ESP32 WROOM 32D & ESP32 WROOM 32U - Espressif
ESP32 WROOM 32D &ESP32 WROOM 32UDatasheetVersion 2.1Espressif SystemsCopyright 2021www.espressif.com
About This DocumentThis document provides the specifications for the ESP32-WROOM-32D and ESP32-WROOM-32Umodules.Document UpdatesPlease always refer to the latest version on ments.Revision HistoryFor revision history of this document, please refer to the last page.Documentation Change NotificationEspressif provides email notifications to keep customers updated on changes to technical documentation.Please subscribe at www.espressif.com/en/subscribe. Note that you need to update your subscription to receivenotifications of new products you are not currently subscribed to.CertificationDownload certificates for Espressif products from www.espressif.com/en/certificates.
Contents1Overview62Pin Definitions82.1Pin Layout82.2Pin Description82.3Strapping Pins103Functional Description123.1CPU and Internal Memory123.2External Flash and SRAM123.3Crystal Oscillators123.4RTC and Low-Power Management134Peripherals and Sensors145Electrical Characteristics155.1Absolute Maximum Ratings155.2Recommended Operating Conditions155.3DC Characteristics (3.3 V, 25 C)155.4Wi-Fi Radio165.5BLE Radio175.5.1Receiver175.5.2Transmitter175.6Reflow Profile186Schematics197Peripheral Schematics218Physical Dimensions239Recommended PCB Land Pattern2510 U.FL Connector Dimensions2711 Learning Resources2811.1Must-Read Documents2811.2Must-Have Resources28Revision History30
List of Tables1ESP32-WROOM-32D vs. ESP32-WROOM-32U62ESP32-WROOM-32D and ESP32-WROOM-32U Specifications73Pin Definitions84Strapping Pins105Absolute Maximum Ratings156Recommended Operating Conditions157DC Characteristics (3.3 V, 25 C)158Wi-Fi Radio Characteristics169Receiver Characteristics – BLE1710Transmitter Characteristics – BLE17
List of Figures1ESP32-WROOM-32D Pin Layout (Top View)82Reflow Profile183ESP32-WROOM-32D Schematics194ESP32-WROOM-32U Schematics205ESP32-WROOM-32D & ESP32-WROOM-32U Peripheral Schematics216Physical Dimensions of ESP32-WROOM-32D237Physical Dimensions of ESP32-WROOM-32U248Recommended PCB Land Pattern of ESP32-WROOM-32D259Recommended PCB Land Pattern of ESP32-WROOM-32U2610ESP32-WROOM-32U U.FL Dimensions27
1 Overview1 OverviewESP32-WROOM-32D and ESP32-WROOM-32U are powerful, generic Wi-Fi BT BLE MCU modules that targeta wide variety of applications, ranging from low-power sensor networks to the most demanding tasks, such asvoice encoding, music streaming and MP3 decoding.ESP32-WROOM-32U is different from ESP32-WROOM-32D in that ESP32-WROOM-32U integrates a U.FLconnector. For detailed information of the U.FL connector please see Chapter 10. Note that the information inthis data sheet is applicable to both modules. Any differences between them will be clearly specified in the courseof this document. Table 1 lists the difference between ESP32-WROOM-32D and ESP32-WROOM-32U.Table 1: ESP32 WROOM 32D vs. ESP32 WROOM 0WDESP32-D0WDSPI flash32 Mbits, 3.3 V32 Mbits, 3.3 VCrystal40 MHz40 MHzAntennaonboard antennaDimensions(18.00 0.10) (25.50 0.10) (3.10 0.10)(18.00 0.10) (19.20 0.10) (3.20 0.10)(Unit: mm)(See Figure 6 for details)(See Figure 7 for details)SchematicsSee Figure 3 for details.See Figure 4 for details.U.FL connector (which needs to be connectedto an external IPEX antenna)At the core of the two modules is the ESP32-D0WD chip that belongs to the ESP32 series* of