MM9Z1_638 EMC problem

binstar — Tue, 14 May 2019 05:53:25 GMT

Question 1 : When collecting HV current with MM9Z1_638, does the GND of the module need to be connected with ISENSEL?

Question 2: In the BCI experiment, refer to the iso11452-4 standard, the current sampling data fluctuates greatly, and what factors will affect it?

Re: MM9Z1_638 EMC problem

Q_man — Wed, 15 May 2019 06:37:55 GMT

Question 1 : When collecting HV current with MM9Z1_638, does the GND of the module need to be connected with ISENSEL?

The MM9Z1_638 is measuring the ISENSE using GND referenced Inputs. The table below (from the datasheet) indicates the limitations / requirements for proper operation:

VINC is the voltage from ISENSEH to Gnd and from ISENSEL to Gnd

VIND is the differential voltage between ISENSEH and ISENSEL

Typically the IC/module GND point should be on the Shunt resistor either the "ISENSEH-side" or "ISENSEL-side".

	ISENSEL side referenced to GND	ISENSEH side referenced to GND
Current measurement (ISENSE)	I load + I sup	I load
Voltage measurement (e.g. VSENSE2)	V bat + V drop	V bat

Question 2: In the BCI experiment, refer to the iso11452-4 standard, the current sampling data fluctuates greatly, and what factors will affect it?

Its difficult to give an exhausted answer. In general layout and Grounding has to be carefully handled. In particular avoiding any unwanted currents on the sense lines (ISENSEH/ISENSEL). Maybe you could provide more details? You can send my a direct message by clicking on my name.

topic MM9Z1_638 EMC problem in S12 / MagniV Microcontrollers

MM9Z1_638 EMC problem

Re: MM9Z1_638 EMC problem