Small Household Appliance LED Panel HT48R008 Characteristics STD OTP MCU with LED Driver 7-segment display, LED matrix with adjustable brightness Internal LED driver can directly drive four 7-segment displays, 32 LEDs and scan 16 keys Can directly drive LEDs without external transistors Can use UART interface to transmit data to 7-segment displays, LEDs and keys LED Display UART LED Matrix Switch UART USB Power HT48R008 Application Areas Consumer Products, Home Appliances, Industrial Control, Health Care Products etc… Block Diagram Application Circuit MCU (HT48R008) COM3 COM2 USB Power U1 SEG7 SEG6 SEG5 SEG4 TX 1 COM1 COM3 COM2 COM1 COM0 D4 2 SEG0 1 2 D3 1 2 D2 1 1 2 D1 1 1 1 COM0 LED Matrix 1 2 3 4 5 6 7 8 9 10 11 12 13 14 PB7 PB3 PB6 PB2 PB5 PB1 PB4 PB0 PD0 PD3 PD1 PD2 PA4/TX PA5/RX PC5/SCL PA6/PFD PC4/SDA PA7/RESB PC3 VDD PC2 VSS PC1 PA0/TMR1 PC0 PA1/TMR0 PA3 PA2/INT 28 27 26 25 24 23 22 21 20 19 18 17 16 15 Power VDD USBUSB+ VSS Shield SEG3 SEG2 SEG1 SEG0 1 2 3 4 5 VDD RX VDD VDD KEY0 KEY1 C1 0.1uF HT48R008 2 1 2 JP2 2 SEG4 1 2 SEG5 1 D28 2 SEG6 1 1 2 1 1 2 1 2 1 2 SEG7 1 2 1 1 2 2 SEG1 1 2 2 SEG2 7 Segment Display (Common Cathode) 1 2 2 SEG3 DIS1 7 2 1 1 2 2 SEG4 2 1 1 2 2 SEG5 F2 2 1 1 2 2 SEG6 F4 2 1 1 2 A F L4 F3 1 1 2 5 2 1 2 3 4 2 SEG0 3 F1 D32 2 D31 2 2 2 D30 1 L3 1 D29 2 6 1 2 D27 1 2 1 1 2 D26 1 2 1 2 1 4 1 D25 1 2 RX TX L2 1 2 D24 1 2 D23 1 2 1 1 2 D22 2 0 1 D21 1 2 12COM0 9 COM1 8 COM2 6 COM3 D20 1 2 D19 1 2 1 1 2 D18 2 SEG7 E G D B C E D DP C G B F A 2 L1 1 D17 VDD VDD TX RX SEG0 1 SEG1 2 SEG2 3 SEG3 4 SEG4 5 SEG5 7 SEG6 10 SEG7 11 1 2 SEG3 2 D16 JP1 1 2 3 4 COM1 COM2 COM3 COM4 Switch 1 2 SEG2 1 2 2 D15 1 2 1 2 1 UART D12 KEY1 D14 SEG1 KEY0 D13 D8 D11 1 2 D10 1 1 2 D9 D7 1 2 D6 1 1 2 D5