STPM11ATR STMicroelectronics, STPM11ATR Datasheet - Page 25

• Manufacturer Part Number: STPM11ATR
• Description: IC ENERGY METER 1 PHASE 20TSSOP
• Manufacturer: STMicroelectronics

Specifications of STPM11ATR

• Input Impedance: 100 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 1.5V
• Voltage - I/o Low: 0.8V
• Current - Supply: 4.7mA
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Meter Type: Single Phase
• Output Voltage: +/- 0.4 V
• Output Current: 150 mA
• Input Voltage: 3 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5984-2

STPM11, STPM12, STPM13, STPM14
Table 13.
7.14
Table 14.
LVS (1 Bit)
KMOT (2 Bits)
0
0
0
0
1
1
1
1
Different settings for led signal
Due to the innovative and proprietary power calculation algorithm, the frequency signal is
not affected by any ripple at twice the line frequency. This feature strongly reduces the
calibration time of the meter.
Driving a stepper motor
The STPM1x is able to directly drive a stepper motor. An internal divider (mono-flop and
decoder) generates stepper driving signals MA and MB from signal AW. 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 - 7.13) 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 one 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.
0
1
2
3
KMOT (2 Bits)
0
1
2
3
0
1
2
3
Doc ID 13167 Rev 7
APL=0
Pulses
P
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
Pulses
APL=1
P/128
P/256
P/64
P/32
P/1280
P/2560
P/128
P/256
P/640
P/320
P/64
P/32
PM
25/46