Figure 2: Picture of ADI USB-to-I2C Dongle (ADUSB2)
Setup Instructions:
Section 1 – Power Supply:
The SSM2518 evaluation board requires several different power supplies. The main power supplies required for
operation are
PVDD
(P3 or red banana jack) and
DVDD
(P4 or green banana jack). In addition to the main power
supplies, there are several other auxiliary power sections. The most basic setup for the SSM2518 evaluation board is
to generate all onboard power directly from
PVDD
utilizing jumper placements, eliminating the need for multiple power
supplies. The correct jumper settings for this mode are shown in
Figure 3.
LDO_POWER:
The SSM2518 board integrates two voltage regulators, U1 (3.3V) and U2 (1.8V). Note that the 3.3V
regulator powers most of the onboard digital audio interface circuitry. Inserting a jumper across P23 allows for PVDD
to power and activate these regulators. For current measurements on the PVDD pin of SSM2518, the device must be
isolated from this circuitry. In order to do so, remove the P23 jumper and connect an external power supply to P24 to
activate U1 and U2 voltage regulators.
IOVDD:
IOVDD is a generalized power supply that is selected from the output of one of the voltage regulators.
IOVDD can be selected as 1.8V or 3.3V by inserting a jumper across the designated pins of P2. From that point,
IOVDD can be selected to power several different features: It can power DVDD (P1), it can set the logic level of the
onboard digital audio circuitry (P16), and it can be used as the I2C pull-up voltage (P22).
DA_LEVEL:
This is the logic level for the onboard digital audio signals. It can either be generated by IOVDD, as
described above, or can be externally powered using P21. The logic level for these signals is established on U6 – U9.
I2CVDD:
This is the pull-up voltage for the I2C pins of SSM2518. This voltage can be set to either onboard IOVDD or
and external I2C pull-up by inserting a jumper across the designated pins of P22. The external power supply
connection is located on SK2.
