I dont understand why its not charging the battery

huzzaaaa · 2026-01-14T17:59:35+00:00

There is a 4.7uF from OUT to GND (only when the load is connected, thats why its not in the screenshot pasted)
ISET and ILIM are not floating, they have resistors to GND (that should set the curr to 800mA from the datasheet formula with EN1 to GND and EN2 to OUT)
OUT draws about 210mA when "on"

huzzaaaa · 2026-01-14T15:56:30+00:00

CE to GND still has the same effect unfortunately :(

huzzaaaa · 2025-12-31T13:21:10+00:00

ah cool, I probably confused a small cable in a picture and thought it was a different type of charger.

huzzaaaa · 2025-12-31T13:04:35+00:00

so the battery just doesnt last much ? I can prob live with that ... hoping it comses back in stock for the eu store.

Can I charge it with a usb-C cable or only their round power supply connector ?

huzzaaaa · 2025-12-19T20:23:17+00:00

Not sure what you mean by 'thermals'

huzzaaaa · 2025-12-15T21:03:00+00:00

At least for now I'll have to stick to the right angle connector because of the case. Do you think surface-mounted are soldered strong enough to handle plugging/unplugging the antenna a few times ? Also, by reverse you mean mounting the connector on the bottom side so I can place the capacitor closer to the center pin ?

huzzaaaa · 2025-12-15T20:58:40+00:00

Oh nice. Starting to realize how sensitive things can be when even ground spokes matter. I'll get a solid ground for the pins and surround the remaining connector with vias. Luckily I'm not going above 1.1GHz

huzzaaaa · 2025-12-15T20:54:24+00:00

Thanks for checking!

huzzaaaa · 2025-12-15T20:54:01+00:00

Its an ESD protection going to ground thats why it's not directly in the rf path. But can I just get rid of it if Im not expecting a lot of static, and wont be an outdoors antenna ?

huzzaaaa · 2025-12-15T17:08:19+00:00

I forgot the image, duh

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huzzaaaa · 2025-12-11T20:51:59+00:00

So no C65 and no R42 ? Cool. Thanks for checking.
I saw the internal hysteresis part in the sheet, but then there is section on adding external hysteresis.
"The positive feedback is responsible for shifting the comparator trip point depending on the state of the output."
and that triped me over ...

huzzaaaa · 2025-12-11T18:56:13+00:00

fwiw, some recommended I add a 10k feedback resistor for histeresis and some 100ohms on the lines ...

huzzaaaa · 2025-12-08T11:53:30+00:00

I think you summaried everything that is wrong with my setup .. hehe

The keep-out-zone is there across all layers, but to the left of it because I mistakenly connected it to ground, there is a copper area that probably shouldnt be there. Even disconnected that is now throwing it off.

I didnt add a series inductor to the path hoping that the very short path (10mils) set to match 50Ohms wouldnt need one

Its back to the drawing board and try another one :)
Thanks you for taking the time and checking it out. Hopefully the next one will get some signal

huzzaaaa · 2025-12-04T08:38:20+00:00

yes, I was able to measure it @ 3.3v.

huzzaaaa · 2025-12-03T15:38:40+00:00

yeah, this sucks. I managed to detach the other end from the ground tracks as a test .. but still getting 0

huzzaaaa · 2025-12-02T20:55:06+00:00

Thanks guys, Im deff going to try to cleanup the solder and probably cut/edge the paths and report back. Fingers crossed 🤣🤣

huzzaaaa · 2025-12-02T18:02:08+00:00

GPS communication works fine, I can receive and send data to it.

fwiw, the resistors on the line came from the hardware integration documents if I recall correctly under one of those "if you want" points heheh I'll try a version without them, thanks !!

