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CC stepper motor driver IC does not need external sense resistor

Fri, Oct 15, 2021

Stepping motor driver ICs from Toshiba Electronics Europe now include the B67S539FTG. Housed in a 5.0 x 5.0mm QFN32 package, it operates without an external sense resistor and is integrated in the Stepper 17 Click board from Mikroe.

The TB67S539FTG is intended for a range of constant current (CC) control stepper motor applications including those found in office automation, commercial and industrial equipment. It can also be used in surveillance cameras and projectors.

The IC is based on Toshiba’s latest BiCD process and can drive bipolar stepping motors up to 40V and up to 2.0A. The integrated H-bridge circuit for motor control uses an Nch/Nch configuration and has a built-in charge pump circuit for output stage control.

The current detector is integrated within the QFN32 package, removing the need for an external current sense resistor. A capacitor for the charge pump is also integrated. The level of integration reduces the required PCB space significantly, says Toshiba.

The output stage (covering the upper and lower transistor) has an RDS(on) of just 0.8 Ohm. This ensures efficient operation and reduces heat generation during use. In sleep mode, the device draws a maximum current of 1.0 microA.

The IC is in mass production and shipping now. The compact Stepper 17 Click add-on board, created in partnership with Mikroe, is supported by a mikroSDK-compliant library.

Toshiba Electronics Europe is the European electronic components business of Toshiba Electronic Devices and Storage. TEE offers European consumers and businesses a variety of innovative hard disk drive (HDD) products and semiconductors for automotive, industrial, IoT, motion control, telecomms, networking, consumer and white goods applications. The company’s portfolio encompasses power semiconductors and other discrete devices ranging from diodes to logic ICs, optical semiconductors as well as microcontrollers and application specific standard products (ASSPs).

TEE has headquarters in Düsseldorf, Germany, with branch offices in France, Italy, Spain, Sweden and the United Kingdom providing marketing, sales and logistics services.

http://www.toshiba.semicon-storage.com

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Renesas bases RA2E2 microcontroller family on Arm Cortex-M23 core

Thu, Oct 14, 2021

For small and energy-sensitive IoT, wearable, medical, industrial automation, consumer and home appliance applications, Renesas offers the RA2E2 microcontroller group. It is based on the Arm Coretex-M23 core and is the latest addition to the 32-bit RA family.

The family of microcontrollers is claimed to offers a combination of low power consumption, a set of peripherals targeted at IoT endpoint applications and space-saving packaging options including a tiny 16-pin WLCSP (wafer level chip scale package) measuring only 1.87 x 1.84mm. The 48MHz RA2E2 family is claimed to offer the industry’s lowest operating power in their class, consuming only 81microA/MHz in active mode with software standby current of only 200nA with fast wake up. They also support a wide temperature range of Ta = -40/+125 degrees C for harsh IoT operating environments. The RA2E2 microcontrollers support an I3C bus interface and integrate cost-saving peripheral functions, including an on-chip oscillator with precision of +/- one per cent, power on reset, low voltage detector, EEPROM and a temperature sensor.

The RA2E2 Group includes nine devices, spanning from 16- to 24-pin packages, and from 16 to 64kbyte of flash memory and 8kbyte of SRAM. The devices also include 2kbyte of data flash memory, which is atypical in low-pin count devices, says Renesas. They are also claimed to be the only microcontrollers in their class to offer an I3C bus interface, delivering high-speed communications of 4.6Mbits per second while significantly reducing power consumption. Security features include a cryptography accelerator (AES256/128), a true random number generator (TRNG) and memory protection units.

The RA2E2 group is available today. Renesas is also offering the EK-RA2E2 evaluation kit.

The Renesas RA family includes over 160 parts ranging from 48 to 200MHz. They have a wide range of communications and security options, including Arm TrustZone technology. All RA devices are supported by the Renesas Flexible Software Program (FSP) that includes drivers and middleware to ease the implementation of communications and security. The FSP’s graphical user interface (GUI) simplifies and accelerates the development process, says Renesas. It enables flexible use of legacy code as well as easy compatibility and scalability with other RA devices. Designers using FSP also have access to the Arm ecosystem and tools as well as Renesas’ partner network.

http://www.renesas.com

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Dual MOSFETs use precision process for low on resistance

Thu, Oct 14, 2021

Dual MOSFETs for driving motors in base stations (cooling fans) and industrial applications such as factory automation equipment, including robots, requiring 24V input are available from Rohm Semiconductor.

