【经验】浅析Renesas血氧传感器OB1203外围电容的电容值选择以及位置注意事项
OB1203是RENESAS推出的一款血氧传感器，它集成了发射和接收，与MCU相连的就只有三根信号线，外加供电，其外围电路结构简单，易于设计，但是也有一些细节需要注意，特别是电容的布置及设计。如果电容设计或者不布置不恰当会影响传感器的供电，从而影响检测效果。
如下图1是官方推荐的设计电路，我们看到电路中有两个电容，一个是CVDD，另一个是CLED。CLED的作用就是给驱动电路瞬时供能，如图2所示，LED的瞬时驱动电流最大可以设置为250mA，所以CLED的容量建议在10μF以上，且需要尽量挨近LVDD引脚，否则可能出现LED_VDD被拉低的现象，从而造成驱动电流达不到设定值。
图1
图2
图3是OB1203的内部功能框图，从功能框图上来看，LED驱动电路与处理核心电路部分基本是分开的，CVDD连接OB1203的处理核心电路，而CLED连接内部LED驱动电路。CVDD主要作用就是退耦，普通的104电容即可，但是也需要尽量挨近VDD引脚，以获得最佳的退耦效果。
图3
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P9247-RBNDGI P9247-RBNDGI8 P9247-RB-EVK P9247-RB-EVKSMP End-Of-Life Notice (PLC230010-A1)
型号- 71V416S15BE8,OB1203LC-C4R,89HPES32H8ARI,98ULPA877AHLF,4RCD0229KB1ATG8/M,71V016SA10BFG8,89HPES33H13ZABLGI,89HPES34H16ZABLH,OB1203LC-C4V,F1375NBGI8,89HT0812PYBBC,723642L15PFG,OB1203SD-C4,OB1203SD-C4-EVK,OB1203SD-BT2-EVK,P9247-0NDGI,74FCT163244CPFG8,P8900-A0A001NBG,2509CGLFT,F1358NBGI8,72V3622L15PFGI8,QS3VH257QG8,F1431BNBGK,GX62457-HIU-EVB,89HPES64H16BLI,5962-9225802MXA,89HPES32T8ZHBXGI,71V416S12BEI8,89H64H16AG2ZDBL,F1431NBGK8,74FCT163245CPAG8,70V24S12PFG,72V3642L15PFGI,HXX14450-MCU,QS3VH245QG8,71V416S15BEG,89HPES24N3AZCBXI,723641L20PFGI8,GX78474-3-DNT,71V416S15BEI,HXR42100-EVB,71256L45TDB,71256SA20TPG,71256L25DB,P9247-GBNDGI8,89HPES48H12SZABLI,OB1203SD-C4B,89HPES10T4G2ZBBCI,54FCT16244CTEB,4DB0226KB0AVG8/M,GX32223-DNT,89HPES48H12SZABL8,QS3VH16244PAG8,OB1203SD-C4R,89HPES16T4G2ZABXGI,OB1203SD-C4V,71V016SA20BFGI8,72V3632L10PFG8,89HPES34T16ZABLI,98ULPA877AHLFT,89HT0812PYBBCG8,GX78472-DNT,QS3390QG8,HXX14450-EVB,5962-9221303MRA,74FCT16952ETPAG8,74FCT163245CPVG,89H32H8G2ZDBL,P8900-A0A002NBG,89HPES34H16ZABLHI,QS3306AS1G8,5962-8855202XA,70V24S55PFG8,P9247-10NDGI8,P9382A-10AHGI8,72V251L15PFGI,GX78471-1-DNT-EVB,72V3613L12PFG,4MX0121VA25AVG,70V24L15PFGI,4DB0232KC2AVG,89HPES12T3G2ZABCI8,6116LA120TDB,89HT0812PYBBCGI,70V24S17PFGI8,HXR44450-EVB,WP15WBD-RKSMP,89HT0516PZABCG,QS3VH245SOG,89HT0516PZABCI,71V016SA15BFG,P8900-A0A001FNG8,89HT0812PYBBCI8,71V016SA15BFI,P9247-RBNDGI,71V416S10BE,89H33H13G2ZCBLGI8,HXT14450-DNU,F1350NBGI8,71V416L10BEG8,4MX0121VA01AVG8,71V016SA15BF8,QS3251QG8,P9247-GBNDGI,89H32H8G2ZDBLI8,89HPES48H12SZABL,GX62476B-HIU-EVB,GX1000-LTE-