chips. The chipembedded is designed to be scalable and adaptive. There are two CPU cores that can be individually controlled,and the CPU clock frequency is adjustable from 80 MHz to 240 MHz. The chip also has a low-powerco-processor that can be used instead of the CPU to save power while performing tasks that do not require muchcomputing power, such as monitoring of peripherals. ESP32 integrates a rich set of peripherals, ranging fromcapacitive touch sensors, Hall sensors, SD card interface, Ethernet, high-speed SPI, UART, I²S and I²C.Note:* For details on the part numbers of the ESP32 family of chips, please refer to the document ESP32 Datasheet.The integration of Bluetooth , Bluetooth LE and Wi-Fi ensures that a wide range of applications can be targeted,and that the module is all-around: using Wi-Fi allows a large physical range and direct connection to the Internetthrough a Wi-Fi router, while using Bluetooth allows the user to conveniently connect to the phone or broadcastlow energy beacons for its detection. The sleep current of the ESP32 chip is less than 5 µA, making it suitable forbattery powered and wearable electronics applications. The module supports a data rate of up to 150 Mbps,and 20 dBm output power at the antenna to ensure the widest physical range. As such the module does offerindustry-leading specifications and the best performance for electronic integration, range, power consumption,and connectivity.The operating system chosen for ESP32 is freeRTOS with LwIP; TLS 1.2 with hardware acceleration is built in aswell. Secure (encrypted) over the air (OTA) upgrade is also supported, so that users can upgrade their productseven after their release, at minimum cost and effort.Table 2 provides the specifications of ESP32-WROOM-32D and ESP32-WROOM-32U.Espressif Systems6ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
1 OverviewTable 2: ESP32 WROOM 32D and ESP32 WROOM 32U ificationsRF CertificationFCC/CE-RED/IC/TELEC/KCC/SRRC/NCCWi-Fi CertificationWi-Fi AllianceBluetooth certificationBQBGreen CT/ESD802.11 b/g/n (802.11n up to 150 Mbps)ProtocolsWi-FiA-MPDU and A-MSDU aggregation and 0.4 µs guardinterval supportFrequency range2.4 GHz 2.5 GHzProtocolsBluetooth v4.2 BR/EDR and BLE specificationNZIF receiver with –97 dBm sensitivityBluetoothRadioClass-1, class-2 and class-3 transmitterAFHAudioCVSD and SBCSD card, UART, SPI, SDIO, I2 C, LED PWM, MotorPWM, I2 S, IR, pulse counter, GPIO, capacitive touchModule interfacessensor, ADC, DAC, Two-Wire Automotive Interface(TWAI , compatible with ISO11898-1)On-chip sensorHall sensorIntegrated crystalHardwareIntegrated SPI flash40 MHz crystal14 MBOperating voltage/Power supply3.0 V 3.6 VOperating currentAverage: 80 mAMinimum current delivered by powersupplyRecommended operating temperaturerange 2Moisture sensitivity level (MSL)500 mA–40 C 85 CLevel 3Notice:1. ESP32-WROOM-32D and ESP32-WROOM-32U with 8 MB flash or 16 MB flash are available for custom order.2. ESP32-WROOM-32D and ESP32-WROOM-32U with high temperature range (–40 C 105 C) option are available for custom order. 4 MB SPI flash is supported on the high temperature range version.3. For detailed ordering information, please see Espressif Product Ordering Information.Espressif Systems7ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
