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What is the Avalon 920 921 power module unit?
PMU, or Power Management Unit, is a highly integrated power management solution for portable applications. It integrates traditional separate types of power management devices, such as DC/DC converters (DC/DC), low dropout linear regulators (LDO) into one package, which can achieve higher power conversion efficiency and lower power consumption, and lower component count to accommodate shrinking board space, lower cost.PMU is generally composed of three parts: DC/DC switching power supply, LDO low-dropout linear stable power supply, and resistance and capacitance of the control part. The PMU is generally customized and bound to the main chip.
The Avalon 920 921 PMU, as a power management integrated unit for a specific main chip, can provide the Avalon miner 920 921 with all the power supplies of multiple grades and different voltages required by the main chip. The Avalon 920 921 Power Module Unit contains the L and R two parts into one power management unit. According to the needs of the main chip, power management, charging control, and switch control circuits are integrated.
Avalon 920 921 Power Module Unit has built-in over/under voltage (OVP/UVP), over-temperature (OTP), over current (OCP), and other protection circuits, which can be safely and transparently distributed between USB and external AC adapter, lithium battery, and application system load, so that all units can work typically. To save energy, the device is also equipped with a switch control circuit and charging control.
Avalon 920 921 PMU product details:
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1. The chip system usually uses different voltages. When the power is turned on and off, if the sequence and time required by the chip are not strictly followed, not only can the system not be started, but the chip will be burned in severe cases.
2. When the semiconductor circuit is working, the working current will be significant and small; that is to say, the load is not constant. For the circuit that provides the power supply, when the load changes, the power supply circuit should be able to keep the voltage obtained by the loaded chip unchanged.
3. Sometimes, the power supply voltage used by the system may be unstable, which requires the output of the power supply circuit to be stable under the fluctuation of the input voltage.
4. In order to save power, the primary consideration is the battery power supply system, and the unused power supply should be turned off as much as possible.
In order to match the power-on sequence of the CPU, after the CPU works typically, each module of the PMIC can be controlled through the I2C interface. For example, different operating frequencies need to adjust the core voltage to the corresponding voltage when the system frequency conversion. In addition, the more power supplies of the PMIC, the finer the power supply to the modules of the system, and the less the power supply of each module is involved, so the more power is saved.
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