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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Design Manual of AFM201T Module Hardware
V1.1 2019.08
Contents
1 Introduction ............................................................................................................. 2
1.1 Abstract ............................................................................................................. 2
1.2 Basic characteristics of module ......................................................................... 2
1.3 Module type ...................................................................................................... 2
1.4 GPIOs of module ............................................................................................... 3
1.5 Block diagram of hardware ............................................................................... 4
2 Design issues of hardware................................ ................................ ....................... 5
2.1 Power design ................................ ................................................................ ..... 5
2.2 Power OFF PIN ................................................................................................. 5
2.3 Reference circuit design .................................................................................... 6
3 Log serial port ......................................................................................................... 7
4 RF design and layout issues .................................................................................... 9
4.1 RF selecting resistor .......................................................................................... 9
4.2 Directions for module layout ............................................................................. 9
4.3 Advice on module layout................................................................................. 10
5 Purchase and support ............................................................................................ 12
Patent statements
2019 99 IoT (Shenzhen) Co., Ltd. reserves all rights for this document. Any part of the
document is not allowed to be reproduced, stored in any retrieval system or transmitted in any
form that has not been unified in written form by 99 IoT (Shenzhen) Co., Ltd.
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Module name
Module description
AFM201TI
PCB onboard antenna
AFM201TO
IPEX outer antenna (optional)
AFM201TP
RF-PinExternal antenna
1 Introduction
1.1 Abstract
The document mainly lists the issues that need attention in all stages during the use of
99 IoT Wi-Fi module AFM201T design by users in order to reduce design costs and
increase product stability as far as possible.
AFM201T is a complete and self-contained WiFi network and Bluetooth(BLE4.2)
solution module that can run either in MCU+WIFI mode or as a slave on other master
MCU. The sensor and other applied specific devices can be integrated through GPIOs
port.
1.2 Basic characteristics of module
Standard: 802.11 b/g/n 1x1
Working mode: STA, AP, STA+AP,BLE4.2
Complete IoT solution (SDK, Cloud service, APP)
Supporting Simple Configuration intelligent networking function (APP is provided)
Supporting Amazon, Baidu cloud, Jingdong cloud, Ali cloud
Each module has unique global MAC ID
Antenna: outer antenna, IPEX antenna interface, onboard antenna
Working ambient temperature: -20 to 85℃
1.3 Module type
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
引脚
名称/主功能
I/O
类型
引脚功能
1
GND
P
(1)
2
ANTENA
(3)
O
3
GND
P
4
GND
P
5
CHIP_EN
(2)
（RESET）
I
Reset（Active low, internal pull-up resistor 10K）
6
PWM1
(7)
GPIOA_0
I/O
(1)
JTAG_CLK/UART1_RX/EXT_32K/PWM0
7
PWM2
(7)
GPIOA_1
I/O
JTAG_TMS/UART1_TX/BT_LED/PWM1
8
UART1_RX
GPIOA_2
I/O
UART1_RX/JTAG_TDO/SPI_CSn/I2C_SCL/PWM2
9
UART1_TX
GPIOA_3
I/O
UART1_TX /JTAG_TDI/SPI_SCL/I2C_SDA/PWM3
10
PWM3
GPIOA_4
I/O
JTAG_TRST/UART1_CTS/SPI_MOSI/PWM4
11
GND
P 12
GND
P 13
VBat_IN
(4)
P
5V Input：5V MCU
14
VD33
(4)
P
3.3V Input：3.3V MCU
15
UART0_RX
(6)
GPIOA_13
I/O
UART0_RX/PWM7
16
UART0_TX
(6)
GPIOA_14
I/O
UART0_TX/SDIO_INT/PWM2
17
LOG_RX
(5)
GPIOA_15
I/O
UART2_RX/SD_D2/SPI_CSn/I2C_SCL/PWM3
18
LOG_TX
(5)
GPIOA_16
I/O
UART2_TX/SD_D3/SPI_SCL/I2C_SDA/PWM4
19
PWM4
GPIOA_17
I/O
SD_CMD/PWM5
20
PWM5
GPIOA_18
I/O
SD_CLK/PWM6
21
GPIO1
GPIOA_19
I/O
SD_D0/SPI_MOSI/I2C_SCl/PWM7
22
GPIO2
GPIOA_20
I/O
SD_D1/SPI_MISO/I2C_SDA/PWM0
23
GPIO3
(7)
GPIOA_23
I/O
PWM7
1.4 GPIOs of module
Description：
1、P is the power pin, I / O is the input and output pin,and CHIP_EN
is the module hardware reset pin.It does not clear the WiFi network
information.
