注意:TI提供lpDDR/DDR2/DDR3的pcb布局的接口,我们可以参考TI的方案从而不必执行电气的分析。
5.系统的电源设计 一旦框图确定了引脚复用,电路和定时器的兼容性,系统的电源就可以开始设计了,以下的资源可以用来评估系统的功耗匹配情况。
AM335x功耗总结:
功率测量设置
The power measurements have been performed on the following platform.
Texas Instruments AM335x 15x15 EVM
Base Board Revision : 1.0A
General Purpose Daughter card Revision : 1.0D
LCD Board Revision : 1.0C
Base Board SW3 settings
Switch
1
2
3
4
5
6
7
8
State
OFF
ON
ON
ON
ON
ON
ON
ON
Base Board SW4 settings
Switch
1
2
3
4
5
6
7
8
State
ON
ON
ON
ON
ON
ON
OFF
ON
AM335x Power Supply The following table describes the power supplies for AAM335x:
AM335x Power Supply railsSIGNALDESCRIPTIONVALUE
VDD_CORE Core domain 1.1V
VDD_MPU * MPU domain 0.95V - 1.26V
VDDS_RTC RTC domain 1.8V
VDDS_DDR DDR IO domain (DDR2 / DDR3) 1.8V / 1.5V
VDDS Dual voltage IO domains 1.8V
VDDS_SRAM_CORE_BG Core SRAM LDOs, Analog 1.8V
VDDS_SRAM_MPU_BB MPU SRAM LDOs, Analog 1.8V
VDDS_PLL_DDR DPLL DDR, Analog 1.8V
VDDS_PLL_CORE_LCD DPLL Core and LCD, Analog 1.8V
VDDS_PLL_MPU DPLL MPU, Analog 1.8V
VDDS_OSC System oscillator IOs, Analog 1.8V
VDDA1P8V_USB0/1 USB PHY, Analog, 1.8V 1.8V
VDDA3P3V_USB0/1 USB PHY, Analog, 3.3V 3.3V
VDDA_ADC ADC, Analog 1.8V
VDDSHV1 Dual Voltage IO domain 1.8/3.3V
VDDSHV2 * Dual Voltage IO domain 1.8/3.3V
VDDSHV3 * Dual Voltage IO domain 1.8/3.3V
VDDSHV4 Dual Voltage IO domain 1.8/3.3V
VDDSHV5 Dual Voltage IO domain 1.8/3.3V
VDDSHV6 Dual Voltage IO domain 1.8/3.3V * Note: These voltage rails are not available in the 13x13 package.
AM335x不同用法时的电力消耗: No OS : DDR Access Software : Bare metal code
Use Case : Continuous DMA read/write from/to DDR2 memory
OPP : OPP100 (ARM 550 MHz, DDR 200 MHz, L3 200 MHz, L4 100 MHz)
Power Supply
Nominal Rating
Jumper
Shunt [Ohm]
Voltage Drop [mV]
Voltage [V]
Current [mA]
Power [mW]
VDD_CORE
1.1V +/-4%
N/A
0.05
9.09
1.094
181.86
198.95
VDD_MPU*
1.1V – 1.3V +/-4%
N/A
0.05
6.04
1.105
120.82
133.49
VDDS_RTC
1.8V +/-5%
J35
2
0.63
1.801
0.31
0.56
VDDS_DDR
1.8V +/-5% / 1.5V +/-5%
J20
0.24
10.95
1.793
45.63
81.81
VDDS
1.8V +/-5%
J21
0.24
0.07
1.797
0.30
0.54
VDDS_SRAM_CORE_BG
1.8V +/-5%
J23
2
2.43
1.811
1.21
2.20
VDDS_SRAM_MPU_BB
1.8V +/-5%
J25
2
2.42
1.811
1.21
2.19
VDDS_PLL_DDR
1.8V +/-5%
J33
2
2.05
1.812
1.02
1.85
