ESP32SOLO1
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Datasheet
Version v2.0
Espressif Systems
Copyright © 2022
www.espressif.com
Contents
1
Overview
4
2
Pin Definitions
6
2.1
Pin Layout
6
2.2
Pin Description
6
2.3
Strapping Pins
8
3
Functional Description
10
3.1
CPU and Internal Memory
10
3.2
External Flash and SRAM
10
3.3
Crystal Oscillators
10
3.4
RTC and Low-Power Management
11
4
Peripherals and Sensors
12
5
Electrical Characteristics
13
5.1
Absolute Maximum Ratings
13
5.2
Recommended Operating Conditions
13
5.3
DC Characteristics (3.3 V, 25 °C)
13
5.4
Wi-Fi Radio
14
5.5
Bluetooth LE Radio
15
5.5.1
Receiver
15
5.5.2
Transmitter
15
6
Schematics
16
7
Peripheral Schematics
17
8
Physical Dimensions
18
9
Recommended PCB Land Pattern
19
10 Product Handling
20
10.1
Storage Conditions
20
10.2
Electrostatic Discharge (ESD)
20
10.3
Reflow Profile
20
10.4
Ultrasonic Vibration
21
11 Related Documentation and Resources
22
Revision History
23
List of Tables
1
ESP32-SOLO-1 Ordering Information
4
2
ESP32-SOLO-1 Specifications
4
3
Pin Definitions
6
4
Strapping Pins
8
5
Description of ESP32 Power-up and Reset Timing Parameters
9
6
Absolute Maximum Ratings
13
7
Recommended Operating Conditions
13
8
DC Characteristics (3.3 V, 25 °C)
13
9
Wi-Fi Radio Characteristics
14
10
Receiver Characteristics – Bluetooth LE
15
11
Transmitter Characteristics – Bluetooth LE
15
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List of Figures
1
ESP32-SOLO-1 Pin Layout (Top View)
6
2
ESP32 Power-up and Reset Timing
9
3
ESP32-SOLO-1 Schematics
16
4
ESP32-SOLO-1 Peripheral Schematics
17
5
Physical Dimensions of ESP32-SOLO-1
18
6
Recommended PCB Land Pattern of ESP32-SOLO-1
19
7
Reflow Profile
20
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1 Overview
1 Overview
ESP32-SOLO-1 is a powerful, generic Wi-Fi + Bluetooth + Bluetooth LE MCU module that targets a wide variety
of applications, ranging from low-power sensor networks to the most demanding tasks, such as voice encoding,
music streaming and MP3 decoding.
Two different temperature variants of ESP32-SOLO-1 are available. Details are listed as follows:
Table 1: ESP32SOLO1 Ordering Information
Chip
Module
ESP32-SOLO-1
(Default Version)
ESP32-SOLO-1
(High Temp Version)
embed-
Recommended operating
Flash
Dimensions (mm)
–40 °C ~ +85 °C
4 MB
18 × 25.5 × 3.1
–40 °C ~ +105 °C
4 MB
18 × 25.5 × 3.1
ded
ambient temperature
ESP32-S0WD
ESP32-S0WD
For detailed ordering information, please see ESP Product Selector. The information in this datasheet is
applicable to both modules.
At the core of this module is the ESP32-S0WD chip. ESP32-S0WD is a member of the ESP32 family of chips,
which features a single core and contains all the peripherals of its dual-core counterparts. Available in a 5×5 mm
QFN, ESP32-S0WD offers great value for money, with its sustained performance when powering complex IoT
applications.
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 internet
through a Wi-Fi router, while using Bluetooth allows the user to conveniently connect to the phone or broadcast
low energy beacons for its detection. The sleep current of the ESP32 chip is less than 5 µA, making it suitable for
battery 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. Several peripherals facilitate
integration with other electronic devices. As such the chip does offer industry-leading specifications and
ultra-high 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 as
well. Secure (encrypted) over the air (OTA) upgrade is also supported, so that developers can upgrade their
products even after their release at minimum cost and effort.
Table 2 provides the specifications of ESP32-SOLO-1.