MOSFETs are increasingly required to ensure sufficient margin against voltage fluctuations by providing 40V and 60V withstand voltages to support 24V input required for motors used in industrial equipment and base stations. They are expected to deliver higher speed switching with lower on resistance to improve the efficiency and miniaturisation of motors.

Rohm’s sixth generation 40V/60V MOSFETs use precision processes for the Nch MOSFETs. The QH8Mx5/SH8Mx5 series has dual-MOSFET products (Nch+Pch) featuring ±40V/±60V withstand voltages. According to Rohm, this combination results in dual Nch+Pch MOSFETs that deliver the ±40V/±60V withstand voltage required for 24V input. The company has also developed the +40V/+60V QH8Kxx/SH8Kxx (Nch+Nch) series to support a wider range of needs. There are 12 models in total, made up of Nch+Pch and Nch+Nch devices.

The QH8Mx5/SH8Mx5 series achieves on resistance that is 61 per cent lower than the Pch MOSFETs in dual MOSFETs products in the ±40V class. This contributes to significantly lower power consumption in a variety of applications. Integrating two devices into a single package reduces mounting area and decreases the workload required for component selection (combining Nch and Pch), reports Rohm.

Rohm Semiconductor develops and manufactures a wide product range from SiC diodes and MOSFETs, analogue ICs such as gate drivers and power management ICs to power transistors and diodes to passive components.

The company has manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, and China. Lapis Technology (former OKI Semiconductor), SiCrystal GmbH and Kionix are companies of the Rohm Semiconductor Group.

Rohm Semiconductor Europe has its head office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa).

http://www.rohm.com/eu

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Timing grandmaster protects critical infrastructure networks

Thu, Oct 14, 2021

Enhancements to Microchip’s timing grandmaster improve deployment flexibility, security and scalability, says the company. Designed for infrastructure communication networks which acquire and maintain signals for precise timing from GPS (global positioning system) or other worldwide satellite constellations require redundant backup systems when GNSS (global navigation satellite system) signals are unavailable. The TimeProvider 4100 Release 2.3 precision timing grandmaster meets this requirement, says Microchip, with the latest IEEE 1588 v2.1 2019 security standard, and also provides an increased level of deployment flexibility and scalability.

Microchip’s TimeProvider 4100 Release 2.3 grandmaster introduces a resilient multi-client precision time protocol (PTP) optional license, providing customers with up to three connections to other grandmasters in the operator’s network. This capability can be used as a back up for time and phase input. This implements the IEEE 1588 2.1 standard majority vote mechanism to select the best input for assisted partial timing support (APTS) back up protection.

The grandmaster also provides support for two PTP server profiles on every Ethernet port. Customers can optimise usage of these ports without additional hardware investments, adds Microchip. TimeProvider Release 2.3 also allows PTP server, PTP client and in-band management to be used on a single port.

The increased security includes support for IEEE 1588 2.1 2019 standard, and for architecture guidance security, which uses redundant communication paths between PTP nodes to detect tampering. It also implements out-of-band management mechanisms for detecting tampering, degradation and failures. There is also support for authentication, authorisation and accounting as well as two-factor authentication.

PTP enhancements including increased capacity of up to 1,000 network clients, which is required for certain applications such as data centres. There are also enhancements to the E1/T1 expansion module with new signals such as composite clock and JCC (Japan CC format), both inputs and outputs, for increased integration with legacy systems.

The software update, TimeProvider 4100 Release 2.3 is available for new and already-deployed systems. Other features include:

TimeProvider 4100 Release 2.3 can be managed by Microchip’s TimePictra synchronisation management system for full fault, configuration, accounting, performance and security (FCAPS).

http://www.microchip.com

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CC stepper motor driver IC does not need external sense resistor

Renesas bases RA2E2 microcontroller family on Arm Cortex-M23 core

Dual MOSFETs use precision process for low on resistance

Timing grandmaster protects critical infrastructure networks

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