ESP-12K Specification V1.0
ESP-12K SPECIFICATION
Version V1.0
Copyright ©2019
Copyright © 2019 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved
I
ESP-12K Specification V1.0
Disclaimer and copyright notice
The information in this article, including the URL for reference, is subject to change
without notice.
The document is provided "as is" without any guarantee responsibility, including any
guarantee of marketability, suitability for a specific purpose or non-infringement, and
any guarantee mentioned elsewhere in any proposal, specification or sample. This
document assumes no responsibility, including any liability for infringement of any
patent rights arising from the use of the information in this document. This document
does not grant any license to use intellectual property rights, whether express or
implied, by estoppel or other means.
The test data obtained in this article are all obtained by Enxin Lab's laboratory tests,
and the actual results may be slightly different.
The Wi-Fi Alliance member logo is owned by the Wi-Fi Alliance.
All trademark names, trademarks and registered trademarks mentioned in this article
are the property of their respective owners and are hereby declared.
The final interpretation right belongs to Shenzhen Anxinke Technology Co., Ltd.
Notice
The contents of this manual may change due to product version upgrade or other
reasons. Shenzhen Anxinke Technology Co., Ltd. reserves the right to modify the
contents of this manual without any notice or prompt. This manual is only used as a
guide. Shenzhen Anxinke Technology Co., Ltd. makes every effort to provide accurate
information in this manual, but Shenzhen Anxinke Technology Co., Ltd. does not
guarantee that
the manual are completely error-free. And the
suggestion does not constitute any express or implied guarantee.
the contents of
Copyright © 2019 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved
II
Formulation / Revision / Abolition of CV
Version
Date
Formulation / Revision
Verify
V1.0
2020.04.10 First formulated
Make
Yiji Xie
ESP-12K Specification V1.0
Copyright © 2019 Shenzhen Ai-Thinker Technology Co., Ltd All Rights Reserved
III
ESP-12K Specification V1.0
CONTENT
1.PRODUCT DESCRIPTION..........................................................................................................................V
2.ELECTRICAL PARAMETER.......................................................................................................................IX
3.DIMENSION...................................................................................................................................................XI
4.PIN DEFINITION..........................................................................................................................................XII
5.SCHEMATIC DIAGRAM............................................................................................................................. XV
6.DESIGN GUIDE.......................................................................................................................................... XVI
7.PACKAGING................................................................................................................................................XIX
8.CONTACT US..............................................................................................................................................XIX
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IV
ESP-12K Specification V1.0
1.PRODUCT DESCRIPTION
ESP-12K is a Wi-Fi module developed by Ensink Technology. The core processor
ESP32-S2 of this module is a highly integrated low-power Wi-Fi system-on-chip (SoC)
designed for the Internet of Things (IoT) , Mobile devices, wearable electronic devices,
smart home and other applications. ESP32-S2 has industry-leading low-power
performance and RF performance, supports IEEE802.11b / g / n protocol, integrates
Wi-Fi MAC, Wi-Fi RF and baseband, RF switch, RF Balun, power amplifier, low noise
Amplifier, etc.
The ESP32-S2 chip is equipped with Xtensa® 32-bit LX7 single-core processor, and its
operating frequency is up to 240 MHz. The chip supports secondary development
without the use of other microcontrollers or processors. The chip has 320 KB SRAM
and 128 KB ROM, and can be connected to flash and RAM through SPI / QSPI / OSPI
and other interfaces. ESP32-S2 supports a variety of low-power operating states to
meet
the power consumption requirements of various application scenarios. The
unique fine clock gating function, dynamic voltage clock frequency adjustment function,
and RF output power adjustable function of the chip can achieve the best balance
between communication distance, communication rate and power consumption.
ESP32-S2 provides a wealth of peripheral interfaces, including SPI, I2S, UART, I2C,
LED PWM, LCD interface, Camera interface, ADC, DAC, touch sensor, temperature
sensor and up to 43 GPIO.It supports the expansion of PSRAM on the periphery of the
chip, and the ESP-12K module can be equipped with PSRAM. In addition, it includes a
full-speed USB On-The-Go (OTG)
interface that can support
the use of USB
communication.