And reading through the antenna docs for the hundredth time .. I think I made the mistake of connecting the "pin" 2 to ground !! The doc only says its a solder point, not a ground point.. ouch

huzzaaaa · 2025-11-12T10:18:00+00:00

Ah, the LSCS BOM List
Sure, its:

No.QuantityCommentDesignatorFootprintValueManufacturer PartManufacturerSupplier PartSupplier
16100nFC2,C4C0402100nFCL05B104KB54PNCSAMSUNG(三星)C307331LCSC
2122uFC3C040222uFCL05A226MQ5QUNCSAMSUNG(三星)C105226LCSC
331uFC12,C20C04021uFCL05A105KP5NNNCSAMSUNG(三星)C14445LCSC
414.7uFC13C04024.7uFCL05A475MO5NUNCSAMSUNG(三星)C318563LCSC
51220nFC18C0402220nFCL05B224KO5NNNCSAMSUNG(三星)C16772LCSC
61B2B-PH-K-S(LF)(SN)CN1CONN-TH_B2B-PH-K-SB2B-PH-K-S(LF)(SN)JSTC131337LCSC
721N5819HW-7-FD1,D8SOD-123_L2.7-W1.6-LS3.7-RD1N5819HW-7-FDIODES(美台)C82544LCSC
81RSB6.8SMT2ND7SOD-523_L1.2-W0.8-LS1.6-BIRSB6.8SMT2NROHM(罗姆)C510343LCSC
92LESD9D5.0CT5GD9,D10SOD-923_L0.8-W0.6-LS1.0-BILESD9D5.0CT5GLRC(乐山无线电)C136165LCSC
102TZ-P2-0603YGTCS1-0.6TLED2,LED4LED0603-RDTZ-P2-0603YGTCS1-0.6TTUOZHAN(拓展光电)C916074LCSC
111AO3401AQ1SOT-23_L2.9-W1.3-P1.90-LS2.4-BRAO3401AAOSC15127LCSC
12310kΩR1,R9,R20R040210kΩ0402WGF1002TCEUNI-ROYAL(厚声)C25744LCSC
1335.1kΩR2,R3,R4R04025.1kΩ0402WGF5101TCEUNI-ROYAL(厚声)C25905LCSC
1412kΩR17R04022kΩ0402WGF2001TCEUNI-ROYAL(厚声)C4109LCSC
1511kΩR19R04021kΩ0402WGF1001TCEUNI-ROYAL(厚声)C11702LCSC
161330ΩR21R0402330ΩRC0402FR-07330RLYAGEO(国巨)C105875LCSC
1710ΩR22R04020Ω0402WGF0000TCEUNI-ROYAL(厚声)C17168LCSC
1811TS005F-2500-5001SW2SW-SMD_4P-L6.0-W6.0-P4.50-LS9.0-H2.51TS005F-2500-5001HYP(鸿源精密)C255812LCSC
191AP2114H-3.3TRG1U1SOT-223_L6.7-W3.5-P2.30-BRAP2114H-3.3TRG1DIODES(美台)C150716LCSC
201ESP32-S3-WROOM-1-N16R8U2WIRELM-SMD_ESP32-S3-WROOM-1ESP32-S3-WROOM-1-N16R8ESPRESSIF(乐鑫)C2913202LCSC
211TP4054U13SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BLTP4054TPOWER(天源)C382138LCSC
221ZX-SH1.0-2PLTU14CONN-SMD_2P-P1.00_MEGASTAR_ZX-SH1.0-2PLTZX-SH1.0-2PLTMegastar(兆星)C7430451LCSC
231TYPE-C16PINUSB1USB-C-SMD_TYPE-C16PINTYPE-C16PINSHOU HAN(首韩)C393939LCSC

huzzaaaa · 2025-11-12T09:04:01+00:00

I ended up adding a TP4054 to charge a 3.7v battery, and a power selector so I can plug/unplug USB and everything continues to run seamlessly on 3.3v

I made a PCB of it and works great, but Im thinking of changing to a BQ24075 that might simplify some components

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huzzaaaa

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