STEVAL-IPE008V1 STMicroelectronics, STEVAL-IPE008V1 Datasheet - Page 29

• Manufacturer Part Number: STEVAL-IPE008V1
• Description: BOARD EVAL STPM01/STR715FR0
• Manufacturer: STMicroelectronics
• Type: Other Power Managementr

Specifications of STEVAL-IPE008V1

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, ARM7
• Utilized Ic / Part: STPM01, STR715FR0
• Primary Attributes: 3-Ph Energy Meter (or Single Phase)
• Secondary Attributes: Measures Active, Reactive, Apparent Power
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: STPM01, STR715FR0
• Other names: 497-6412; STEVAL-IPE008V1

STPM01
8.15
Table 13.
LVS (1 Bit)
0
0
0
0
1
1
1
1
In a practical example where APL = 2, and the desired P is 64000 pulses/kWh (= 17.7
Hz*kW), we have:
K
This means that the reading of 0x00001 in the active energy register represents 7.63 µWh,
while 0xFFFFF represents 8 Wh.
Driving a stepper motor (standalone)
When used in standalone mode (APL = 2 or APL = 3), the STPM01 is able to directly drive a
stepper motor. From signal AW, a stepper driving signals MA and MB are generated by
means of internal divider, mono-flop and decoder. The MA and MB signals are brought to
the MOP and MON pins that are able to drive the stepper motor. Several kinds of selections
are possible for the driving signals according to the configuration bits LVS and KMOT.
The numbers of pulses per kWh (PM) in the MOP and MON outputs are linked with the
number of pulses of the LED P (see previous paragraph) pin with the following relationship:
Configuration of MOP and MON pins
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.
Negative power is computed with its own sign, and the MOP and MON signals invert their
logic state in order to make the backward rotation direction of the motor. See the diagram
below.
AW
= 7.63*10-6 Wh
KMOT (2 Bits)
0
1
2
3
0
1
2
3
Doc ID 10853 Rev 7
Pulses length
156.25 ms
156.25 ms
156.25 ms
156.25 ms
31.25 ms
31.25 ms
31.25 ms
31.25 ms
Theory of operation
P/1280
P/2560
P/128
P/256
P/640
P/320
P/64
P/32
PM
29/60