2 Pin Definitions2 Pin Definitions2.1 Pin LayoutKeepout Zone1GNDGND3823V3IO23373ENIO22364SENSOR VPTXD0355SENSOR VNRXD0346IO34IO213339 D91831SD3IO1917IO32SD281632IO13NC15IO35GND7Figure 1: ESP32 WROOM 32D Pin Layout (Top View)Note:The pin layout of ESP32-WROOM-32U is the same as that of ESP32-WROOM-32D, except that ESP32-WROOM-32Uhas no keepout zone.2.2 Pin DescriptionThe ESP32-WROOM-32D and ESP32-WROOM-32U have 38 pins. See pin definitions in Table 3.Table 3: Pin r supplyEN3IModule-enable signal. Active high.SENSOR VP4IGPIO36, ADC1 CH0, RTC GPIO0SENSOR VN5IGPIO39, ADC1 CH3, RTC GPIO3IO346IGPIO34, ADC1 CH6, RTC GPIO4IO357IGPIO35, ADC1 CH7, RTC GPIO5Espressif Systems8ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
2 Pin 10I/OGPIO25, DAC 1, ADC2 CH8, RTC GPIO6, EMAC RXD0IO2611I/OGPIO26, DAC 2, ADC2 CH9, RTC GPIO7, EMAC RXD1IO2712I/OGPIO27, ADC2 CH7, TOUCH7, RTC GPIO17, EMAC RX IO9, SD DATA2, SPIHD, HS1 DATA2, U1RXDSWP/SD3*18I/OGPIO10, SD DATA3, SPIWP, HS1 DATA3, U1TXDSCS/CMD*19I/OGPIO11, SD CMD, SPICS0, HS1 CMD, U1RTSSCK/CLK*20I/OGPIO6, SD CLK, SPICLK, HS1 CLK, U1CTSSDO/SD0*21I/OGPIO7, SD DATA0, SPIQ, HS1 DATA0, U2RTSSDI/SD1*22I/OGPIO8, SD DATA1, SPID, HS1 DATA1, O16, HS1 DATA4, U2RXD, EMAC CLK OUTIO1728I/OGPIO17, HS1 DATA5, U2TXD, EMAC CLK OUT 180IO529I/OGPIO5, VSPICS0, HS1 DATA6, EMAC RX CLKIO1830I/OGPIO18, VSPICLK, HS1 DATA7IO1931I/OGPIO19, VSPIQ, U0CTS, EMAC TXD0NC32--IO2133I/OGPIO21, VSPIHD, EMAC TX ENRXD034I/OGPIO3, U0RXD, CLK OUT2TXD035I/OGPIO1, U0TXD, CLK OUT3, EMAC RXD2IO2236I/OGPIO22, VSPIWP, U0RTS, EMAC TXD1IO2337I/OGPIO23, VSPID, HS1 STROBEGND38PGroundGPIO32, XTAL 32K P (32.768 kHz crystal oscillator input), ADC1 CH4,TOUCH9, RTC GPIO9GPIO33, XTAL 32K N (32.768 kHz crystal oscillator output), ADC1 CH5,TOUCH8, RTC GPIO8GPIO14, ADC2 CH6, TOUCH6, RTC GPIO16, MTMS, HSPICLK, HS2 CLK,SD CLK, EMAC TXD2GPIO12, ADC2 CH5, TOUCH5, RTC GPIO15, MTDI, HSPIQ, HS2 DATA2,SD DATA2, EMAC TXD3GroundGPIO13, ADC2 CH4, TOUCH4, RTC GPIO14, MTCK, HSPID, HS2 DATA3,SD DATA3, EMAC RX ERGPIO15, ADC2 CH3, TOUCH3, MTDO, HSPICS0, RTC GPIO13, HS2 CMD,SD CMD, EMAC RXD3GPIO2, ADC2 CH2, TOUCH2, RTC GPIO12, HSPIWP, HS2 DATA0,SD DATA0GPIO0, ADC2 CH1, TOUCH1, RTC GPIO11, CLK OUT1, EMAC TX CLKGPIO4, ADC2 CH0, TOUCH0, RTC GPIO10, HSPIHD, HS2 DATA1,SD DATA1, EMAC TX ERNotice:* Pins SCK/CLK, SDO/SD0, SDI/SD1, SHD/SD2, SWP/SD3 and SCS/CMD, namely, GPIO6 to GPIO11 are connectedto the integrated SPI flash integrated on the module and are not recommended for other uses.Espressif Systems9ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
2 Pin Definitions2.3 Strapping PinsESP32 has five strapping pins, which can be seen in Chapter 6 Schematics: MTDI GPIO0 GPIO2 MTDO GPIO5Software can read the values of these five bits from register ”GPIO STRAPPING”.During the chip’s system reset release (power-on-reset, RTC watchdog reset and brownout reset), the latches ofthe strapping pins sample the voltage level as strapping bits of ”0” or ”1”, and hold these bits until the chip ispowered down or shut down. The strapping bits configure the device’s boot mode, the operating voltage ofVDD SDIO and other initial system settings.Each strapping pin is connected to its internal pull-up/pull-down during the chip reset. Consequently, if astrapping pin is unconnected or the connected external circuit is high-impedance, the internal weakpull-up/pull-down will determine the default input level of the strapping pins.To change the strapping bit values, users can apply the external pull-down/pull-up resistances, or use the