P004A: BQ25896 Lithium Battery Charger with OLED Display

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STD P004A: BQ25896 Lithium Battery Charger with OLED Display

Arduino

Display_Module

Power_Module

License: GPL 3.0

Mode:

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Update time： 2023-10-07 14:46:16

Creation time： 2022-11-25 21:27:57

Description

I wanted to make a battery charger that was not based on the popular Chinese TP4056 IC that you see all over the internet. So after some research I came across the Texas Instruments BQ25896, this is a single cell 3A charger that can be controlled using I2C, it also has a boost mode and can turn the connected battery into a powerbank delivering up to 2A of current.

This charger IC is typically used in mobiles and I did not hand solder it, all the other standard SMD components were hand soldered.

The charger IC is controlled using an ATMEGA32U4 microcontroller, the main code was written using the Arduino IDE 2.x and the driver library was coded using Visual Studio.

The OLED module for this can be found here:

OLED Module

Github Code

Youtube Video

Hackaday Post

Design Drawing

schematic diagram

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BQ25896 Lithium Battery Charger with OLED Display
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PCB

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BQ82596 Lithium Battery Charger with OLED Display
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	ATMEGA32U4-AU	ATMEGA32U4	QFP-44_L10.0-W10.0-P0.80-LS13.2-BL	1
2	21700 SMD BATTERY HOLDER	BATT1	21700 SMD BATTERY HOLDER	1
3	WS2812B-4020	BL1,BL2	LED-SMD_WS2812B-4020	2
4	BQ25896RTWR	BQ25896	QFN-24_L4.0-W4.0-P0.50-TL-EP2.7	1
5	GSC4317YA-16R4000	BZ1	BUZ-SMD_2P-L4.0-W4.0-L_GSC4317YA	1
6	100nF	C1,C2,C3,C4,C5,C10,C12,C13,C20,C21	C0603 V2	10
7	20pF	C6,C7	C0603 V2	2
8	22uF	C8,C19	C0603 V2	2
9	1uF	C9,C11,C14,C24	C0603 V2	4
10	4.7uF	C15,C23	C0603 V2	2
11	47uF	C16	C0805	1
12	47nF	C17	C0603 V2	1
13	10uF	C18,C22	C0603 V2	2
14	1N4148W-7-F	D1,D2	SOD-123_L2.8-W1.8-LS3.7-RD	2
15	LTST-C191TBKT	D13	LED0603-R-RD	1
16	EC11L1524E03	EC1	SW-TH_EC11L1524E03	1
17	MF-NSMF050-2	F1	F1206	1
18	20021121-00006C4LF	ICSP	HDR-SMD_6P-P1.27-V-M-R2-C3-S1.27-LS5.5	1
19	30Ω	L1	R0603 V2	1
20	1.5uH	L2	IND-SMD_L6.5-W6.5-IHLP2525CZER6R8M01	1
21	X1321FV-2X04-C43D24	OLED1	HDR-TH_8P-P1.27-V-F-R2-C4-S1.27	1
22	X1321FV-2X04-C43D24 V2	OLED2	HDR-TH_8P-P1.27-V-F-R2-C4-S1.27 V2	1
23	TYPE-C-31-M-17	PWR_IN	USB-C-SMD_10P-P1.00-L6.8-W8.9 V2	1
24	U224-051N-3GRA035	PWR_OUT	U224-051N-3GRA035	1
25	DMP2100U-7	Q1	SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR-CW	1
26	SI7137DP-T1-GE3	Q2	DFN-8_L5.1-W5.7-P1.27-LS6.1-BL	1
27	MMBT2222LT1G	Q3	SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR	1
28	10kΩ	R1,R2,R6,R7,R8,R9,R10,R11,R12,R23	R0603 V2	10
29	22Ω	R3,R4	R0603 V2	2
30	160Ω	R5	R0603 V2	1
31	2.8kΩ	R13,R14,R22	R0603 V2	3
32	330Ω	R15	R0603 V2	1
33	5.23kΩ	R16	R0603 V2	1
34	30.1kΩ	R17	R0603 V2	1
35	5.1kΩ	R18,R19,RSCL,RSDA	R0603 V2	4
36	100kΩ	R20,R21	R0603 V2	2
37	TS-3025-B-C-B	RESET	SW-SMD_L3.0-W2.5-P3.40-LS4.0-L	1
38	124Ω	RILIM	R0603 V2	1
39	LTST-C191KRKT	RX	LED0603-R-RD	1
40	NTC	TH_BAT,TH_IC	C0603 V2	2
41	LTST-C191KSKT	TX	LED0603-R-RD	1
42	S-1206B33-M3T1G	U1	SOT-23-3_L2.9-W1.6-P1.90-LS1.8-L	1
43	U254-051T-4BH83-F1S	USB_MCU	MICRO-USB-SMD_U254-051T-4BH83-F1S	1
44	CG0603MLC-05E	V1,V2	R0603 V2	2
45	1kΩ	VR1	RES-ADJ-SMD_3P-L3.4-W3.4-P2.10-BR	1
46	8MHz	X1	CRYSTAL-SMD_4P-L3.2-W2.5-BL	1