ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

ROHM (headquartered in Kyoto, Japan), a world-renowned semiconductor manufacturer, has developed anti-EMI performance*1 (hereinafter referred to as “anti-interference performance”) for in-vehicle electrical systems that use in-vehicle sensors in harsh environments, such as automotive powertrains and engine control units. ) Excellent ground detection comparators*2 “BA8290xYxxx-C series” (BA82903YF-C / BA82903YFVM-C / BA82901YF-C / BA82901YFV-C).

ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

In the immunity test of the international standard “ISO11452-2”, this product is used as a comparator for judging the threshold value of the sensor output signal, etc., and exhibits extremely excellent anti-interference performance in various noise frequency bands, and the output voltage fluctuation is within ± within 1%. Ordinary products are affected by noise interference, the output voltage fluctuates more than ±20%, and may even malfunction (High / Low reversal), but this product will not be affected by noise interference, so it can reduce the use of various filters in the past. reduce the design burden of noise reduction of the device, help reduce the design man-hours of the system and improve reliability.

Samples of this product have been sold in February 2019 (sample price 500 yen/piece, excluding tax), and it is planned to start mass production in October 2019 with a monthly output of 1 million pieces. The production base for the pre-process is ROHM Wako Co., Ltd. (Okayama, Japan), and the production base for the post-process is ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand).

This comparator series will be supplied as one of the “EMARMOUR series” that achieves extremely excellent noise immunity, together with the operational amplifier*2 series that ROHM introduced in 2017 with excellent EMI resistance. In the future, ROHM will apply technology with excellent anti-interference performance to products such as power ICs, contributing to further simplifying the design of in-vehicle systems and improving their reliability.

In recent years, as the Electronic and high-density in-vehicle electrical systems used in electric vehicles and ADAS (advanced driver assistance systems) have been accelerated, the noise environment has become increasingly severe. Usually, in the development of automobiles, it is difficult to evaluate the noise of the circuit board and the single system. Generally, the evaluation needs to be carried out after assembly. However, once the evaluation result is NG, it needs to be modified on a large scale, so the noise design has always been a big problem.

In response to this issue, ROHM launched an operational amplifier with excellent noise immunity and reduced noise design burden in 2017, which was highly praised in the automotive market. This time, in order to meet the strong demand of the market, ROHM has developed a comparator with excellent anti-EMI performance using its own technology.

ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

<What is “EMARMOUR”? >

“EMARMOUR” is the brand name of ROHM products. This brand product is developed by integrating ROHM’s advantages of “circuit design technology”, “layout technology” and “process technology”, and has passed the international immunity evaluation test of ISO11452-2. , to achieve anti-interference performance with output voltage fluctuation within ±3% in various noise frequency bands. Because of its excellent anti-interference performance, it helps to solve the problem of noise interference in the development process of in-vehicle electrical systems, thereby reducing design man-hours and improving reliability.

ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

<New product features>

1. Excellent anti-interference performance, helping to reduce design man-hours

In various noise frequency bands, the output voltage of ordinary products fluctuates more than ±20%, and may even malfunction (High/Low reversal). The voltage fluctuation is only within ±1%, and no malfunction occurs. Therefore, it is possible to reduce the noise design burden of the in-vehicle sensor which plays an important role in the in-vehicle electrical system, thereby contributing to reduction of system design man-hours and improvement of reliability.

2. Reduced number of parts for noise reduction

Because of the excellent anti-interference performance of this series of products, external noise reduction components (three CR filters for power supply, input and output) that are essential for ordinary products can be reduced. Taking the four-channel comparator as an example, compared with ordinary products, a total of 28 noise reduction components can be reduced.

ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

3. Meet the requirements of the global automotive field (AEC-Q100)

“BA8290xYxxx-C series” not only meet the global automotive electronic product reliability standard AEC-Q100, but also, compared with ordinary products, the current consumption is only 0.6mA (ordinary products are 0.8mA), and the offset voltage is only ±5mV (common products are ±7mV). In addition, the products feature standard comparator pinouts, common surface mount packages and channel counts, making it easy to replace existing products that may have noise issues.

<Lineup of “EMARMOUR series” with excellent anti-interference performance>

ROHM Develops Comparator “BA8290xYxxx-C Series” with Excellent Anti-jamming Performance

Inverter for EV/HEV Engine Control Unit Automatic Transmission

■Electric power steering system ■Lights ■Combination switch

■EV charger ■Car navigation ■Car air conditioner

Various in-vehicle electrical systems that require high noise reduction in electronic circuits.

<Explanation of terminology>

*1) Anti-EMI (Electromagnetic Interference: Electromagnetic Interference) performance

The EMI resistance performance is an index indicating the tolerance to noise interference generated in the surroundings. If the anti-EMI performance is poor, components or systems may malfunction when there is noise interference around, so filters (capacitors, resistors, etc.) and shielding (metal plates) are required to reduce noise. On the contrary, if the anti-EMI performance is excellent, there is no need to worry about the influence of noise interference, which has a very obvious advantage in reducing design man-hours for noise.

*2) Operational amplifier and comparator

Operational amplifier, referred to as “op amp”, can amplify the input signal. By amplifying tiny signals, such as sensor output signals, to a voltage level that can be recognized by microcontrollers, etc.

The comparator is used to determine the threshold value of the input signal. It can judge the threshold value of the output signal of the sensor, etc., and can output digital (High/Low) signal.

Author: Yoyokuo