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Discussion - Hardware / Re: Handling the RESET# when using the FT234XD with USB self-power.
« on: February 13, 2022, 10:05:13 AM »
Hello.
thank you for answering.
I understand how POR works.
I am concerned about the following two conditions.
1.
・Self Power OFF (SYSTEM Power OFF)
and
・ (Connection USB Cable or Power ON USB Host Sysytem)
Q:The voltage rises only at the #RESET pin of FT234, but does it shift to a failure mode such as latch-up?
2. Is there a problem with leaving "RESET#" unconnected (OPEN) in order to avoid latch-up concerns?
CASE:I considered the case of operating in the order of 2-1)->2-2)->2-3)->2-4)
2-1) SYSTEM Power ON and (Non Connection USB Cable or Power OFF USB Host Sysytem )
Occurs POR.
2-2) USB Plug Connection or USB Host Sysytem Power on
2-3) USB Plug DisConnection or USB Host Sysytem Power Off
2-4) USB Plug Connection or USB Host Sysytem Power on
Q:No reset occurs between 2-3) and 2-4), is there any problem for ft234?
(I'm using Google Translate.)
thank you for answering.
I understand how POR works.
I am concerned about the following two conditions.
1.
・Self Power OFF (SYSTEM Power OFF)
and
・ (Connection USB Cable or Power ON USB Host Sysytem)
Q:The voltage rises only at the #RESET pin of FT234, but does it shift to a failure mode such as latch-up?
2. Is there a problem with leaving "RESET#" unconnected (OPEN) in order to avoid latch-up concerns?
CASE:I considered the case of operating in the order of 2-1)->2-2)->2-3)->2-4)
2-1) SYSTEM Power ON and (Non Connection USB Cable or Power OFF USB Host Sysytem )
Occurs POR.
2-2) USB Plug Connection or USB Host Sysytem Power on
2-3) USB Plug DisConnection or USB Host Sysytem Power Off
2-4) USB Plug Connection or USB Host Sysytem Power on
Q:No reset occurs between 2-3) and 2-4), is there any problem for ft234?
(I'm using Google Translate.)