VDDS_PLL_CORE_LCD
1.8V +/-5%
J24
2
13.71
1.800
6.85
12.33
VDDS_PLL_MPU
1.8V +/-5%
J22
2
3.37
1.810
1.68
3.05
VDDS_OSC
1.8V +/-5%
J29
2
1.34
1.812
0.67
1.21
VDDA1P8V_USB0/1
1.8V +/-5%
J28
1
3.30
1.819
3.30
6.00
VDDA3P3V_USB0/1
3.3V +/-5%
J31
2
0.05
3.317
0.03
0.09
VDDA_ADC
1.8V +/-5%
J27
1
0.45
1.816
0.45
0.82
VDDSHV1
1.8 / 3.3 V +/-5%
J26
0.24
0.05
3.327
0.21
0.71
VDDSHV2
1.8 / 3.3 V +/-5%
J38
0.24
0.02
3.295
0.08
0.25
VDDSHV3
1.8 / 3.3 V +/-5%
J39
0.24
0.01
3.328
0.06
0.19
VDDSHV4
1.8 / 3.3 V +/-5%
J30
0.24
0.01
3.295
0.04
0.12
VDDSHV5
1.8 / 3.3 V +/-5%
J32
0.24
0.01
3.328
0.06
0.19
VDDSHV6
1.8 / 3.3 V +/-5%
J34
0.24
0.63
3.327
2.63
8.75
Total
455.31
No OS : Static Image Display Software : Bare metal code
Use Case : Display a static image on the LCD panel
OPP : OPP100 (ARM 550 MHz, DDR 200 MHz, L3 200 MHz, L4 100 MHz)
Power Supply
Nominal Rating
Jumper
Shunt [Ohm]
Voltage Drop [mV]
Voltage [V]
Current [mA]
Power [mW]
VDD_CORE
1.1V +/-4%
N/A
0.05
9.32
1.097
186.40
204.48
VDD_MPU
1.1V – 1.3V +/-4%
N/A
0.05
5.99
1.104
119.89
132.36
VDDS_RTC
1.8V +/-5%
J35
2
0.62
1.826
0.31
0.57
VDDS_DDR
1.8V +/-5% / 1.5V +/-5%
J20
0.24
4.96
1.800
20.67
37.19
VDDS
1.8V +/-5%
J21
0.24
0.10
1.796
0.41
0.73
VDDS_SRAM_CORE_BG
1.8V +/-5%
J23
2
2.49
1.813
1.25
2.26
VDDS_SRAM_MPU_BB
1.8V +/-5%
J25
2
2.48
1.813
1.24
2.25
VDDS_PLL_DDR
1.8V +/-5%
J33
2
2.05
1.813
1.02
1.86
VDDS_PLL_CORE_LCD
1.8V +/-5%
J24
2
13.71
1.799
6.85
12.33
VDDS_PLL_MPU
1.8V +/-5%
J22
2
3.37
1.809
1.69
3.05
VDDS_OSC
1.8V +/-5%
J29
2
1.34
1.812
0.67
1.22
VDDA1P8V_USB0/1
1.8V +/-5%
J28
1
3.25
1.818
3.25
5.91
VDDA3P3V_USB0/1
3.3V +/-5%
J31
2
0.06
3.316
0.03
0.09
VDDA_ADC
1.8V +/-5%
J27
1
0.45
1.816
0.45
0.82
VDDSHV1
1.8 / 3.3 V +/-5%
J26
0.24
0.01
3.326
0.02
0.07
VDDSHV2
1.8 / 3.3 V +/-5%
J38
0.24
0.03
3.292
0.11
0.37
VDDSHV3
1.8 / 3.3 V +/-5%
J39
0.24
0.01
3.327
0.05
0.18
VDDSHV4
1.8 / 3.3 V +/-5%
J30
0.24
0.00
3.292
0.01
0.04
VDDSHV5
1.8 / 3.3 V +/-5%
J32
0.24
0.01
3.326
0.04
0.12
VDDSHV6
1.8 / 3.3 V +/-5%
J34
0.24
0.97
3.325
4.04
13.44
Total
419.36
Linux PSP : No application running after boot Software : Linux PSP
Use Case : Command prompt after login, No application running
OPP : OPP100 (ARM 550 MHz, DDR 200 MHz, L3 200 MHz, L4 100 MHz)