'Tough' MCUs Optimized for Rechargeable NiMH Applications

Class-leading low voltage drive contributes to greater energy efficiency and performance in compact battery-driven industrial equipment

LAPIS Semiconductor ML620130 family

Willich-Münchheide, August 25, 2016 – LAPIS Semiconductor, a member of the ROHM group, has announced the development of the ML620130 family of 16bit low power MCUs, optimized for compact industrial equipment requiring battery drive in noisy environments, featuring superior processing capability with low power consumption.

In addition to clearing the ±30kV noise measurement limit, operating voltage has been successfully reduced to 1.6V. Optimizing the operating voltage to an integral multiple of standard nickel metal hydride batteries (NiMH, 0.8V× 2=1.6V) ensures efficient use without wasting battery charge. This contributes to decreased battery consumption, prolonging battery life in portables and battery-equipped industrial equipment. The ML620130 family consists of 9 models offered in a variety of memory capacities, pin counts, and other characteristics that make it possible for users to select the ideal solution to fit set needs.

In recent years, the continued miniaturization of sensors, batteries, and power supplies has increased the demand for compact, low-cost modules (embedded substrates) that support a variety of applications and operating conditions. When considering different situations and usage methods there is a need to ensure stable operation under harsh environments (i.e. excessive noise, heat generation) while at the same time requiring improved performance such as greater communication diversification and generalization.

To provide increased miniaturization and lower costs, many applications are opting to eliminate noise and/or thermal countermeasures. However, this makes it difficult to balance the conflicting demands for increased environmental resistance while maintaining safety utilizing fewer external parts. In addition, reducing the size of the battery mounted in the module while also increasing battery life requires that the power consumption (voltage and current) be optimized for each application.

To meet these disparate needs, LAPIS Semiconductor has expanded its lineup of market-proven 16bit low power microcontrollers to include the ML620130 family of ‘tough‘ MCUs that incorporate multiple functions optimized for battery drive operation.

LAPIS Semiconductor MCU Lineup

Key Features

1. Optimized for ultra-low-voltage rechargeable nickel metal hydride batteries
The minimum operating voltage has been decreased, from the conventional 1.8V to 1.6V. This extends the supply voltage detection range down to 1.63V (typ.) – very close to the voltage of 2 nickel metal hydride batteries (0.8V×2=1.6V) – reducing the number of charge cycles and memory effects while prolonging battery life.

Optimized for ultra-low-voltage rechargeable nickle metal hydride batteries
 
 

2. Improves basic performance and reduces current consumption
16MHz CPU and 32MHz (PWM) peripheral clock operations increase performance by 2-fold over LAPIS standard lineup of ‘tough' MCUs, while operating current is reduced by more than 25%*.
*Compared to typical published values

Rechargeable nickel-metal hydride batteries are susceptible to the ‘battery effect', which causes the batteries to ‘remember' a smaller capacity if repeatedly recharged after only being partially discharged, losing their original energy capacity. This may lead to a steep voltage drop once the smaller capacity is reached, abruptly halting operation and requiring premature recharge. However, this effect may be overcome and original battery capacity restored by subjecting the batteries to deep charge/discharge. This phenomenon underscores the importance of correctly utilizing NiMH batteries.

Improves basic performance and reduces current consumption

3. Class-leading high-accuracy on-chip oscillator eliminates the need for an external oscillator

A high-accuracy on-chip RC-type oscillator is built in (±1%@-20°C to ±85°C, ±1.5%@-40°C to +105°C). UART communication (asynchronous method), which has been widely adopted for a variety of uses as an interface for external equipment, is enabled throughout the entire temperature range without an external oscillator, reducing peripheral component costs. In addition, both full-duplex (×1ch) and half-duplex (×2ch) modes are allowed, and in the event that bidirectional communication is not required at the same time the 2 receiving terminals and 2 transmission terminals can be flexibly assigned, making it possible to mount on smaller boards.

 

4. Superior noise immunity

High noise immunity inherited from LAPIS Semiconductor's conventional lineup of low-power MCUs makes it possible to clear the ±30kV Level 4 measurement limit (air discharge: ±15kV) of the IEC61000-4-2 standard (electrostatic immunity testing standard). In addition, implementing circuit enhancements related to power lines and noise intrusion pathways resulted in a 30% improvement in noise resistance (verified via indirect discharge using LAPIS Semiconductor's reference board under specific conditions).

Specifications


Parameter

ML620Q130 Family

Q131

Q132

Q133

Q134

Q135

Q136

CPU

LAPIS Semiconductor Original
16bit RISC Core (nX-U16/100)

Clock

High Speed

Internal RC Oscillator: 16MHz

Low Speed

Internal RC Oscillator: 32.768kHz

Internal

Memory

Program Area

8KB

16KB

24KB

8KB

16KB

24KB

 

Data Area

2KB

SRAM

2KB

Serial I/F

SSIO

1ch

I2C

1ch

SPI

-

UART (Full Duplex)

1ch (or Half Duplex: 2ch)

Analog I/F

10bit SA Type ADC

6ch

8ch

12bit SA Type ADC

-

24bit RC Type ADC

-

Analog Comparator

2ch

General Ports

11ch

15ch

Other Functions

Safety/diagnostic
RAM guard
ADC test
RAM error reset
Clock monitoring

Guaranteed Operating Range

Operating Temp.

-40°C to 105°C

Operating Voltage

1.6V to 5.5V

Package

16pin SSOP
16pin WQFN

20pin TSSOP

 

Applications

Sensor modules, battery charge control, compact electric tools, portables, industrial equipment

 

Availability

The products are available.