STPM01_11 STMICROELECTRONICS [STMicroelectronics], STPM01_11 Datasheet - