Product Parameter

Product Name: 1-string lithium battery power display board

Input voltage: DC3V-20V

Applicable battery: 3.7V standard lithium battery (4.2V when fully charged) 1 series lithium battery. Comparison of power consumption requirements

Strictly, this product can be selected.

Product size: 50 * 9MM

Product Features

This series of products has 1 string, 2 strings, 3 strings, and 4 strings of lithium battery display function. Corresponding models can be set through the J1 and J2 solder pads on the circuit board. The J1 or J2 connection requires a resistance within 0-5.1K. The following are the corresponding connection methods, and users can also modify them themselves.

This product does not have anti reverse connection function. When connecting the battery, pay attention to the positive and negative terminals. Reversing the connection will burn the product!!!

This product is a battery level detection display board with buttons for power on/off function. Enter low-power mode when turned off. HW-798-B-1 is a 1-string lithium battery detection product with a button. After a short press, it will turn on and display the current battery level, and then turn off after 5 seconds. Press and hold the button for more than 2 seconds in the shutdown state to turn on the device and display the current battery level, and then shut down after 5 minutes. In the power on state, it can be directly turned off by pressing the button.

Program design for power filtering algorithm and a critical point stabilization algorithm for converting between adjacent lights. For single lithium batteries; For example, the turning point voltage between a 3-grid light and a 2-grid light is 3.75V. If the voltage happens to be at this point and the light bounces back and forth between the 2-grid and 3-grid lights, the product can effectively avoid this problem by adding a critical point stabilization algorithm.

Special note: There is a missing 0.05v data area between each adjacent area, which is the debounce area. When the battery voltage is 3.7V, two lights are displayed. At this point, when charging the battery, the voltage gradually increases, and when it is between 3.7V and 3.75V, it still displays two lights (maintaining the previous state). Once the battery voltage exceeds 3.75V, three lights will be displayed. Similarly, when the battery voltage is 3.75V, three lights are displayed. As the battery is discharging, the voltage gradually decreases. However, when it is between 3.75V and 3.7V, three lights are still displayed (maintaining the previous state). When the battery voltage drops to 3.7V, it switches from three lights to two lights. Here is a hysteresis comparison within a voltage range of 0.05V, which serves as a critical point for debounce.

The following are the operating currents in each state:

Compared to HW-798-A, the startup current of HW-798-8 is slightly higher. However, the static power consumption after shutdown is greatly reduced to around 3uA. Products with strict power consumption requirements are very suitable.

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