Power Lapis hikes MCU clock accuracy for motor control
2013/08/29
The two chips offered are optimised to be built into single-phase fan motors, and it illustrates the need for accuracy with an example where multiple fans (one per MPU) run side-by-side in a server.
“If rotational variations exist between fans, wind noise due to the differences in frequencies will produce a buzzing sound. Fan rotation control via high-accuracy oscillator enables quiet operation,” said the firm.
In this case, it is offering 8.192MHz ±1% operation at (25°C), spreading to +/-2% from -10 to 85°C, and to +/-2.5% (-40 to 85°C). The data sheet describes these as ‘typical maximums and minimums’.
For Hall sensors, it has a hysteresis comparator with reference voltage and differential input switching, and for timing there are six 8bit timers, two of which can be added to make a 16bit timer.
Alongside this to control the motor is a 16.384MHz 16bit PWM with dead time.
This resolution, combined with oscillator accuracy said the firm, allows soft switching which reduces interference: “If the change in current during on/off switching in the motor coil current control is too large, irritating electromagnetic noise can result.”
The core is Lapis’ own risc ‘U8′, with 4kbyte if flash in the ML610Q101, and 6kB in the ML610Q102 variant. Both have 256bytes of RAM.
“The U8 enables efficient command execution of one instruction per clock with parallel processing of future commands by a three layer pipeline,” said Lapis. “Built-in on-chip debug function enables on-board software debugging and rewriting.”
For analogue measurement, there is a six channel 10bit ADC.
Operation is over 30kHz to 8.4MHz, -40 to 85°C, and 2.7 to 5.5V, with SSOP16 and WQFN16 package options, the smallest being 2x2mm.
The internal logic supply regulator does not need an external capacitor, and noise testing is to the +/-30kV level in IEC61000-4-2.
“Carefully designed circuit and layout have enabled high noise immunity, making it possible to clear the ±30kV level, which exceeds the measurement limit of Class 4 [+/-15kV], the highest class defined by the IEC61000-4-2 standard established by the IEC. This makes the LSIs suitable for use in industrial equipment with stringent noise requirements.”
Support includes a ML610Q102 reference board and software development environment. Applications are expected in home appliances, industrial equipment, single-phase fan motors, LED lights, and battery charge controllers.
Samples are available now, with mass SSOP16 production scheduled for September, and the WQFN16 version in October.
Welcome to SUV System Ltd!
SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.
We have built up long term business relationship with about many companies which are stockers and authorized agents. we have a steady and reliable supply to meet customer's demands to the greatest extent .Confidently, we are able to lower your cost and support your business with our years of professional service.
SUV System Ltd is Electronic Components Distributor Supplies,Find Quality Electronic Components Supplies Products IC(Integrated Circuits),Connectors,Capacitor,Resistors,Diodes,Transistors,LED at Suvsystem.com. Sourcing Other Energy, Environment, Excess Inventory Products from Manufacturers and Suppliers at Suvsystem.com
Electronic Components distributor:http://www.suvsystem.com
Connectors Distributor:http://www.suvsystem.com/l/Connectors-1.html
IC Distributor:http://www.suvsystem.com/l/IC(Integrated-Circuits)-1.html
LED Distributor:http://www.suvsystem.com/l/LED-1.html
Capacitor Distributor:http://www.suvsystem.com/l/Capacitor-1.html
Transistor Distributor:http://www.suvsystem.com/l/Transistors-1.html
Resistor Distributor:http://www.suvsystem.com/l/Resistors-1.html
Diode Distributor:http://www.suvsystem.com/l/Diodes-1.html
SUV System Ltd insists on the managing faith ofsincereness,speciality,foresight, win-win,so we build up stable-relationship customers located all over the world, including the States, Europe, Argentina, UAE, Malaysia, Australia,and India etc
we are focus on the following fields,and hope we can help you.
NS IC Fast Recovery Diodes Bipolar Transistors Discrete Semiconductor Transistors ON Diodes TI IC NXP Diodes Resistors Low Ohmic Resistors Kingbrigt LED Current Sensors Resistors Connectors Switching Diodes Vishay resistors LINEAR IC LED part NXP Transistors HARRIS IC IDT IC VISHAY IC Voltage Regulators Transistors Switches Other Parts MOTOROLA IC Texas Instruments(TI) IC IR transistor About US NEC Transistors ST Transistors Metal Can Packages Transistors MURATA IC Industrial IC ROHM Resistors SANYO IC ST Diodes Resistor Networks PANASONIC INFLNEON Diodes Freescale Semiconductor ALTERA IC
http://www.suvsystem.com/a/5368.aspx
