101-1017 Rabbit Semiconductor, 101-1017 Datasheet - Page 46
101-1017
Manufacturer Part Number
101-1017
Description
KIT DEV POWERCORE 3800 INT'L
Manufacturer
Rabbit Semiconductor
Series
PowerCore FLEXr
Type
MPU Moduler
Datasheet
1.101-1007.pdf
(240 pages)
Specifications of 101-1017
Contents
RabbitCore Module, Dev. Board, AC Adapter, Cable and Dynamic C® CD-Rom
Processor To Be Evaluated
PowerCore 38xx
Interface Type
Ethernet
For Use With/related Products
RCM3800
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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4.4 Ramp Generator
The PowerCore module has an onboard ramp generator that provides a a continuous
sawtooth function with a precision rising ramp. The calibration of the ramp is tied to an
onboard 2.5 V voltage reference. The 400 Hz ramp has a linear rise time from 0 to 3.1 V of
approximately 1.9 ms, and ramps down in approximately 0.45 ms. (The ramp actually
starts at a slightly negative voltage of approximately -0.05 V.) The ramp output has a
linearity of about 0.1% and is available for external circuits on pin 50 of header J4.
Figure 9. PowerCore Ramp Generator Signal
The onboard 2.5 V reference circuit is shown in Figure 10.
W
W
W
Figure 10. Onboard 2.5 V Reference
The ramp generator makes it possible to measure analog voltages using LM339 compara-
tors and the pulse capture capabilities of the Rabbit 3000 microprocessor to convert time
into voltage. One example of this analog measurement capability is the onboard ther-
mistor, which allows temperature measurements of the PowerCore circuit board.
38
PowerCore FLEX
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