SPWF04SA SPWF04SC Serial-to-Wi-Fi b/g/n intelligent modules Preliminary Datasheet – 13.7 dBm @ 54 Mbps OFDM RX sensitivity – -96.0 dBm @ 1 Mbps DSSS – -74.5 dBm @ 54 Mbps OFDM 16 configurable GPIOs available UART and SPI interface to host system Advanced low-power modes – Standby with RTC: 0.8mA (TBC) – Sleep connected (DTIM=1): 19 mA – RX traffic 113 mA typical – TX traffic 248 mA typical @ 18 dBm Features 2.4 GHz IEEE 802.
Description 1 SPWF04SA, SPWF04SC Description The SPWF04SA and the SPWF04SC intelligent Wi-Fi modules represent a plug-and-play and standalone 802.11 b/g/n solution for easy integration of wireless Internet connectivity features into existing or new products. Configured around a single-chip 802.11 transceiver with integrated PA and comprehensive power management subsystem, and an STM32 microcontroller with an extensive GPIO suite, the modules also incorporate timing clocks and voltage regulators.
SPWF04SA, SPWF04SC Description Figure 1.
General electrical specifications 2 SPWF04SA, SPWF04SC General electrical specifications Table 1. Absolute maximum ratings Parameter Test condition/comment Voltage supply Min. Typ. -0.3 Vin for 5 V tolerant pins -0.3 - Vin for all other pins Storage temperature range -0.3 - -55 Max. Unit 4.0 V 5.5 V 3.6 V 105 °C Table 2. Operating conditions and input power specifications(1) Parameter Operating temperature range Test condition/comment Min. Typ. Max. Unit 85 °C 3.
SPWF04SA, SPWF04SC 3 Digital interface specifications Digital interface specifications Table 3. Digital interface specifications, I/O pins Parameter Inputs Test condition/comment Min. VIH 2.3 VIL 0 VOH IOH=4 mA 2.4 VOL IOL=4 mA 0 Outputs DocID025635 Rev 7 Typ. - Max. Unit 3.6 V 0.9 V 3.6 V 0.
RF characteristics 4 SPWF04SA, SPWF04SC RF characteristics Table 4. RF characteristics Parameter RX sensitivity(1) Test condition/comment Typ. Max. Unit 11b, 1 Mbps -96 dBm 11b, 2 Mbps -93 dBm 11b, 5.5 Mbps -91 dBm 11b, 11 Mbps -87 dBm 11g, 9 Mbps -89.5 dBm 11g, 18 Mbps -86 dBm 11g, 36 Mbps -80 dBm 11g, 54 Mbps -74.5 dBm 11n, MCS1, 13 Mbps -86.5 dBm 11n, MCS3, 26 Mbps -81.
SPWF04SA, SPWF04SC 5 Pinout description Pinout description Table 5.
Pinout description SPWF04SA, SPWF04SC Table 5. Pinout description (continued) Signal name Type Pin number Main function GPIO[14] I/O 14 LED drive, Power up Alternate functions(1) Notes UART pins RXD / MOSI TXD / MISO I 8 5V tolerant 6 5V Tolerant CTS / nCS I 9 Active low, 5V tolerant RTS / CLK O 10 5V tolerant Reset RESETn I 3 Active low for 5 ms with pull up to 2.5VDC. Not 5V tolerant Reset input Supply pins and paddle Decouple with 10uF capacitor 3.
SPWF04SA, SPWF04SC Pinout description 5. To enable the firmware download, pin BOOT0 needs to be high during power up. RESETn need to be pulled low at least 5 ms to initiate the firmware download sequence. Application guidelines The HOST processor should control the RESETn pin of the module in order to recover from unexpected behavior using the HW reset.
