13. Since there are 4 digits of the display, you will need to use 4 BJTs in this

Question

13. Since there are 4 digits of the display, you will need to use 4 BJTs in this lab to drive them. The pin corresponding to each segment will require a corresponding current limiting resistor between it and the GPIO pin on the microcontroller. Given the maximum allowable collector current of the BJT, the number of segments of the display per digit (remember the decimal point!), and the typical forward voltage of the segment LEDs, what is the minimum allowable current limiting resistor needed for each segment? 14. What is maximum input operating voltage of the LDO (MCP1700-3302E/TO)? 15. What are the conditions given for minimum input operating voltage (found on page 3 of the datasheet)?. 16. The specific LDO used in this lab has an output voltage of VR = 3.3V. Approximately what is its minimum input operating voltage at room temperature and 200 mA load (use Figure 2-12 from the datasheet)?. 17. Locate the typical application circuit for the LDO. Are any additional components necessary for this application? If so, list them here: 18. What is the chemistry of the battery used in this lab (LIR2302)? 19. What is the nominal voltage of the battery? MEN 3150 - Lab 2: User Interface and Power Management Page 14 20. What is the nominal capacity of the battery? 21. Under standard charging conditions, what is the constant charge current value for this battery? (Remember, "C" is the capacity of the battery). 22. What is the input voltage range of the battery management IC (STC4054GR)? 23. Describe the function of the programming resistor RPROG: 24. Assuming standard charge conditions for the battery, what should be the value of RProg? 25. From the datasheet, write down the equation for the battery charging current in terms of RPROG and the voltage at the PROG pin:

Explanation / Answer

Since u didn't provide the data sheet a part of the question has been answered

14.max input voltage: 6v

15.The minimum VIN must meet two conditions: VIN greater than or equal to 2.3V and VIN greater than or equal to (VR + 3.0 ) + VDROPOUT.

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