Table 2: ESP32SOLO1 Specifications
Categories
Certification
Items
Specifications
RF certification
See certificates for ESP32-SOLO-1
Wi-Fi certification
Wi-Fi Alliance
Green certification
RoHS/REACH
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ESP32-SOLO-1 Datasheet v2.0
1 Overview
Categories
Items
Specifications
Test
Reliablity
HTOL/HTSL/uHAST/TCT/ESD
802.11 b/g/n (802.11n up to 150 Mbps)
Wi-Fi
Protocols
A-MPDU and A-MSDU aggregation and 0.4 µs guard interval support
Center frequency range of operating channel
Protocols
2412 ~ 2484 MHz
Bluetooth v4.2 BR/EDR and Bluetooth LE specification
NZIF receiver with –97 dBm sensitivity
Bluetooth
Radio
Class-1, class-2 and class-3 transmitter
AFH
Audio
CVSD and SBC
SD card, UART, SPI, SDIO, I2C, LED PWM, Motor
PWM, I2S, IR, pulse counter, GPIO, capacitive touch sen-
Module interfaces
sor, ADC, DAC, Two-Wire Automotive Interface (TWAI® ),
compatible with ISO11898-1 (CAN Specification 2.0)
Hardware
On-chip sensor
Hall sensor
Integrated crystal
40 MHz crystal
Integrated SPI flash
4 MB
Operating voltage/Power supply
3.0 V ~ 3.6 V
Minimum current delivered by
power supply
Operating ambient temperature
range
500 mA
–40 °C ~ +85 °C or –40 °C ~ +105 °C
Package size
(18.00±0.10) mm × (25.50±0.10) mm × (3.10±0.10) mm
Moisture sensitivity level (MSL)
Level 3
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ESP32-SOLO-1 Datasheet v2.0
2 Pin Definitions
2 Pin Definitions
2.1 Pin Layout
Keepout Zone
1
GND
GND
38
2
3V3
IO23
37
3
EN
IO22
36
4
SENSOR_VP
TXD0
35
5
SENSOR_VN
RXD0
34
6
IO34
IO21
33
39 GND
12
IO27
IO16
27
13
IO14
IO4
26
14
IO12
IO0
25
24
28
IO2
IO17
23
IO26
IO15
11
22
29
SD1
IO5
21
IO25
SD0
10
20
30
CLK
IO18
19
IO33
CMD
9
18
31
SD3
IO19
17
IO32
SD2
8
16
32
IO13
NC
15
IO35
GND
7
Figure 1: ESP32SOLO1 Pin Layout (Top View)
2.2 Pin Description
ESP32-SOLO-1 has 38 pins. See pin definitions in Table 3.
Table 3: Pin Definitions
Name
No.
Type
Function
GND
1
P
Ground
3V3
2
P
Power supply
EN
3
I
Module-enable signal. Active high.
SENSOR_VP
4
I
GPIO36, ADC1_CH0, RTC_GPIO0
SENSOR_VN
5
I
GPIO39, ADC1_CH3, RTC_GPIO3
IO34
6
I
GPIO34, ADC1_CH6, RTC_GPIO4
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2 Pin Definitions
Name
No.
Type
Function
IO35
7
I
GPIO35, ADC1_CH7, RTC_GPIO5
IO32
8
I/O
IO33
9
I/O
IO25
10
I/O
GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6, EMAC_RXD0
IO26
11
I/O
GPIO26, DAC_2, ADC2_CH9, RTC_GPIO7, EMAC_RXD1
IO27
12
I/O
GPIO27, ADC2_CH7, TOUCH7, RTC_GPIO17, EMAC_RX_DV
IO14
13
I/O
IO12
14
I/O
GND
15
P
IO13
16
I/O
SHD/SD2*
17
I/O
GPIO9, SD_DATA2, SPIHD, HS1_DATA2, U1RXD
SWP/SD3*
18
I/O
GPIO10, SD_DATA3, SPIWP, HS1_DATA3, U1TXD
SCS/CMD*
19
I/O
GPIO11, SD_CMD, SPICS0, HS1_CMD, U1RTS
SCK/CLK*
20
I/O
GPIO6, SD_CLK, SPICLK, HS1_CLK, U1CTS
SDO/SD0*
21
I/O
GPIO7, SD_DATA0, SPIQ, HS1_DATA0, U2RTS
SDI/SD1*
22
I/O
GPIO8, SD_DATA1, SPID, HS1_DATA1, U2CTS
IO15
23
I/O
IO2
24
I/O
IO0
25
I/O
IO4
26
I/O
IO16
27
I/O
GPIO16, HS1_DATA4, U2RXD, EMAC_CLK_OUT
IO17
28
I/O
GPIO17, HS1_DATA5, U2TXD, EMAC_CLK_OUT_180
IO5
29
I/O
GPIO5, VSPICS0, HS1_DATA6, EMAC_RX_CLK
IO18
30
I/O
GPIO18, VSPICLK, HS1_DATA7
IO19
31
I/O
GPIO19, VSPIQ, U0CTS, EMAC_TXD0
NC
32
-
-
IO21
33
I/O
GPIO21, VSPIHD, EMAC_TX_EN
RXD0
34
I/O
GPIO3, U0RXD, CLK_OUT2
TXD0
35
I/O
GPIO1, U0TXD, CLK_OUT3, EMAC_RXD2
IO22
36
I/O
GPIO22, VSPIWP, U0RTS, EMAC_TXD1
IO23
37
I/O
GPIO23, VSPID, HS1_STROBE
GND
38
P
Ground
GPIO32, XTAL_32K_P (32.768 kHz crystal oscillator input), ADC1_CH4,
TOUCH9, RTC_GPIO9
GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5,
TOUCH8, RTC_GPIO8
GPIO14, ADC2_CH6, TOUCH6, RTC_GPIO16, MTMS, HSPICLK, HS2_CLK,
SD_CLK, EMAC_TXD2
GPIO12, ADC2_CH5, TOUCH5, RTC_GPIO15, MTDI, HSPIQ, HS2_DATA2,
SD_DATA2, EMAC_TXD3
Ground
GPIO13, ADC2_CH4, TOUCH4, RTC_GPIO14, MTCK, HSPID, HS2_DATA3,
SD_DATA3, EMAC_RX_ER
GPIO15, ADC2_CH3, TOUCH3, MTDO, HSPICS0, RTC_GPIO13, HS2_CMD,
SD_CMD, EMAC_RXD3
GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0,
SD_DATA0
GPIO0, ADC2_CH1, TOUCH1, RTC_GPIO11, CLK_OUT1, EMAC_TX_CLK
GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1,
SD_DATA1, EMAC_TX_ER
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ESP32-SOLO-1 Datasheet v2.0
2 Pin Definitions
Notice:
* Pins SCK/CLK, SDO/SD0, SDI/SD1, SHD/SD2, SWP/SD3 and SCS/CMD, namely, GPIO6 to GPIO11 are connected
to the integrated SPI flash integrated on the module and are not recommended for other uses.
2.3 Strapping Pins
ESP32 has five strapping pins, which can be seen in Chapter 6 Schematics:
• MTDI
• GPIO0
• GPIO2
• MTDO
• GPIO5
Software 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 of
the strapping pins sample the voltage level as strapping bits of ”0” or ”1”, and hold these bits until the chip is
powered down or shut down. The strapping bits configure the device’s boot mode, the operating voltage of
VDD_SDIO and other initial system settings.
Each strapping pin is connected to its internal pull-up/pull-down during the chip reset. Consequently, if a
strapping pin is unconnected or the connected external circuit is high-impedance, the internal weak
pull-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 host
MCU’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 Pins
Voltage of Internal LDO (VDD_SDIO)
Pin
MTDI
Default
3.3 V
1.8 V
Pull-down
0
1
Booting Mode
Pin
Default
SPI Boot
Download Boot
GPIO0
Pull-up
1
0
GPIO2
Pull-down
Don’t-care
0
Enabling/Disabling Debugging Log Print over U0TXD During Booting
Pin
Default
U0TXD Active
U0TXD Silent
MTDO
Pull-up
1
0
Timing of SDIO Slave
FE Sampling
FE Sampling
RE Sampling
RE Sampling
Pin
Default
FE Output
RE Output
FE Output
RE Output
MTDO
Pull-up
0
0
1
1
GPIO5
Pull-up
0
1
0
1
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2 Pin Definitions
Note:
• FE: falling-edge, RE: rising-edge.
• Firmware can configure register bits to change the settings of ”Voltage of Internal LDO (VDD_SDIO)” and ”Timing
of SDIO Slave” after booting.
The illustration below shows the ESP32 power-up and reset timing. Details about the parameters are listed in
Table 5.
t0
t1
VDD3P3_RTC Min
VDD
VIL_nRST
CHIP_PU
Figure 2: ESP32 Powerup and Reset Timing
Table 5: Description of ESP32 Powerup and Reset Timing Parameters
Parameters
t0
t1
Description
Time between the 3.3 V rails being brought up and CHIP_PU being
activated
Duration of CHIP_PU signal level < VIL_nRST (refer to its value in
Table 8 DC Characteristics) to reset the chip
Min.
Unit
50
µs
50
µs
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ESP32-SOLO-1 Datasheet v2.0
3 Functional Description
3 Functional Description
This chapter describes the modules and functions integrated in ESP32-SOLO-1.
3.1 CPU and Internal Memory
ESP32-S0WD contains one low-power Xtensa® 32-bit LX6 microprocessor. 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 accessed
by 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-processor
during the Deep-sleep mode.
• 1 Kbit of eFuse: 256 bits are used for the system (MAC address and chip configuration) and the remaining
768 bits are reserved for customer applications, including flash-encryption and chip-ID.
3.2 External Flash and SRAM
ESP32 supports multiple external QSPI flash and SRAM chips. More details can be found in Chapter SPI in the
ESP32 Technical Reference Manual. ESP32 also supports hardware encryption/decryption based on AES to
protect 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 space
simultaneously.
– When external flash is mapped into CPU instruction memory space, up to 11 MB + 248 KB can be
mapped at a time. Note that if more than 3 MB + 248 KB are mapped, cache performance will be
reduced 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 a
time. 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.
