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Schematic of NRF-Dual Power Circuit
What should happen is when 12V is applied the 5V LDO starts producing 5V This wi...
2
if pin 1 is pulled low how does this affect the VIN voltage value?
4
on q1 the gate is pulled down to 100k. An the gate it pulled up to 10k. The u5...
5
does u4 MCP2517FD need 5v? or can we just use 3v3
3
R3
Resistance
10kΩ
R11
Resistance
100kΩ
R8
Resistance
100kΩ
R9
Resistance
100kΩ
R10
Resistance
100kΩ
Q3
Designator Prefix
Q
If VCC on U15 is below 3.2V the RESET pin will be low, thus not allowing Q3 PMOS to conduct. This will make the input to D9 low and disconnect the battery from the circuit until VCC rises above 3.2V for 140ms.
MAX809T
Line 1
MAX809T: With a threshold voltage of around 3.08V, this variant is suitable for 3.7V LiPo battery protection. It acts close to the lower safe limit, providing a timely indication to prevent deep discharge.
Q1
Designator Prefix
Q
Q2
Designator Prefix
Q
U5
Manufacturer Part Number
MAX809

NRF-Dual Power Circuit

NRF-Dual Power Circuit thumbnail