Click here to ask about the production status of specific part numbers. Evaluates: MAX78000 MAX78000FTHR Application Platform General Description Features The MAX78000FTHR is a rapid development platform to MAX78000 Microcontroller help engineers quickly implement ultra low-power, artifi- Dual Core: Arm Cortex-M4 Processor with FPU, cial intelligence (AI) solutions using the MAX78000 Arm 100MHz, RISC-V Coprocessor, 60MHz Cortex -M4F processor with an integrated Convolutional 512KB Flash Memory Neural Network accelerator. The board also includes the 128KB SRAM MAX20303 PMIC for battery and power management. 16KB Cache The form factor is 0.9in x 2.6in dual-row header footprint Convolutional Neural Network Accelerator that is compatible with Adafruit Feather Wing periph- 12-Bit Parallel Camera Interface eral expansion boards. The board includes a variety of MAX20303 Wearable PMIC with Fuel Gauge peripherals, such as a CMOS VGA image sensor, digital Charge from USB microphone, low-power stereo audio CODEC, 1MB QSPI On-Board DAPLink Debug and Programming SRAM, micro SD card connector, RGB indicator LED, Interface for Arm Cortex-M4 processor with FPU and pushbutton. The MAX78000FTHR provides a power- Breadboard Compatible Headers optimized flexible platform for quick proof-of-concepts and Micro USB Connector early software development to enhance time to market. Micro SD Card Connector Go to MAX78000FTHR Evaluates: MAX78000 Application Platform the junction temperature continues to rise and reach- Quick Start es the maximum operating limit, no input current is Apply power to the MAX78000FTHR using the USB drawn from the charge input and the battery powers cable. The pre-programmed Audio Keyword Spotting the entire system load. demo will begin to execute. The USB charge current is set to 51mA. This allows charg- The RGB LED (D2) will turn on green, indicating that ing from both powered and unpowered USB hubs with no the demo is running. The on-board microphone starts port communication required. Refer to the MAX20303 listening for the keyword GO. When the keyword GO is data sheet and the data sheet for your battery to ensure detected, RGB LED (D2) will turn on yellow. In this mode, compatibility. when one of nine keywords is detected, the RGB LED (D1) starts to blink blue one to nine times based on the Programming and Debugging number detected by the convolutional neural network. The MAX32625 microcontroller on the board is pre- The STOP command exits number keyword detection, programmed with DAPLink firmware. It allows debugging and the RGB LED (D2) turns on green again, and RGB and programming of the MAX78000 Arm core over USB. LED (D1) turns off. A standard 10-pin JTAG header J1 allows debugging and PMIC and Battery Charger programming the RISC-V core of the MAX78000. The MAX20303 wearable PMIC powers the Pushbuttons MAX78000FTHR board and is also capable of charging a There are five pushbuttons on the MAX78000FTHR Li-Ion battery (not included). The MAX20303 has an inter- board: nal MOSFET that connects the battery to system output when no voltage source is available on the charge input SW1 User-programmable function button connected to (USB). When an external source is detected at the charge the MAX78000 Port 0.2 through a debouncer IC. input (USB), this switch opens and the system output is SW2 User-programmable function button connected to powered from the input source through the input current the MAX78000 Port 1.7 through a debouncer IC. limiter. The system output to battery switch also prevents SW3 PMIC Power Button the system output voltage from falling below battery volt- When the board is in a powered-on state, press- age when the system load exceeds the input current limit. ing this button for 12 seconds performs a hard The smart power selector unit inside the PMIC seamlessly power-down. distributes power from the charge input (USB) to the bat- When the board is in a powered-off state, pressing tery and system output. With both the USB and battery this button powers on the board. connected, the smart power switch s basic functions are: This button can also be read by the MAX78000 When the system load requirements are less than firmware, PMIC PFN2 signal connected to the the input current limit, the battery is charged with Port 3.1 is a buffered input of the button status. residual power from the input. When the button is pressed, this signal goes to a When the system load requirements exceed the input logic-low state. current limit, the battery supplies supplemental cur- SW4 Resets the MAX78000 through RSTN input of the rent to the load. MAX78000. When the battery is connected, and there is no exter- SW5 DAPLink adapter button. Keep this button nal power input (USB), the system is powered from pressed while applying power to the board to the battery. put the MAX32625 DAPLink adapter on board When the MAX20303 thermal limits are reached, the to MAINTENANCE mode for DAPLink firmware charger does not shut down, but attempts to limit a updates. temperature increase by reducing the input current LEDs from charge input. In this condition, the system load There are three RGB LEDs on the MAX78000FTHR has priority over the charger current, so the input cur- board. rent is first reduced by lowering the charge current. If Maxim Integrated 2 www.maximintegrated.com