ESP32-SOLO-1 integrates a 4 MB SPI flash, which is connected to GPIO6, GPIO7, GPIO8, GPIO9, GPIO10 and
GPIO11. These six pins cannot be used as regular GPIOs.
3.3 Crystal Oscillators
The module uses a 40-MHz crystal oscillator.
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3 Functional Description
3.4 RTC and LowPower Management
With the use of advanced power-management technologies, ESP32 can switch between different power
modes.
For details on ESP32’s power consumption in different power modes, please refer to section ”RTC and
Low-Power Management” in ESP32 Datasheet.
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4 Peripherals and Sensors
4 Peripherals and Sensors
Please 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 to
the module’s integrated SPI flash. For details, please see Section 6 Schematics.
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ESP32-SOLO-1 Datasheet v2.0
5 Electrical Characteristics
5 Electrical Characteristics
5.1 Absolute Maximum Ratings
Stresses beyond the absolute maximum ratings listed in Table 6 below may cause permanent damage to the
device. These are stress ratings only, and do not refer to the functional operation of the device that should follow
the recommended operating conditions.
Table 6: Absolute Maximum Ratings
Symbol
Parameter
VDD33
Power supply voltage
Ioutput
1
Cumulative IO output current
Tstore
Storage temperature
Min
Max
Unit
–0.3
3.6
V
-
1,100
mA
–40
105
°C
1. 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 flash
and/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 Conditions
Table 7: Recommended Operating Conditions
Symbol
Parameter
Min
Typ
Max
Unit
VDD33
Power supply voltage
3.0
3.3
3.6
V
IV DD
Current delivered by external power supply
0.5
-
-
A
T
Operating ambient temperature
–40
-
85 or 105,
°C
depending on model
5.3 DC Characteristics (3.3 V, 25 °C)
Table 8: DC Characteristics (3.3 V, 25 °C)
Symbol
Parameter
Min
Typ
Max
Unit
-
2
-
CIN
Pin capacitance
VIH
High-level input voltage
0.75×VDD1
-
VDD1 +0.3
V
VIL
Low-level input voltage
–0.3
-
0.25×VDD1
V
IIH
High-level input current
-
-
50
nA
IIL
Low-level input current
-
-
50
nA
High-level output voltage
1
-
-
V
-
-
1
V
-
40
-
mA
-
40
-
mA
VOH
VOL
Low-level output voltage
High-level source current
1
(VDD = 3.3 V,
IOH
0.8×VDD
power domain 1,
2
VDD3P3_RTC
VOH >= 2.64 V,
output drive strength set
to the maximum)
Espressif Systems
VDD3P3_CPU
power domain 1,
2
0.1×VDD
pF
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5 Electrical Characteristics
Symbol
Parameter
Min
Typ
-
20
-
mA
-
28
-
mA
VDD_SDIO power
domain 1,
3
Max
Unit
Low-level sink current
IOL
(VDD1 = 3.3 V, VOL = 0.495 V,
output drive strength set to the maximum)
RP U
Resistance of internal pull-up resistor
-
45
-
kΩ
RP D
Resistance of internal pull-down resistor
-
45
-
kΩ
-
-
0.6
VIL_nRST
Low-level input voltage of CHIP_PU
to power off the chip
V
Notes:
1. Please see Appendix IO_MUX of ESP32 Datasheet for IO’s power domain. VDD is the I/O voltage for a particular power
domain of pins.
2. For VDD3P3_CPU and VDD3P3_RTC power domain, per-pin current sourced in the same domain is gradually reduced
from 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 WiFi Radio
Table 9: WiFi Radio Characteristics
Parameter
Center frequency range of operating channel
Condition
Min
Typical
Max
Unit
-
2412
-
2484
MHz
-
-
note 2
-
Ω
11n, MCS7
12
13
14
dBm
11b mode
17.5
18.5
20
dBm
11b, 1 Mbps
-
–98
-
dBm
11b, 11 Mbps
-
–89
-
dBm
11g, 6 Mbps
-
–92
-
dBm
11g, 54 Mbps
-
–74
-
dBm
11n, HT20, MCS0
-
–91
-
dBm
11n, HT20, MCS7
-
–71
-
dBm
11n, HT40, MCS0
-
–89
-
dBm
11n, HT40, MCS7
-
–69
-
dBm
11g, 6 Mbps
-
31
-
dB
11g, 54 Mbps
-
14
-
dB
11n, HT20, MCS0
-
31
-
dB
11n, HT20, MCS7
-
13
-
dB
note1
Output impedance note2
TX power note3
Sensitivity
Adjacent channel rejection
1. Device should operate in the center frequency range of operating channel allocated by regional regulatory authorities.
Target center frequency range of operating channel is configurable by software.
