16:1 mux for thermistors

allows for over 5 thermistor reading per module

to replace old one

requires 4-5 GPIO outputs for logic control pins 1 GPIO for in/output pin -can all be wired into P6

old mux has clock and other things is this necessary or only because it was using one line of communication for selection?

changes:

2 pcb thermistors → same

30 battery pack thermistors → 14

old communication:

Open

new:

Open

Buffers

• to replace old one

  • in case we overload 5V reference from MCU

• to replace old one

  • buffers output from thermistor multiplexor

LDO

To replace old one

Mosfets - basically the same thing

To replace old one

Old Invertor? - might not be needed if we dont have SCLK going to GPIO from mux… in stock

Voltage regulation - in stock but only 300

Isolator - in stock

No longer needed since we found old MCUs:

SPI to isolated SPI convertor

convert to isolated spi for communication with other boards

MC33771BSP1AE

Sample Program - we need to sign up for an account

SPI interface

7-14 cell readings per chip → 4 modules per AFE board and (try to order 4 chips for sample)

Voltage, Temperature and Current sensing

9.6V - 63V Vpwr could be powered by the cells it is monitoring as long as we only monitor 3 modules/chip (3*4series*4.2max = 50.4V 4*4series*4.2max = 67.2V)

or we plan to power the AFEs externally?

5V at 5mA reference supply output

7GPIO pins