User's Manual

WizFi320 User Manual

Functional Description

This chapter describes the modules and functions integrated in WizFi320.

3.1 CPU and Internal Memory

ESP32-DOWD-V3 contains two low-power Xtensa® 32-bit LX6 microprocessors. The

internal memory includes:

•

448 KB of ROM for booting and core functions.

•

520 KB of on-chip SRAM for data and instructions.

•

8 KB of SRAM in RTC, which is called RTC FAST Memory and can be used for data

storage; it is

accessed by the main CPU during RTC Boot from the Deep-sleep mode

•

8 KB of SRAM in RTC, which is called RTC SLOW Memory and can be accessed by

the co- processor during the Deep-sleep mode

•

1 Kbit of eFuse: 256 bits are used for the system (MAC address and chip

configuration) and the remaining m768 bits are reserved for customer applications,

including flash-encryption and chip- ID.

3.2 External Flash

WizFi320 integrates a 4 MB SPI flash, which is connected to GPIO6, GPIO7, GPIO8,

GPIO9, GPIO10 and GPIO11 of ESP32.

3.3 Crystal Oscillators

The module uses a 40-MHz crystal oscillator.

3.4 RTC and Low-Power Management

With the use of advanced power-management technologies, ESP32 can switch between

different power modes. For details on

ESP32’s

power consumption in different

power modes, please refer to section

”RTC

and Low-Power

Management”.