hostMCU’s GPIOs to control the voltage level of these pins when powering on ESP32.After reset release, the strapping pins work as normal-function pins.Refer to Table 4 for a detailed boot-mode configuration by strapping pins.Table 4: Strapping PinsVoltage of Internal LDO (VDD SDIO)PinMTDIDefault3.3 V1.8 VPull-down01Booting ModePinDefaultSPI BootDownload ing/Disabling Debugging Log Print over U0TXD During BootingPinDefaultU0TXD ActiveU0TXD SilentMTDOPull-up10Timing of SDIO SlaveFE SamplingFE SamplingRE SamplingRE SamplingPinDefaultFE OutputRE OutputFE OutputRE OutputMTDOPull-up0011GPIO5Pull-up0101Espressif Systems10ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
2 Pin DefinitionsNote: Firmware can configure register bits to change the settings of ”Voltage of Internal LDO (VDD SDIO)” and ”Timingof SDIO Slave” after booting. Both ESP32-WROOM-32D and ESP32-WROOM-32U integrate a 3.3 V SPI flash, so the pin MTDI cannot be setto 1 when the modules are powered up.Espressif Systems11ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
3 Functional Description3 Functional DescriptionThis chapter describes the modules and functions integrated in ESP32-WROOM-32D andESP32-WROOM-32U.3.1 CPU and Internal MemoryESP32-D0WD contains a dual-core Xtensa 32-bit LX6 MCU. The internal memory includes: 448 KB of ROM for booting and core functions. 520 KB of on-chip SRAM for data and instructions. 8 KB of SRAM in RTC, which is called RTC FAST Memory and can be used for data storage; it is accessedby the main CPU during RTC Boot from the Deep-sleep mode. 8 KB of SRAM in RTC, which is called RTC SLOW Memory and can be accessed by the co-processorduring the Deep-sleep mode. 1 Kbit of eFuse: 256 bits are used for the system (MAC address and chip configuration) and the remaining768 bits are reserved for customer applications, including flash-encryption and chip-ID.3.2 External Flash and SRAMESP32 supports multiple external QSPI flash and SRAM chips. More details can be found in Chapter SPI in theESP32 Technical Reference Manual. ESP32 also supports hardware encryption/decryption based on AES toprotect developers’ programs and data in flash.ESP32 can access the external QSPI flash and SRAM through high-speed caches. The external flash can be mapped into CPU instruction memory space and read-only memory spacesimultaneously.– When external flash is mapped into CPU instruction memory space, up to 11 MB 248 KB can bemapped at a time. Note that if more than 3 MB 248 KB are mapped, cache performance will bereduced due to speculative reads by the CPU.– When external flash is mapped into read-only data memory space, up to 4 MB can be mapped at atime. 8-bit, 16-bit and 32-bit reads are supported. External SRAM can be mapped into CPU data memory space. Up to 4 MB can be mapped at a time.8-bit, 16-bit and 32-bit reads and writes are supported.Both ESP32-WROOM-32D and ESP32-WROOM-32U integrate a 4 MB of external SPI flash. The integrated SPIflash is connected to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and GPIO11. These six pins cannot be used asregular GPIOs.3.3 Crystal OscillatorsThe module uses a 40-MHz crystal oscillator.Espressif Systems12ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
3 Functional Description3.4 RTC and Low Power ManagementWith the use of advanced power-management technologies, ESP32 can switch between different powermodes.For details on ESP32’s power consumption in different power modes, please refer to section ”RTC andLow-Power Management” in ESP32 Datasheet.Espressif Systems13ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
