MCHC11F1CFNE4 DOES NOT CYCLE POWER AT TEMPERATURE GREATER THAN 110F

cancel
Showing results for 
Search instead for 
Did you mean: 

MCHC11F1CFNE4 DOES NOT CYCLE POWER AT TEMPERATURE GREATER THAN 110F

101 Views
Contributor I

Product: MCHC11F1CFNE4

Description: IC MCU 8BIT ROMLESS 68PLCC

Product Packaging marking:

MCHC11F1CFNE4

0M88Y

QMZFY1920J

 

MCHC11F1CFNE4

1E63M

QMZDT1107

 

Manufacturer: NXP/Freescale

Problem:

MCU functions properly at rated temperature except for when power is cycled. When power cycling at temperatures greater than 110°F MCU appears to malfunction indicated by LEDs used to monitor MCU.  

We are using a processor supervisor (ADM698) which on power up holds the reset line low for 140ms after Vcc rises above the reset threshold (4.65V). Note the reset time increases with a rise in temperature.

Looking at the E-Clock output (Fig.1) before reset looks normal up to the rated temperature of 185°F. When power is cycled at temperature above 130°F the E-clock output looks abnormal (Fig.2). It worth mentioning that the reset pin remains high at 5V when the processor locks up.

Labels (1)
0 Kudos
1 Reply

27 Views
NXP TechSupport
NXP TechSupport

Please be aware that the MCHC11F1CFNE4 Product Information|NXP is not recommended for new design.

All the boards are failing? can you check that when you perform the power cycle you meet the power up-spec

Please check the following application note

https://www.nxp.com/docs/en/application-note/AN1744.pdf 

I hope this will help you

0 Kudos