Module reflow 6 SPWF04SA, SPWF04SC Module reflow The SPWF04SA and SPWF04SC are surface mount modules with a 6-layer PCB. The recommended final assembly reflow profiles are indicated below. The soldering phase must be executed with care: in order to prevent an undesired melting phenomenon, particular attention must be paid to the setup of the peak temperature. The following are some suggestions for the temperature profile based on the IPC/JEDEC JSTD-020C, July 2004 recommendations. Table 6.
SPWF04SA, SPWF04SC 7 Regulatory compliance Regulatory compliance RF compliance The RF certifications obtained are described in Table 7 below. Table 7.
SPWF04SA, SPWF04SC Regulatory compliance *Note all data provided in this table are based on the Antenova reference board FCC and IC This module has been tested and complies with the FCC part 15 and IC RSS-247 regulations. These limits are designed to provide reasonable protection against harmful interference in approved installations.
Regulatory compliance SPWF04SA, SPWF04SC Labeling instructions When integrating the SPWF04SA and SPWF04SC into the final product, it must be ensured that the FCC and IC labeling requirements specified below are satisfied. Based on the Public Notice from FCC, the product into which the ST transmitter module is installed must display a label referring to the enclosed module.
SPWF04SA, SPWF04SC 8 Package information Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 4. Top view of the module shield Shield CE Logo Figure 5.
Package information SPWF04SA, SPWF04SC Figure 6. Wi-Fi module dimensions Note: 14/18 An antenna area of 217 x 520 mils must be free of any ground metalization or traces under the unit. The area extending away from the antenna should be free from metal on the PCB and housing to meet expected performance levels. Pin 25 is the required paddle ground and is not shown in this diagram.
SPWF04SA, SPWF04SC Package information Figure 7. Wi-Fi module footprint PCB design requires a detailed review of the center exposed pad. This pad requires good thermal conductivity. Soldering coverage should be maximized and checked via x-ray for proper design. There is a trade-off between providing enough soldering for conductivity and applying too much, which allows the module to “float” on the paddle creating reliability issues.
Regulatory compliance 9 SPWF04SA/C Ordering information Table 8. Ordering information Order codes Note: Description SPWF04SA Wi-Fi module with integrated antenna, 1 MB of Flash and Wi-Fi full stack SPWF04SC Wi-Fi module with integrated ufl connector, 1 MB of Flash and Wi-Fi full stack Refer to the user manual for a complete list of features and commands available in the Wi-Fi full stack.
Regulatory compliance SPWF04SA/C Déclaration de conformité A.1 Certification FCC Le module SPWF04SA/C a été testé et déclaré conforme avec la section 15 de la Règlementation FCC. Ces limitations sont stipulées afin de procurer une protection raisonnable contre les interférences gênantes dans les installations approuvées.
Regulatory compliance A.1.2 SPWF04SA, SPWF04SC Instructions pour l’utilisation du produit La présente section concerne les produits finis contenant le module SPWF04SA/C, assujettis aux normes FCC.
Regulatory compliance A.2 SPWF04SA, SPWF04SC Certification IC (a) Le module SPWF04SA/C a été testé et déclaré conforme avec la Règlementation IC CNR-210. Ces limitations sont stipulées afin de procurer une protection raisonnable contre les interférences gênantes en installations approuvées.
Regulatory compliance A.2.2 SPWF04SA, SPWF04SC Instructions pour l’utilisation du produit La présente section concerne les produits finis contenant le module SPWF04SA/C, assujettis aux normes IC.
Regulatory compliance SPWF04SA, SPWF04SC Ces limites sont conçues pour fournir une protection raisonnable contre toute interférence dangereuse issue d'une installation résidentielle. Cet équipement produit, utilise et peut émettre de l'énergie radio électrique et, s'il n'est pas installé et utilisé conformément aux présentes instructions, peut causer des interférences nuisibles aux communications radio. Cependant, il se peut que des interférences se produisent dans une installation particulière.
Regulatory compliance A1 SPWF04SA, SPWF04SC
SPWF04SA, SPWF04SC 10 Revision history Revision history Table 9. Document revision history Date Revision 27-Apr-2016 1 Changes Initial release.
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