mc33771C open line (cell terminal open detect)

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mc33771C open line (cell terminal open detect)

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Wan
Contributor II

Hi ,NXP Enginess and All

I encountered some problems during the development of MC33771C sampling line open detection.

1th:Stop the cyclemeasure the cell voltage;

2th: Go to the diag mode,configer the sys_cfg2[go2diag] =1,

3th:  Control the switch of ODD or EVEN  sysdiag[CT_OL_ODD] =1 or sysdiag[CT_OL_EVEN] =1,

4th: Init the ADC_config;

5th :read the cell voltage;

I cut the line cell_11  measure the cell voltage by up way。cut lines voltage is more than normal‘s cells voltage , i think the cut lines volteage close zero.

Wan_0-1703148932058.png

where the switchs cotrol, register sys_diag[CT_OL_ODD/CT_OL_EVEN/CB_OL_ODD/CB_OL_EVEN]?

Wan_1-1703149520190.png

 In the end , i hope you can help me slove the problems!

thanks sir!

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guoweisun
NXP TechSupport
NXP TechSupport

For this CTx Open Detect and Open Detect Functional Verification, please download the safety manual page 24 SM02,there is detail CONFIGURATION instructions:

guoweisun_0-1703490497871.png

 

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Wan
Contributor II
thanks guoweisun! 
 
I got the 《afety manual》 and achieved the open Detect.
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Wan
Contributor II

Hello NXP Enginess and All:

     I checked the status by reading the register, I read the Sys_cfg1=0x1C41 and SYS_CFG1[GO2DIAG] =1 register to confirm that I into the diag statue and turn off the balace Sys_cfg1[MANUE_CB] =0, and found that I wrote Sys_diag[Ct_obb]=1 but read it as 0. I can't turn on an odd or even switch.

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guoweisun
NXP TechSupport
NXP TechSupport

For this CTx Open Detect and Open Detect Functional Verification, please download the safety manual page 24 SM02,there is detail CONFIGURATION instructions:

guoweisun_0-1703490497871.png

 

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