Driver which turns on a new AMC7135 chip for each click of the button

[tivo532]

@tivo532

@BhSimon

Does anyone know of someone who could build something similar for me? I don’t need the low-power mode and I’m basically just interested in a driver which turns on a new AMC7135 chip for each click of the button. This would create an eight-level driver without PWM. I think that could be great.

Any help would be appreciated.

Simon,

We can do it together if you like. I’m thinking of using a 20pin SSOP part but might be hard
to put/layout it in a 17mm board.

@tivo532

@BhSimon

@tivo532

We can do it together if you like. I’m thinking of using a 20pin SSOP part but might be hard
to put/layout it in a 17mm board.

I’m up for a challenge, although even the abbreviation SSOP is beyond me. I’m sure I’m out of my depth.

Let me start another topic/thread for this and see if we can do it. I’ll let you know and provide you a link.

[tivo532]

Simon,

I’ll see first if we can squeeze in 8x 7135 using an MCU in 20SSOP(Shrink Small Outline Package). If not, is this acceptable?

Addr1 - Unit 1 7135
Addr2 - Unit 2 7135
Addr3 - Unit 3 7135
Addr4 - Unit 4 7135
Addr5 - Unit 5 7135
Addr6 - Unit 6 7135
Addr7 - Unit 7 7135 with option to stack another 7135 for total of 8

Open for suggestions from BLF’ers.

Cheers!

[PilotPTK]

They don’t actually have to be individually addressable… Just in binary groups…

MCU Pin 1 - 1 AMC7135

MCU Pin 2 - 2 AMC7135s

MCU Pin 3 - 4 AMC7135s

Using only three micro pins, you can turn on 1,2,3,4,5,6 or 7 AMC7135 Chips.

[Pulsar]

1 could be single stack, 2 a single stack of two, 4 could be two stacks of 2. Then add a 4th group of 4 chips.

Edit: that would be 11 chips total, 4 pins. Probably more than you would want typically. But you could either not use more than 8 chips or program hidden mode for 11 chip turbo...I'm mnot making this so take my thoughts with a grain of salt.

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[tivo532]

@PilotPTK

They don’t actually have to be individually addressable… Just in binary groups…

MCU Pin 1 - 1 AMC7135

MCU Pin 2 - 2 AMC7135s

MCU Pin 3 - 4 AMC7135s

Using only three micro pins, you can turn on 1,2,3,4,5,6 or 7 AMC7135 Chips.

Good inputs PPtk! Using this method I can use the same 8-pin device using 4 output pins:

MCU Pin 1 - 1 7135
MCU Pin 2 - 2 7135
MCU Pin 3 - 3 7135
MCU Pin 4 - 2 7135
———————————
8 solder pads for 7135

I can turn on 1, 2, 3, 4, 5, 6, 7, 8! with option to stack MCU Pin#4 address!

[tivo532]

@Pulsar

1 could be single stack, 2 a single stack of two, 4 could be two stacks of 2. Then add a 4th group of 4 chips.

Edit: that would be 11 chips total, 4 pins. Probably more than you would want typically. But you could either not use more than 8 chips or program hidden mode for 11 chip turbo…I’m mnot making this so take my thoughts with a grain of salt.

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Good inputs too Pulsar!

[Pulsar]

6 solder pads for 11 chips... like I said though, I'm not building it. I'll probably be down to buy one if you guys put something together though.

May need to pick up some p60 dropins to support these homebrew driver builds lol

Ps: if you have an extra zilog driver you'd want to put together and sell, pm me details. Interested

[tivo532]

How about this:

MCU Pin 1 – 1 7135 - PWM for lowest mode, OFF or ON
MCU Pin 2 – 2 7135
MCU Pin 3 – 3 7135 - modify one to two stacks for total of 4
MCU Pin 4 – 2 7135 - modify each to two stacks for total of 4
———————————
8 solder pads for 7135

Option for 11x to 12x 7135.
We can also include Group 2 for blinkers, police, beacon, strobe and pulse

[tivo532]

[BhSimon]

You guys are awesome. Great design.

[PilotPTK]

Almost certainly not impossible.. But not trivial to lay out on a 17mm board...

