Tesla sales are keeping electric car market in California alive

California is the biggest electric car market in the US by far, but it is kept alive by Tesla’s sales, especially the Model 3, as shown by registration data. more…


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ecobee’s Smart Light Switch cuts energy use and acts as a sensor for $45, more

Amazon offers the ecobee Switch+ HomeKit-enabled Light Switch for $ 45.28 shipped. As a comparison, it typically goes for $ 80 at retailers like Best Buy and elsewhere. Today’s deal is a match of our previous mention. ecobee’s smart Switch+ works with a variety of voice assistant platforms, including HomeKit and Alexa. With automatic scheduling, you’ll be able to cut down on energy usage. It can also serve as a sensor in some smart homes, letting you automatically control temperatures and lights based on occupancy. Rated 4.3/5 stars. More Green Deals below.

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Tesla is showing interest in battery factory project in India, report says

Tesla has yet to enter the Indian market, but now a new local media report suggests that Tesla is showing interest in a battery factory project in the country. more…


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Renesas’s new battery management IC maximizes range for hybrids and EVs

Japanese semiconductor manufacturer Renesas Electronics has announced its fourth-generation Li-ion battery management integrated circuit (IC). The company says its new ISL78714 IC provides accurate cell voltage and temperature monitoring, cell balancing, and extensive system diagnostics to protect 14-cell Li-ion battery packs, all while maximizing drive time and range for hybrid and electric vehicles.

The ISL78714 monitors and balances up to 14 series-connected cells with ±2mV accuracy across automotive temperature ranges. It includes a precision 14-bit analog-to-digital converter and associated data acquisition circuitry. The device also offers up to six external temperature inputs and includes fault detection and diagnostics for all key internal functions.

The device meets reliability and performance requirements of battery pack systems for all EV variants, including hybrids and plug-in hybrids, with safety features enabling automotive manufacturers to achieve the ISO 26262 automotive safety integrity level (ASIL D). The IC monitors and reads back over/under voltage, temperature, open wire conditions, and fault status for 112 cells in less than 10 milliseconds.

Multiple ISL78714 units can be connected together via a proprietary daisy chain that supports systems up to 420 cells (30 ICs). The ISL78714’s daisy-chain architecture uses low-cost capacitive or transformer isolation, or a combination of both, with twisted-pair wiring to stack multiple battery packs together while protecting against hot plug and high-voltage transients. A watchdog timer automatically shuts down a daisy-chained IC if communication with the master MCU is lost .

The device features a fully differential cell input range of ±5V that accommodates fuel cell and bus bar measurement requirements for aging battery packs and a 15-year board level accuracy (long term drift) of ±6 mV @ ±6σ.

Renesas Senior Director Niall Lyne said, “The ISL78714 battery management IC enables battery management systems with a best-in-class combination of battery pack monitoring accuracy, fast data acquisition, and fault checking features.”

Source: Renesas

Charged EVs

Tesla is updating its wiring system for redundancy in self-driving

Tesla has been working on updating its wiring system with a new ‘high speed’ architecture that includes more redundancy, which the automaker believes is going to be useful with the advent of self-driving. more…


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