2、Please keep CHIP_EN or other pins floating if they are not used
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
BT-Config
ARM CM4F-MCU
100MHZ
PMU
Trust-zone-M
Secure boot
256K
SRAM
384K
ROM
SoC ON
WIFI-802.11b/
g/n MAC
GPIOs * 16
2.4G
Wi-Fi +
Buletooth
External FLASH
2M（Up to
128M）
SWD
1*GDMA
2 channels
UART * 2
SPI
Master/Salve
I2C
Master/Salve
Switch
Bus
AP /
Cloud Server
Digital
Sensor
5V、3.3V
Input
AFM201T
3、The ANTENA pin is a module antenna output pin that can be connected
to an external antenna.
4、PIN13 and PIN14 are 5V and 3.3v input pins respectively：
When connected to a 5V MCU, PIN13 is directly supplied with 5V voltage,
and PIN14 is directly suspended.
When connected to a 3.3V MCU, PIN13 and PIN14 are directly shorted and
connected to 3.3V.
5、PIN17 and 18 pins are module download I/O and debug ports.
6、5V power supply, only PIN15, 16 can be configured as 5V UART, other
PINs are 3.3v level
7、PIN6, PIN7, and PIN23 are used as IO ports and can only be used as output.
PIN6 is used as Download auxiliary pin, which needs to be
short-circuited to power on to enter Download mode.
1.5 Block diagram of hardware
4.2
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
2 Design issues of hardware
2.1 Power design
As shown in Figure 1.4 above
（1） Input pin of main power supply is [PIN13], module supply voltage is DC 3.0～3.6, filter
capacitor of 4.7-10uF needs to be placed near its location; loading capability of 3.3V
power supply, the power supply with rated output current ≥500mA is recommended.
（2） Use of DC/DC powerchip: voltage output meets 3.3V and the maximum current output
meets 500mA, input capacitor is as close as possible to voltage input pin, thickening
ground wire width or grounded copper area, punching more via holes for different layers.
（3） For LDO design, the voltage output meets 3.3V and the maximum current output meets
500mA, paying attention to device junction temperature, the formula of power
consumption is PD=(Vin-Vout) * Iload + Vin * IGND, in which Vin is input voltage,
Vout is output voltage, Iload is load current, IGND is ground current.
2.2 Power OFF PIN
As shown in Figure 1.4 above
（1） [PIN5] is module reset pin: Power OFF（RESET）.The pull-up of the 10K resistor has
been done inside the module, If this PIN is not controlled by the MCU, it can be left
unconnected . If it is low, the module is shutdown mode.
（2） If the module is not controlled by other MCU, the decoupling capacitor of 100nF is
recommended to be added near its location to enhance the stability of the system.
（3） If other MCU is needed to reset-control the module through the pin, a low pulse signal is
needed and the duration of low level is at least 10ms.
（4） If the voltage of power supply is unstable (lower than 3.0V), it may cause module halt.
It is recommended to add Brown out reset circuit, and the recommended chip is as
follows:
【ONSEMI/MAX809STR/SOT23/LM1117-3.3】. It can also be monitored by other
(master control) MCU.