BIAS,HXR8201-EVB,89HPES48H12SZABR,SSTE32882KA1AKG8/M,HXC44400-BFI,7025S35PFGI,89HPES12N3A2ZCBCGI,89HT0516PZABC8,GX32423-DNG,OB1203SD-UUB,SSTE32882KA1AKG8/B,89HPES12T3G2ZABCI,70V24L15PFG8,71256S45TDB,89HPES32H8AL,89HPES32H8AR,89HPES48H12SZABR8,QS3VH16245PAG8,71256L100DB,71V416L15BE8,89H64H16G2ZDBL,71V416S15BE/3143,74FCT240ATSOG,HXR14450-EVB,89HPES8T5ZHBCGI,4MX0121VA22AVG8,7285L15PAGI,4DB0226KB0AVG,GX32222-DNT,P9247-3NDGI8,P9221-P5AHGI,71V416L15BEG,P-SIP-WFR,7130SA55CM,74FCT240CTSOG8,71V416L15BEI,71V016SA12BFGI8,89HPES24T6ZCBXI,QS3VH384QG8,71V016SA20BFI,4MX0121VA21AVG,P9221-P4AHGI,8403615JA,89HM0312G2PSZBBC8,89HPES48H12BL,98ULPA877AHLFT/B,GX66474-HIU,4DB0226KB0AVG8,HXT8201-DNT,P8900-A0A002FNG8,71V016SA12BFGI,70V24S55PFG,GX39220-QUAL,71V416L12BEGI8,71V016SA20BFGI,GX39420-QUAL,F1300NBGI,P9247-RB-EVKSMP,89HM0312G2PSZBBC,70121L25JG,QS3VH257S1G8,GX78474-DNT-EVB,71V016SA20BFI8,70V35L20PFGI,74FCT163245APAG,P-SSP-WFR,70V24S12PFGI8,70V24S17PFG8,5RCD0148HC3AVG,74LVC16373APAG8,89HPES24T6ZABX,89HPES32T8ZHBXI,GX72475-DNG,72V3672L10PFG,7133SA90GB,GX62476-HIU-EVB,70V24S17PFGI,89HPES8T5ZDBC,GX64470-HIU,74FCT240ATSOG8,7132SA35C,4MX0121VA21AVG8,P9382A-10AHGI,HXR44101-DNJ,89HA0416PSBCGI8,7027L20PFGI,71V016SA12BFI8,4MX0121VA22AVG,70V24L12PFGI,89HPES24T6ZGBXGI,RTKG8HB442S00000BU,P8900-Z0Z002FNG,71V016SA20BFG8,P9221-15AHGI8,71V016SA20BF8,MX0141VA0AVG,F1320NBGI,723642L15PFG8,72V82L15PAG,71V016SA20BFG,89HA0324G2PSZCALG8,89HPES16T4G2ZABXI,F1370NBGI,4MX0121VA02AVG,TSE2004GB2C0NCG8/B,89H33H13G2ZCBLGI,89HA0324G2PSZBAL,89HPES48H12SZABRI8,HXC44400-EVB,4DB0232KC2AVG8/M,89HPES16T4ZHBCI,89HT0516PZABCGI8,71V416S15BEGI8,89H33H13G2ZCBLG8,74FCT16952ATPAG8,F1320NBGI8,QS3VH245SOG8,98ULPA877AHLF/B,HXT14100-QUAL,72V3642L15PFGI8,89H64H16G2ZDBLI,72V3642L10PFG8,QS3257S1G8,4DB0232KC2AVG/M,P9221-P5AHGI8,89HPES24N3AZCBXGI,F1385NBGI,GX66473-HIU,QS3384PAG8,TSE2004GB2C0NCG8/M,GX32425-DNT,GX74470-HIU-EVB,HXC44200-EVB,74LVCH16543APAG,F1325NBGI8,GX78471-2-DNT-EVB,71V416S10BEG8,4RCD0124KC0ATG8/M,MX0141VA0AVG8,SSTE32882KA1AKG8,72V3641L15PFG,7027S35G,89HT0812PYBBCGI8,74FCT163244CPAG8,EXP7603-DNT,QS3L384PAG8,71256L35DB,89HA0416PSZHBCGI,54FCT16245CTEB,RG8HB44200JGBX#CB0,89H32H8G2ZDBLI,4MX0121VA01AVG,GX79472