4 Peripherals and Sensors4 Peripherals and SensorsPlease refer to Section Peripherals and Sensors in ESP32 Datasheet.Note:External connections can be made to any GPIO except for GPIOs in the range 6-11. These six GPIOs are connected tothe module’s integrated SPI flash. For details, please see Section 6 Schematics.Espressif Systems14ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
5 Electrical Characteristics5 Electrical Characteristics5.1 Absolute Maximum RatingsStresses beyond the absolute maximum ratings listed in Table 5 below may cause permanent damage to thedevice. These are stress ratings only, and do not refer to the functional operation of the device that should followthe recommended operating conditions.Table 5: Absolute Maximum RatingsSymbolParameterMinMaxUnitVDD33Power supply voltage–0.33.6VCumulative IO output current-1,100mAStorage temperature–40150 CIoutput1Tstore1. The module worked properly after a 24-hour test in ambient temperature at 25 C, and the IOs in three domains(VDD3P3 RTC, VDD3P3 CPU, VDD SDIO) output high logic level to ground. Please note that pins occupied by flashand/or PSRAM in the VDD SDIO power domain were excluded from the test.2. Please see Appendix IO MUX of ESP32 Datasheet for IO’s power domain.5.2 Recommended Operating ConditionsTable 6: Recommended Operating er supply voltage3.03.33.6VIV DDCurrent delivered by external power supply0.5--ATOperating temperature–40-85 C5.3 DC Characteristics (3.3 V, 25 C)Table 7: DC Characteristics (3.3 V, 25 C)SymbolCINVIHParameterMinPin capacitance-High-level input voltage0.75 VDD1TypMax2--UnitpF1VDD 0.3V1VILLow-level input voltage–0.3-0.25 VDDIIHHigh-level input current--50nAIILLow-level input current--50nAVOHHigh-level output voltage0.8 VDD1--VVOLLow-level output voltage--0.1 VDD1VVDD3P3 CPU power domain 1, 2-40-mA1, 2-40-mA-20-mAHigh-level source current1IOH(VDD 3.3 V, VOH 2.64 V,output drive strength set to themaximum)Espressif SystemsVDD3P3 RTC power domainVDD SDIO power domain 1,153ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation FeedbackV
5 Electrical ow-level sink currentIOL(VDD1 3.3 V, VOL 0.495 V,output drive strength set to the maximum)RP UResistance of internal pull-up resistor-45-kΩRP DResistance of internal pull-down resistor-45-kΩVIL nRSTLow-level input voltage of CHIP PU to power off the chip--0.6VNotes:1. Please see Appendix IO MUX of ESP32 Datasheet for IO’s power domain. VDD is the I/O voltage for a particular powerdomain of pins.2. For VDD3P3 CPU and VDD3P3 RTC power domain, per-pin current sourced in the same domain is gradually reducedfrom around 40 mA to around 29 mA, VOH 2.64 V, as the number of current-source pins increases.3. Pins occupied by flash and/or PSRAM in the VDD SDIO power domain were excluded from the test.5.4 Wi Fi RadioTable 8: Wi Fi Radio Operating frequency range note1-2412-2484MHzOutput impedance note2--note 2-ΩTX power note311n, MCS7121314dBm11b mode17.518.520dBm11b, 1 Mbps-–98-dBm11b, 11 Mbps-–89-dBm11g, 6 Mbps-–92-dBm11g, 54 Mbps-–74-dBm11n, HT20, MCS0-–91-dBm11n, HT20, MCS7-–71-dBm11n, HT40, MCS0-–89-dBm11n, HT40, MCS7-–69-dBm11g, 6 Mbps-31-dB11g, 54 Mbps-14-dB11n, HT20, MCS0-31-dB11n, HT20, MCS7-13-dBSensitivityAdjacent channel rejection1. Device should operate in the frequency range allocated by regional regulatory authorities. Target operating frequencyrange is configurable by software.2. For the modules that use IPEX antennas, the output impedance is 50 Ω. For other modules without IPEX antennas,users do not need to concern about the output impedance.3. Target TX power is configurable based on device or certification requirements.Espressif Systems16ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
