Midea SK110 Smart Kit User Guide

Midea SK110 Smart Kit

Overview

EU-SK107 is a low-cost and low-power UART to serial universal Wi Fi+BLE module that can connect UART data to the internet. This module supports the IEEE 802.11 b/g/n protocol. This module is designed based on the REALTEK RTL8720 chip, which is a highly integrated single chip with application processors, low-power Wi Fi subsystems, Bluetooth subsystems, and power management units. The application processor subsystem includes ARMv8-M, MCU, and WLAN MAC. It also includes many peripheral devices, including UART, I2C, and GPIO. It also includes embedded SRAM/ROM.

Block diagram

The basic function

1. Supports IEEE 802.11b/g/n protocol
2. Supports 20MHz bandwidth in the 2.4GHz band
3. Support encryption protocols: WEP, WPA, WPA2, WPA3, TKIP
4. Support IPv4, TCP, UDP, DNS, HTTP and other network protocols

Module parameters

11g: BPSK, QPSK, 16QAM, 64QAM and OFDM
Modulation system| 11n: MCS0~7 OFDM
BLE 4.2: GFSK
| 11b: 1Mbps,2Mbps,5.5Mbps,11Mbps
11g:
6Mbps,9Mbps,12Mbps,18Mbps,24Mbps,36Mbps,48Mbps,54Mbps
Data transfer rates|
11n:  MCS0,MCS1,MCS2,MCS3,MCS4,MCS5,MCS5,MCS6,MCS7
BLE 4.2: 1Mbps
Main interface| Uart interface
bit/s Module and electronic control board
communication baud
rate range (Input/Output) bit/s| 9600,14400,19200,38400,57600,115200 Uart RX/TX max tolerance ±2%
PCB
PCB specification| 2-layers design
PCB
PCB size| 18mm(W)35.2mm(L)1.0mm(T)
Antenna| PCB Antenna
Operating temperature| -20~85℃
Operating Voltage| 4.5~5.5V

Radio frequency characteristics

IEEE802.11b

| parameter| illustrate
---|---|---
1| Standard| IEEE 802.11b
2| Wireless modulation mode| DQPSK , DBPSK and CCK with DSSS
3| Operating frequency| 2400~2483.5MHz ISM( ISM band）
4| Channel Number| (13 channels)
5| rate| 11Mbps  （at most 11Mbps）
6| Media Access Protocol| CSMA/CA with ACK
7| Typical output power| 17±2 dBm at 11Mbps @ 25℃
8| Typical reception sensitivity| -83 dBm for 11Mbps@ 25℃&8% ( Packet loss rate less than 8%)

IEEE802.11g

| parameter| illustrate
---|---|---
1| Standard| IEEE 802.11g
2| Wireless modulation mode| QPSK , BPSK , 16QAM ,64QAM with OFDM
3| Operating frequency| 2400~2483.5MHz ISM  ISM band）
4| Channel Number|
5| rate| 54Mbps（at most 54Mbps）
6| Media Access Protocol| CSMA/CA with ACK
7| Typical output power| 15±2 dBm at 54Mbps @ 25℃
8| Typical reception sensitivity| -71 dBm for 54Mbps @ 25℃ & 10% ( Packet loss rate less than 10%)

IEEE 802.11n

|

 **parameter**

|

 **illustrate**  

---|---|---
1| Standard| IEEE 802.11n
2| Wireless modulation mode| BPSK , QPSK , 16QAM ,64QAM with OFDM
3| Operating frequency| 2.4GHz :2400 ~ 2483.5MHz
4| rate| 65Mbps（at most 65Mbps）
5| Media Access Protocol| CSMA/CA with ACK
6| Typical output power| 2.4GHz Band/HT20
14±2dBm at MCS7@ 25℃
7| Typical reception sensitivity| 2.4GHz Band/HT20
-68dBm at MCS7 @ 25℃&10% ( Packet loss rate less than 10%)

 **Bluetooth part**

| parameter| illustrate
---|---|---
1| Standard| 4.2
2| Wireless modulation mode| GFSK
__

3

| Operating frequency| 2.4GHz :2400 ~ 2483.5MHz
4| rate| 1Mbps（at most 1Mbps）
5| Media Access Protocol| L2CAP and LL.
6| Antenna Output Power| 4.5dBm(excluding antenna output power)
__

7

| Antenna reception sensitivity| -100dB（spur channel)(Excluding Spur channel, excluding antenna reception sensitivity)

Appearance dimensions (Unit: mm)

Real figure

Antenna Information

Antenna Type
PCB onboard antenna:17.5mm*3.8mm

Antenna Interference Reduction

To ensure optimal RF performance, it is recommended that the antenna be at least 15 mm away from other metal parts. If metal materials are wrapped around the antenna, the wireless signals will be reduced greatly, deteriorating the RF performance. Because the antenna is inserted to the PCB, sufficient space needs to be reserved for the antenna. It is better there is no shielding cover and other similar equipment outside the antenna, no interference source of the same frequency band, and close to the wireless router to ensure good signal, and it is best to have no conflict between WiFi and the channel.

Precautions for device use

1. When testing/using, handle with care, avoid collision, avoid fall. Do not stack, do not stand upright, to prevent damage
2. 5V +/-5%, Working voltage range: 5V +/-5%.
3. Working temperature range: -25 degrees ~85 degrees, working humidity: relative humidity is less than 90%, if more than it may cause WIFI drop, but will not damage.
   -40℃to +125℃；5%-95%RH。 Storage environment: dustproof, moisture-proof, anti-static, temperature: storage temperature: -40℃ to +125℃; Humidity: 5% – 95% RH.
4. CAUTIONS
   To satisfy FCC exterior labeling requirements, the following test must be placed on the exterior of the end product “Contains Transmitter module FCC ID: 2ADQOMDNA23” To satisfy ISED exterior labeling requirements, the following text must be placed on the exterior of the end product “Contains Transmitter module IC: 12575A-MDNA23”

This product complies with Part 15.212 and 15.247 of the FCC rules.
This device complies with Part 15 of the FCC Rules and it contains licence- exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic Development Canada’s licence-exempt RSS(s).
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.

Only operate the device in accordance with the instructions supplied.
Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

This radio module must not be installed to co-locate and operate simultaneously with other radios in the host system except by following FCC multi-transmitter product procedures. Additional testing and device authorization may be required to operate simultaneously with other radios.
The availability of some specific channels and/or operational frequency bands are country dependent and are firmware programmed at the factory to match the intended destination. The firmware setting is not accessible to the end-user.
The host product manufacturer is responsible for compliance with any other FCC rules that apply to the host not covered by the modular transmitter grant of certification. The final host product still requires Part 15 Subpart B compliance testing with the modular transmitter installed. The separate approval is required for all other operating configurations including portable configurations with respect to Part 2.1093 and different antenna configuration.
The end-user manual shall include all required regulatory information/warnings as shown in this manual, including “This product must be installed and operated with a minimum distance of 20 cm between the radiator and user body”. The OEM integrator is responsible for ensuring that the end-user has no manual instructions to remove or install module. This device is intended only for OEM integrators under the following conditions: The antenna must be installed such that 20cm is maintained between the antenna and users, and the transmitter module may not be co-located with any other transmitter or antenna. As long as the 2 conditions above are met, further transmitter tests will not be required. However, the OEM integrator is still responsible for testing their end-product for any additional compliance requirements required with this module installed.

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