AN725 データシートの表示（PDF） - Silicon Laboratories
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AN725 Datasheet PDF : 28 Pages
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AN725
4.5. Adaptive Voltage Scaling
SiM3L1xx devices have scalable LDOs powering the digital and memory modules on the device. These LDO
outputs are factory calibrated to 1.8 V to handle all process and temperature variations, but this voltage is often
much higher than the minimum voltage required by the digital and memory circuits. During normal operation, these
LDO outputs can be set to a value less than 1.8 V to reduce the amount of excess power consumed by these
circuits with some buffer to ensure correct operation.
When the digital or memory LDOs are sourced from the dc-dc converter, adaptive voltage scaling can also allow
the LDOs to track the dc-dc output voltage to utilize the higher efficiency of the dc-dc converter and reduce the
losses in the regulators.
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AHB Clock (MHz)
Digital LDO output fixed at 1.8 V
Digital LDO output scaled once at production test
Digital LDO output scaled adaptively by firmware
Figure 3. Reducing Power Consumption with Adaptive Voltage Scaling
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Rev. 0.1
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