ZB2L3 Battery Capacity Tester

[TG9541]

Yes the link you showed is the exact tester. I have 3 of them and use them to validate battery capacity of NiMH as well as my 18650's. I see this as a useful tool 3 buttons, 4 digit LED plus current sense. After seeing this forum, I desoldered the display hiding underneath it was the stm8s along with a TM1650 LED controller. Also hidden by the picture is what appears to be swim connections. I have not had time to further analyse it, but may do that in the future. I just don't have enough time and to many hobbies. Added a pic and noticed that silkscreen on the board states ZB2L3 on my other two that I purchased.

@VK6TT

Originally posted by @suskitech in #247 (comment)

[TG9541]

@suskitech:
This board looks interesting - thanks for letting us (and others) having a peek under the LED display!

I guess that the 321 on the silkscreen near the SOT23-5 chip is a generic single OP-AMP. The 8205 might be a Dual N-Channel logic enhancement mode power FET. For the TM1650 I couldn't find a datasheet - I found one e for the TM1651 and there is example code on TM1650 on GitHub.

I'll do the same surgery with my board. Let's see what else it's good for.

[VK6TT]

Here's a non-English one which is surprisingly clear on what is happening. It appears to be quite different than the TM1650. I couldn't find another source for this part to see if that manufacturer had an easier to read datasheet. Thomas, I think you're right regarding the other parts. The only thing to watch out for is the regulator. I tested 10 of the 5 volt versions of these on W1209 boards recently. Half let out smoke at 15.6 volts applied to the power connector. It still looks very appealing. Regards Richard

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_____ From: Thomas [mailto:notifications@github.com] Sent: Monday, 14 January 2019 1:59 PM To: TG9541/stm8ef Cc: Richard; Mention Subject: Re: [TG9541/stm8ef] ZB2L3 Battery Capacity Tester (#248) @suskitech <https://github.com/suskitech> : This board looks interesting - thanks for letting us (and others) having a peek under the LED display! I guess that the 321 on the silkscreen near the SOT23-5 chip is a generic single <http://www.ti.com/lit/ds/symlink/lm321.pdf> OP-AMP. The 8205 might be a Dual N-Channel logic enhancement mode power FET <https://www.ait-ic.com/uploads/2011-01/05/_1294200000_5amsl7.pdf> . For the TM1650 I couldn't find a datasheet - I found one e for the TM1651 <http://aitendo3.sakura.ne.jp/aitendo_data/product_img/ic/LED-driver/TM1651_ %20V1.2/TM1651_V1.1_EN.pdf> and there is example code on TM1650 on GitHub. I'll do the same surgery with my board. Let's see what else it's good for. - You are receiving this because you were mentioned. Reply to this email directly, view <#248 (comment)> it on GitHub, or mute <https://github.com/notifications/unsubscribe-auth/AT7ya_NVqrxmVvKy2z-dHqmnc 2FX-7fJks5vDBysgaJpZM4Z9o3J> the thread. <https://github.com/notifications/beacon/AT7ya3NC8FBNdU5M0Wwris2NLVQWwhfAks5 vDBysgaJpZM4Z9o3J.gif>

[TG9541]

@VK6TT saw to it that I got a new ZB2L3 in my mailbox. The first thing I did was to remove the LED display:

My specimen has a Nuvoton chip (which was designed to be pin compatible to the STM8S003F3P6 and it's an open question if STMicroelectronics compete on the price - Nuvoton certainly does, and it won't go away).

Did anybody trace PD1/SWIM?

[suskitech]

Man that is to bad. I ordered 4 more battery testers in hopes that it would still have the STM8 in them.

I have traced everything on the board, but did not have a chance to put it in nice format. Here is what I do have:

STM8S003F3P6 Signals
Pin	STM	Connected to
1	PD4	<-> TM1650 3 SDA
2	PD5	
3	PD6
4	NRST <- (ICP header pin 3)
5	PA1
6	PA2
7	VSS	GND
8	VCAP 105 capacitor to GND
9	VDD
10	PA3	-> LT8205 N-Channel MOSFET pins 6 and 4 (gates) 
11	PB5	-> A LED
12	PB4	-> Ah LED
13	PC3	-> V LED
14	PC4/AIN4	<- V+ in 10k/51K ratio plus .06V
15	PC5	<- OK switch closes to GND 104 cap debounce
16	PC6	<- + switch closes to GND 104 cap debounce
17	PC7	<- - switch closes to GND 104 cap debounce
18	PD1/SWIM <-> (ICP header pin 2)
19	PD2/AIN3 <- LM 321 OpAmp
20	PD3/AIN4 -> TM1650 2 SCL

I numbered the head pins left to right while reference the board in its nor usable orientation.

