ETAS ES1337.2, User Manual

Page: 19 / 29

Hardware Features 19
2.2 Analog Outputs
Each of the two analog voltage outputs of the ES1337.2 Signal Generator
Board can be configured so that
• the internal reference voltage or one applied from outside is used
• an analog signal or a digital signal derived from the output voltage is
output
• an output configured as digital is used as an open collector output or
as an open collector output with pull-up functionality
• the output is completely powered off
2.2.1 Reference Voltages
The internal reference voltage (= 10 V) or a voltage applied to the external
reference voltage input of the channel between -10.0 V and 10.0 V (see
"“OUTPUT 0-5” Signal Outputs" on page 21) are available.
The actual output voltage of the relevant channel is the product of the refer-
ence voltage and the control signal (with an analog configuration).
The reference voltage is selected in the “Globals” tab of the ES1337-Wheelsn-
srsim-DA Device (“Analog Reference Output #4, #5” option) in LABCAR-RTC.
2.2.2 Type of Output Signal
The digital signal is derived from the analog signal – the comparator threshold
corresponds to 1 V when using the internal reference or 0.1 x V
ext
when using
the external reference.
Selection takes place in the “Globals” tab of the ES1337-Wheelsnsrsim-DA
Device (“Configuration Output #4, #5” option) in LABCAR-RTC.
2.2.3 Disabling the Output
An analog channel is disabled in the “Signals” tab of the ES1337-Wheelsnsr-
sim-DA Device (“Enable_4” and “Enable_5” option) in LABCAR-RTC. The
channel output is high-impedance when disabled.
2.3 Synchronization Signal
To synchronize with external devices (e.g. an oscilloscope), one of the four
wheel speed sensors can output a “tooth 0-pulse” as a TTL signal at the
“SNYC” port.
The sensor this signal comes from is selected in LABCAR-RTC in the “Globals”
tab of the ES1337-Wheelsnsrsim Subsystem (“SYNC Port” option).