99iot AF-W12xTx User Manual
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Design Manual of AF-W12xTx Module Hardware
1.2 Basic characteristics of module...........................................................................2
1.3 Module type ........................................................................................................2
1.5 Block diagram of hardware.................................................................................4
2.2 Reset pin..............................................................................................................5
2.3 Reference circuit design......................................................................................6
6.2 Directions for module layout ............................................................................10
V1.1 2017.08
Contents
1 Introduction...............................................................................................................2
1.1 Abstract ............................................................................................................... 2
1.4 Sketch map of module.........................................................................................3
2 Design issues of hardware ........................................................................................ 5
2.1 Power design .......................................................................................................5
3 Application programming interface..........................................................................7
4 Log serial port ...........................................................................................................8
5 Communication serial port........................................................................................9
6 RF design and layout issues......................................................................................9
6.1 RF selecting resistor.......................................................................................... 9
6.3 Advice on module layout ..................................................................................11
7 Purchase and support ..............................................................................................12
Patent statements
2017 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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1 Introduction
Supporting Simple Configuration intelligent networking function (APP is provided)
Supporting Amazon, Baidu cloud, Jingdong cloud, Ali cloud
Module name
Module description
AF-W121TI
PCB onboard antenna
AF-W121TO
IPEX outer antenna (optional)
AF-W123TI
PCB onboard antenna
AF-W123TO
IPEX outer antenna (optional)
1.1 Abstract
The document mainly lists the issues that need attention in all stages during the use of
99 IoT Wi-Fi module AF-W12xTx design by users in order to reduce design costs and
increase product stability as far as possible.
AF-W12xTx is a complete and self-contained WiFi network 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 GPIO port.
1.2 Basic characteristics of module
Standard: 802.11 b/g/n 1x1
Working mode: STA, AP, STA+AP
Complete IoT solution (SDK, Cloud service, APP)
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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1.4
引脚 名称 /主功能 类型 可选功能
Pin Name/ main function Type Optional functions
其它功能
Other
functions
1
GND
2
Wi-Fi-ANTENA
3
GND
4
NC/GND
5
CHIP_EN(RESET)
I
Reset
6
GPIOA_14
I/O
PWM0/ SWD_CLK
7
GPIOA_15
I/O
PWM1/ SWD_DATA
8
GPIOA_0
I/O
PWM2/EXT_32K/WL_LED
9
GPIOA_12
I/O
PWM3
10
GND
11
VDD33
12
GND
13
VBAT_MEAS
14
GPIOA_5
I/O
SDIO_SIDEBAND_INT/ PWM4
15
GPIOA_18
I/O
UART0_RXD/SPI1_CLK /SPI0_CLK
I2C1_SCL /
/
SD_D2/ TIMER4_TRIG/
I2S_MCK
16
GPIOA_19
I/O
UART0_CTS/SPI1_CS/SPI0_CS
I2C0_SDA/SD_D3/TIMER5_TRIG
I2S_SD_TX
Sketch map of module
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17
GPIOA_22
I/O
UART0_RTS / SPI1_MISO/
SPI0_MISO / I2C0_SCL
SD_D0 / PWM5 / I2S_WS
18
GPIOA_23
I/O
UART0_TXD/ SPI1_MOSI/
SPI0_MOSI / I2C1_SDA
SD_D1 / PWM0
19
GPIOA_30
I/O
UART2_Log_TXD/ I2C0_SDA/
PWM3 / RTC_OUT
20
GPIOA_29
I/O
UART2_Log_RXD / I2C0_SCL
PWM4
21
GND
Note:
1.5
Block diagram of hardware
AF-W121Tx/AF-W
123Tx
Backup register forpower
save SRAM16B
P
MU
3.3V
Inp
ut
256
K
SRA
M
ARMCM4F-M
CU
125MHZ ormor
e
512
K
R
OM
Digit
al
Sensor
ExternalFLAS
H
2M（Upto
128M
）
GDM
A
12
VBAT_MEA
GTIMER
6set
s
SPI
Master/Salve
I2C
Master/Salve
SDIO/USB
Device
SoC
ON
2.4G
HZ
S
witch
Bus
WIFI-802.11b/
g/nMAC
GPIOs *
11
PWM *
6
I2S
RTC
SW
D
UART *
2
ADC
AP
/
CloudServer
1. PIN19, 20 are for the use when Wi-Fi debugs LOG information input and output
port.
2. PIN19 of module AF-W121Tx needs to be pulled up to 3.3V externally, or floating,
or to ensure that power-on time isn’t low level.
3. Please keep CHIP_EN or other pins floating if they are not used.
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