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Battery power is quite limited, so we need to make sure we try our best to conserve it. The [[Neo1973 Power Management |Neo1973 Power Management page]] tries to describe the various power management features of the [[:Category:Neo1973 Hardware | Neo1973 Hardware]], their states, transitions, etc. First, we start by describing the power states of the individual hardware components. Then we look at it from a System Integration point of view. | |
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=== NOPOWER === | === NOPOWER === | ||
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Contents |
S3C2410 SoC
The S3C2410 SoC section is an overview of the S3C2410 power states or modes and their capabilities. The S3C2410 has the following modes:
Normal Mode
This is the most power-consuming mode. Regular operation at full clock speed (266MHz). The typical power consumption is 335mW in this mode.
We can dynamically reduce the CPU core clock speed to lower frequencies, if required.
Idle Mode
In this mode, FCLK to the CPU core is switched off. This reduces the power consumption to about half the typical 'Normal mode' consumption: 177mW
Wake-up sources
any interrupt.
Slow Mode
In slow mode, FCLK is tied to the external crystal, i.e. 12MHz in our case. The CPU core, SDRAM and bus clocks are also running at 12MHz.
This reduces the power consumption to typically 33mW.
Wake-up sources
none, we can just use our slowly running code to switch back to Normal mode, if it's required.
Power_off Mode
In Power_off mode, only the SDRAM is held in refresh, and the SoC-internal wake-up logic and RTC is powered. This means that the overall power consumption of the CPU goes down to max. 100uA, which translates to 200uW at 2.0V core voltage.
Wake-up sources
The number of wake-up sources is more restricted in this mode:
- EINT[0...15]
- RTC Alarm Interrupt
- nBATT_FAULT pin
System design considerations
In order to fully support Power_off mode, we need to
- Be able to switch off VDDi/VDDiarm/VDDi_MPLL/VDDi_UPLL separately from VDDalive, using a switch based on the PWREN signal
PCF50606 PMU
This is an overview of the PCF50606 power modes / state transitions
NOPOWER
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