5 Electrical Characteristics5.5 BLE Radio5.5.1 ReceiverTable 9: Receiver Characteristics – BLEParameterConditionsMinTypMaxUnitSensitivity @30.8% PER--–97-dBmMaximum received signal @30.8% PER-0--dBmCo-channel C/I-- 10-dBF F0 1 MHz-–5-dBF F0 – 1 MHz-–5-dBF F0 2 MHz-–25-dBF F0 – 2 MHz-–35-dBF F0 3 MHz-–25-dBF F0 – 3 MHz-–45-dB30 MHz 2000 MHz–10--dBm2000 MHz 2400 MHz–27--dBm2500 MHz 3000 MHz–27--dBm3000 MHz 12.5 GHz–10--dBm-–36--dBmAdjacent channel selectivity C/IOut-of-band blocking performanceIntermodulation5.5.2 TransmitterTable 10: Transmitter Characteristics – BLEParameterConditionsMinTypMaxUnitRF transmit power--0-dBmGain control step--3-dBmRF power control range-–12- 9dBmF F0 2 MHz-–52-dBmF F0 3 MHz-–58-dBmF F0 3 MHz-–60-dBm f 1avg---265kHz f 2max-247--kHz f 2avg / f 1avg--–0.92--ICFT--–10-kHzDrift rate--0.7-kHz/50 µsDrift--2-kHzAdjacent channel transmit powerEspressif Systems17ESP32-WROOM-32D & ESP32-WROOM-32U Datasheet v2.1Submit Documentation Feedback
5 Electrical CharacteristicsTemperature ( )5.6 Reflow ProfilePeak Temp.235 250 250Preheating zone150 200 60 120 s217200Reflow zone217 60 90 sCooling zone–1 –5 /sSoldering time 30 sRamp-up zone1 3 /s1005025Time (sec.)0050100150200250Ramp-up zone — Temp.: 25 150 Time: 60 90 s Ramp-up rate: 1 3 /sPreheating zone — Temp.: 150 200 Time: 60 120 sReflow zone — Temp.:
List of Tables 1 ESP32-WROOM-32D vs. ESP32-WROOM-32U 6 2 ESP32-WROOM-32D and ESP32-WROOM-32U
Figure 1: ESP32-WROOM-32D Pin Layout (Top View) Note: The pin layout of ESP32-WROOM-32U is the same as that of ESP32-WROOM-32D, except that ESP32-WROOM-32U has no keepout zone. 2.2 Pin Description The ESP32-WROOM-32D and ESP32-WROOM-32U have 38 pins. See pin definitions in Table 3. Table
ESP32-S2-WROOM and ESP32-S2-WROOM-I are two powerful, generic Wi-Fi MCU modules that have a rich set of peripherals. They are an ideal choice for a wide variety of application scenarios relating to Internet of Things (IoT), wearable electronics and smart home. ESP32-S2-WROOM comes with a PCB antenna, and
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The ESP32 strong series /strong of chips includes ESP32-D0WD-V3, ESP32-D0WDQ6-V3, ESP32-D0WD, ESP32-D0WDQ6, ESP32-D2WD, and ESP32-S0WD, among which, ESP32-D0WD-V3 and and ESP32-D0WDQ6-V3 are based on . strong Espressif /strong Systems 4 Submit Documentation Feedback ESP32 Datasheet V3.3. 1.Overview 1.6 Block Diagram Core and memory ROM Cryptographic hardware acceleration .
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The ESP32 board itself and a USB cable to connect it to the PC Espressif !1 /!8 2017.11! 2. Get Started on ESP-WROOM-32D 2. Get Started on ESP-WROOM-32D 2.1. Standard Setup of Toolchain for Linux The quickest way to start development with E
ESP32-C3-WROOM-02 and ESP32-C3-WROOM-02U are two general-purpose Wi-Fi and Bluetooth LE module. The rich set of peripherals and high performance make th
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