PPtk

[comfychair]

From playing with the programmable Asgard driver and using each 7135 at a time (total of 8, so 12.5% steps), I don't think it would be particularly useful like that. You'll need at least one and maybe two low modes that are less than a single full-on 7135, and then something like 1-2-4-8-chip modes. The jump between 75%/6 chips and 100% is barely noticeable.

[Mattaus]

What MCU are you guys planning to use? I see a 20pin SSOP mentioned but then the diagram shows an 8-pin device. The text looks like Z8F04 to me...if it is I should point out that the max input voltage is only 3.6V.

I've probably got it wrong though!

[tivo532]

@comfychair

From playing with the programmable Asgard driver and using each 7135 at a time (total of 8, so 12.5% steps), I don’t think it would be particularly useful like that. You’ll need at least one and maybe two low modes that are less than a single full-on 7135, and then something like 1-2-4-8-chip modes. The jump between 75%/6 chips and 100% is barely noticeable.

Comfychair,

Actually MCU Pin 1 on post #7 is a PWM. So you can set the lowest mode from 80uA to 350mA or in steps of 1/4196 (using 16 bit PWM). You can set 1 or two modes in less than a single full-on.

Example modes:
Moonlight = 1mA >
Low = 175mA >
Low Med = 1 AMC7135 (full ON) >
Med = 2 AMC7135 >
Med HI = 4 AMC7135 >
High = 8 AMC7135 >

You can program any mode from 80uA to #AMC7135*350mA Ex. 8*350 = 2800mA).
or if stacked to 11, 11*350mA = 3850mA. I think I like this setup versus one PWM controlling all 8 AMC7135.

[BhSimon]

@tivo532

You can program any mode from 80uA to #AMC7135*350mA Ex. 8*350 = 2800mA).
or if stacked to 11, 11*350mA = 3850mA. I think I like this setup versus one PWM controlling all 8 AMC7135.

Totally agree. Great setup.

[tivo532]

@Mattaus

What MCU are you guys planning to use? I see a 20pin SSOP mentioned but then the diagram shows an 8-pin device. The text looks like Z8F04 to me…if it is I should point out that the max input voltage is only 3.6V.

I’ve probably got it wrong though!

Mattaus,

The original request was to individually turn on each 7135 from BHSimon. Initially I thought about using a 20pin SSOP but it looks like it’s too big for the board

PPtk’s input is to use binary addressing of 7135s which is really a great idea! We can use then an 8-pin MCU.

The diode drops the Vcc to the MCU to 4.2 - 0.7V which is around 3.5V. Testing at MFG usually test them at higher level than 3.6V so it’s OK. I have actually tested it at VBat=4.5V using a bench PS. See my DIY project here.

[Mattaus]

Have you got a link to the MCU you plan to use? Preferably from digikey or mouser?

[tivo532]

@Mattaus

Have you got a link to the MCU you plan to use? Preferably from digikey or mouser?

Z8F042A (4K) Digikey Standard Temp
Z8F042A (4K) Digikey Extended Temp
Z8F042A (4K) Mouser

The 4K version is hard to find now so I recommend the 8K version:

Z8F082A (8K) Digikey
Z8F082A (8K) Future

I’ll submit a product request to FastTech!

[Mattaus]

@tivo532

@Mattaus

Have you got a link to the MCU you plan to use? Preferably from digikey or mouser?

Z8F042A (4K) “Digikey Standard Temp”:http://www.digikey.com/product-detail/en/Z8F042ASB020SG/269-4167-ND/929739 Z8F042A (4K) “Digikey Extended Temp”:http://www.digikey.com/product-detail/en/Z8F042ASB020EG/269-4166-ND/929738 Z8F042A (4K) “Mouser”:Z8F042ASB020SG ZiLOG | Mouser The 4K version is hard to find now so I recommend the 8K version: Z8F082A (8K) “Digikey”:http://www.digikey.com/product-detail/en/Z8F082ASB020SG/269-3736-ND/773540 Z8F082A (8K) “Future”:http://www.futureelectronics.com/en/technologies/semiconductors/microcontrollers/8-bit/Pages/9584368-Z8F042ASH020SG2156.aspx?IM=0 I’ll submit a product request to FastTech!

You've linked 2 different 8K MCUs there...I'm assuming you're planning on using the 8pin version?

[tivo532]

Yes Mattaus, 8 pin SOIC.