1 VCC (left pad only)
2 SWIM
3 NRST
4 GND (right pad only)

I also see that the version you received came with an ET6226M for the display driver instead the Titan Micro Electronics TM1650A, which has drivers in the Arduino environment.

I have to admit that the research I did on the Nuvoton showed qty 1000 pricing of $.25US vs around $.75US so with that kind of cost difference we will see more and more of this transition. There are a few tutorials that discuss programming these, but I just don't have time to learn another CPU.

[TG9541]

The LED driver chip on the new board is an ET6226M

The chip is pin compatible with the TM1650

Here is a Google translation of the functional register description:

---

ET6226 Control Program Format The ET6226 control program format is shown in the figure below.

The instruction shown below is SYSON.
Start 0 1 0 0 1 0 0 0 Ack 0 0 0 0 0 0 0 1 Ack Stop

The specific control instructions are shown in the table below.

High 8 bits	low 8 bits	function
48	00	Off display
48	01	On display (eight-segment mode)
48	09	Turn on display (seven-segment mode)
48	04	Turn on sleep
48	X1	Turn on the display, keyboard, X-level brightness X=1, first-level brightness; X=4, four-level brightness; X=0, eight-level brightness, the rest
68	XX	digital tube position 0 display, XX is 8 bits of data, the highest position is punctuation
6A	XX	digital tube position 1 display, XX is 8 bits of data, the highest position is punctuation
6C	XX	digital tube position 2 display, XX is 8 bits of data, the highest position is punctuation
6E	XX	digital tube position 3 display, XX is 8 bits of data, the highest position is punctuation
4F	—	Get button, return button code

---

The Control Register description is sketchy but it appears to be consistent with the more detailed description in the TM1650 datasheet:

  MSB LSB  
  B7 B6 B5 B4 B3 B2 B1 B0 Function Description
  ×  0  0  0  -  ×  ×  -  Brightness setting 8 levels of brightness
  ×  0  0  1  -  ×  ×  -  1 level brightness
  ×  0  1  0  -  ×  ×  -  2 brightness
  ×  0  1  1  -  ×  ×  -  3 levels of brightness
  ×  1  0  0  -  ×  ×  -  4 brightness
  ×  1  0  1  -  ×  ×  -  5 brightness
  ×  1  1  0  -  ×  ×  -  6 brightness
  ×  1  1  1  -  ×  ×  -  7 brightness
  ×  -  -  -  0  ×  ×  -  7/8 segment display control bit 8-segment display mode
  ×  -  -  -  1  ×  ×  -  7-segment display mode
  ×  -  -  -  -  ×  ×  0  Turns the display bit on/off off
  ×  -  -  -  -  ×  ×  1  on display

[TG9541]

@suskitech thanks for the pin description! I inserted some Markdown formatting, I hope you don't mind
:-).

The good news is that PD1/SWIM can be used as a communications interface just like that. An interesting observation: these guys didn't even bother to use the I2C GPIOs PB4 and PB5.

[suskitech]

I appreciate the reformatting please feel free to do so anytime. It was after midnight my time and did not want you to have duplicate my effort tracing the pins. I am new to GitHub and formatting with markdown code is another thing I need to look into.
We need a cheap source of STM8S103 chips. I can get them for about $1 each on eBay, but most of the China and HK vendors are on vacation until Feb 11 celebrating their New Year.

[TG9541]

The best price for an STM8Sx03F3P6 I've seen in a while is $0.32@10pcs. I guess it's best to order some now, they won't go bad :-) Sometimes STM8S103F3P6 breakout boards are cheaper than single STM8S003F3P6 chips.

On the other side, I think that we all have at least one board with an STM8 chip, and unless you're really in a hurry, it will take some time until the board is fully supported.

