Evaluation Board Configuration; Setting Up The Evaluation Board - Analog Devices UG-358 User Manual

Evaluation Board User Guide

EVALUATION BOARD CONFIGURATION

SETTING UP THE EVALUATION BOARD

The EVAL-ADM3054EBZ allows the
transceiver to be quickly and easily evaluated. The evaluation
board allows all of the input and output functions to be exercised
without the need for external components.
On the EVAL-ADM3054EBZ, the power is isolated between a
single 3.3 V or 5 V supply on VDD1, the logic side, and a single
5 V supply provided on VDD2, the bus side. When the part is in
recessive mode and actively switching states at 1 Mbps, the typical
supply current from VDD1 (I
DD1
in the recessive state, the supply current from VDD2 (I
typically less than 10 mA; in the dominant state, it is typically less
than 75 mA; and when actively switching states at 1 Mbps, it is
typically less than 55 mA with a default 60 Ω load installed.
The bus voltage sense pin (V
connected on the bus side. A low on VDD2SENSE indicates
that power is available on the bus side, and a high on
VDD2SENSE indicates that power is absent from the bus side.
VDD1 and VDD2 are the power supplies of the logic and bus
sides, respectively. A 22 µF decoupling capacitor, C1, is fitted at
the connector between VDD1 and GND1. Capacitors of 100 nF
and 1 µF are fitted on the V
DD1
decoupling from GND1 and GND2.
An example operation of the
Figure 3. Connect a signal generator on TXD and set up a
SIGNAL
GENERATOR
GND1
J3
VDD2SENSE
J5 RXD
RXD
J7
TXD
TXD
J6
3.3V OR 5V
POWER
SUPPLY
ADM3054 isolated CAN
) is less than 3 mA. When the part is
) is
DD2
), detects when VDD2 is
DD2SENSE
and V pins, respectively,
DD2
EVAL-ADM3054EBZ is shown in
5V POWER
SUPPLY
EVAL-ADM3054EBZ
VDD2
VDD2SENSE
LK1
CANH
B
RXD CANL
A TXD
A
VDD1 GND1
B
LK2
J1
Figure 3. Basic Isolated CAN Transceiver Evaluation Board Operation
500 kHz square wave clock with output swing between 0 V and
5 V. Connect the oscilloscope probes to the CANH and CANL
test points. A plot of the oscilloscope for TXD, RXD, CANH,
and CANL is shown in Figure 2. Channel 1 shows the TXD
signal, Channel 2 and Channel 3 show the CANH and CANL
signals, respectively, and Channel 4 shows the RXD signal.
1
4
2
CH1 2.00V
CH3 2.00V
J4
GND2
CANH
SH
VREF
CANL
GND2
GND2
J2
Rev. 0 | Page 3 of 8
T
CH2 2.00V M1.00ms
CH4 2.00V
T 50.00%
Figure 2. TXD, RXD, CANH, and CANL Signals
OSCILLOSCOPE
UG-358
A CH1 1.80V