What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks.

キャンセル
次の結果を表示 
表示  限定  | 次の代わりに検索 
もしかして: 

What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks.

883件の閲覧回数
davidwong
Contributor I

What is the minimum driving strength (mA) for external driver to properly do reset configuration of the ColdFire/MCF54418CMJ250 (pins: BOOTMOD[1:0], FB_AD[7:0])? Thanks.

ラベル(1)
0 件の賞賛
返信
1 返信

759件の閲覧回数
TomE
Specialist II

MCF54418 Data Sheet.

"Table 5. MCF5441x Signal information and muxing" shows BOOTMOD[1:0] and FB_AD[7:0] don't have pullups or pulldowns. FB_AD[15:8] do have Pulls on Reset though.

Section "Table 11. I/O electrical specifications" gives the "Input Leakage Current" for the pins.

If you look at the Reference Manuals, they usually say things like "The logic levels for reset configuration on FB_AD[7:0] must be actively driven when BOOTMOD equals 01". Then you check the Reference Designs and the Development Modules and find they often just use pullup or pulldown resistors on these pins. I've noted this here:

https://community.nxp.com/message/100980?commentID=100980#comment-100980

Tom

0 件の賞賛
返信