iMX287 RTC

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iMX287 RTC

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7_xi
Contributor I

IMX287 RTC能够独立供电及运行吗?手册上写的不清楚?

另外IMX287的网口支持ISA模式吗,怎么接线?有硬件设计说明吗?

资料太少了。

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7_xi
Contributor I

急,为什么没审批没答复?

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180 Views
7_xi
Contributor I

1. RTC OK

2. 之前的设计Ethernet是采用Core(TCC7901)+CS8900A,Ethernet 接口采用ISA BUS总线型式,我们现在底板(底板集成有CS8900A)想不改,只想更换核心板,我想问iMX287的Ethernet支不支持ISA BUS总线接口型式,如果支持,硬件怎么连接?

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180 Views
Yuri
NXP TechSupport
NXP TechSupport

Hello,

  

  Please use Chapter 22 (Real-Time Clock Alarm Watchdog Persistent Bits) of the

i.MX28 Reference Manual. Basically to get the RTC working in power down mode

battery power (BATT) should be applied.

 

  It is possible to configure the battery supply only for RTC domain:

when using a battery and a 5V power connection, the customer should apply the

same circuit connections in the "i.MX28 Reference Schematics", which are posted

on the Web.

 

This can be accomplished as follows:

 

1. Clear the DCDC_XFER bit (bit 5) in the HW_POWER_5VCTRL register, which will

disable the automatic transition to the DCDC converter (from the battery) when

5V power is removed.

 

2. Set the PWDN_5VBRNOUT bit (bit 7) in the HW_POWER_5VCTRL register, which will

automatically power down the device when 5V is removed.

 

3. Also, customers may want to set the PWDN_BRNOUT bit (bit 18) in the

HW_POWER_VDDIOCTRL, which will automatically power down the device when a VDDIO

brownout occurs. Note this only has effect if 5V is not present. After the VDDIO

brownout is set up, a VDDIO brownout will occur because the SW will not be setup

to run from the battery (via the DCDC converter) when 5V is removed, because the

DCDC_XFER bit will be cleared.

 

 

  As for i.MX28 network - what do You mean? Please clarify in more details.

 

Have a great day,

Yuri

 

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