NCD9830GEVB
http://onsemi.com
3
Power Supply
NCD9830 can be operated at supply voltage range
between 2.7 V & 5 V. The liberty of supply voltage variation
must be used with appropriate reference voltage selection
(see technical datasheet for more information). Link LK2 is
provided for appropriate supply voltage setting. Position B
corresponds to default value of 3.3V (internally generated)
while position A corresponds to externally supplied supply
voltage. The Board generates 3.3 V from the USB connector
provided. However, if any other operating voltage is
required then that must be supplied externally through J3.1
and J3.3 as explained in Table 2
.
The digital interface of the
PCB is operated at 3.3 V. If NCD9830 supply voltage is
selected any value other than 3.3 V then appropriate
management of SCL and SDA signals is required to allow
proper I
2
C operation. Links LK4 & LK5 serve this purpose.
Position A corresponds to 3.3 V operation (default)
whereas, position B corresponds to all other externally
supplied voltages according to the technical datasheet.
A guide to proper selection of Links and jumper is shown in
Table 3
.
Table 3. LINKS POSITIONS SELECTION
Selection
Links Positions
LK2
LK4
LK5
J5
3.3 V Supply Voltage with Internal Reference
B
A
A
OFF
3.3 V Supply Voltage with External Reference
B
A
A
ON
Externally Supplied Voltage with Internal Reference
A
B
B
OFF
Externally Supplied Voltage with External Reference
A
B
B
ON
Figure 3. Photograph of PCB Side Showing J5, LK2, LK4 & LK5
LK4 & LK5
LK2
J5
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