The ISL78714 offers voltage and temperature monitoring and meets vital worldwide security standards.
This week, Renesas announced the ISL78714, a 14-cell battery administration IC for vehicular lithium-ion batteries, typically known as Li-ion batteries or LiBs. It’s designed to maximise the helpful lifetime of battery cells and to increase the driving time and vary of EVs and hybrids.
The ISL78714 14-cell battery administration chip. Picture from Renesas
Of significant curiosity to designers, the chip’s security options allow producers to realize ASIL D (automotive security integrity degree). That is probably the most stringent degree specified inside ISO26262 of the ISO (International Standards Organization).
The IC can supervise as much as the 14 series-connected cells typical in automotive battery packs and offers vital cell temperature and voltage administration, cell balancing and full system diagnostics.
“The ISL78714 battery administration IC allows battery administration programs with a best-in-class mixture of battery pack monitoring accuracy, quick knowledge acquisition, and fault checking options,” stated Niall Lyne, Senior Director of Product Advertising and marketing and Purposes, Automotive Combined-Sign/Energy and Video, Renesas Electronics Company. “Our Formulation E expertise partnership with Mahindra Racing is already serving to them win on the race monitor. Collectively, we designed and built-in a low-voltage Li-ion battery administration system that includes ISL78714 ICs and RH850 microcontrollers in Mahindra Racing electrical race vehicles.”
Certainly, the RH850 MCU pairs nicely with the ISL7814. The RH850 was simply adopted by Nissan for its Propilot2 driver help system.
Specs and Utility Particulars
The ISL78714 IC offers cell voltage monitoring for as much as 14 series-connected cells at ±2mV accuracy throughout its working temperature vary. It additionally performs very important cell balancing, offers system diagnostics and in addition offers cell temperature monitoring.
As much as 29 extra ISL78714’s may be accommodated by way of a proprietary, two-wire daisy chain. On this method, a complete of 30 ICs can assist as much as 420 (30 occasions 14) cells. This versatile daisy-chain association may be established with capacitor or transformer isolation, or by way of a mix of each. Together with twisted pair wiring, safety towards scorching plug and excessive voltage transients is established.
A grasp ISL78714 communicates to its host MCU (Microcontroller Unit) via an SPI (Serial Peripheral Interface.) Communications at charges as much as 1 Mbps are doable. A daisy-chained IC is robotically shut down if it loses communications with the MCU.
The ISL78714 is AEC-Q100 Grade-2 certified for operation over a temperature vary of -40ºC to +105ºC. The IC is packaged in a 64 pin TQFP.
Renesas additionally affords other products that assist designers management and monitor advanced energy programs based mostly on Li-ion batteries.
Reference Design Out there
Renesas affords the ISL78714BMS5XBEKIT1Z reference design package. With it, designers can discover the mix of the Renesas RH850 MCU with the ISL7814 because the nexus of a battery administration system (BMS) answer.
The ISL78714BMS5XBEKIT1Z. Picture from Renesas
Across the Business
For EVs, hybrids, and every little thing in between, Li-ion batteries are the central however most tough and contentious a part of the brand new automotive universe. Not surprisingly, Renesas shouldn’t be alone in offering varied sorts of administration chips for these highly effective however quirky electrical storage units.
Texas Instruments offers the BQ79606A-Q1, which may monitor as much as six battery cells and is stackable for as much as 64 cells. Communication is by way of a UART interface. Since security is the prime concern in any software associated to Li-ion batteries, it must be talked about that the system is AEQ-Q100-2 certified for system temperatures of –40°C to +105°C.
Maxim Built-in’s MAX17843 is a 12-cell voltage measurement IC that focuses on 48-volt car battery modules. It permits designers to satisfy ASIL D necessities. The corporate additionally affords an educational video describing its tackle automotive battery administration.
Have you ever labored with battery administration programs within the automotive area? Share your insights within the feedback beneath.