2. For the modules that use external antennas, the output impedance is 50 Ω. For other modules without external
antennas, users do not need to concern about the output impedance.
3. Target TX power is configurable based on device or certification requirements.
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5 Electrical Characteristics
5.5 Bluetooth LE Radio
5.5.1 Receiver
Table 10: Receiver Characteristics – Bluetooth LE
Parameter
Conditions
Min
Typ
Max
Sensitivity @30.8% PER
-
-
–97
-
dBm
Maximum received signal @30.8% PER
-
0
-
-
dBm
Co-channel C/I
-
-
+10
-
dB
F = F0 + 1 MHz
-
–5
-
dB
F = F0 – 1 MHz
-
–5
-
dB
F = F0 + 2 MHz
-
–25
-
dB
F = F0 – 2 MHz
-
–35
-
dB
F = F0 + 3 MHz
-
–25
-
dB
F = F0 – 3 MHz
-
–45
-
dB
30 MHz ~ 2000 MHz
–10
-
-
dBm
2000 MHz ~ 2400 MHz
–27
-
-
dBm
2500 MHz ~ 3000 MHz
–27
-
-
dBm
3000 MHz ~ 12.5 GHz
–10
-
-
dBm
-
–36
-
-
dBm
Unit
Adjacent channel selectivity C/I
Out-of-band blocking performance
Intermodulation
Unit
5.5.2 Transmitter
Table 11: Transmitter Characteristics – Bluetooth LE
Parameter
Conditions
Min
Typ
Max
RF transmit power
-
-
0
-
dBm
Gain control step
-
-
3
-
dB
RF power control range
-
–12
-
+9
dBm
F = F0 ± 2 MHz
-
–52
-
dBm
F = F0 ± 3 MHz
-
–58
-
dBm
F = F0 ± > 3 MHz
-
–60
-
dBm
∆ f 1avg
-
-
-
265
kHz
∆ f 2max
-
247
-
-
kHz
∆ f 2avg /∆ f 1avg
-
-
0.92
-
-
ICFT
-
-
–10
-
kHz
Drift rate
-
-
0.7
-
kHz/50 µs
Drift
-
-
2
-
kHz
Adjacent channel transmit power
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ESP32-SOLO-1 Datasheet v2.0
6 Schematics
Espressif Systems
6 Schematics
This is the reference design of the module.
The values of C1 and C2 vary with
the selection of the crystal.
Pin.1
GND
Pin.15
GND
The value of R2 varies with the actual
PCB board.
Pin.2
3V3
D1
LESD8D3.3CAT5G
C1
22pF/6.3V(10%)
1
GND
GND
C5
10nF/6.3V(10%)
20K(5%)
C6
ESP32-SOLO-1 Datasheet v2.0
C16
NC
C17
NC
GND
GND
SWP/SD3
U0TXD
3
CAP1
CAP2
VDDA
XTAL_P
XTAL_N
VDDA
GPIO21
U0TXD
U0RXD
GPIO22
49
Pin.34
U0RXD
SCS/CMD
Pin.20
CLK
U0RXD
Pin.33
IO21
SCK/CLK
GPIO21
GND
VDD33
C4
0.1uF
Pin.7
IO35
VDD_SDIO
GND
The values of C15, C14 and L4
vary with the actual PCB board.
VDDA
LNA_IN
VDD3P3
VDD3P3
SENSOR_VP
SENSOR_CAPP
SENSOR_CAPN
SENSOR_VN
CHIP_PU
VDET_1
VDET_2
32K_XP
32K_XN
GPIO25
U2
GPIO19
VDD3P3_CPU
GPIO23
GPIO18
GPIO5
SD_DATA_1
SD_DATA_0
SD_CLK
SD_CMD
SD_DATA_3
SD_DATA_2
GPIO17
VDD_SDIO
GPIO16
38
37
36
35
34
33
32
31
30
29
28
27
26
25
Pin.21
SD0
GPIO35
GPIO19
GPIO23
GPIO18
GPIO5
SDI/SD1
SDO/SD0
SCK/CLK
SCS/CMD
SWP/SD3
SHD/SD2
GPIO17
GPIO16
U3
SCS/CMD
1
SCK/CLK
6
SHD/SD2
7
Pin.8
IO32
8
1
2
3
4
SENSOR_VP 5
6
7
SENSOR_VN8
CHIP_PU
9
10
GPIO34
11
GPIO35
12
GPIO32
13
GPIO33
14
GPIO25
VCC
TBD
L4
TBD
Pin.6
IO34
/CS
CLK
/HOLD
FLASH
GND
C15
TBD
GPIO22
Pin.35
U0TXD
Pin.19
CMD
SENSOR_VN
GPIO21
U0TXD
U0RXD
GPIO22
499R
DI
DO
/WP
5
SDI/SD1
Pin.32
NC
SDO/SD0
2
SDO/SD0
3
SWP/SD3
GND
Pin.22
SD1
GPIO32
Pin.9
IO33
Pin.31
IO19
SDI/SD1
