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Rabbit 6000 User’s Manual
digi.com
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37.5 Power and Current Consumption
Several mechanisms contribute to the current consumption of the Rabbit 6000 processor while it is operat-
ing. Current that is proportional to the voltage alone is due to the power consumption of the internal logic.
The other current draw component is dependent on both voltage and frequency. Since the operating volt-
age is fixed, the primary way to reduce current consumption is by reducing the clock speed by either
adjusting or disabling the PLL, dividing the main clock, or running off the 32kHz oscillator. See Table 36-
2 for more details.
The Ethernet and Wi-Fi peripherals in particular can draw a significant amount of current when powered,
as shown in Table 37-5. Exercise care that they are only enabled when being used.
37.5.1 Sleepy Mode Current Consumption
The Rabbit 6000 supports designs with very low power consumption by using features such as the ultra-
sleepy modes and self-timed chip selects. At the low frequencies possible in the ultra-sleepy modes (as
low as 2 kHz), the external memory devices become significant factors in the current consumption unless
one of the short or self-timed chip selects is used. The I/O current use will vary with pin activity.
Table 37-9. Typical Sleepy Mode Current Consumption
(-40°C to +85°C)
Pin
Voltage
Current
I
CORE
1.2 V
5 mA
I
IO
3.3 V
6 mA
Содержание 6000
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