78M6612 Split-Phase Evaluation Board User Manual
UM_6612_044
Split Phase
AC Source
Host PC
78M6612 SP Eval Board
ACDC
Switcher
12VDC
3V3 Reg
Current
Shunt
USB
USB
Controller
UART
6612
Voltage
Divider
Voltage
Divider
Relay
Relay
10x DIOs I2C
Split Phase
AC Load Under Test
Figure 4: 78M6612 Split-Phase Evaluation Board Application Diagram
The 78M6612 Split-Phase Evaluation Board is preconfigured to measure the Load currents present on
Line 1 and Line 2 using two current transformers (CT). Alternatively, the board has provisions the replace
the Line 1 CT with a current sensing shunt in series with the Neutral wire. Two resistors (R18 and R43)
provide the sensor selection. The following table provides the resistor population options for selecting the
CT versus the shunt.
Table 2: Line 1 versus Neutral Current Sensing Configuration
Sensor Configuration
CT – Line 1
R18
R43
No Component
Install 750Ω
Install 750Ω
No Component
Shunt - Neutral
Presently the firmware only supports the CT–Line1 configuration.
2.2
Relay Configuration
The CLI commands support separate Line 1 and Line 2 relays. However, the 78M6612 Split-Phase
Evaluation Board uses DIO7 to control both Line 1 and Line 2 relays so that control of power to both
remains in sync.
10
Rev. 1.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
