场景功耗总结 | ||||||||||||
场景 | 整机功耗mW | BUCK12_0V9功耗mW | 主控功耗mW | |||||||||
Bianbu desktop主界面功耗 | 2917.46 | 979.64 | 1364.55 | |||||||||
桌面在线视频场景功耗 | 5504.79 | 2298.38 | 2868.85 | |||||||||
桌面本地视频场景功耗 | 4242.82 | 1373.40 | 1833.56 | |||||||||
AI场景功耗 | 6108.57 | 2601.17 | 3128.78 | |||||||||
CPU重载场景功耗 | 6161.40 | 3141.09 | 3558.65 | |||||||||
休眠功耗 | 159.06 | 8.42 | 32.86 | |||||||||
场景分量功耗 | ||||||||||||
测试场景3 | Bianbu desktop主界面功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V3.0、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、30W PD3.0适配器供电、WiFi连接JDSK、HDMI屏显 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
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测试方法 |
1.搭建裸板无外设+指定固件测试环境,无线WiFi联网 2.接入1080p@60fps HDMI显示器,启动到Bianbu desktop主界面,设置不休眠不挂起,静置30min后,记录最小系统及外设分量功耗10min,取平均值记为Bianbu desktop主界面功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
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电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.450 | 241.900 | 254.800 | 379.700 | 2917.46 | 54.0 | ||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.970 | 63.300 | 63.900 | 64.200 | 317.58 | 54.0 | ||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 3.996 | 546.000 | 577.300 | 825.700 | 2306.89 | 54.0 | ||||
BUCK12_0V9 | R1401 | SOC-core | 1.051 | 919.100 | 932.100 | 1655.800 | 979.64 | 54.0 | ||||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.098 | 35.500 | 36.300 | 65.200 | 39.86 | 54.0 | ||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.787 | 11.100 | 11.700 | 20.000 | 20.91 | 54.0 | ||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.646 | 14.300 | 14.600 | 32.400 | 9.43 | 54.0 | ||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.805 | 86.900 | 87.100 | 88.500 | 157.22 | 54.0 | ||||
R1407 | EMMC等外设IO供电 | 1.803 | 0.100 | 0.400 | 1.700 | 0.72 | 54.0 | |||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 3.296 | 185.300 | 186.800 | 215.500 | 615.69 | 54.0 | ||||
R1411 | EMMC等外设IO供电 | 3.289 | 136.400 | 137.700 | 139.700 | 452.90 | 54.0 | |||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 3.282 | 0.300 | 0.500 | 0.500 | 1.64 | 54.0 | ||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.789 | 10.100 | 10.300 | 10.400 | 18.43 | 54.0 | ||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.311 | 0.100 | 0.400 | 0.500 | 1.32 | 54.0 | ||||
WIFI | R1328 | WiFi模组 | 3.282 | 17.400 | 97.600 | 225.600 | 320.32 | 54.0 | ||||
BUCK4_3V3 | R1414 | PHY0 | 3.253 | 63.900 | 64.300 | 64.500 | 209.17 | 54.0 | ||||
R1415 | PHY1 | 3.255 | 64.100 | 65.000 | 65.300 | 211.58 | 54.0 | |||||
测试场景4 | 桌面在线视频场景功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V3.0、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、30W PD3.0适配器供电、USB键鼠、WiFi联网 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
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测试方法 |
1.搭建裸板无外设+指定固件测试环境,无线WiFi联网 2.接入HDMI显示器,Bianbu desktop自带浏览器网页全屏播放bilibili在线1080P视频、关闭弹幕,片源:《卧虎藏龙》,播放10min后记录最小系统及外设分量功耗10min,取平均值记为桌面在线视频场景功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
|||||||||||
电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.390 | 338.700 | 483.300 | 735.000 | 5504.79 | 77.0 | ||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.970 | 64.300 | 64.600 | 64.800 | 321.06 | 79.0 | ||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 3.986 | 785.700 | 1189.000 | 1819.700 | 4739.35 | 77.0 | ||||
