NCN8024GEVB Series
http://onsemi.com
2
Test Procedure
See Figure 2.
Initial Setups (Figure 2)
The initial setups given here are recommended before
starting measurements on the board.
Set the CMDVCC/in the OFF Position (High)
Set CLKDIV1 and CLKDIV2 into Low Position
(Lowest Frequency Fclkin)
Set 5V/3Vbar into a 5V Position
As a Precaution, Turn the 1 k
W
Potentiometer to Obtain
a Resistor Output Value of 1 k
W
, and then Connect the
Jumper
DC Power Supplies
Two power supplies are used to bias the demo board.
V
DDP
is the input voltage of the DC-DC converter. V
DD
is
the “digital” power supply which biases the input stages of
the NCN8024 device (control and signal inputs).
V
DD
and V
DDP
must be connected to the board for a
correct operation.
Connect the V
DD
Power Supply Using the 2 Pin Male
Connector J1
Connect the V
DDP
Power Supply Using the 2 Pin Male
Connector J2
Power up V
DDP
in the Range 4.5 V–5.5 V
Power up V
DD
in the Range 2.7 V–5.5 V
Clock Frequency
CLKDIV1 and CLKDIV2 select the frequency divider
according to the Table 2.
Table 2. CLOCK FREQUENCY
CLKDIV1
CLKDIV2
Divider
1
0
DIV 1/1
1
1
DIV 1/2
0
1
DIV 1/4
0
0
DIV 1/8
Card Presence
The socket we use is a normally open, so CDR-PRES/ has
been chosen; nevertheless the CRD_PRES and
CRD_PRES/ test points can also be used for signaling the
presence of a card and starting up the circuit.
Start the Measurement
To start the measurements, set the board as it follows:
Set CLKDIV1 and CLKDIV2 to Select the Correct
Frequency
Set 5V/3Vbar to Select the Correct Output Voltage
Jumpers:
1 k
W
Potentiometer Jumper: Not Connected to Start
Measurement
Finally, Toggle/CMDVCC from High to Low to Start
the Device (Activation Sequence Run)
Figure 2. SOIC
−
28 Board Description (Equivalent for TSSOP
−
28)
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