Data Sheet

ISM4343 Specification
DOC-DS-20074-5.3
Inventek Systems
Page 14
6.3 SPI (Serial Peripheral Interface Bus) – USES STM32F412 SPI4
The eS-WiFi module supports a custom SPI host interface with the IWIN SPI Firmware.
The IWIN AT Command firmware for a SPI host interface is connected to SPI 4 bus on the
module and is designed to utilize a command / data ready signal to help maximize Wi-Fi data
throughput.
The IWIN firmware uses SPI 4 for the interface and requires use of this Data Ready pin. The
additional Flash on the SiP is connected to SPI 1 so it should not be used for the AT
Command SPI connection. SPI1 Pins are 8, 74, 75 and 76.
SPI4 Pins to connect when using the ISM4343-WBM-L151 SiP:
Pin
Description
STM32F412
11
MICRO_SPI4_NSS
PE11
12
MICRO_SPI4_SCK
PE12
13
MICRO_SPI4_MISO
PE13
14
MICRO_SPI4_MOSI
PE14
122
CMD_Data Ready
PA3
SPI4 Pins to connect when Using the ISM4343-WBM-L54 Module:
Pin
Description
STM32F412
51
SPI4_NSS
PE11
52
SPI4_SCK
PE12
53
SPI4_MISO
PE13
54
SPI4_MOSI
PE14
13
CMD_Data Ready
PA3