summary:
WT0024 is a 256 point memory image and multi-functional LCD driver special chip (TM1622 can be replaced). The software configuration characteristics of WT0024 make it suitable for a variety of LCD applications, including LCD modules and display subsystems. There are only 4 or 5 pins for connecting the main controller and WT0024. WT0024 also has a power saving command to reduce system power consumption. This product has excellent performance and reliable quality. At the same time, in combination with the standard voice chips WT2003H-16S and WT588F02B-16S of Weichuang Company, only UART or IIC serial ports are required to control voice playback and LCD display driver when using, so the operation is simpler and details can be referred to WT2003H 、 WT588F02B Instruction manual of voice chip.
Special function description:
1. Working voltage 2.4~5.2V;
2. Built in 32 KHz RC oscillator;
3. External 32KHz frequency source can be used as clock input;
4. Built in time-frequency source;
5. Built in power saving mode, which can be used to reduce power consumption;
6. Built in time base generator and watchdog (WDT) output;
7. Built in 32 ⅹ 8-bit display register, 32 SEGs, 8 COM output drivers, 1/4 bias;
8. Four wire serial interface;
9. VDDLCD pin is provided to adjust LCD operating voltage;
10. Three data access modes;
11. Eight time bases/watchdog timer clock source;
12. Data mode and command mode instructions;
13. Packaging form: LQFP44 (long leg);
Product selection:
Pin description:
Input and output equivalent circuit:
be careful:
1. The voltage of VDDLCD must be less than or equal to the voltage of VDD.
2. The pull-up adjustable resistance of VDDLCD is used to adjust the control voltage of LCD. When VDD=5.0V, VDDLCD=4.0V, VR=15K ± 20%.
3. If it is not necessary to read the video memory data of WT0024, RCLK can not be connected to MCU.
4. The capacitance of VDD to GND can filter out the ripple generated on the chip VDD, so this capacitance cannot be omitted, and when PCB layout, try to be close to the chip.
5. On chip RC and external clock can be selected as chip clock. If the internal RC oscillation is used, the OSCI pin must remain floating, and the * 32KHz clock must be evacuated, otherwise the chip may not work properly.
6. After the LCD display of WT0024 is turned on, the COM port circularly outputs ladder waves. This feature enables WT0024 to drive LCDs of 2COM, 4COM and 8COM.
If the time base/WDT function is not used, the connection between TICK and MCU can be disconnected. Since TICK is an Nmos open drain output, if the time base/WDT function is used, TICK must be connected with a 10K pull-up resistor, otherwise TICK will not be able to output a high level.
Application scenario:
WT0022 LCD display driver chip It can be applied to household appliances (intelligent water heaters, microwave ovens, washing machines, air conditioners, induction cookers), set-top boxes, electronic scales, smart meters and other digital tubes or LED display devices; The product features low power consumption, easy application and multiple composite functions, which are convenient for users to choose.
