How to use the single-cell battery charging chip TP4054 with a single-cell fuel gauge chip to achieve accurate power monitoring and reliable charging...

QWE4562009

How to use the single-cell battery charging chip TP4054 with a single-cell fuel gauge chip to achieve accurate power monitoring and reliable charging... [Copy link]

 

How to use the single-cell battery charging chip TP4054 with the single-cell fuel gauge chip to achieve accurate power monitoring and reliable charging. Generally, fuel gauges do not have charging functions.

dcexpert

The BAT of TP4054 is connected to the detection circuit through a sampling resistor. It is best to use a bidirectional current detection chip to detect charging and discharging.

qwqwqw2088

dcexpert published on 2021-7-2 20:58 The BAT of TP4054 is connected to the detection circuit through a sampling resistor. It is best to use a bidirectional current detection chip that can detect charging and discharging

Makes sense

The electricity meter itself detects the current size and duration of the current flowing through and converts it into capacity.

QWE4562009

dcexpert published on 2021-7-2 20:58 The BAT of TP4054 is connected to the detection circuit through a sampling resistor. It is best to use a bidirectional current detection chip that can detect charging and discharging

Discharging will not pass through the charging IC...

QWE4562009

qwqwqw2088 posted on 2021-7-3 09:14 It makes sense that the power meter itself detects the current size and duration of the current flowing through and converts it into capacity

When charging, only BAT- will flow to GND, and when discharging, only GND will flow to BAT-. What do you mean by bidirectional? The sampling resistor is connected in series with BAT, and the battery discharges and charges naturally through the sampling resistor. . . What I am asking now is how to connect the charging IC and the fuel gauge

dcexpert

QWE4562009 posted on 2021-7-3 11:40 The discharge will not pass through the charging IC. . .

The detection circuit can be put on the battery end

qwqwqw2088

QWE4562009 Published on 2021-7-3 11:44 When charging, only BAT- will flow to GND, and when discharging, only GND will flow to BAT-. What is the bidirectional you are talking about? The sampling resistor is connected in series to BAT, and the battery discharges...

That is to say, when charging, it can measure the amount of electricity passing through the battery and how much electricity is charged. When discharging, it can record how much electricity is discharged and judge how much electricity is left. The MCU can judge and calculate it, and then know the remaining power in the battery very accurately.

qwqwqw2088

I wonder if the price of this type of fuel gauge chip has also increased recently.

You can look at Meixin's

DS2780 can achieve this function

QWE4562009

qwqwqw2088 posted on 2021-7-3 17:51 I don’t know if the price of this kind of fuel gauge chip has also increased recently. You can take a look at Maxim’s DS2780, which can achieve this function

The delivery date of foreign chips is scheduled to 2023. I want to use domestic electricity meters.

QWE4562009

dcexpert posted on 2021-7-3 17:23 The detection circuit can be worn on the battery end

In other words, the fuel gauge should be connected as shown in the picture, and the charging IC output should still be connected to the positive terminal of the battery, and that's it?

qwqwqw2088

The TP4054 used by the OP is a charge control, which guides the charge into constant current mode, and then when the voltage reaches 4.2V, it starts trickle charging with a small current.

The current monitoring function is to monitor the

The max17260 on the first floor has the same function as the DS2780. It may measure more accurately and consume less power, but it has too many pins.

The DS2780 is an 8-pin IC with a simple external circuit, but it is a bit of an early chip.

QWE4562009

qwqwqw2088 posted on 2021-7-3 18:30 The TP4054 used by the OP is a charge control, which guides the charge into constant current mode, and then when the voltage reaches 4.2V, it is charged with a small current trickle charge with a current monitor...

Should I connect the charging IC as usual? And then connect the fuel gauge as shown in the figure? Discharging starts from the positive pole of the battery, passes through the upper high-end resistor, passes through the system GND and returns to the negative pole of the battery; charging starts from the positive pole of the battery, passes through the negative pole, passes through the lower low-end resistor and returns to the system GND. The charging IC and fuel gauge do not affect each other.

Is the above understanding correct?

qwqwqw2088

QWE4562009 posted on 2021-7-5 15:31 Is the charging IC connected as usual? And then the fuel gauge is connected as shown in the figure? Discharge starts from the positive electrode of the battery, passes through the high-end resistor above, and passes through the system...

The reason is this, the circuit connection depends on the instructions of the specific chip

QWE4562009

qwqwqw2088 posted on 2021-7-3 17:51 I don’t know if the price of this kind of fuel gauge chip has also increased recently. You can take a look at Maxim’s DS2780, which can achieve this function

Not ordinary expensive

DS2780E+

Brand: Maxim Integrated Package Specifications: 8-TSSOP (0.173", 4.40mm Width) Digikey number: DS2780E+-ND

Minimum Order Quantity: 1

Delivery time: 11-14 working days

Other expenses -

Unit price (including VAT) 1+：50.744732 10+：45.840699 25+：43.707096 100+：39.976003

indivual Total amount: ￥50.74 Inventory: 1773 add to the cart

DS2780G+

Brand: Maxim Integrated Package Specifications: 10-WFDFN Exposed Pad Digikey number: DS2780G+-ND

Minimum Order Quantity: 1

Delivery time: 11-14 working days

Other expenses -

Unit price (including VAT) 1+：50.744732 10+：45.840699 25+：43.707096