Project Overview and Analysis

0:22

You can connect the sublayout to the MCC board by feeding the 3.3V supply from the MCC into your sublayout's 3V3 power net. This means:

Power Connection:
- Use (or add) a terminal or net portal labeled 3V3 on your sublayout that is connected to the 3.3V rail.
- Wire the MCC board’s 3.3V output to this terminal so that the module and its supporting circuitry receive power from the external 3.3V supply.
Common Ground:
- Ensure that the ground (GND) from the MCC board is also tied to your sublayout's ground (using the proper c2e41937-4268-256c-7ae9-cb8cfb60aed3 component) so that both circuits share the same reference.

This approach lets you power the sublayout solely from the MCC board while maintaining the required connections for proper operation.

Would you like me to suggest schematic changes to add or adjust the net portal/terminal connecting the 3.3V supply?

385 days

maxjenkinsonn

can I run this layout without connecting the 5v terminal

385 days

flux

0:20

Yes, you can run the layout without connecting the 5V terminal if your design only requires the 3.3V supply. Here are a few points to consider:

Unused Terminal:
If no components in your sublayout are actively using the 5V rail, leaving the 5V terminal unconnected is acceptable. However, make sure that none of the parts require a 5V input for proper operation.
DRC Considerations:
Leaving an expected net unconnected might trigger design rule check warnings. You can either ignore these if they're non-critical or update the schematic to mark the 5V terminal as unused or "No Connect" so that DRC rules do not flag it.
Power Integrity:
Ensure that any parts previously intended to be powered by 5V either operate correctly at 3.3V (if that’s within their acceptable range) or have alternate power configurations (e.g., via internal regulators).

Would you like to update the schematic to mark the 5V terminal as not used or to suppress its connection in DRC?

Mark as No Connect

Suppress DRC Warning

Update Terminal Status

385 days

can you verify that u2 r3 resistor value will output no more than 30ma charging ...

ril3y

@copilot can you verify that u2 r3 resistor value will output no more than 30ma charging current to the battery?

copilot

To calculate the charging current for the MCP73831-2ACI/MC (U2), we use the following formula from the MCP73831 datasheet:

I_{SET} = 1000V / R_{PROG}

Where:

I_{SET} is the charging current
R_{PROG} is the value of the programming resistor, which is R3 in this case

Given that R3 has a resistance of 33kΩ, we substitute it into the formula:

I_{SET} = 1000V / 33kΩ = 30.3mA

So, the charging current provided to the battery when using a 33kΩ resistor for R3 is approximately 30.3mA, which is just slightly above 30mA. It's relatively close but if you need to strictly limit the current to no more than 30mA, you might want to consider using a slightly higher resistance value. For exact 30mA, the resistor should be 33.3kΩ.

Please note that this is an approximate value and actual results may vary due to other factors such as the tolerance of the resistor and the power supply voltage.

ril3y

what would a 32k value give me./

copilot

If we use a 32kΩ resistor for R3, we substitute it into the formula:

I_{SET} = 1000V / R_{PROG}

I_{SET} = 1000V / 32kΩ = 31.25mA

So, the charging current provided to the battery when using a 32kΩ resistor for R3 is approximately 31.25mA.

ril3y

can you suggest a value that will be below 30ma and is a standard value?

copilot

Sure, to achieve a charging current below 30mA with a standard resistor value, we need to increase the resistance. The closest standard 1% resistor value above 33.3kΩ is 33.6kΩ.

Let's calculate the charging current for this value:

I_{SET} = 1000V / 33.6kΩ = 29.76mA

So, using a 33.6kΩ resistor for R3 will result in a charging current of approximately 29.76mA, which is below 30mA.

Please note that this is an approximate value and actual results may vary due to other factors such as the tolerance of the resistor and the power supply voltage.

ril3y

give me a different common value

copilot

Sure, another common standard resistor value that is higher than 33.3kΩ is 34kΩ.

Using this value for R3, we can calculate the charging current as follows:

I_{SET} = 1000V / R_{PROG}

Substituting R_{PROG} with 34kΩ gives:

I_{SET} = 1000V / 34kΩ = 29.41mA

So, using a 34kΩ resistor for R3 would result in a charging current of approximately 29.41mA, which is below 30mA.

Again, please note that this is an approximate value and actual results may vary due to other factors such as the tolerance of the resistor and the power supply voltage.

I have 3v3 available to charge this battery. Can i use 3v3 to charge this batter...

ril3y

@copilot I have 3v3 available to charge this battery. Can i use 3v3 to charge this battery on u2?

copilot

Yes, you can use a 3.3V supply to charge the battery using the MCP73831-2ACI/MC (U2) battery charger IC.

According to the MCP73831-2ACI/MC datasheet:

The input voltage range (VDD) is from 3.75V to 6.0V, but it can operate down to 2.0V after start-up.
The IC features a constant current/constant voltage linear charger for single cell Li-Ion and Li-Polymer batteries.

However, there are a few things to note:

The lower voltage may result in a slower charge rate. The charge current is set with an external resistor from PROG to Ground. You may need to adjust this resistor value to ensure the charge current is appropriate for your battery and input voltage.
You need to make sure your 3.3V supply can provide enough current for the charging process. Check the battery specifications and the MCP73831-2ACI/MC datasheet to determine the required current.

Remember to always refer to the datasheet and battery specifications when designing battery charging circuits.

RPROG

Line 1

I_{SET} = 1000V / 34kΩ = 29.41mA

Line 2

BAT max charge current 30ma

RESET

PPS

Resistance

1.5kΩ

BT1

HOT_START

Capacitance

1.0uF

Manufacturer Part Number

LMBR0530T1G

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
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15.8k
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An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
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1.2M
875105359001
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1.2M
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1.1M

Project Name

GPS01-TD-powered-sublayout

Description

GPS01-TD module is a quad-mode GPS module that supports BDS/GPS/GLONASS/Galileo/QZSS/ SBAS and fully supports BeiDou B3, which can provide users with high quality, strong anti-jamming and low-power positioning and navigation solutions.

Properties

Designator Prefix

SUBLAYOUT

Pricing & Availability

Distributor	Qty 1
Digi-Key	$2.51–$4.37
LCSC	$8.25
Mouser	$2.57

Controls

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ril3y / GPS01-TD-powered-sublayout

Schematic