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
2.3 Reference circuit design
Reference circuit design of module AFW121Tx/AFW122Tx, 5V to 3.3V conversion
5V to 3.3V conversion, LDO reference circuit design
Reset reference circuit design
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
LED flashes when
UART T/RX
Default: R64, UART 3V3 IO
The pin will pull low up
when UART T/R
UART level switching circuit
3 Log serial port
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Level
Function
1
Download image from UART
0
Boot from Flash
The function of J1
（1） PIN5 (PWM1) is a boot PIN:
（2） Serial port pinboard is used to observe output log by connecting abovementioned PIN to
find abnormity of module software conveniently.
（3） Serial port pinboard is used to achieve firmware programming by connecting
abovementioned PIN.
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Selecting RF antenna through
above selection of 0Ω resistor:
R12 selects [PIN2] RF pin;
R10 selects IPEX outer
antenna pedestal;
R11 selects onboard antenna.
R10
R12
R11
4 RF design and layout issues
4.1 RF selecting resistor
4.2 Directions for module layout
（1） When using onboard antenna, layout forbidden area is seen in the figure
below;
（2） The module must be placed vertically with the onboard antenna top located
or the module is placed horizontally with component side up;
（3） When the module is placed vertically, the clear height of module’s both
sides is at least over 12mm;
When the module is placed horizontally, the clear height under the module is
over 6mm;
Cable and other metals are prohibited above the module;
（4） Neither can copper be cladded nor can metal devices, sensors, interference
sources or other materials that have an impact on signal be placed under the
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layout forbidden area.
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Layout forbidden area
5
5
15
24mm
4.3 Advice on module layout
When users use the module with onboard PCB antenna, they can put the module in the
following areas of the baseboard, or place the antenna of module outside the
baseboard, so the module onboard antenna has a larger clearance area compared to the
bottom to reduce the impact of metal devices on PCB antenna and wireless signals. Or
PCB is hollowed under the antenna.
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
Revision
Release Data
Summary
V1.0
2019/08/15
First draft
V1.1
2019/08/27
Adding module layout description,
firmware download description
Layout forbidden area
5mm
12
m
m
5
m
m
12mm
5mm
12
m
m
5mm
12mm
Layout forbidden area
Layout forbidden area
Layout forbidden area
Updating description of historical versions
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Created by： Frank Wong
Date：15/8/2019
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99IoT (Shenzhen) Co., Ltd. User_Manual User Manual of AFM201T Wi-Fi Module
5 Purchase and support
E-mail: sales@sz99iot.com
Frank@sz99iot.com
Tel. 0755-88602663
Address: 509B north block, Cangsong Building, Tairan Seven Road, Futian District, Shenzhen
Website: www.sz99iot.com
12 / 12 For more details, please visit www.sz99iot.com
Page 13
Federal Communication Commission Statement (FCC, U.S.)
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 generates, 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 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.
This device complies with Part 15 of the 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 Caution:
Any changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate this equipment.
IMPORTANT NOTES
Co-location warning:
This transmitter must not be co-located or operating in conjunction with any other
antenna or transmitter.
OEM integration instructions:
This device is intended only for OEM integrators under the following conditions:
The transmitter module may not be co-located with any other transmitter or antenna. The
module shall be only used with the external antenna(s) that has been originally tested
and certified with this module.
As long as the conditions above are met, further transmitter test 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 (for example,
digital device emissions, PC peripheral requirements, etc.).
Validity of using the module certification:
In the event that these conditions cannot be met (for example certain laptop
configurations or co-location with another transmitter), then the FCC authorization for this
module in combination with the host equipment is no longer considered valid and the
FCC ID of the module cannot be used on the final product. In these circumstances, the
OEM integrator will be responsible for re-evaluating the end product (including the
transmitter) and obtaining a separate FCC authorization.
End product labeling:
The final end product must be labeled in a visible area with the following: “Contains
Transmitter Module FCC ID: 2ANN4-AFM201T”.
Page 14
Information that must be placed in the end user manual:
The OEM integrator has to be aware not to provide information to the end user regarding
how to install or remove this RF module in the user's manual of the end product which
integrates this module. The end user manual shall include all required regulatory
information/warning as show in this manual.