Pin.23
IO15
GPIO33
4
Not Recommended For New Designs (NRND)
PCB ANT
SHD/SD2
GND
Pin.10
IO25
GPIO19
Pin.30
IO18
GPIO15
Pin.24
IO2
GPIO25
GPIO18
Pin.29
IO5
GPIO2
GPIO5
VDD_SDIO
C18
1uF
Pin.11
IO26
ESP32-S0WD
GND
GPIO13
GPIO15
GPIO2
GPIO0
GPIO4
C14
GND
C21
NC
GPIO26
GPIO27
MTMS
MTDI
VDD3P3_RTC
MTCK
MTDO
GPIO2
GPIO0
GPIO4
1
2
GND
GPIO23
Pin.36
IO22
Pin.18
SD3
GPIO34
15
16
17
18
19
20
21
22
23
24
GND
C10
0.1uF
GPIO26
GPIO27
GPIO14
GPIO12
ANT1 GND
C13
10uF
2.0nH
GND
C12
NC
R3
48
47
46
45
44
43
42
41
40
39
GND
L5
GPIO13
SENSOR_VP
Pin.5
SENSOR_VN
3.3nF/6.3V(10%)
GND
C11
1uF
Pin.4
SENSOR_VP
GND
Pin.37
IO23
Pin.17
SD2
CHIP_PU
C2
22pF/6.3V(10%)
R2
C9
0.1uF
VDD33
GND
GND
40MHz+/-10ppm
R1
VDD33
Pin.16
IO13
GND
C20
1uF
100R
C3
100pF
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VDD33
Pin.3
CHIP_PU/EN
2
XIN
GND
U1
GND
VDD33
GND XOUT
4
GND
GND
Pin.38
GND
GND
VDD33
C19
0.1uF
Pin.28
IO17
GPIO26
GPIO17
Pin.12
IO27
Pin.27
IO16
GPIO27
GPIO16
GND
Pin.13
IO14
Pin.26
IO4
GPIO14
Pin.14
IO12
GPIO12
Figure 3: ESP32SOLO1 Schematics
GPIO4
Pin.39
GND
Pin.25
IO0
GND
GPIO0
7 Peripheral Schematics
5
4
3
2
7 Peripheral Schematics
This is the typical application circuit of the module connected with peripheral components (for example, power
supply, antenna, reset button, JTAG interface, and UART interface).
VDD33 VDD33
C1 10uF
C2 0.1uF
GND
GND
GND
C3
TBD
1
2
3
SENSOR_VP 4
SENSOR_VN 5
6
IO34
7
IO35
8
IO32
9
IO33
10
IO25
11
IO26
12
IO27
13
14
EN
GND1
3V3
EN
SENSOR_VP
SENSOR_VN
IO34
IO35
IO32
IO33
IO25
IO26
IO27
IO14
IO12
P_GND
GND3
IO23
IO22
TXD0
RXD0
IO21
NC
IO19
IO18
IO5
IO17
IO16
IO4
IO0
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
J1
IO23
IO22
TXD
RXD
IO21
1
2
GND
J2
15
16
17
18
19
20
21
22
23
24
U2
BOOT OPTION
R2
R3
R4
R5
100R
100R
100R
100R
MTMS
MTDI
MTCK
MTDO
IO2
GND
1
2
3
4
SD2
SD3
CMD
CLK
SD0
SD1
MTMS
MTDI
MTCK
MTDO
GND
IO19
IO18
IO5
IO17
IO16
IO4
IO0
GND2
IO13
SD2
SD3
CMD
CLK
SD0
SD1
IO15
IO2
GND
UART DOWNLOAD
U1
3
2
1
R1
TBD
JTAG
MTDI should be kept at a low electric level when powering up the module.
Figure 4: ESP32SOLO1 Peripheral Schematics
Note:
Espressif Systems
Title
Application of ESP32-WROOM-32
• Soldering Pad 39 to the Ground of the base board is not necessary for a satisfactory thermal performance. If users
do want to solder it, they need to ensure that the correct quantity of soldering paste is applied.
Size
A4
Date:
5
Document Number
Wednesday, August 07, 2019
4
• To ensure the power supply
to the ESP32 chip during power-up,3it is advised to add an RC delay circuit2 at the EN pin.
The recommended setting for the RC delay circuit is usually R = 10 kΩ and C = 1 µF. However, specific parameters
should be adjusted based on the power-up timing of the module and the power-up and reset sequence timing
of the chip. For ESP32’s power-up and reset sequence timing diagram, please refer to Section Power Scheme in
ESP32 Datasheet.