-QUAL,QS3126QG,QS3VH384PAG8,P9247-RB-EVK,F1300NBGI8,89H32H8G2ZDBL8,71V016SA15BFGI8,74ALVCH162244PAG,F1358NBGI,74FCT3245APGG8,GX62474B-HIU-EVB,6116SA120DB,74ALVC16245PAG8,89HPES10T4G2ZBBCI8,89HPES24T3G2ZCBLI,70V24S17PFG,89HPES24T3G2ZCBLG,723622L15PFG,QS3244SOG8,89HA0324G2PSZBALG8,71V416S15BEGI,89HPES24T3G2ZCBL8,P9247-10NDGI,7133SA70GB,GX78471-1-DNT,QS3VH125QG8,7026L35GB,89H33H13G2ZCBL8,72V241L10PFG,74FCT162245ATPVG8,89H33H13G2ZCBLI,72V3612L12PFG,89HPES48H12BLI,GX74870-200-21,P9221-15AHGI,89H33H13G2ZCBLG,54FCT240CTDB,RTKG8HB442S01000BU,74FCT163244APFG,71V416L15BEI8,7282L15PAGI,GX74870-JIU-EVB,4MX0121VA04AVG8,QS3257QG8,OB1203SDU-C4,P8900-X1Z001FNG,QS3244SOG,74FCT163244CPAG,71V016SA12BFG,P9247-3NDGI,54FCT245TDB,89HA0416PSBCGI,7026L35G,HXT8201-EVB,HXR6104R-DNT,71V016SA12BFI,F1325NBGI,74FCT3245AQG8,GX32222-DNT-EVB,QS3L384PAG,71V416S10BEG,71V416S10BE8,71V416L15BEGI8,F0443LGRI,5962-8866202XA,723641L20PFGI,89H33H13G2ZCBL,89HPES64H16ZABLHI,89H33H13G2ZCBLI8,7284L12PAG,71V016SA15BF,71V416L15BEGI,74LVC16373APAG,GX79474-QUAL,89HPES22T16ZABLI,F1431NBGK,74FCT16952ETPAG,OB1203SD-C4AR,70V24S12PFGI,71V416L15BEG8,89HPES24T6ZGBXI,QS3VH2861QG8,OB1203SD-C4AV,7132SA55L48B,F1350NBGI,70V24L12PFGI8,QS3384PAG,74FCT163244APAG,70V24S12PFG8,SSTE32882KA1AKG/M,6116LA12
BUILDING AUTOMATION Leading-edge IoT solutions for HVAC, fire/safety, building security, and lighting
型号- RTK0EE0007D02001BJ,RA FAMILY,ISL9122A,ISL9001A,FS102,RV1S2211A,EZ-0012,TPW-RL78I1A-1C,RA6E1,RX600,RZ/A,DK-S3A7,RA6T2,RA6T1,RA2L1,TPW-RL78I1A-2C,ISL3259E,RS-485,RX600 SERIES,SLG47105,PK-S5D9,ISL29501,ISL854XX,9FGV0441,DK-S7G2,RL78 FAMILY,RX72M,RX72N,RZ/N,RZ/G2L,RZ/G2M,RZ/G2N,RAA604S00,RA6 SERIES,RTK0EE0003D01002BJ,RZ/G,RZ/V,RZ/G2E,RTK7RL23LMP00000BJ,RZ/T,RZ/G2H,SGAS7XX SERIES,RL78/L12,RL78/L13,RA2 SERIES,ISL15102,RZ/T SERIES,RX72T,RX23T,TB-S3A1,RZ FAMILY,RL78/H1D,RA4M1,RTK0EE0009D02001BJ,RA4M3,RA4M2,ISL28113,RX23E-A,RX200 SERIES,AT25XX,RTK0EMX270S00020BJ,IW1816,TB-S3A3,RX23W,SLG46537V,TB-S3A6,ISL85415,RTK0EMX270S01020BJ,RX113,RX100 SERIES,ISL85412,OB1203,RL78/G10,RAA211605,RL78/G11,RL78/G12,RL78/G13,RL78/G14,ISL3174E,RL78,RX13T,RL78/G1A,RZ/A SERIES,RL78/G1C,RL78/G1D,RL78/G1F,RL78/G1G,RL78/G1H,DA16600,RX140,RL78/G1M,RL78/G1N,RL78/G1P,RL78/G23,FS1012,SGAS711,RX700,RL78/I1X