7
Q12:
Power consumption figures and temperature of Scarlet :
Testcase: running 3D graphics demo for 10 minutes :
1. DAC Power down mode off (default)
1-1. Measurements
The Temperature of package : 47 degree
The Temperature of room(Ta): 25 degree
The current consumption
: 630mA @VDDI-pin(2.5V)
6mA @VCC-pin(2.5V)
25mA @VDDE-pin(3.3V)
1-2. Estimates
The power consumption
: 1.672W
A rise rate of package
: 16 degree/W
The temperature of package : 25(Ta) + 1.672*16 = 51.752degree
85(Ta) + 1.585*16 = 111.752degree
2. DAC Power down mode on
2-1. Measurements
The temperature of package : 47 degree
The Temperature of room(Ta): 25 degree
The current consumption
: 595mA @VDDI-pin(2.5V)
6mA @VCC-pin(2.5V)
25mA @VDDE-pin(3.3V)
2-2. Estimates
The power consumption
: 1.585W
A rise rate of package
: 16 degree/W
The temperature of package : 25(Ta) + 1.585*16 = 50.36 degree
85(Ta) + 1.585*16 = 110.36 degree
Q13:
DAC power down mode :
If only the digital video interface is used for a digital display, is it
possible for power consumption reduction to save the resistors at Vref-, AOUTR/B/G-, ACOMPB- and
VRO-pin and leave them open or connect them to GND or Vcc (2.5V or 3.3V?) directly?
The DAC can be set in an undocumented "power down mode".To active this mode, write
"0x00000001" to the register mapped at address "H0038h". In this mode, all analog
pins can be connected to GND. Those pins are :
AVD, AVS, AOUTR, AOUTG, AOUTB, VREF, ACOMPR, ACOMPG, ACOMPB, and VRO.
Q14:
If CCLK and VI(0..7) at SCARLET are not used, what has to be done with them?
Please connect to GND.
