Other Parts Discussed in Thread: REF6250
I have bought DAC11001EVM and MSP-432E401Y demo. The power-up sequence and value as below.
VDD: +5V ( same power with VIO )
VREF_PWR : +5V ( another power 5V )
The power-up sequence is : 1. VCC,VSS, VREF at the same time 2. VDD, VIO at the same time 3. Power-up the 432E401Y EVM with PC USB
After I use the board twice, I found DAC OUTPUT TP6 is always -5v. And I double confrimed the waveform ,it shows TP42( REFERENCE INPUT ) VOLATEG is powered by VDD not REF_PWR.
Even If I do not power VREF, if VDD is powerby 5V, TP42 shows 5V volatge and TP6 shows -5V voltage.
Could you please help to check if somthing wrong when I use the demo? And what's wrong with my DAC11001 EVM? Thanks.
I use multimeter to measure the REF_PWR and REF6250 INPUT, it seems they are not commencted. Is it correct?
1: REF_PWR 2. REF6250 3: EXTERNAL REF_PWR 4: VDD