PSF-A85

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Overview

The PSF-A85 is an ultra low-power Wi-Fi module designed by ITEAD. The module adopts the highly integrated Wi-Fi chip ESP8285. It features industry's highly competitive packaging size and ultra-low power technology. Specially designed for mobile devices and the Internet of Things application, it connects physical devices to Wi-Fi wireless network to make Internet or LAN communications.

PSF-A85 has completed self-contained wireless network, with built-in 32-bit kernel processor, on-chip SRAM, it can be used as the main control chip, but also as a WiFi adapter. To apply it to other microcontroller based designs, simply by using SPISDIO or I2CUART interface to communicate.

The module supports IPEX connector and stamp hole interface. It can be widely apply for smart power grid, smart transportation, smart home, handheld devices, industrial control, etc.

Go shopping PSF-A85 WiFi Wireless Module Coming Soon!

Features

802.11 bgndeikr

Support STAAPSTA+AP mode

WPAWPA2 PSK and WP

Built-in TCPIP protocol stack, support multi-way TCP Client connection

Support rich Socket AT commands

Support UARTGPIO data communication interface

Built-in 32 bit MCU, also work as application processor

3.3V single supply

Wi-Fi Direct (P2P) support

Support MIMO 1×1 and 2×1, STBC, A- MPDU and A-MSDU aggregation and 0.4μs guard interval

WMM power save U-APSD

Multiple queue management to fully utilize traffic prioritization defined by 802.11e standard.

Adaptive rate fallback algorithm sets the optimum transmission rate and Tx power based on actual SNR and packet loss information.

Functions

Main functions

The main function of PSF-A85 includes serial transparent transmission, PWM control, GPIO control.

Serial transparent transmission good transmission performance, the maximum transmission rate is 460800bps.

PWM control adjust lighting, adjust led color, adjust motor speed and much more.

GPIO control control switches, relay and more.

Operating Mode

STA mode the module connected to Internet via a router, thus mobile phone or computer can remote control devices via Internet.

AP mode PSF-A85 module worked as a hotspot, which realizes directly communication between the module and phonecomputer, enables wireless LAN control.

STA+AP mode this is coexistence mode, which can realize seamlessly switch via the Internet control, easy to operate.

Applications

Serial to Wi-Fi; Industrial transparent transmission DTU; Wi-Fi remote monitoringcontrol; Intelligent Toy; Color LED control; Firefighting and security integrated intelligence management; Intelligent card terminals, wireless POS machines, Wi-Fi cameras, hand-held devices, etc.

Main Technical Specifications

{ class=wikitable ! rowspan=2 Module Type PSF-A85 - 

 Chip  ESP8285

- 

rowspan=10  Wi-Fi  Wireless Standard  IEEE 802.11bgndeikr

- 

Frequency Range  2.412GHz-2.484GHz

- 

rowspan=3 Tx Power  802.11b +20 +-2dBm (@11Mbps)

- 

 802.11g +17 +-2dBm (@54Mbps)

- 

 802.11n +14 +-2dBm (@HT20, MCS7)

- 

 rowspan=3  Rx Sensitivity  802.11b -91 dBm (@11Mbps ,CCK)

- 

 802.11g -75 dBm (@54Mbps, OFDM)

- 

 802.11n -72 dBm (MCS7)

- 

rowspan=2  Connector  External：stamp hole interface

- 

 External：I-PEX connector

- 

rowspan=7 Hardware  Peripheral Interface  UART,IIC,PWM,GPIO,ADC

- 

 Operating Voltage  3.3V

- 

 GPIO Drive capability   Max：12mA

- 

 Operating Current  Continue sending=>Average value：~70mA, Peak value 200mA

Normal mode=> Average value ~12mA, Peak value 200mA Standby：<200uA - 

Operating Temperature Range  -40℃~125℃

- 

 Storage Temperature Range  Temp.：<40℃, Relative humidity：<90%R.H.

- 

 Size  13.5mm13.7mm1mm；

- 

rowspan=2 Serial transparent transmission  Transmission rate  110-921600bps

- 

TCP Client  5

- 

rowspan=5 Software  Wireless network types  STAAPSTA+AP

- 

 Security  WEPWPA-PSKWPA2-PSK

- 

 Encryption  WEP64WEP128TKIPAES

- 

 Firmware Upgrade  UART Download  OTA (via  network)

- 

 Network Protocols  IPv4, TCPUDPFTPHTTP

}

Hardware

PSF-A85 has many interfaces, supports UART, IIC, PWM, GPIO, ADC, etc., suitable for a variety of networking applications.

FilePSF-A85_hardware.jpg500px

We can offer PSF-A85 module PCB package, please contact customer service if you need;

Pin Definitions

FilePSF-A85_pinmap.jpg500px { class=wikitable ! scope=col PIN scope=col Function scope=col Description - 

style=text-alignright  1  ANT  WiFi Antenna

- 

style=text-alignright  2  ADC  ADC, input range 0V-1V；

- 

style=text-alignright  3  EN  Chip enable terminal. Active high chip works normally;

