EVALSTPM34, EVALSTPM33, EVALSTPM32 board

UM1748

12/17

DocID026226 Rev 1

A 22 nF capacitor in parallel with R2 implements an antialiasing filter for voltage signal.

Regarding to current signal, the antialiasing filter is given by a 10 nF capacitor and 1 kOhm

resistors.

2.2.8

LED

Two LEDs are connected to programmable LED pins of the device.

2.2.9

Clock

Clocking is provided to the board through 16 MHz quartz. 1 MOhm resistor and 15 pF

capacitors are used to filter noise.

2.2.10

Voltage reference

The STPM34 and STPM33 devices embed two internal independent voltage references.

shorted by J11.

2.3

Connection to the line

The board can be connected to line voltage and current in several ways, as shown in below

pictures.

Figure 7. Board connection to phantom load, dual-phase system (STPM34)

VL2

VL1

IL2

IL1

L2

L1

N

GIPG1004141240LM