Triggering
(continued)
I
2
C and SPI Triggering
Don’t spend your time sorting
through communication frames to
find the one of interest. Let
Agilent set up an Inter-Integrated
Circuit (I
2
C) or Serial Peripheral
Interface (SPI) trigger to sift
through the frames for you. And
like the CAN, LIN, and USB trig-
gers, I
2
C and SPI come standard
with the 54600-Series scopes.
The full range of I
2
C triggering
includes start or stop condition,
missing acknowledge, restart,
EEPROM data read, address
and/or data frame, or 10-bit
write. SPI triggering allows for
trigger on user-definable framing
and user-definable number of
bits per frame, as well as data
patterns.
Figure 8. Trigger on address and/or data
patterns within an I
2
C frame.
Figure 7. Trigger on data patterns within a SPI frame.
Microcontroller and
DSP Applications
Microcontrollers (MCUs) and
Digital Signal Processors (DSPs)
are here to stay, and are becoming
more pervasive in industrial,
communications, automobile, and
consumer products. Design engi-
neers must grapple with scopes
that were not developed to tackle
the mixed analog and digital
signals found in MCU- and
DSP-based designs. Many engi-
neers, who rely primarily on
typical 2-channel or 4-channel
scopes in mixed analog and digi-
tal signal verification and debug,
find these scopes to be inade-
quate when it comes to the chan-
nel count, memory depth, display
and triggering. The interactions
that occur in typical mixed analog
and digital design — taking a real-
world signal such as audio, video,
temperature or pressure, per-
forming some transformation on
the signal, and finally returning
that signal to the real world —
require more viewing capability
than current scopes can provide.
Agilent 54621D, 54622D, 54641D,
and 54642D mixed-signal
oscillscopes (MSOs) provide the
channel count, memory depth,
high-definition display, and
triggering that MCU and DSP
designs demand.
Figure 9. The 350 MHz and 500 MHz MSOs
are a great fit for DSP applications.
9
HP [ AGILENT(HEWLETT-PACKARD) ]
