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Rabbit 6000 User’s Manual
digi.com
428
37.5.2 Battery-Backed Clock Current Consumption
For the battery-backed features of the Rabbit 6000 to operate while the processor is powered down, both
the VBAT and VBATIO pins need to be supplied properly. The VBAT pin powers the internal real-time
clock and the battery-backed SRAM, while VBATIO powers the /RESET, /CS1, CLK32K, and RESOUT
pins.
Note that the VBATIO pin can be powered at 1.2 V during powerdown even if the processor is running at
3.3 V normally. A circuit to switch between a 1.2–2.0 V battery and the main power can use the RESOUT
pin to switch the power source for the VBATIO pin. R is a current-limiting resistor that should be adjusted
for the battery voltage; a good value to use for a 3.0 V battery is 150 k
.
Figure 37.5 Switching Circuit for VBATIO Pin
Table 37-10 shows the typical current consumption for these pins while the remainder of the Rabbit 6000
is powered down.
Table 37-10. Typical Battery-Backed Current Consumption
(-40°C to +85°C)
Pin
Voltage
Current
VBAT
1.2 V
to be
determined
VBATIO
1.2 V
to be
determined
Summary of Contents for 6000
Page 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Page 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
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Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Page 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...