On 9/22/23 18:09, Brian White wrote:
> Took some measurements
>
> This is with the BAT54C diodes.
>
>
> While not installed in 100:
> BATT 2.99v
> RAM_RST 2.91v 7uA
> SRAM VCC 2.76v
>
>
> While installed in 100, power on, wall power, original tandy 6v adapter:
> RAM_RST 4.85v
> BATT, installed
Took some measurements
This is with the BAT54C diodes.
While not installed in 100:
BATT 2.99v
RAM_RST 2.91v 7uA
SRAM VCC 2.76v
While installed in 100, power on, wall power, original tandy 6v adapter:
RAM_RST 4.85v
BATT, installed 3.0v
BATT, not installed 3.65v 0.5uA
bkw
🙂
//Ken
From: M100 on behalf of Brian K. White
Sent: Thursday, September 21, 2023 10:53 PM
To: m100@lists.bitchin100.com
Subject: Re: [M100] rexcpm battery
I've been reading about charging protection for lithium coin cells, and
I think we might want to swap out the BAT54
PM
*To:* m100@lists.bitchin100.com
*Subject:* Re: [M100] rexcpm battery
I have repaired my REXCPM and now the github readme includes pics that
show a good way to mount a qwiic connector and where to connect bodge
wires if you want to take on the challenge of such small loose wires
going to such sma
...@gmail.com>>
*Sent:* Tuesday, September 19, 2023 10:18 PM
*To:* m100@lists.bitchin100.com <mailto:m100@lists.bitchin100.com>
mailto:m100@lists.bitchin100.com>>
*Subject:* Re: [M100] rexcpm battery
I have repaired my REXCPM and now the github readme includes pic
rian K.
> White
> *Sent:* Tuesday, September 19, 2023 10:18 PM
> *To:* m100@lists.bitchin100.com
> *Subject:* Re: [M100] rexcpm battery
>
> I have repaired my REXCPM and now the github readme includes pics that
> show a good way to mount a qwiic connector and where to connect bod
behalf of Brian K. White
Sent: Tuesday, September 19, 2023 10:18 PM
To: m100@lists.bitchin100.com
Subject: Re: [M100] rexcpm battery
I have repaired my REXCPM and now the github readme includes pics that
show a good way to mount a qwiic connector and where to connect bodge
wires if you want to t
I have repaired my REXCPM and now the github readme includes pics that
show a good way to mount a qwiic connector and where to connect bodge
wires if you want to take on the challenge of such small loose wires
going to such small places. All 4 solder points are at least a
reasonable chip leg, n
White
*Sent:* Thursday, September 14, 2023 10:16 PM
*To:* m100@lists.bitchin100.com
*Subject:* Re: [M100] rexcpm battery
On 9/14/23 21:27, Brian K. White wrote:
But somehow there is power differential between gnd and vmem (or
whatever the positive side of the big cap is, I say vmem because
obviousl
und wire
directly to the REXCPM, though I'm sure most normal people would prefer to have
it on a connector.
//Ken S.
From: M100 on behalf of Brian K. White
Sent: Thursday, September 14, 2023 10:16 PM
To: m100@lists.bitchin100.com
Subject: Re: [M100] rexcpm ba
On 9/14/23 21:27, Brian K. White wrote:
But somehow there is power differential between gnd and vmem (or
whatever the positive side of the big cap is, I say vmem because
obviously it powers the sram) on the rexcpm, and 0.7uA of current
flowing along RAM_RST.
7uA not 0.7uA!
--
bkw
also the updated design is visible here
https://github.com/bkw777/REXCPM_UPS
The schematic now also documents which pins are which on the rexcpm too
just for convenience & reference.
You *could* got ahead and export gerbers and order boards right now
without waiting. But I have a set on the wa
-wire version, which adds the ground pin... And
you’re saying the only reason it works outside the unit right now
without the ground path is because there’s leakage on the RAM_RST line?
I'd like to give it a shot ... have you done a prototype run of the 4x
battery board yet?
//Ken S
-wire version, which adds the ground pin... And
you’re saying the only reason it works outside the unit right now
without the ground path is because there’s leakage on the RAM_RST line?
I'd like to give it a shot ... have you done a prototype run of the 4x
battery board yet?
//Ken S
m100@lists.bitchin100.com
Subject: Re: [M100] rexcpm battery
Let's give THIS a try...
https://photos.app.goo.gl/JaSofoK2VotHzVco9
The connector is a standard JST-SH, and cables are available pre-made in
both 2" for the 100 and 12" for the 102 or 200.
There's even an off-the-shelf cable t
Let's give THIS a try...
https://photos.app.goo.gl/JaSofoK2VotHzVco9
The connector is a standard JST-SH, and cables are available pre-made in
both 2" for the 100 and 12" for the 102 or 200.
There's even an off-the-shelf cable that has dupont sockets on one end,
so you could connect to an unmodi
100 on behalf of Brian K.
White
*Date: *Monday, September 11, 2023 at 2:28 AM
*To: *m...@bitchin100.com
*Subject: *[M100] rexcpm battery
I thought I made the slickest thing.
https://github.com/bkw777/REXCPM_UPS <https://github.com/bkw777/REXCPM_UPS>
https://photos.app.goo.gl/i87E4wzimexCR3wL
ehalf of Brian K.
White
*Date: *Monday, September 11, 2023 at 2:28 AM
*To: *m...@bitchin100.com
*Subject: *[M100] rexcpm battery
I thought I made the slickest thing.
https://github.com/bkw777/REXCPM_UPS <https://github.com/bkw777/REXCPM_UPS>
https://photos.app.goo.gl/i87E4wzimexCR3wL6
&
circuit… maybe a
jumper that you could remove if you have the REXCPM UPS hooked up
//Ken
From: M100 on behalf of Brian K. White
Date: Monday, September 11, 2023 at 2:28 AM
To: m...@bitchin100.com
Subject: [M100] rexcpm battery
I thought I made the slickest thing.
https://github.com/bkw777
I thought I made the slickest thing.
https://github.com/bkw777/REXCPM_UPS
https://photos.app.goo.gl/i87E4wzimexCR3wL6
I was able to get 60mah of battery onto the system bus interface board
for REXCPM, and theoretically that should be able to keep the sram
memory for at least a year, but it loo
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