i.MX ProcessorsのトピックDebug console LPUART1 Pulll-Down config

Debug console LPUART1 Pulll-Down config

Seongyon_Jeong — Tue, 07 Nov 2023 06:08:24 GMT

Hi.

RT1020 is used

It` simple question. but, I didn`t understand below.

In general SDK Example,

LPUART1 is used as debug console,

Its configuration is

IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B0_07_LPUART1_RX, 0x10B0U);

IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B0_06_LPUART1_TX, 0x10B0U);

0x10B0U ==> 100KOhm Pull Down

But , Generally , Is Pull-up Registance used ??

also, In schemetics of RT1020 EVk , I can see pull-up registance

Why pull-down configuration is declared ??

Re: Debug console LPUART1 Pulll-Down config

Kan_Li — Thu, 09 Nov 2023 07:23:20 GMT

Hi @Seongyon_Jeong ,

Yes, Generally , Pull-up is used, here I think it is used for better pull down strength since external pull up has been used.

Have a great day,
Kan

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Re: Debug console LPUART1 Pulll-Down config

Seongyon_Jeong — Tue, 14 Nov 2023 01:53:05 GMT

My question is,

Why 100kohm Pull down configuration setting is inserted for LPUART in SDK EXAMPLE ??

You mean,

100Kohm Pull down registance (in IOMUXC pin configuration) is internal registance inside CORE-(MCU) ,

and It is USED for pull down strength,

Because, externally 10KOhm Pull-up Registance is Connected Outside CORE-(MCU)

Is it Right ? Your meaning ???