S i 8 9 0 x - P W R - E V B
8
Rev. 1.1
Figure 6. AC Line and Load Connections to Barrier Strip TB1 (Top of Board View)
6. Connect the loose ends of the AC_OUT and AC_H wires from TB1 to the load (e.g. power resistor, lamp, etc.).
7. Replace the top cover of the enclosure and secure with four screws. Examine the ac line side of the enclosure
and verify that the ac lines external to the enclosure have no bare wire exposed.
8. Locate the male connector that mates to output side connector P1 (see Figure 5) and test fit to connector to P1.
Remove the connector from P1. Cut nine equal lengths of AWG28 wire, each one eight inches long. Strip 1/4
inch of insulation from each end of all eight wires. Solder one end of each wire to each wire to the male
connector. When soldering is complete, plug the male connector into P1.
9. Obtain an external adjustable power supply (bench or lab supply), but do not connect it to the Si890x EVB yet.
With no load attached, turn the power supply on and set the output to 3.3 V. Turn the power supply off and
discharge its outputs by shorting the positive and negative terminals together.
10.Connect the dc supply outputs to the VDDB and GNDB input pins of P1, as shown in Figure 7.
11. Turn the oscilloscope on and connect oscilloscope probes to the DAC0 and DAC1 output pins of P1, as shown
in Figure 7.
Figure 7. Low Voltage Connections to Output Connector P1
TB
1
AC_OUT AC_H
3.3V
AIN2
AC_H
GNDA
AC
Line
Output
Load
Hot
Side
Neutral
Nine
‐
Pin
Connector
(End
View)
5
2
6
3
1
4
8
9
7
PCB
2
GNDB
3
D0
4
D1
5
SDI
6
/EN
7
DAC0
8
DAC1
9
Not
Used
1
VDDB
PIN#
FUNCTION