ESP32-S2 has a variety of unique hardware security mechanisms. The hardware
encryption accelerator supports AES, SHA, and RSA algorithms. The RNG, HMAC and
Digital Signature (Digital Signature) modules provide more security features. Other
security features include flash encryption and secure boot (se-cure boot) signature
verification. The perfect security mechanism enables the chip to be perfectly applied to
various encryption products.
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V
ESP-12K Specification V1.0
Features
SRAM
Complete 802.11b / g / n Wi-Fi SoC module, data rate up to 150Mbps
Built-in ESP32-S2 chip, Xtensa® single-core 32-bit LX7 microprocessor, support
up to 240 MHz clock frequency, with 128KB ROM, 320KB SRAM, 16KB RTC
Support UART / GPIO / ADC / PWM / SPI / I2C / LCD / I2S / Camera / IR / USB /
DAC interface, support touch sensor, temperature sensor, pulse counter
SMD-42 packaging
Integrate Wi-Fi MAC/ BB/RF/PA/LNA
Support multiple sleep modes, deep sleep current is less than10uA
Serial port speed up to4Mbps
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VI
ESP-12K Specification V1.0
Built-in Lwip protocol stack
Support STA/AP/STA+AP work mode
Smart Config (APP) / AirKiss (WeChat) one-click distribution network supporting
Android and IOS
Support serial local upgrade and remote firmware upgrade (FOTA)
General AT command can be used quickly
Support secondary development, integrated Windows, Linux development
environment
About PSRAM:
ESP-12K supports optional PSRAM, the default 2 kinds of PSRAM configuration,
the shield can be distinguished on the silk screen. For details, please refer to the
product appearance drawing.
ESP-12K(00) without PSRAM
ESP-12K(08) configuration 8MByte PSRAM
Main parameter
List 1 Main parameter
Model Name
ESP-12K
Packaging
SMD-42
Size
Antenna
31.0*18.0*3.0(±0.2)MM
PCB antenna/IPEX connector
Spectrum range
2400 ~ 2483.5MHz
Work
Temperature
Storage
environment
Power
Range
Supply
-40 ℃ ~ 85 ℃
-40 ℃ ~ 125 ℃ , < 90%RH
Voltage 3.0V ~ 3.6V，Current >500mA
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VII
Interface
UART/GPIO/ADC/PWM/SPI/I2C/LCD/I2S/Camera/IR/USB/DA
C
ESP-12K Specification V1.0
IO port qty
37
Serial rate
Safety
Support 110 ~ 4608000 bps ，default 115200 bps
WEP/WPA-PSK/WPA2-PSK
SPI Flash
Default 32Mbit
PSRAM
Optional without PSRAM or 8MByte PSRAM
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VIII
ESP-12K Specification V1.0
2.ELECTRICAL PARAMETER
Parameter
Condition
Min
Typical
Max
Unit
Voltage
VDD
3.0
3.3
3.6
-0.3/0.75VIO
N/0.8VIO
-
-
-
-
V
V
V
0.25VIO/3.6
0.1VIO/N
12
mA
I/O
VOL/VOH
VIL/VIH
IMAX
-
-
-
RF performance
Description
Work frequency
Typical
2400 - 2483.5
Output power
In 11n mode HT40，PA output
power is
In 11n mode HT20，PA output
power is
In 11g mode，PA output power is
In 11b mode，PA output power is
CCK, 1 Mbps
CCK, 11 Mbps
6 Mbps (1/2 BPSK)
54 Mbps (3/4 64-QAM)
HT20 (MCS7)
HT40 (MCS7)
Receive sensitivity
12±2
13±2
14±2
16±2
＜＝-96
＜＝-88
＜＝-91
＜＝-74
＜＝-71
＜＝-68
Unit
MHz
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
dBm
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IX
ESP-12K Specification V1.0
Power consumption
The following power consumption data is based on a 3.3V power supply, an ambient
temperature of 25 ° C, and is measured using an internal voltage regulator.
