Internal functions of TSE2981 integrated circuit The internal function block diagram of TSE2981 integrated circuit is shown in Figure 1. Its working principle is: by charging and discharging the external capacitor (precision capacitor is required) to generate the speed curve (pin 1), the dwell angle curve (pin 22) and the ignition (timing) curve (pin 6) to control the operation of the motorcycle engine. Because its internal circuit functions are complete, it can not only complete the timing curve control, but also ensure that the ignition energy is large enough and basically the same in the entire range from low speed to high speed (4213 has no dwell angle control, and the high-speed ignition energy is insufficient), and has good ignition performance. The igniter assembled with TSE2981 is suitable for high-end high-power motorcycles and small cars. Its working process is: the positive and negative pulses in the PC pulse are sent to pin 19 (the voltage of pin 19 is set to 0.49V by the external resistor) through the network of D1, D2 and R2, C2, R3, C3, and the pulse after Schmidt differential amplification and shaping with pin 20 can be observed at pin 18. The potential of pin 20 is set internally and no external components are required during use. Pin 7 is the internal voltage reference output. When the VCC of pin 21 is 5V, the voltage of pin 7 is 1.5V. This is the working reference of the entire circuit and is also a key part of the IC. The external resistors of pins 2, 4, and 5 set the discharge level of the advance angle curve, the discharge level of the speed curve, and the charging level of V2 (0.35V), V4 (0.45V), and V5 (0.3V) respectively. When the discharge level V4 of the speed curve is clamped at the V2 level, the discharge level V2 of the advance angle curve is also clamped at the V5 level, and the advance angle curve rises to the V5 level when charging.
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