Converting an MSS54/HP into an MSS54HP CSL (H-bridge)

[sapote]

we have 2 choices: either MC33886 or MC33887, depending on how the original chip pin8 COD was used on the board -- connected to gnd or Vcc.
Pic below shows pin8 is connected to something; can someone verify it's to gnd or 5v? Just check p8 connected to p1 or p10, if not then I assume it's connected to 5v as I don't think p8 is connected to the MCU I/O pin for more complex control of the function of the D1 and D2 pins.

[sapote]

Just did a quick search on Mourse and found this chip MC33887APVW, very close to the stock driver, qt 12,000 pieces available.
MC33887APVW

https://www.mouser.com/ProductDetail/NXP-Semiconductors/MC33887APVW?qs=NnG%2FAzKRagn7Z050O%252BXtJQ%3D%3D

I will take a close look at its spec compared to the 33186 to see if it's 100% compatible.

[sapote]

Anyone know of a source to get new H bridge chips?

It seems the Bosch chip recommended in post #8 has been discontinued.

The stock 20pin H bridge chip has the typical spec of 5A continuous output current, 2 pwm control inputs, 2 Enable input (one active high and one active low logic), and a status feedback for fault monitoring. There should be plenty of H bridge chips out there for substitute, and even if the new chip is not 100% pin compatible it's not hard to use them on this board. As long as the new chips have the heat sink pad (under the package) is GND instead of 12v, then it can be soldered for heat sink purpose, and the incompatible pins can be bent up off the board and short jumper wires can be connected to the pins and pcb pads to make it works. The 4 internal power FETs are N channel with Drain connected to 12v (and it's the reason for the charge pump external cap to pump up the supply voltage to Vbatt + 14v to drive the upper N-FETs of the H bridge), and so for max heat sink performance the heat sink pad should be 12v and not GND, and so I'm not surprised many of the new high performance H-bridge chips have the heat pad connected to 12v.

I will take a look at the supplier sites such as Infineon, STMiro, Ti, Analog Devices.

[S54B32]

Ms43 DMEs, they have the original h bridge chip thats used for the throttle body. I usually find those and desolder the h bridge chips off them.

Also my source, 4 Zylinder Bosch units also have one. otherwise you sometimes find NOS on eBay or you try Chinese clones (like 99.9% of the 29F400). They work 3 out of 5 times per my expierence.

[Riley]

for electrical components your first stop should always be digikey

The parts are discontinued otherwise I would agree
😂

[nextelbuddy]

Anyone know of a source to get new H bridge chips?

It seem the Bosch chip recommended in post #8 has been discontinued.

Ms43 DMEs, they have the original h bridge chip thats used for the throttle body. I usually find those and desolder the h bridge chips off them.

[ugaexploder]

Anyone know of a source to get new H bridge chips?

It seem the Bosch chip recommended in post #8 has been discontinued.

for electrical components your first stop should always be digikey

https://www.digikey.com/en/products/filter/pressure-sensors-transducers/512?s=N4IgTCBcDaILIAUAaBBAbARgwVhSAugL5A

[Riley]

Anyone know of a source to get new H bridge chips?

It seems the Bosch chip recommended in post #8 has been discontinued.

[HoDoo]

Hello,
Has anyone managed to resolve the sync issue with EWS after Full bin flashing?

It seems like there are no issues with re-syncing EWS after flashing full bin with BDM,
but since I don't have BDM, I used 'MSSFlasher' for flashing.
I used an extra DME (MSS54HP) instead of the original DME.

However, when I pressed the virginize button,
the ISN information area did not reset, and instead, a timeout occurred.

If anyone who has flashed CSL bin using 'MSSFlasher' has successfully re-synced EWS,
I would appreciate hearing your advice.


How can I make the DME (MSS54HP) virgin?

The Virginize function of 'MSSFlasher' seems to erase VIN information,
but it appears that the ISN information area does not reset.
Is it supposed to reset entirely?

Please help me ;(

[Jeppe1976]

Looking correct, if you are not on a crazy high mountain at the moment

Not at all , im located in south of Sweden 60 meter above sea level.

[AllenE46]

Well written and a great thread. Thank you

[S54B32]

I would guess the Barometric pressure is the one being read from DME? because if i disconnect the external one nothing changes in the reading. And on my location it is: Barometric Pressure: 100KPa

I used my Autel diagnostic tool "Live data" to get the reading

Looking correct, if you are not on a crazy high mountain at the moment

[Jeppe1976]

Just read the pressure via Tool32 to see if the value is valid related to your location.

I would guess the Barometric pressure is the one being read from DME? because if i disconnect the external one nothing changes in the reading. And on my location it is: Barometric Pressure: 100KPa

I used my Autel diagnostic tool "Live data" to get the reading

[S54B32]

Hi,

How do i know if the onboard pressure sensor is changed? And what would happen if i change the Pressure scale like you mention below? Is there any risk the DME dies?


"Also the onboard pressure sensor is different. You can either install one with the same specs as the MSS54HPs (MPXA6115A or MPXAZ6115A), or you can change the pressure scale (at 0xC476, change "D3 1C 12" to "C2 5F 03"). "

Just read the pressure via Tool32 to see if the value is valid related to your location.

[Jeppe1976]

Hi,

How do i know if the onboard pressure sensor is changed? And what would happen if i change the Pressure scale like you mention below? Is there any risk the DME dies?


"Also the onboard pressure sensor is different. You can either install one with the same specs as the MSS54HPs (MPXA6115A or MPXAZ6115A), or you can change the pressure scale (at 0xC476, change "D3 1C 12" to "C2 5F 03"). "

Originally posted by Terra on M3Forum:

Might as well post this



Red resistors are the ones you definitely have to change if you want to use the MAP sensor. 7.15 kΩ resistors seem to do the trick there. The yellow ones are also different (10 kΩ on the MSS54HP, 1 kΩ on the non-HP), but they don't appear to effect anything.

Also the onboard pressure sensor is different. You can either install one with the same specs as the MSS54HPs (MPXA6115A or MPXAZ6115A), or you can change the pressure scale (at 0xC476, change "D3 1C 12" to "C2 5F 03"). Sorry, forgot to mention that in the emails to you NZ

One thing I want to make clear is that this is still fairly experimental. You're modifying the DME in ways BMW never intended. While I've done a fair bit of testing, it's impossible for me to test all scenarios.