All measurements are done at the antenna interface without SAW filters.
All transmission data is based on a 90% duty cycle, measured in
continuous transmission mode.
Mode
Mix
Typical
Max
Send 802.11b, CCK 11Mbps,
POUT=+17dBm
Send 802.11g, OFDM 54Mbps,
POUT =+15dBm
Send 802.11n, MCS7, POUT
=+13dBm
Receive 802.11b,package length
1024bit, -80dBm
Receive 802.11g, package length
1024, -70dBm
Receive 802.11n,package length
1024bit, -65dBm
Modem-Sleep①
Light-Sleep②
Deep-Sleep③
Power Off
-
-
-
-
-
-
-
-
-
-
190
145
120
63
63
68
20
1.4
20
0.5
Unit
mA
mA
mA
mA
mA
mA
mA
mA
μA
μA
-
-
-
-
-
-
-
-
-
-
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X
3.DIMENSION
ESP-12K（00）
ESP-12K Specification V1.0
ESP-12K（08）
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XI
4.PIN DEFINITION
The ESP-12K module has a total of 42 interfaces, such as the pin diagram, the pin
function definition table is the interface definition
ESP-12K Specification V1.0
ESP-12K PIN definition diagram
List PIN function definition
No.
item
Function Description
1
2
3
4
5
6
7
8
9
GND
ground
VCC
Power supply
RTC_GPIO0, GPIO0
IO0
IO1
IO2
IO3
IO4
IO5
IO6
RTC_GPIO1, GPIO1, TOUCH1, ADC1_CH0
RTC_GPIO2, GPIO2, TOUCH2, ADC1_CH1
RTC_GPIO3, GPIO3, TOUCH3, ADC1_CH2
RTC_GPIO4, GPIO4, TOUCH4, ADC1_CH3
RTC_GPIO5, GPIO5, TOUCH5, ADC1_CH4
RTC_GPIO6, GPIO6, TOUCH6, ADC1_CH5
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ESP-12K Specification V1.0
RTC_GPIO7, GPIO7, TOUCH7, ADC1_CH6
RTC_GPIO8, GPIO8, TOUCH8, ADC1_CH7
RTC_GPIO9, GPIO9, TOUCH9, ADC1_CH8, FSPIHD
RTC_GPIO10,
FSPICS0, FSPIIO4
GPIO10,
TOUCH10,
ADC1_CH9,
RTC_GPIO11, GPIO11, TOUCH11, ADC2_CH0, FSPID,
FSPIIO5
RTC_GPIO12,
FSPICLK, FSPIIO6
GPIO12,
TOUCH12,
ADC2_CH1,
RTC_GPIO13, GPIO13, TOUCH13, ADC2_CH2, FSPIQ,
FSPIIO7
RTC_GPIO14, GPIO14, TOUCH14, ADC2_CH3, FSPIWP,
FSPIDQS
GPIO15,
U0RTS,
ADC2_CH4,
GPIO16,
U0CTS,
ADC2_CH5,
RTC_GPIO15,
XTAL_32K_P
RTC_GPIO16,
XTAL_32K_N
IO17
RTC_GPIO17, GPIO17, U1TXD, ADC2_CH6, DAC_1
RTC_GPIO18, GPIO18, U1RXD, ADC2_CH7, DAC_2,
CLK_OUT3
RTC_GPIO19, GPIO19, U1RTS, ADC2_CH8, CLK_OUT2,
USB_D-
RTC_GPIO20, GPIO20, U1CTS, ADC2_CH9, CLK_OUT1,
USB_D+
IO7
IO8
IO9
IO10
IO11
IO12
IO13
IO14
IO15
IO16
IO18
IO19
IO20
IO21
RTC_GPIO21, GPIO21
IO26
SPICS1, GPIO26
GND
接地
IO33
SPIIO4, GPIO33, FSPIHD
IO34
SPIIO5, GPIO34, FSPICS0
IO35
SPIIO6, GPIO35, FSPID
IO36
SPIIO7, GPIO36, FSPICLK
IO37
SPIDQS, GPIO37, FSPIQ
IO38
GPIO38, FSPIWP
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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XIII
ESP-12K Specification V1.0
33
34
35
36
37
38
39
40
41
42
IO39
MTCK, GPIO39, CLK_OUT3
IO40
MTDO, GPIO40, CLK_OUT2
IO41
MTDI, GPIO41, CLK_OUT1
IO42
MTMS, GPIO42
U0TX
U0TXD, GPIO43, CLK_OUT1
U0RX
U0RXD, GPIO44, CLK_OUT2
IO45
GPIO45
IO46
GPIO46
EN
High level: chip enable;
Low level: the chip is off;
Has been raised by default.
