STPMC1 datasheet(36/77 Pages) STMICROELECTRONICS

36 / 77 page

Theory of operation

STPMC1

36/77

Doc ID 15728 Rev 6

From signal PΣ (3-ph active energy), stepper motor driving signals MA and MB (see

Figure 12) are generated by means of internal divider, mono-flop and decoder and brought

to MOP and MON pins.

The numbers of pulses per kWh on MOP and MON outputs (CM) is related to the number of

pulses on LED pin (C, see par.

9.11) following the table below.

The mono-flop limits the length of the pulses according to the LVS bit value.

The decoder distributes the pulses to

MA and MB alternatively, which means that each of

them has only a half of selected frequency.

When a no-load condition is detected (

BIL=1) MOP and MON are held low because

integration of power is suspended.

The LED pin provides 3-phase active energy pulses according to the table below:

Figure 12.

Stepper driving signals

MON

Low

MOP

MON

Low

MOP

Table 20.

Configuration of MOP and MON driving signals with APL = 1, 2, 3

LVS (1 bit)

KMOT (2 bits)

Pulses Length

Freq. CM

31.25 ms

C/64

C/128

2C/32

C/256

156.25 ms

C/640

C/1280

C/320

C/2560

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