Milkymist One RC1 Reports
Contents |
Initial Test on PCBA without any software
Below is shown that normal measured voltages and currents on RC1 boards without any software porting. This info is useful for diagnosis after EMS manufacturing or realization in studying/analyzing dissipation during standby mode which most parts are at quiescent or power shut down status.
Measurement of Voltage/Current during Standby/Quiescent Mode
Following data are measured from #1 & #4 pcba. The location(or reference) you can check them from RC1 Schematic. The method of measuring current is to taking apart related ferrite bead on dedicated power loop, soldering two wires on pads of ferrite bead and using Agilent 34401A digital multimeter.
| Location/Reference of Measured Voltage/Current | #1 PCBA | #4 PCBA | Spec. Reference | Datasheet
|
|---|---|---|---|---|
| L1, U1(3V3) | 15.6mA | 14mA | Typical Spec. 19mA | Page 3 of datasheet |
| L2, U1(AUDIO_AVDD) | 54mA | 51mA | Typical Spec. 53mA | Page 3 of datasheet |
| L4, U2(ETH_A3V3) | 4.7mA | 4.8mA | Not clear in datasheet | [1] |
| L5, U2(ETH_1V8) | 23.3mA | 23.5mA | Not clear in datasheet | [2] |
| L6, U2(ETH_PLL1V8) | 13.1mA | 13.1mA | Not clear in datasheet | [3] |
| L7, TP1(3V3) | 3.318V / 0.381A | 3.309V / 0.379A | [ ] | |
| L8, TP2(2V5) | 2.53V / 13.5mA | 2.538V / 13.5mA | [ ] | |
| L9, TP3(1V8) | 1.809V / 62.4mA | 1.823V / 61.1mA | [ ] | |
| L10, DCJACK(5V0) | 5.0V / 0.605A | 5.0V / 0.597A | [ ] | |
| L12, TP4(1V2) | 1.231V / 36.6mA | 1.228V / 33.5mA | 1V2 only used in fpga, Typical Spec. 15mA | Page 7 of datasheet |
| L13, U18(VAA) | 67.4mA | 67.6mA | Typical Spec. 67mA | Page 3 of datasheet |
| L17, U21(VIDEOIN_A3V3) | 170mA | 170mA | Typical Spec. 180mA(YPrPb) | Page 6 of datasheet |
| L18, U21(VIDEOIN_A1V8) | 11.3mA | 11.4mA | Typical Spec. 10.5mA | Page 6 of datasheet |
| L19, U21(VIDEO_AGND) | 99mA | 100.4mA | Reference | [ ] |
| TP5(AUDIO_VREF) | 2.232V | 2.227V | Typical Spec. 2.16V | Page 3 of datasheet |
| TP10(VD5) | 1.253V | 1.253V | Max. 1.226V | Page 3 of datasheet |
The original ods file is here.
Power Tree for Quiescent Mode
Based on above information, a plot can be achieved as below:
Power Sequence on Supplies
Since Spartan-6 doesn't need a well-control power sequence on 1.2V, 2.5V and 3.3V. But here is still mentioned.
1.8V first 120us ramp up
3.3V first 2.92ms ramp up
3.3V second ramp up to stable level after 2.63ms of 1.8V
1.2V third 280us ramp up
1.2V third ramp up to stable level after 15.8ms of 3.3V
2.5V fourth 7.76ms ramp up
2.5V fourth ramp up to stable level after 19ms of 3.3V
According to p.6 table5 of [1], the power supply ramp time of VCCINTR(1.2V), VCCO2(3.3V) and VCCAUXR(2.5V) must be within 50ms. From above scopes gallery, Milkymist One meets Spartan-6's requirement of ramp time 50ms.
