuration, diagnostics reporting, and stack coordination) requires a host MCU via SPI. In stand-alone mode, the ISL78714ANZ still performs voltage/temperature acquisition and executes preconfigured balancing sequences, but cannot upload data or accept dynamic commands.

Is the ISL78714ANZ pin-compatible with earlier ISL78713 or ISL78712 variants?

No-the ISL78714ANZ is not pin-compatible with ISL78713 (13-cell) or ISL78712 (12-cell) variants due to differences in pin assignment for cell inputs (VC0–VC14 vs. VC0–VC12) and internal routing. While all share the same 64-pin TQFP package outline, the ISL78714ANZ allocates additional pins for its 14th cell channel and updated diagnostic signaling. Board redesign is required when migrating between these variants.