About LDOCAP pins in DM8148

Hi Madhura,

Madhura Shetty said:

There are 11 LDOCAPs  pins are there in DM8148 related to DSP,ARM etc...are these pins are output of internal LDOs?

Yes, these LDOCAPs pins are outputs of internal LDOs.

Madhura Shetty said:

What should be the voltages when measured in these pins?

For memory LDOs, the nominal value should be 1.2V. The max value for all LDO pins should be 1.5V. See the below resources:

DM814x datasheet, section 6.4 Electrical Characteristics Over Recommended Ranges of Supply Voltage and Operating Temperature (Unless Otherwise Noted) and section 7.2.1.2 Memory Voltage Domains

DM814x TRM, section 2.9.2 Internal LDOs Control

BR
Pavel

Madhura,

Madhura Shetty said:

Why there are two options for GPMC power?(DVDD_GPMC & DVDD_GPMCB). What is the use of this?

You can split IO voltage, you can have 1.8V on one and 3.3V one other. Otherwise (if there was only DVDD_GPMC) you have only one voltage option.(1.8V or 3.3V).

Madhura Shetty said:

and what are the differences between two?

See DM814x datasheet, section 3.2.8 GPMC. For example GPMC_CSn[7] is supplied by DVDD_GPMC while GPMC_CSn[6] is supplied by DVDD_GPMCB

BR
Pavel