I want to know how to design the ADSP-21489 Power Circuit simply,
and I want to know why the Time Delay device(ADM1085) is needed in the VDDINT circuit.
The DSP has a specific power-up sequence like as below.
- Power Up Sequencing Timing Requirements
. VDDINT = VDDEXT +/- 200ms
- ADSP-21489 Power Circuit
. VDDEXT(3.3V@2A) -> Time.Delay(ADM1085) -> ADP1864(DCDC) -> VDDINT(1.1V@2A)
. I think Time.Delay(ADM1085) doesn't need in the VDDINT power circuit, because VDDINT is VDDEXT +/- 200ms.
. Can I remove the Time Delay Device(ADM1085)?
. Why is the Time Delay device(ADM1085) needed in the VDDINT circuit?
. Please share the simple VDDINT Power Circuit to be recommended if you have.
. VDDINT Circuit