[TG9541]

I made a start by flashing the SWIMCOM binary to a ZB2L3 board - I'm trying to use M.Mahlows VOC-I2C demo in the examples folder. So far, I still get the error message I2C: ACK missing?. Maybe there are no pull-up resistors and I need to set internal pull-ups and the proper GPIO mode?

[VK6TT]

Hi Thomas, I had huge issues getting I2C working. My solution is shown below and it might help you. : I.tx ( byte -- ) \ Send a byte to the I2C Bus. DUP 7 FOR $80 AND IF SDA1 ELSE SDA0 THEN SCL1 2* DUP SCL0 NEXT 2DROP SDA1 \ **** guess fix by earlier SDA1 ?I.ACK ; Not so much as a guess, since the logic analyser showed there was a timing issue. The guess was where to pull SDA high. Regards Richard

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_____ From: Thomas [mailto:notifications@github.com] Sent: Monday, 4 February 2019 3:32 AM To: TG9541/stm8ef Cc: Richard; Mention Subject: Re: [TG9541/stm8ef] ZB2L3 Battery Capacity Tester (#248) I made a start by flashing the SWIMCOM binary to a ZB2L3 board - I'm trying to use M.Mahlows VOC-I2C demo in the examples folder. So far, I still get the error message I2C: ACK missing?. Maybe there are no pull-up resistors and I need to set internal pull-ups and the proper GPIO mode? - You are receiving this because you were mentioned. Reply to this email directly, view <#248 (comment)> it on GitHub, or mute <https://github.com/notifications/unsubscribe-auth/AT7ya4YxFjT77MmlBxcGs1SHj 4Wn9spMks5vJzlBgaJpZM4Z9o3J> the thread. <https://github.com/notifications/beacon/AT7yawGAwLH4t37H5Tavo9j6Je3toOoeks5 vJzlBgaJpZM4Z9o3J.gif>

[VK6TT]

I gave up on flea market style sourcing when I found this https://lcsc.com/product-detail/ST-Microelectronics_STMicroelectronics_STM8S 003F3P6_STM8S003F3P6_C18615.html I use LCSC for some of my business sourcing and I have been very happy. But I still watch the flea market wit great interest. Can't help myself!

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_____ From: Allen Suski [mailto:notifications@github.com] Sent: Monday, 4 February 2019 1:01 AM To: TG9541/stm8ef Cc: Richard; Mention Subject: Re: [TG9541/stm8ef] ZB2L3 Battery Capacity Tester (#248) I appreciate the reformatting and it was after midnight my time and did not want you to duplicate effort. Thanks for the clean up feel free anytime. I am new to GitHub and formatting with markdown code is another thing I need to look into. We need a cheap source of STM8S103 chips. I can get them for about $1 each on eBay, but most of the China and HK vendors are on vacation until Feb 11 celebrating their New Year. - You are receiving this because you were mentioned. Reply to this email directly, view <#248 (comment)> it on GitHub, or mute <https://github.com/notifications/unsubscribe-auth/AT7ya3CuNZqz1Ag87A3pV0rIP pDVfuXaks5vJxXKgaJpZM4Z9o3J> the thread. <https://github.com/notifications/beacon/AT7ya-DMI14FSCN0HGitqKaN9iRMqCUnks5 vJxXKgaJpZM4Z9o3J.gif>

[paulcrawford]

I ordered 10 pieces last October and paid CDN$5.56 including shipping. The same vendor is only CDN$4.42 today including shipping https://www.aliexpress.com/item/Free-Shipping-10pcs-lots-8S003F3P6-STM8S003F3P6-TSSOP-20-New-original-IC-In-stock/32919745220.html?spm=a2g0s.9042311.0.0.99794c4dgWvW62. The site Thomas quoted above is right now CDN$8.51 including shipping. The shipping is slow, 70-90 days to Canada, but if you are not in a rush...

[TG9541]

@VK6TT Richard, thanks for the code! In the far past I wrote several bit-banged I2C interfaces that were used at industrial scale, and I also learned quickly that timing is critical.

LCSC looks interesting (e.g. STM8S003F3P6 for 0.285 @10pcs) but they add $3 for handling and at least $5 for shipping... I agree that if one's business depends on the delivery that's a small price to pay.