China UDEL Chips Tech Co., Ltd. Company Cases

Driven by the wave of digitization, electronic devices and embedded systems have become an important part of our daily lives. Whether it's smart homes, industrial automation, or consumer electronics, efficient and stable data storage chips are indispensable behind them. Today, let's explore together a cornerstone that quietly cultivates in the electronic world - the 24C02 EEPROM chip, and see how it helps our smart life become more colorful. 24C02 EEPROM chip: the hero behind smart life The 24C02 EEPROM chip, as a storage chip, occupies a pivotal position in electronic design and embedded systems due to its non-volatile, large capacity, low power consumption, and high reliability characteristics. It is like a behind the scenes hero, silently providing stable and reliable data support for our intelligent life. Non volatile storage: data is not lost Unlike RAM, the 24C02 EEPROM chip has non-volatile storage characteristics. This means that even if the device loses power, the data stored in it will not be lost. This feature makes 24C02 an ideal choice for storing configuration information, setting parameters, and other data that require long-term preservation. Whether it's personalized settings for smart home devices or operational parameters for industrial automation equipment, long-term stable storage can be easily achieved through the 24C02 EEPROM chip. I ² C bus interface: simplifying design and improving efficiency The 24C02 EEPROM chip uses an I ² C bus interface for communication, which greatly simplifies circuit design and saves system resources. Meanwhile, the I ² C bus has advantages such as high speed and low power consumption, making it easy for 24C02 to meet various data transmission needs. Both in terms of data transmission speed and data transmission quality, 24C02 can provide outstanding performance. Large capacity storage: meeting various needs The 24C02 EEPROM chip provides 2KB of storage space, which is sufficient for most applications. Whether storing simple configuration information or c

01 Design requirements for flashlights 1、 Battery: 4 18650s in parallel, with a voltage of 2.6-4.2V. 2、 Lamp beads: 3 3A lamp beads in parallel, shared by VF3.3V/VF10V. 3、 Circuit architecture: Built in charging detection Chip TP4056, microcontroller dimming, LTC3785 chip boost/expand current, microcontroller output PWM signal controls MOS transistor duty cycle dimming. 4、 Function 1. Battery level display, using dual color LED lights. When charging, the red light is on, and when fully charged at 4.2V, the green light is on. When discharging, the red light flashes slowly (about 800MS) when the battery voltage is 3.6V, and the red light flashes rapidly (100ms) when the battery voltage is 3V. 2. Dimming: Use a single key to select high brightness 100/medium brightness 50/low brightness 30/SOS/flash/off/long press infinite dimming downwards, and another key to define infinite dimming upwards. 3. SOS definition: As shown in the figure below, I drew it based on the waveform of the oscilloscope. To understand, connect the two lines, flash three times, stop 2500mS, flash three times, stop 800mS, and then flash slowly three times. Repeat this process. Flash time: on 300mS/off 300mS, slow flash time: off 800ms/on 800ms. 02 Circuit characteristics Flashlight source file screenshot 03 Introduction to Charging Chip TP4056 Introduction to Charging Chip TP4056 TP4056 is a complete single cell lithium-ion battery that uses a constant current/constant voltage linear charger. The SOP8 package with heat sinks at the bottom and fewer external components make the TP4056 an ideal choice for portable applications. TP4056 is suitable for working with USB power supplies and adapter power supplies. Due to the use of internal PMOSFET architecture and anti reverse charging circuit, there is no need for external isolation diodes. Thermal feedback can automatically adjust the charging current to limit the chip temperature under high-power operation or high ambient temperature conditions Chip features ·4.2V preset charging voltage with an accuracy of ± 1.5% ·Charging current monitor output for battery level detection ·Automatic Recharge ·Charging status dual output, no battery, and fault status display ·C/7 C/10 charging terminated ·The power supply current in standby mode is 55uA ·2.9V trickle charger version ·Soft start limits surge current ·Battery temperature monitoring function ·Adopting 8-pin SOP packaging Foot position definition diagram Design considerations It is best to maintain the charging current of TP4056 at 0.37C of the battery capacity, which is 0.37 times the capacity. For example, for a 1000mAh battery, a charging current of 400mA is sufficient. Excessive charging speed will result in poor charging performance, causing the battery voltage to drop significantly after being fully charged. If the input voltage of TP4056 is too high, such as 5.2 or even 5.5V, it will cause the charging current to be less than 1000mAh, which is normal. When the voltage is high, the chip will generate heat and automatically reduce the charging current, so as not to burn out the chip. In addition, it is normal for the chip to generate heat at around 60 degrees Celsius during operation, as its charging current is high. (PS: If you have the conditions, you can use 8 * 8mm aluminum heat sinks+3M thermal conductive tape to increase chip heat dissipation.). Remember!! If TP4056 is charging a lithium battery, remember to disconnect the battery load, that is, during charging, the battery cannot supply power to other components anymore, otherwise TP4056 will be burned.