PSF-A85

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Overview

PSF-A85.JPG

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 not only 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 antenna of IPEX connector and stamp hole interface. It is widely applied to smart power grid, smart transportation, smart home, handheld devices, industrial control, etc.

Tutorial: Using ESP8266/ESP8285 to blink an LED

Go shopping PSF-A85 WiFi Wireless Module(SKU:IM160708001)

Features

  • 802.11 b/g/n/d/e/i/k/r
  • Support STA/AP/STA+AP mode
  • WPA/WPA2 PSK and WP
  • Built-in TCP/IP protocol stack, support multi-way TCP Client connection
  • Support rich Socket AT commands
  • Support UART/GPIO 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 monitoring/control;

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

Module Type PSF-A85
Chip ESP8285
Wi-Fi Wireless Standard IEEE 802.11b/g/n/d/e/i/k/r
Frequency Range 2.412GHz-2.484GHz
Tx Power 802.11b: +20 +/-2dBm (@11Mbps)
802.11g: +17 +/-2dBm (@54Mbps)
802.11n: +14 +/-2dBm (@HT20, MCS7)
Rx Sensitivity 802.11b: -91 dBm (@11Mbps ,CCK)
802.11g: -75 dBm (@54Mbps, OFDM)
802.11n: -72 dBm (MCS7)
Connector External:stamp hole interface
External:I-PEX connector
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 13.5mm*13.7mm*1mm;
Serial transparent transmission Transmission rate 110-921600bps
TCP Client 5
Software Wireless network types STA/AP/STA+AP
Security WEP/WPA-PSK/WPA2-PSK
Encryption WEP64/WEP128/TKIP/AES
Firmware Upgrade UART Download / OTA (via network)
Network Protocols IPv4, TCP/UDP/FTP/HTTP

Hardware

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

PSF-A85 hardware.jpg

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

Pin Definitions

PSF-A85 pinmap.jpg

PIN Function Description
1 ANT WiFi Antenna
2 ADC ADC, input range: 0V-1V;
3 EN Chip enable terminal. Active high: chip works normally;

Active low: chip close, very small current.

4 GPIO16 GPIO16
5 GPIO14 GPIO14; HSPI_CLK
6 GPIO12 GPIO12; HSPI_MISO
7 GPIO13 GPIO13; HSPI_MOSI; UART0_CTS
8 GPIO15 GPIO15; HSPI_CS; UART0_RTS
9 GPIO2 Also used as a programming flash UART1_TX;GPIO2
10 GPIO0 GPIO0; SPI_CS2
11 GPIO4 GPIO4
12 GND GND
13 GPIO9 PIHD;HSPIHD;GPIO9
14 GPIO10 SPIWP;HSPIWP;GPIO10
15 GPIO11 SPI_CS0;GPIO11
16 GPIO6 SPI_CLK;GPIO6
17 GPIO7 SPI_MSIO;GPIO7
18 GPIO8 SPI_MOSI;GPIO8
19 GPIO5 GPIO5
20 GND GND
21 RX Also used as a programming flash UART Rx;GPIO3
22 TX Also used as a programming flash UART Tx ;GPIO1;SPI_CS1
23 3V3 Power supply
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.

Mode Typical Unit
Transmit 802.11b,CCK 1Mbps,Pout=+19.5dBm 215 mA
Transmit 802.11b,CCK 11Mbps,Pout=+18.5dBm 197 mA
Transmit 802.11g,OFDM54 Mbps,Pout=+16dBm 145 mA
Transmi t802.11n,MCS7,Pout=+14dBm 135 mA
Transmit 802.11b, 1024-byte packet length, -80dBm 100 mA
Transmit 802.11g, 1024-byte packet length, -70dBm 100 mA
Transmit 802.11n, 1024-byte packet length, -65dBm 102 mA
System Standby mode 70 mA
Power off 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;

Parameters Min Typical Max 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
Sensitivity
CCK 1Mbps - -98 - dBm
CCK 11Mbps - -91 - dBm
6Mbps(1/2BPSK) - -93 - dBm
54Mbps(3/4 64-QAM) - -75 - dBm
HT20,MCS7(65Mbps,72.2Mbps) - -71 - dBm
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;

PSF-A85 Recommended reflux curve.jpg

Related Terminologies

Abbreviation 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

Download

File:PSF-A85_Schmatic.pdf

File:PSF-A85_VIEW.pdf

File:PSF-A85_Dimension.pdf

File:0a-esp8285_datasheet_cn.pdf

File:0a-esp8285_datasheet_en.pdf

For the convenience of using PSF-A85 module, now we offer PSF-A85 kicad, eagle package library. Also, we provide Eagle PCB antenna file. Please don't rub copper near the antenna.

File:PSF-A85_EAGLE.zip

File:PSF-A85_KICAD.zip