Active low chip close, very small current. - 

style=text-alignright  4  GPIO16  GPIO16

- 

style=text-alignright  5  GPIO14  GPIO14; HSPI_CLK

- 

style=text-alignright  6  GPIO12  GPIO12; HSPI_MISO

- 

style=text-alignright  7  GPIO13  GPIO13; HSPI_MOSI; UART0_CTS

- 

style=text-alignright  8  GPIO15  GPIO15; HSPI_CS; UART0_RTS

- 

style=text-alignright  9  GPIO2  Also used as a programming flash UART1_TX；GPIO2

- 

style=text-alignright  10  GPIO0  GPIO0; SPI_CS2

- 

style=text-alignright  11  GPIO4  GPIO4

- 

style=text-alignright  12  GND  GND

- 

style=text-alignright  13  GPIO9  PIHD；HSPIHD；GPIO9

- 

style=text-alignright  14  GPIO10  SPIWP；HSPIWP；GPIO10

- 

style=text-alignright  15  GPIO11  SPI_CS0；GPIO11

- 

style=text-alignright  16  GPIO6  SPI_CLK；GPIO6

- 

style=text-alignright  17  GPIO7  SPI_MSIO；GPIO7

- 

style=text-alignright  18  GPIO8  SPI_MOSI；GPIO8

- 

style=text-alignright  19  GPIO5  GPIO5

- 

style=text-alignright  20  GND  GND

- 

style=text-alignright  21  RX  Also used as a programming flash UART Rx；GPIO3

- 

style=text-alignright  22  TX  Also used as a programming flash UART Tx ；GPIO1；SPI_CS1

- 

style=text-alignright  23  3V3  Power supply

- 

style=text-alignright  24  RESET  External reset（low active）

}

Power Consumption

The following data are conducted at 25°temperature with 3.3V power supply.

1. All measurements were performed at the antenna interface.

2. All transmitted data are conducted based on a 90% duty cycle, continuous transmission mode.

{ class=wikitable ! scope=col Mode scope=col Typical scope=col Unit - 

Transmit 802.11b,CCK 1Mbps,Pout=+19.5dBm  style=text-alignright  215  mA

- 

Transmit 802.11b,CCK 11Mbps,Pout=+18.5dBm  style=text-alignright  197  mA

- 

Transmit 802.11g,OFDM54 Mbps,Pout=+16dBm  style=text-alignright  145  mA

- 

Transmi t802.11n,MCS7,Pout=+14dBm  style=text-alignright  135  mA

- 

Transmit 802.11b, 1024-byte packet length, -80dBm  style=text-alignright  100  mA

- 

Transmit 802.11g, 1024-byte packet length, -70dBm  style=text-alignright  100  mA

- 

Transmit 802.11n, 1024-byte packet length, -65dBm  style=text-alignright  102  mA

- 

System Standby mode  style=text-alignright  70  mA

- 

Power off  style=text-alignright  0.5  μA

}

Wi-Fi Radio Characteristics

The following data are from tests conducted at room temperature with 3.3V power supply.

Note：

1. 72.2Mbps is measured under 802.11n mode, MCS = 7, GI = 200uS;

2. Maximum output power can be + 19.5dBm in 802.11b mode;

{ class=wikitable ! scope=col Parameters scope=col Min scope=col Typical scope=col Max scope=col Unit - 

Input frequency  2412  -  2484  MHz

- 

Input impedance  -  50    Ω

- 

Input reflection  -  -  -10  dB

- 

Output power of PA for 72.2 Mbp  14  15  16  dBm

- 

Output power of PA  for 802.11b  17.5  18.5  19.5  dBm

- 

colspan=5 Sensitivity

- 

CCK 1Mbps  -  -98  -  dBm

- 

CCK 11Mbps  -  -91  -  dBm

- 

6Mbps(12BPSK)  -  -93  -  dBm

- 

54Mbps(34 64-QAM)  -  -75  -  dBm

- 

HT20,MCS7（65Mbps,72.2Mbps）  -  -71  -  dBm

- 

colspan=5 Adjacent Channel Rejection

- 

OFDM,6Mbps  -  37  -  dB

- 

OFDM,54Mbps  -  21  -  dB

- 

HT20,MCS0  -  37  -  dB

- 

HT20,MCS7  -  20  -  dB

}

WiFi Antenna

PSF-A85 supports two kinds of antenna interfaceIPEX interfaces and stamp hole interface. You can directly use on-board PCB antenna and IPEX antenna, without adding any matching circuit. If you need to design antenna on a large board, you can use PSF-A85 stamp hole antenna interface.

Recommended Temperature Graph

Refer to IPCJEDEC standard; Peak Temperature 250°C; Number of Times ≤2 times;

FilePSF-A85_Recommended_reflux_graph.jpg550px

Related Terminologies

{ class=wikitable ! scope=col Abbreviation scope=col Description - 

WiFi  Wireless Fidelity

- 

UART  Universal Asynchronous Receiver & Transmitter

- 

DTIM  Delivery Traffic Indication Message

- 

SOC  System On a Chip

- 

P2P  Point to Point

- 

TCP  Transmission Control Protocol

- 

IP  Internet Protocol

- 

STBC  Space-Time Block Coding

- 

MIMO  Multiple Input Multiple Output

- 

MPDU  MAC Protocol Data Unit

- 

MSDU  MAC Server Data Unit

- 

IEEE  Institute Of Electrical And Electronics Engineers 

- 

bps  Bits Per Second

- 

CCK  Corporate Control Key

- 

DQPSK  Differential Quadrature Phase Shift Keying

- 

DBPSK  Differential Binary Phase Shift Keying

- 

QAM  Quadrature Amplitude Modulation

- 

OFDM  Orthogonal Frequency Division Multiplexing

- 

WPA  Wi-Fi Protected Access

- 

WPS  Wi-Fi Protected Setup

- 

TKIP  Temporal Key Integrity Protocol

- 

WAPI  Wlan Authentication And Privacy Infrastructure

- 

WEP  Wired Equivalent Privacy

- 

CRC  Cyclic Redundancy Check

}

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