Pi Pico 2 Extreme Teardown
Raspberry Pi's RP2350 chip features dual architecture options (ARM M33 and RISCV), a larger die size, and a buck-boost power supply for battery applications, enhancing functionality and market assessment.
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Raspberry Pi has introduced the RP2350 chip with the new Pico 2 assembly, which features a design similar to its predecessor. The RP2350 includes two ARM M33 cores or two RISCV Hazard 3 cores, allowing users to switch between architectures based on their needs. This dual-architecture approach enables Raspberry Pi to gauge market demand without incurring significant costs. The Pico 2 assembly also incorporates a Richtek RT6150 buck-boost power supply, which can operate from a voltage as low as 1.8V, suggesting potential applications in battery-powered devices. The die size of the RP2350 is larger than that of the previous model, maintaining a 40 nm process. The design includes a power distribution network and various hard-macros for components like USB interfaces and ADC converters. Detailed visuals of the die and its components are available in a linked YouTube video.
- Raspberry Pi's new RP2350 chip features dual architecture options: ARM M33 and RISCV.
- The Pico 2 assembly can operate with a buck-boost power supply from 1.8V, indicating battery use potential.
- The die size of the RP2350 is larger than its predecessor while using the same 40 nm process.
- The design includes hard-macros for essential components, enhancing functionality.
- The dual-architecture design allows Raspberry Pi to assess market demand without high costs.
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> The power supply is a buck-boost from Richtek. Interesting choice as it allows the assembly to be powered from a voltage as low as 1.8V (battery use, perhaps??)
That'd be consistent with how I've used the original Pi Pico in projects, yep. The Pico (and Pico 2) has VBUS and VSYS pins - VBUS being the USB port's 5V, and VSYS being intended for non-USB power sources, including batteries. The Pico 2 datasheet (https://datasheets.raspberrypi.com/pico/pico-2-datasheet.pdf) has some sample schematics for three use cases:
1. A simple case where you connect the external power source to VSYS through a Shottky diode - in which case the Pico will pull from whichever of USB or VSYS has the higher voltage
2. Based on #1, except with a MOSFET instead of a Shottky diode, and with the gate connected to VBUS - in which case the Pico will not pull from VSYS when receiving USB power
3. Based on #2, except there's a battery charger between the external power source and the MOSFET, and VBUS is also connected to the charger's input - in which case the Pico will charge the battery when receiving USB power, in addition to the behavior of #2
(The datasheet also mentions an additional use case: if you're using the Pico as a USB host, you'd want to supply 5V to VBUS in order to power both the Pico and the attached device)
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