668-0010 Rabbit Semiconductor, 668-0010 Datasheet - Page 260
![no-image](/images/no-image-200.jpg)
668-0010
Manufacturer Part Number
668-0010
Description
IC MPU RABIT3000 55.5MHZ 128LQFP
Manufacturer
Rabbit Semiconductor
Datasheet
1.20-668-0011.pdf
(312 pages)
Specifications of 668-0010
Rohs Status
RoHS non-compliant
Processor Type
Rabbit 3000 8-Bit
Speed
55.5MHz
Voltage
2.5V, 2.7V, 3V, 3.3V
Mounting Type
Surface Mount
Package / Case
128-LQFP
Features
-
Other names
316-1016
- Current page: 260 of 312
- Download datasheet (2Mb)
27.5.2 Battery-Backed Clock Current Consumption
For the battery-backed features of the Rabbit 3000 to perform while the processor is pow-
ered down, both the VBAT and BATIO 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 1.8 V during powerdown even if the proces-
sor is running at 3.3 V normally. A circuit to switch between a 1.8–2.0 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.
Table 27-12 shows the typical current consumption for these pins while the remainder of
the Rabbit 3000 is powered down.
250
Table 27-12. Typical Battery-Backed Current Consumption
Figure 27-8. Switching Circuit for VATIO Pin
VBAT
Pin
(-40°C to +85°C)
Voltage
3.3 V
1.8 V
Rabbit 3000 Microprocessor User’s Manual
Current
7 µA
1 µA
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