Toshiba's New Single-Chip Low Pin-Count MCU Realizes Multiple Motor Control

TOKYO — (BUSINESS WIRE) — September 19, 2016Toshiba Corporation's (TOKYO:6502) Storage & Electronic Devices Solutions Company today announced that it has developed a new group of microcontrollers, "M4K group" that allow a single-chip with a low pin-count (32 to 64 pins) to control multiple motors. The MK4 group is the second offering in Toshiba’s TXZ™ family of high-speed, low power consumption microcontrollers that incorporate the ARM® Cortex®-M core, and sample shipments of 13 products will start in October.

As energy saving regulations are gradually tightened and products continue to be miniaturized, demand is increasing for microcontrollers (MCUs) with low pin-count that can efficiently control multiple motors.

The new products meet requirements for the motor control systems of home appliances, such as air-conditioners, and are based on the ARM® Cortex®-M4F, which incorporates a floating point processing unit. Integrated features include a high-precision AD convertor with a 0.5 μs conversion speed, high-speed Flash memory with 80 MHz operation, and a co-processor for Toshiba’s original vector engine. Together, they ensure the new products realize efficient motor control while improving the power factor and system control.

The new products support the RAMScope interface, which can confirm parameters in real time without stopping motors, by loading parameters relevant to motor control to RAM. A self-diagnostic function that confirms the reference voltage of the AD convertor, and a CRC arithmetic circuit that detects incorrect detection for every read operation of the memory are also incorporated and contribute to load mitigation of the software process required for functional safety[1].

• Applications

Appliances with a motor control system
Air-conditioners, washing machines, refrigerators, ventilation fans, ceiling fans, electric bicycles, etc.
 

• Main Features of New Products

(1)   Two motors can be controlled with a 64-pin package.
Until now, driving two motors required a product[2] with a 100-pin type package. Now, the TXZ family products with 64-pin type package can control two motors, because the AD convertor for detecting motor positions is accelerated and a 0.5 μs conversion speed is realized.
 
(2) Providing solutions for driving motors more simply
Driving motors can be easily realized by providing solutions such as sample software using built-in hardware resources (the advanced vector engine plus (A-VE+), a high-speed AD convertor, and an advanced programmable motor control circuit (A-PMD)) for realizing the vector control and the power supply control.
 
(3) The package line-up supports reductions in the size of circuit boards used for products such as home appliances.
Provide various line-ups of low pin-count (32 pins to 64 pins) and small Flash memory (64 KB to 128 KB) products.
Products with a wide pitch for flow mounting and a fine pitch for reflow mounting are included in the line-up.
 

• Outlines and Specifications of New Products

Series Name / Product Group   “TXZ4” Series / “M4K” Group
CPU core ARM ® Cortex ® -M4F
Maximum Operating Frequency 80 MHz
Internal Oscillator 10 MHz (±1%)
Internal Memory  

Flash (code)

64K to 128KB
Flash (data) -
  RAM 18K to 26KB
with parity bits
I/O Port 24 to 52
CRC Arithmetic Circuit (CRC) 1 channel
Communication UART 2 to 4 channels
TSPI 1 to 4 channels
  I2C 0 to 1 channels
12-bit AD Convertor (ADC) Input Channel 8 to 13 channels
 

Conversion
Time

0.5μs
Operational Amplifier 3 channels (gain selection available)

Advanced Programmable Motor Control
Circuit (A-PMD)

2 channels
- 3-phase complementation output: Resolution: 12.5ns, Duty = 15 bits
- PFC Control: 3-phase interleave PFC supported
- Scram function by an external input

Advanced Vector Engine Plus (A-VE+)

1 channel
- Co-processor for a vector control operation, coordinated operation with ADC/A-PMD
- Expansion control of 1 shunt current detection area
- Dead time compensation control, no-interactive control

Advanced Encoder Input Circuit (A-ENC) 1 channel
Timer 32 bit: 6 channels
16-bit timer × 2 channels: 12 channels
Watchdog Timer (WDT) 1 channel
Operating Temperature Range -40 to +105℃
Operating Voltage Range 4.5 to 5.5V
Number of pins   32 to 64 pins
 

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