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ESP32-SOLO-1 Datasheet v2.0
She
8 Physical Dimensions
8 Physical Dimensions
Unit: mm
6.19
0.85
0.80
0
Ø0.5
10.50
10.29
0.90
1.27
15.80
1.50
3.60
3.60
0.1
17.60
0.90
16.51
25.50±0.15
0.45
0.90
6.19
3.10±0.15
1.05
0.85
8.89
11.43
18.00±0.15
Top View
Side View
Bottom View
Figure 5: Physical Dimensions of ESP32SOLO1
Note:
For information about tape, reel, and product marking, please refer to Espressif Module Package Information.
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ESP32-SOLO-1 Datasheet v2.0
9 Recommended PCB Land Pattern
9 Recommended PCB Land Pattern
Unit: mm
Via for thermal pad
Copper
6.19
18.00
Antenna Area
38x1.50
3.70
0.90
0.50
16.51
14 15
0.50
1.50
7.50
38
10.29
0.50
0.90
3.70
1.27
1.50
25.50
38x0.90
1
24 25
1.27
0.50
11.43
3.28
Figure 6: Recommended PCB Land Pattern of ESP32SOLO1
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ESP32-SOLO-1 Datasheet v2.0
10 Product Handling
10
Product Handling
10.1
Storage Conditions
The products sealed in moisture barrier bags (MBB) should be stored in a non-condensing atmospheric
environment of < 40 °C and 90%RH. The module is rated at the moisture sensitivity level (MSL) of 3.
After unpacking, the module must be soldered within 168 hours with the factory conditions 25 ± 5 °C and 60
%RH. If the above conditions are not met, the module needs to be baked.
10.2
Electrostatic Discharge (ESD)
• Human body model (HBM): ±2000 V
• Charged-device model (CDM): ±500 V
10.3
Reflow Profile
Temperature (℃)
Solder the module in a single reflow.
Peak Temp.
235 ~ 250 ℃
250
Preheating zone
150 ~ 200 ℃
60 ~ 120 s
217
200
Reflow zone
217 ℃ 60 ~ 90 s
Cooling zone
–1 ~ –5 ℃/s
Soldering time
> 30 s
Ramp-up zone
1 ~ 3 ℃/s
100
50
25
Time (sec.)
0
0
50
100
150
200
250
Ramp-up zone — Temp.: 25 ~ 150 ℃ Time: 60 ~ 90 s Ramp-up rate: 1 ~ 3 ℃/s
Preheating zone — Temp.: 150 ~ 200 ℃ Time: 60 ~ 120 s
Reflow zone — Temp.: >217 ℃
60 ~ 90 s; Peak Temp.: 235 ~ 250 ℃ Time: 30 ~ 70 s
Cooling zone — Peak Temp. ~ 180 ℃ Ramp-down rate: –1 ~ –5 ℃/s
Solder — Sn-Ag-Cu (SAC305) lead-free solder alloy
Figure 7: Reflow Profile
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ESP32-SOLO-1 Datasheet v2.0
10 Product Handling
10.4
Ultrasonic Vibration
Avoid exposing Espressif modules to vibration from ultrasonic equipment, such as ultrasonic welders or
ultrasonic cleaners. This vibration may induce resonance in the in-module crystal and lead to its malfunction or
even failure. As a consequence, the module may stop working or its performance may deteriorate.
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ESP32-SOLO-1 Datasheet v2.0
11 Related Documentation and Resources
11
Related Documentation and Resources
Related Documentation
• ESP32 Series Datasheet – Specifications of the ESP32 hardware.
• ESP32 Technical Reference Manual – Detailed information on how to use the ESP32 memory and peripherals.
• ESP32 Hardware Design Guidelines – Guidelines on how to integrate the ESP32 into your hardware product.
• ESP32 ECO and Workarounds for Bugs – Correction of ESP32 design errors.
• Certificates
https://espressif.com/en/support/documents/certificates
• ESP32 Product/Process Change Notifications (PCN)
https://espressif.com/en/support/documents/pcns
• ESP32 Advisories – Information on security, bugs, compatibility, component reliability.
https://espressif.com/en/support/documents/advisories
• Documentation Updates and Update Notification Subscription
https://espressif.com/en/support/download/documents
Developer Zone
• ESP-IDF Programming Guide for ESP32 – Extensive documentation for the ESP-IDF development framework.
