< schematic diagram of oral arithmetic exercise machine program development> oral arithmetic exercise machine / oral arithmetic treasure / children's math treasure / children's calculator LCD LCD driv

Oral arithmetic practice machine Adopt microcomputer control technology , Large LCD , Elegant design , Easy to use , The machine automatically sets questions , Judge the question and broadcast it by voice . Students choose by pressing the key 6 Kind of question bank and input operation results .

Oral arithmetic practice machine Applicable to the connection between young and young , Students in the lower grades of primary school use , The exercise content includes single digit addition and subtraction 、 Single digit plus minus ratio size 、 Two digit addition and subtraction 、 The size of the two digit plus minus ratio 、 Multiplication formula 、 2 The multiplication and division ratio within digits is a total of 6 Big questions ,400 ten thousand ＋ Question bank , Let children easily complete oral arithmetic exercises and mathematical logical thinking training .

The following is a Oral arithmetic practice machine / Math treasure, etc LCD Display drive VK1621B brief introduction

Product brand ： Yongjia micro electricity /VINKA
Product model ：VK1621
Package form ：LQFP44/48、SSOP48、SDIP28、DICE Naked piece

summary ：
VK1621 Is a dot matrix storage mapping LCD Driver , Can support the most 128 spot （32SEGx4COM） Of LCD screen , Also support 2COM and 3COM Of LCD screen . Single chip microcomputer can pass 3/4 The communication pins are configured to display parameters and send display Display data , You can also enter the power saving mode through the command .

characteristic ：
• Working voltage 2.4-5.2V
• built-in 256 kHz RC oscillator （ Power on default ）
• It can be connected externally 32.768kHz Crystal oscillator （OSCO,OSCI）
• It can be connected externally 256kHz Clock source （OSCI）
• Bias voltage （BIAS） It can be configured as 1/2、1/3
• COM cycle （DUTY） It can be configured as 1/2、1/3、1/4
• Built in display RAM by 32x4 position
• The buzzer frequency can be configured to 2kHz、4kHz
• Power saving mode （ Enter... By turning off the display and turning off the oscillator ）
• Time base and watchdog share 1 A clock source , Configurable 8 Two frequencies
• The output pin of time base or watchdog overflow signal is /IRQ foot ( Open a leak )
• 3/4 Line serial interface
• software configuration LCD Display parameters
• Write commands and read and write data 2 Command formats
• The read-write display data address is automatically added 1
• 3 A way to access display data
• VLCD Feet provide LCD Drive voltage （<VDD）
• encapsulation ：
SSOP48(300mil)(15.9mm x 7.5mm PP=0.635mm)
LQFP48(7.0mm x 7.0mm PP=0.5mm)
LQFP44(10.0mm x 10.0mm PP=0.8mm)
SDIP28(288mil)(35.3mm x 7.3mm PP=2.54mm)
DICE Naked piece

The following figure for Oral arithmetic practice machine Ready made solutions Schematic diagram （ Available solutions / Technical support ）