SERIES,RX24T,RX24U,RX130,SL29501RZ-T7A,ISL80XXX,RL78/F12,RL78/F13,RL78/F14,RL78/F15,TB-S5D5,RS485,RZ/N SERIES,5P49V6965,RZ/V SERIES,RX200,RA6M1,RA6M3,RA6M2,RA6M5,RA2E1,RA6M4,RA2E2,DA14531MOD,ISL29501-ST-EV1Z,RX66T,RX66N,SK-S7G2,RX671,ISL9123,TPW-RL78I1A,FS102X,DA14531,RL78I1A,RL78/G13A,HS3001,FS2012,RZ/G SERIES,HS310X,ZMOD4410-EVK,ΜPD720210,R9A06G061,SDAH02,RL78/I1A,DK-S124,SDAH01,RL78/I1B,RL78/I1C,RX100,RAA223012,RL78/I1D,DK-S128,RL78/I1E,ISL3245XE,ISL80505,RAA223011,RZ/G2,RXV2,RXV3,RYZ014A,ISL8723,RTK0EE0009D01001BJ,HS300X,RL78/I1X,RS-422,RL78/D1A,RAA239101,DA7218,RL78/L1A,RX FAMILY,RL78/L1C,ISL3159E,RX24T/U,RA4E1,RA2A1,ISL6719,RL78/G SERIES,RX700 SERIES,RX631,ZMOD4510,RX231/0,SGAS7XX,RS485T/R,R5F10267ASP,RAA2116XX,RX65N,ISL6186,PS2561F-1,ISL29501-CS-EVKIT1Z,RAA78815X,RX651,RA2,ISL29501IRZ-T7,RA4 SERIES,RA4,RL78/G,RA6,ZMOD4410,ISL85033,RA8,R9A06G037,HS3101,RTK0EE0007D01001BJ,RX65N/1,IW3627,RA4W1
End-Of-Life Notice (PLC230006-A1)
型号- HS3004-MC1,HS3103-ML1,ZWIR4512DEVKITV,280G-38LF,280PGLF,CM018-XS1933D ES,251M-22LF,280G-53LF,HS3101-MC1,F0453LEGK,6V40088DNBGI,290GLF,5T30553DCGI8,252M-63LFT,252MI-53LF,6V40182PGG8,5P49V6968A000NDGI,8305AGILFT,251MI-34LF,FS2012-1021-NG,251M-37LFT,252M-47LF,252M-62LF,280G-49LF,251M-33LF,F0452CLFGK8,251M-43LFT,252MI-65LF,ZMOD4410-EVK-HC-WP,9FGP205AKLF-1K,ZWIR4512AC2RA,280G-52LF,251M-21LF,290G-25LFT,280G-46LFT,ZMOD4415-EVK-HC,252M-51LF,290G-12LF,HS3002-ML1,8L30205NLGI,FS1023-2001-DL,HS3104-MC1,280G-52LFT,85105AGILFT,251MI-35LFT,FS1010-C01,ZMOD4415AI1V,85104AGILFT,ZMOD4415AI1R,F0453BLEGK,252M-63LF,280G-48LF,6V40096PGG8,9FGP204BKLFT,8305AGLF,252M-64LFT,F0453LEGK8,FS1012-1002-C01-LQ,251M-24LFT,FS1023-1001-DG,252MI-66LF,280AG-56LF,251M-43LF,251M-30LFT,6V40088DNBGI8,F0452LEGK,RC19004A100GNL#KB0,CM018-XS1933EB,252MI-45LFT,5T30553DCGI,280PGLFT,8V19N850DNLGI8,5T30553DCG8,251M-21LFT,FS1500-LQ,9FGP204BKLFT-1K,9FGP204BKLF,OB1203SD-BT-EVK,251MI-42LFT,251M-31LF,251PMLFT,252M-49LF,252M-26LF,252MILF,252M-64LF,FS2012-1100A-NG,553SDCGI8,HS3104-ML1,SGAS701,252M-62LFT,HS3001-MC1,251MI-43LF,85105AGILF,251M-42LF,252M-51LFT,F0452LEGK8,F0453CLFGK8,280GILF,280G-54LF,FS1010,251MILFT,ZWIR4512AC2RC002,RC19004A100GNL#BB0,251M-42LFT,SGAS711,FS1012,5L35021B-000NLGI8,251M-30LF,251M-31LFT,251MI-39LF,280G-47LFT,ZMOD4410AI3V,251M-38LF,FS1027,252M-42LF,6V40182PGG,FS1025,252PMILF,OB1203SD-RL2-EVK,FS1023,FS1023-2002-DL,ZMOD4410AI3R,251MI-42LF,HS3003-ML1,280G-53LFT,FS1025-1001-DG,252MI-45LF,252MI-64LFT,251M-41LF,251MI-43LFT,6V49003BPAGI8,280G-48LFT,8V19N850NLGI,251M-40LFT,9FGP205AKLFT,85102AGILF,251PMILF,280G-54LFT,251MI-38LF,252M-43LF,290GILF,HS3002-MC1,RC21008A000GND#BB0,9FGP204BKLF-1K,251M-37LF,HS3004,5P49V6968A000NDGI8,251MLF,HS3003,252MLFT,251M-22LFT,85104AGILF,8305AGILF-09,F0453BLEGK8,251M-40LF,252M-55LFT,6V49003BPAGI,252M-55LF,FS1027-2001-DL,252M-61LFT,252PMLF,252MI-52LFT,252M-42LFT,280GLFT,RC19008A100GND#BB0,290G-12LFT,8V19N850DNLGI/W,252MILFT,ZWIR4512AC2WA,251MILF,251M-35LFT,HS3004-ML1,280GLF,RC21008A000GND#KB0,252PMILFT,FS1027-1001-DG,F0452CLFGK,RC19008A100GND#KB0,8V19N850NLGI/W,251M-41LFT,252M-47LFT,8305AGILF,280AG-56LFT,HS3102-MC1,280GI-33LF,252MI-47LF,251MI-38LFT,252MI-48LF,9FGP205AKLF,CM018-XS1933D-360E,251M-38LFT,251PMILFT,252PMLFT,252MLF,251M-24LF,6V49152APAGI8,HS3003-MC1,HS3102-ML1,F0453CLFGK,6V40096PGG,OB1203SD-RL-EVK,280G-49LFT,251M-33LFT,252MI-65LFT,280G-47LF,290G-25LF,252MI-48LFT,CM018-XS1933E ES,251M-35LF,SMOD701KITV1,6V49152APAGI,8305AGILFT-09,F0452BLEGK,8V19N850DNLGI,5T30553DCG,280G-38LFT,252M-49LFT,290GLFT,5L35021B-000NDGI8,553SDCGI,HS3001-ML1,5L35021B-000NDGI,251MLFT,251PMLF,252M-26LFT,280GILFT,SMOD711KITV1,252MI-47LFT,5L35021B-000NLGI,8305AGLFT,ZMOD4490AI5V,85102AGILFT,F0452BLEGK8,252MI-52LF,251MI-39LFT,9FGP205AKLFT-1K,251MI-35LF,280GI-33LFT,252M-61LF,HS3103-MC1,280G-46LF,HS3103,HS3104,252M-43LFT,252MI-53LFT,ZWIR4512AC1RI,252MI-64LF,8V19N850NLGI8,HS3101-ML1,251MI-34LFT,290GILFT,OB1203SD-U-EVK
End-Of-Life Notice(PLC230010)
型号- 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
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可定制LED组件/LED传感/UV模组的电压、电流、波长等性能参数，电压：3-24V，，电流：30-3500mA，波长：270-940nm；材质：食品级POM，阻燃PC；防水等级：IP20-IP68。
最小起订量： 1000 提交需求>
可定制板装式压力传感器支持产品量程从5inch水柱到100 psi气压；数字输出压力传感器压力范围0.5~60inH2O，温度补偿范围-20~85ºС；模拟和数字低压传感器可以直接与微控制器通信，具备多种小型SIP和DIP封装可选择。
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