GND
Ground
List Module startup mode description
System startup mode
Pin
IO0
IO46
Default
Pull up
Pull down
Irrelevant
1
0
0
SPI startup mode
Download startup
mode
Note: Some pins have been pulled up internally, please refer to the schematic
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XIV
5.SCHEMATIC DIAGRAM
ESP-12K Specification V1.0
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XV
6.DESIGN GUIDE
1、Application circuit
ESP-12K Specification V1.0
note:
(1) The RC delay circuit needs to be added to the EN pin. It is recommended that
R = 10kΩ and C = 0.1μF;
(2) GPIO18 as U1RXD needs to add a pull-up resistor externally.
2、Antenna layout requirements
(1) The following two methods are recommended for the installation location on
the motherboard:
Option 1: Place the module on the edge of the main board, and the antenna area
protrudes from the edge of the main board.
Option 2: Place the module on the edge of the motherboard, and the edge of the
motherboard digs out an area at the position of the antenna.
(2) In order to meet the performance of the onboard antenna, it is forbidden to
place metal parts around the antenna, away from high-frequency devices.
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XVI
ESP-12K Specification V1.0
3、Power supply
(1) 3.3V voltage is recommended, the peak current is more than 500mA
(2) It is recommended to use LDO for power supply; if using DC-DC, it is recommended
to control the ripple within 30mV.
(3) It is recommended to reserve the position of the dynamic response capacitor in the
DC-DC power supply circuit, which can optimize the output ripple when the load
changes greatly.
(4), 3.3V power interface is recommended to add ESD
devices.
4、Use of GPIO port
(1) Some GPIO ports are led out of the periphery of the module. If you need to use a
10-100 ohm resistor in series with the IO port. This can suppress overshoot, and the
level on both sides is more stable. Helps both EMI and ESD.
(2) For the up and down of the special IO port, please refer to the instruction manual of
the specification, which will affect the startup configuration of the module.
(3) The IO port of the module is 3.3V. If the IO level of the main control and the module
does not match, a level conversion circuit needs to be added.
(4) If the IO port is directly connected to the peripheral interface, or the pin header and
other terminals, it is recommended to reserve ESD devices near the terminal of the IO
trace.
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XVII
ESP-12K Specification V1.0
Pic Level shift circuit
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XVIII
7.PACKAGING
As shown below, the packaging of ESP-12K is taping.