BUCK12_0V9 | R1401 | SOC-core | 1.053 | 1349.300 | 2182.700 | 2956.500 | 2298.38 | 78.0 | ||||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.092 | 78.500 | 217.000 | 267.500 | 236.96 | 80.0 | ||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.782 | 18.600 | 39.300 | 46.700 | 70.03 | 77.0 | ||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.646 | 31.100 | 67.600 | 85.900 | 43.67 | 79.0 | ||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.807 | 91.300 | 92.700 | 171.000 | 167.51 | 76.0 | ||||
R1407 | EMMC等外设IO供电 | 1.806 | -0.100 | 0.400 | 44.100 | 0.72 | 77.0 | |||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 3.300 | 189.500 | 191.400 | 225.800 | 631.62 | 80.0 | ||||
R1411 | EMMC等外设IO供电 | 3.291 | 137.800 | 139.700 | 180.900 | 459.75 | 80.0 | |||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 3.283 | -0.200 | 0.000 | 0.300 | 0.00 | 81.0 | ||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.789 | 11.000 | 12.000 | 12.300 | 21.47 | 77.0 | ||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.312 | -0.300 | 0.000 | 29.800 | 0.00 | 79.0 | ||||
WIFI | R1328 | WiFi模组 | 3.272 | 17.600 | 133.100 | 261.000 | 435.50 | 80.0 | ||||
BUCK4_3V3 | R1414 | PHY0 | 3.256 | 64.800 | 65.100 | 65.300 | 211.97 | 79.0 | ||||
R1415 | PHY1 | 3.258 | 64.700 | 65.200 | 65.500 | 212.42 | 79.0 | |||||
测试场景5 | 桌面本地视频场景功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V3.0、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、30W PD3.0适配器供电、WiFi连接JDSK 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
|||||||||||
测试方法 |
1.搭建裸板无外设+指定固件测试环境,无线WiFi联网 2.接入HDMI显示器,Bianbu desktop播放本地1080P视频,播放10min后记录最小系统及外设分量功耗10min,取平均值记为桌面本地视频场景功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
|||||||||||
电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.430 | 318.600 | 371.200 | 444.700 | 4242.82 | 60.0 | ||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.970 | 69.900 | 70.100 | 70.300 | 348.40 | 59.0 | ||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 3.992 | 725.600 | 888.000 | 1189.100 | 3544.90 | 59.0 | ||||
BUCK12_0V9 | R1401 | SOC-core | 1.050 | 1244.800 | 1308.000 | 1482.300 | 1373.40 | 61.0 | ||||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.094 | 56.200 | 109.700 | 205.200 | 120.01 | 60.0 | ||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.783 | 14.600 | 22.300 | 40.800 | 39.76 | 59.0 | ||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.646 | 20.600 | 40.400 | 67.200 | 26.10 | 60.0 | ||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.805 | 89.600 | 90.600 | 105.100 | 163.53 | 60.0 | ||||
R1407 | EMMC等外设IO供电 | 1.803 | 2.200 | 2.400 | 4.100 | 4.33 | 59.0 | |||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 3.293 | 220.800 | 222.800 | 225.000 | 733.68 | 60.0 | ||||
R1411 | EMMC等外设IO供电 | 3.284 | 171.300 | 172.800 | 174.700 | 567.48 | 61.0 | |||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 3.280 | 0.500 | 0.800 | 0.900 | 2.62 | 60.0 | ||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.788 | 10.600 | 10.800 | 11.000 | 19.31 | 59.0 | ||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.312 | 0.300 | 0.700 | 0.800 | 2.32 | 60.0 | ||||
WIFI | R1328 | WiFi模组 | 3.270 | 17.600 | 139.300 | 200.900 | 455.51 | 60.0 | ||||
