Integrating the LPC54102 and MC33908 for Safety Applications

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jhd on Wed Dec 23 11:06:51 MST 2015

I'm connecting (trying it  :) ) a MC33908N and LPC54102 and I have some doubts, to see if you can help me.

I followed the AN4442 (Rev.2, 2014)  Integrating the MPC5643L and MC33908 for Safety Applications and AN5099 (rev.0,4/2015). I have not found a AN to integrate the LPC54102 but I guess that is similar to MPC5643L.

I need to power a LPC54102 and other periphericals with 3,3V from a 12V battery (normally Yuasa, 12V (16A, 18A, 20A) similar to this for Yamaha VX 2009-2012 http://www.yuasa.co.uk/ytx20hl-bs-pw.html). 

The circuit is to be powered generally by Yamaha VX/VX110 and/or BRP SeaDoo GTI 130 (of any year). And it is connected to Accesories Bus from the PWC. This bus has a mini auto fuse of 15A (LittlelFuse).

Supplying power devices are as follows:

LPC54102  -- 3V3 - I think as much 10mA.
BMX055  --  About 5.5mA
BMP280  --  2.7uA
Telit SL869 GPS --  3V3  Acquisition GPS+GLO = 67 mA
Adeunis NB868-500mW  --  3V3  -- Tx=700mA(27dbm) :: Rx=35mA

I believe that I can connect to VCore (3.3V) of MC33908 the LPC54102, BMX055, BMP280 and Telit SL869 GPS, but the NB868-500mW It consumes 700 mA when transmitting, and I think the VCore the MC33908 can only deliver up to 300mA (please correct me if I'm wrong). If so, then where I can connect the NB868-500mW?

I attach a portion of the schematic in pdf because I'm having problems when exporting to pdf in KDE with Kicad.  Anyway you can see it from Kicad ,  https://github.com/jetremote/JetRemoteXP

Sorry me english.

Best regards