Physical Layer - CAN System Engineering - page 97

Table 2.5 Error criteria for the evaluation of RxD, ERR and INH
Operational
mode

Test Transmit

signal

Maximum amplitude deviation Maximum timing

deviation

RxD ERR INH RxD ERR INH

Normal DPI, pulse With ± 0.9 V ± 0.9 V −5 V ± 200 ns - -

Standby DPI, pulse Without ± 0.9 V - −5 V - - -

Sleep DPI, pulse Without ± 0.9 V - + 2 V - - -

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Fig. 2.40 Measurement set-up for DPI tests

The error criteria for the evaluation of pins RxD, ERR and INH is listed in
Table 2.5 . These error criteria are applied to all three nodes of the minimum network
simultaneously, which means that any signal of any one of the transceivers exceeding
the maximum specified deviations for amplitude or timing is interpreted as malfunction.
No timing criteria are applied for evaluation in standby or sleep mode and basically
for error pin and INH pin, because in these cases static signals are to be evaluated. For
evaluation of non-disturbed communication, an RxD mask test is applied. The applied
mask is derived from a non-disturbed RxD signal of the minimum network.

Test Mock-Up and Execution of DPI Tests, Transients Tests and Emissions Tests

The above-described parts of the minimum network are implemented on a test
board, which is applied to all three test groups (DPI, transients and EME).
Figure 2.40 shows the measurement set-up used for DPI tests. The HF noise is
induced into the minimum network through one of the DPI coupling circuitries in