BUCK4_3V3 | R1414 | PHY0 | 3.242 | 64.200 | 64.800 | 95.200 | 210.08 | 60.0 | ||||
R1415 | PHY1 | 3.243 | 64.200 | 64.800 | 92.800 | 210.15 | 61.0 | |||||
测试场景7 | AI场景功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V3.0、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、30W PD3.0适配器供电、罗技USB摄像头、WiFi连接JDSK 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
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测试方法 |
1.搭建裸板无外设+指定固件测试环境 2.接入HDMI显示器、无休眠挂起,Bianbu部署目标检测AIdemo算法,10min后,记录最小系统及外设分量功耗10min,取平均值记为AI场景功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
|||||||||||
电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.350 | 446.400 | 538.200 | 714.600 | 6108.57 | 77.0 | ||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.960 | 190.800 | 191.600 | 192.500 | 950.34 | 75.0 | ||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 3.987 | 949.000 | 1104.000 | 1286.400 | 4401.65 | 81.0 | ||||
BUCK12_0V9 | R1401 | SOC-core | 1.054 | 2093.400 | 2467.900 | 2976.900 | 2601.17 | 79.0 | ||||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.094 | 59.900 | 167.400 | 193.100 | 183.14 | 77.0 | ||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.782 | 24.400 | 30.000 | 34.100 | 53.46 | 75.0 | ||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.646 | 45.600 | 60.300 | 67.000 | 38.95 | 76.0 | ||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.806 | 92.500 | 93.800 | 117.200 | 169.40 | 79.0 | ||||
R1407 | EMMC等外设IO供电 | 1.806 | 0.500 | 0.700 | 2.800 | 1.26 | 78.0 | |||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 3.297 | 189.300 | 191.200 | 193.500 | 630.39 | 76.0 | ||||
R1411 | EMMC等外设IO供电 | 3.291 | 137.500 | 139.000 | 140.800 | 457.45 | 79.0 | |||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 3.283 | 0.300 | 0.500 | 0.700 | 1.64 | 82.0 | ||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.789 | 11.200 | 11.400 | 11.500 | 20.39 | 81.0 | ||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.312 | 0.200 | 0.300 | 0.300 | 0.99 | 79.0 | ||||
WIFI | R1328 | WiFi模组 | 3.270 | 17.500 | 107.300 | 211.500 | 350.87 | 82.0 | ||||
BUCK4_3V3 | R1414 | PHY0 | 3.254 | 64.500 | 65.200 | 65.500 | 212.16 | 71.0 | ||||
R1415 | PHY1 | 3.255 | 64.600 | 64.900 | 65.400 | 211.25 | 79.0 | |||||
测试场景8 | CPU重载场景功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V3.0、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、30W PD3.0适配器供电、WiFi连接JDSK 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
|||||||||||
测试方法 |
1.搭建裸板无外设+指定固件测试环境 在Desktop终端下载dhrystone程序 wget https://nexus.bianbu.xyz/repository/image/scripts/x60_benchmarks.tar.gz -P ~/ 解压 tar -zxvf ~/x60_benchmarks.tar.gz 执行 while true; do ~/x60_benchmarks/dhrystone 1000000000 & done 2.接入HDMI显示器、无休眠挂起,Bianbu桌面+CPU dhrystone 8核满压力10min后,记录最小系统及外设分量功耗10min,取平均值记为CPU重载场景功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
|||||||||||
电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.370 | 467.700 | 541.900 | 736.500 | 6161.40 | 95.0 | ||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.970 | 64.000 | 64.700 | 64.800 | 321.56 | 95.0 | ||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 3.983 | 1129.000 | 1319.400 | 1740.200 | 5255.17 | 93.0 | ||||