• ESP-IDF and other development frameworks on GitHub.
https://github.com/espressif
• ESP32 BBS Forum – Engineer-to-Engineer (E2E) Community for Espressif products where you can post questions,
share knowledge, explore ideas, and help solve problems with fellow engineers.
https://esp32.com/
• The ESP Journal – Best Practices, Articles, and Notes from Espressif folks.
https://blog.espressif.com/
• See the tabs SDKs and Demos, Apps, Tools, AT Firmware.
https://espressif.com/en/support/download/sdks-demos
Products
• ESP32 Series SoCs – Browse through all ESP32 SoCs.
https://espressif.com/en/products/socs?id=ESP32
• ESP32 Series Modules – Browse through all ESP32-based modules.
https://espressif.com/en/products/modules?id=ESP32
• ESP32 Series DevKits – Browse through all ESP32-based devkits.
https://espressif.com/en/products/devkits?id=ESP32
• ESP Product Selector – Find an Espressif hardware product suitable for your needs by comparing or applying filters.
https://products.espressif.com/#/product-selector?language=en
Contact Us
• See the tabs Sales Questions, Technical Enquiries, Circuit Schematic & PCB Design Review, Get Samples
(Online stores), Become Our Supplier, Comments & Suggestions.
https://espressif.com/en/contact-us/sales-questions
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ESP32-SOLO-1 Datasheet v2.0
Revision History
Revision History
Date
Version
2022-07-07
v2.0
Release notes
Added Section 10: Product Handling
Added Figure 2 and Table 5 in Section 2.3: Strapping Pins
Added a label of (Not Recommended For New Designs) to this document
Updated Table 1
Added a link to RF certificates in Table 2
Updated Table 6
2022-03-04
v1.9
Added a note below Figure 5
Added Section 11: Related Documentation and Resources
Replaced Espressif Product Ordering Information with ESP Product
Selector
Updated Figure 5: Physical Dimensions of ESP32-SOLO-1 and Figure 6:
2021-02-04
V1.8
Recommended PCB Land Pattern of ESP32-SOLO-1.
Modified the note below Figure 7: Reflow Profile.
Updated the trade mark from TWAI™ to TWAI® .
Added TWAITM in Table 2;
Updated Figure 7 and added a note under it;
2020-11-27
V1.7
Added notes about schematics and peripheral schematics;
Fixed some typos;
Updated the C value in RC delay circuit from 0.1 µF to 1 µF;
Provided feedback link.
Changed the supply voltage range from 2.7 V ~ 3.6 V to 3.0 V ~ 3.6 V;
2019.09
V1.6
Updated Section 7 Peripheral Schematics and added a note about RC
delay circuit under it;
Updated Figure 9 Recommended PCB Land Pattern.
Added a new variant with high temperature range (–40 °C ~ +105 °C) in
Chapter 1 Overview;
2019.07
V1.5
Added Moisture sensitivity level (MSL) 3 in Table 2 ESP32-SOLO-1 Specifications;
Added notes about ”Operating frequency range” and ”TX power” under
Table 9 Wi-Fi Radio Characteristics.
2019.01
V1.4
Changed the RF power control range in Table 11 from –12 ~ +12 to –12
~ +9 dBm.
• Updated the descriptions of pins IO16 and IO17 in Table 3: Pin Definitions;
2018.09
V1.3
• Added ”Cumulative IO output current” entry to Table 6: Absolute
Maximum Ratings;
• Added more parameters to Table 8: DC Characteristics.
2018.09
V1.2
Updated the hole diameter in the shield from 1.00 mm to 0.50 mm, in
Figure 5. Added RoHS certification.
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ESP32-SOLO-1 Datasheet v2.0
Revision History
Date
Version
Release notes
• Added certifications and reliability test items the module has passed
in Table 2: ESP32-SOLO-1 Specifications, and removed softwarespecific information;
• Updated section 3.4: RTC and Low-Power Management;
2018.08
V1.1
• Changed the modules’ dimensions from (18±0.2) mm x (25.5 ±0.2)
mm x (3.1±0.15) mm to (18.00±0.10) mm x (25.50±0.10) mm x
(3.10±0.10) mm;
• Updated Table 9: Wi-Fi Radio;
• Updated Figure 8: Physical Dimensions.
2018.06
V1.0
First release.
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ESP32-SOLO-1 Datasheet v2.0
Disclaimer and Copyright Notice
Information in this document, including URL references, is subject to change without notice.
ALL THIRD PARTY’S INFORMATION IN THIS DOCUMENT IS PROVIDED AS IS WITH NO
WARRANTIES TO ITS AUTHENTICITY AND ACCURACY.
NO WARRANTY IS PROVIDED TO THIS DOCUMENT FOR ITS MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, NOR DOES ANY WARRANTY
OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.
All liability, including liability for infringement of any proprietary rights, relating to use of information
in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any
intellectual property rights are granted herein.
The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a
registered trademark of Bluetooth SIG.
www.espressif.com
All trade names, trademarks and registered trademarks mentioned in this document are property
of their respective owners, and are hereby acknowledged.
Copyright © 2022 Espressif Systems (Shanghai) Co., Ltd. All rights reserved.
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