STPMC1 ST Microelectronics, STPMC1 Datasheet - Page 34

• Manufacturer Part Number: STPMC1
• Description: Programmable poly-phase energy calculator IC
• Manufacturer: ST Microelectronics

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Theory of operation
9.13
Figure 11. Stepper driving signals
Table 19.
34/76
LVS (1 bit)
0
1
Driving a stepper motor - standalone operating mode
(configuration bits: APL, LVS, KMOT)
When used in standalone mode (APL[1] = 1), the STPMC1 is able to directly drive a stepper
motor.
From signal P (3-ph active energy), stepper motor driving signals MA and MB (see
Figure 11
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.
Configuration of MOP and MON driving signals with APL = 1, 2, 3
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:
) are generated by means of internal divider, mono-flop and decoder and brought
KMOT (2 bits)
Low
Low
Low
Low
Hi
Hi
Hi
Hi
0
1
2
3
0
1
2
3
Doc ID 15728 Rev 1
9.11
) following the table below.
Pulses Length
156.25 ms
31.25 ms
MON
MON
MOP
MOP
Freq. CM
C/1280
C/2560
C/128
C/256
C/640
C/320
C/64
C/32
STPMC1