BUCK12_0V9 | R1401 | SOC-core | 0.963 | 0.991 | 1.066 | 2692.600 | 3169.300 | 4052.200 | 3141.09 | 91.0 | ||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.097 | 45.900 | 54.800 | 89.300 | 60.12 | 89.0 | ||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.784 | 13.600 | 15.000 | 18.000 | 26.76 | 89.0 | ||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.647 | 16.100 | 19.100 | 25.100 | 12.36 | 91.0 | ||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.807 | 92.200 | 92.900 | 94.300 | 167.87 | 93.0 | ||||
R1407 | EMMC等外设IO供电 | 1.818 | 0.100 | 0.200 | 0.300 | 0.36 | 93.0 | |||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 3.297 | 189.100 | 191.100 | 193.100 | 630.06 | 94.0 | ||||
R1411 | EMMC等外设IO供电 | 3.313 | 137.800 | 139.600 | 145.700 | 462.54 | 94.0 | |||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 3.303 | 0.200 | 0.300 | 0.600 | 0.99 | 93.0 | ||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.801 | 10.200 | 10.300 | 10.600 | 18.55 | 93.0 | ||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.312 | 0.600 | 0.900 | 1.000 | 2.98 | 93.0 | ||||
WIFI | R1328 | WiFi模组 | 3.299 | 18.000 | 99.200 | 163.100 | 327.24 | 95.0 | ||||
BUCK4_3V3 | R1414 | PHY0 | 3.254 | 64.100 | 64.400 | 65.000 | 209.56 | 93.0 | ||||
R1415 | PHY1 | 3.255 | 63.900 | 64.400 | 64.600 | 209.62 | 95.0 | |||||
测试场景9 | 休眠功耗 | |||||||||||
详细配置 |
芯片类型:K1 6370 硬件配置:DEB1V10#25、三星4GB lp4x K4UCE3D4AB-MGCL、KLMAG1JETD-B041 16GB EMMC、PD3.0适配器、无线键鼠收发器 软件配置:https://nexus.bianbu.xyz/repository/image/k1/version/bianbu/v1.0.1/bianbu-23.10-desktop-k1-v1.0.1-release-20240607180950.zip |
|||||||||||
测试方法 |
1.搭建裸板无外设+指定固件测试环境 2.Bianbu进入休眠状态,取平均值记为bianbu OS休眠场景功耗 3.使用两个万用表以记录电压电流min/typ/max值,一个测量串入电源路径中的采样电阻的压降,已知采样电阻阻值,计算出电流填入数据;一个测量采用电阻处的电压 |
|||||||||||
电源域 | 采样点位 | 受电设备 |
实际电压(V) min |
实际电压(V) typ |
实际电压(V) max |
测试电流(mA) min |
测试电流(mA) typ |
测试电流(mA) max |
平均功耗(mW) | sensor/℃ | IC表面/℃ | 备注 |
DC-IN | R268 | 整机 | 11.610 | 13.100 | 13.700 | 13.900 | 159.06 | |||||
VCC5V0_SYS | R1303 | HDMI、USB、MIPI-DSI | 4.970 | 5.500 | 5.600 | 5.800 | 27.83 | |||||
VCC4V0_SYS | R1347 | P1&EXT DCDC | 4.008 | 24.000 | 24.100 | 58.300 | 96.59 | |||||
BUCK12_0V9 | R1401 | SOC-core | 0.653 | 12.400 | 12.900 | 13.100 | 8.42 | |||||
BUCK6_1V1 | R1416 | SOC&LPDDR4x | 1.099 | 1.700 | 1.800 | 2.000 | 1.98 | |||||
DLDO4_1V8 | R1423 | SOC&LPDDR4x | 1.787 | 4.100 | 4.300 | 4.600 | 7.68 | |||||
EXT_DCDC_0V6 | R1311 | SOC&LPDDR4x | 0.647 | 0.900 | 1.200 | 1.400 | 0.78 | |||||
BUCK3_1V8 | R1406 | SOC 1.8VGPIO等供电 | 1.802 | 7.900 | 8.200 | 8.300 | 14.78 | |||||
R1407 | EMMC等外设IO供电 | 1.802 | 0.600 | 0.800 | 1.000 | 1.44 | ||||||
BUCK4_3V3 | R1410 | SOC 3V3 GPIO等供电 | 0.049 | -0.900 | -0.900 | -0.500 | -0.04 | 测试误差,实际已关闭Buck4 | ||||
R1411 | EMMC等外设IO供电 | 0.049 | 1.400 | 1.400 | 1.700 | 0.07 | ||||||
ALDO1_3V3 | R1417 | SOC TF卡供电 | 0.000 | 0.00 | ||||||||
DLDO6_1V8 | R1425 | SOC 晶体、PLL等供电 | 1.790 | 1.100 | 1.200 | 1.300 | 2.15 | |||||
PCIE_VCC3V3 | R1329 | PCIe外设 | 3.308 | 0.800 | 0.800 | 1.000 | 2.65 | |||||
WIFI | R1328 | WiFi模组 | 3.280 | 14.300 | 14.400 | 14.900 | 47.23 | |||||
BUCK4_3V3 | R1414 | PHY0 | 0.049 | 0.600 | 0.700 | 1.200 | 0.03 | |||||
R1415 | PHY1 | 0.049 | 0.600 | 0.700 | 1.200 | 0.03 |
审核编辑 黄宇
声明:本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人,不代表电子发烧友网立场。文章及其配图仅供工程师学习之用,如有内容侵权或者其他违规问题,请联系本站处理。
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