Page 15
Integration instructions for host product manufacturers according to KDB 996369 D03 OEM
Manual v01
2.2 List of applicable FCC rules
FCC Part 15 Subpart C 15.247 & 15.207 & 15.209
2.3 Specific operational use conditions
The module is a Bluetooth WIFI module with BLE and WIFI 2.4G function.
Operation Frequency: 2402-2480MHz, 2412~2462MHz
Number of Channel: 40, 11
Modulation: GFSK, 802.11b CCK; 802.11g/n OFDM
Type: PCB Antenna
Gain: 1.3 dBi Max.
The module can be used for mobile or applications with a maximum 1.3dBi antenna. The host
manufacturer installing this module into their product must ensure that the final composit product
complies with the FCC requirements by a technical assessment or evaluation to the FCC rules,
including the transmitter operaition. The host manufacturer has to be aware not to provide information
to the end user regarding how to install or remove this RF module in the user's manual of the end
product which integrates this module. The end user manual shall include all required regulatory
information/warning as show in this manual.
2.4 Limited module procedures
Not applicable. The module is a Single module and complies with the requirement of FCC Part 15.212.
2.5 Trace antenna designs
Not applicable. The module has its own antenna, and doesn’t need a host’s printed board
microstrip trace antenna etc.
2.6 RF exposure considerations
The module must be installed in the host equipment such that at least 20cm is maintained between the
antenna and users’ body; and if RF exposure statement or module layout is changed, then the host
product manufacturer required to take responsibility of the module through a change in FCC ID or new
application. The FCC ID of the module cannot be used on the final product. In these circumstances,
the host manufacturer will be responsible for re-evaluating the end product (including the transmitter)
and obtaining a separate FCC authorization
2.7 Antennas
Antenna Specification are as follows:
Type: PCB Antenna
Gain: 1.3 dBi
This device is intended only for host manufacturers under the following conditions:
The transmitter module may not be co-located with any other transmitter or antenna;
The module shall be only used with the internal antenna(s) that has been originally tested and certified
with this module. The antenna must be either permanently attached or employ a ‘unique’ antenna
coupler.
As long as the conditions above are met, further transmitter test will not be required. However, the
host manufacturer is still responsible for testing their end-product for any additional compliance
requirements required with this module installed (for example, digital device emissions, PC peripheral
requirements, etc.).
2.8 Label and compliance information
Host product manufacturers need to provide a physical or e-label stating “Contains FCC ID: 2ANN4AFM201T”with their finished product.
Page 16
2.9 Information on test modes and additional testing requirements
Operation Frequency: 2402-2480MHz, 2412~2462MHz
Number of Channel: 40, 11
Modulation: GFSK, 802.11b CCK; 802.11g/n OFDM
Host manufacturer must perfom test of radiated & conducted emission and spurious emission, etc
according to the actual test modes for a stand-alone modular transmitter in a host, as well as for
multiple simultaneously transmitting modules or other transmitters in a host product.
Only when all the test results of test modes comply with FCC requirements, then the end product can
be sold legally.
2.10 Additional testing, Part 15 Subpart B disclaimer
The modular transmitter is only FCC authorized for FCC Part 15 Subpart C 15.247 & 15.207 & 15.209
and that the host product manufacturer is responsible for compliance to any other FCC rules that apply
to the host not covered by the modular transmitter grant of certification. If the grantee markets their
product as being Part 15 Subpart B compliant (when it also contains unintentional-radiator digital
circuity), then the grantee shall provide a notice stating that the final host product still requires Part 15
Subpart B compliance testing with the modular transmitter installed.
Page 17
FCC STATEMENT :
This device complies with Part 15 of the 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.
Warning: 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 generates 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 an tenna.
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.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an
uncontrolled environment. This equipment should be installed and operated
with minimum distance 20cm between the radiator & your body.
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