ESP-12K Specification V1.0
8.CONTACT US
Website：https://www.ai-thinker.com
Development DOCS：https://docs.ai-thinker.com
Official forum：http://bbs.ai-thinker.com
Sample purchase：https://aithinker.onesite.alibaba.com/
Business：sales@aithinker.com
Technical support：support@aithinker.com
Add：408-410, Block C, Huafeng Smart Innovation Port, Gushu 2nd Road, Xixiang, Baoan District, Shenzhen
Tel：0755-29162996
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XIX
Integration instructions for host product manufacturers according to KDB 996369 D03 OEM Manual v01
2.2 List of applicable FCC rules
The ESP-12K is an Wi-Fi Module with digitally modulated systems using an DSSS with DBPSK/DQPSK/CCK for
802.11b; OFDM with BPSK/QPSK/16QAM/64QAM for 802.11g/n; modulation. It operates on the 2400-2483.5MHz
band and, therefore, is within U.S. FCC part 15.247 standard
2.3 Specific operational use conditions
The EUT is a Wi-Fi Module
Operation Frequency: 2412-2462MHz for 802.11b/g/11n(HT20); 2422-2452MHz for 802.11n(HT40);
Modulation Type: DSSS with DBPSK/DQPSK/CCK for 802.11b;
OFDM with BPSK/QPSK/16QAM/64QAM for 802.11g/n;
Number Of Channel: 11 channels for 802.11b/g/11n(HT20); 7 channels for 802.11n(HT40);
Antenna Designation: PCB Antenna
Antenna Gain: 3.0dBi
ESP-12K is a Wi-Fi module developed by Ensink Technology. The core processor ESP32-S2 of this module is a
highly integrated low-power Wi-Fi system-on-chip (SoC) designed for the Internet of Things (IoT) , Mobile devices,
wearable electronic devices, smart home and other applications. ESP32-S2 has industry-leading low-power
performance and RF performance, supports IEEE802.11b / g / n protocol, integrates Wi-Fi MAC, Wi-Fi RF and
baseband, RF switch, RF Balun, power amplifier, low noise Amplifier, etc.
2.4 Limited module procedures
not applicable; Single Modular Approval Request
2.5 Trace antenna designs
Not applicable;
2.6 RF exposure considerations
To maintain compliance with FCC’s RF Exposure guidelines, This equipment should be installed and
operated with minimum distance between 20cm the radiator your body: Use only the supplied antenna.
2.7 Antennas
The ESP-12K is an Wi-Fi Module beams signals and communicates with its antenna, which is PCB
Antenna. The PCB Antenna gain is 3.0dBi. Antenna could not be in no-load state when module is
working. During debugging, it is suggested to add 50 ohms load to the antenna port to avoid damage
or performance degradation of the module under long-time no-load condition.
2.8 Label and compliance information
The final end product must be label in a visible area with the following
Host must Contains FCC ID: 2ATPO-ESP-12K. If the size of the end product is larger than 8x10cm, then
the following FCC part 15.19 statement has to also be available on the label: This device complies
with Part 15 of FCC rules. Operation is subject to the following two conditions:
(1) this device may not cause harmful interference and
(2) this device must accept any interference received, including interference that may cause undesired operation.
2.9 Information on test modes and additional testing requirements
Data transfer module demo board can control the EUT work in RF test mode at specified test channel.
2.10 Additional testing, Part 15 Subpart B disclaimer
The module without unintentional-radiator digital circuit, so the module does not required an evaluation
by FCC Part 15 Subpart B. The host should be evaluated by the FCC Subpart B.
ATTENTION
This device is intended only for OEM integrators under the following conditions:
1) The antenna must be installed such that 20 cm is maintained between the antenna and users, and
2) This device and its antenna(s) must not be co‐located with any other transmitters except in
accordance with FCC multi‐transmitter product procedures. Referring to the multi‐transmitter policy,
multiple transmitter(s) and module(s) can be operated simultaneously without C2P.
3) For all products market in US, OEM has to limit the Operating Frequency: 2412-2462MHz by supplied
firmware programming tool. OEM shall not supply any tool or info to the end‐user regarding to
Regulatory Domain change.
USERS MANUAL OF THE END PRODUCT:
In the user manual of the end product, the end user has to be informed to keep at least 20cm
separation with the antenna while this end product is installed and operated. The end user has to be
informed that the FCC radio‐frequency exposure guidelines for an uncontrolled environment can be
satisfied. The end user has to also be informed that any changes or modifications not expressly
approved by the manufacturer could void the user's authority to operate this equipment.
If the size of the end product is smaller than 8x10cm, then additional FCC part 15.19 statement is
required to be available in the users manual: This device complies with Part 15 of FCC rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference and
(2) this device must accept any interference received, including interference that may cause undesired
operation.
FCC WARNING
conditions:
This device complies with part 15 of the FCC Rules. Operation is subject to the following two
Any changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generate, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
-- Reorient or relocate the receiving antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
-- Consult the dealer or an experienced radio/TV technician for help.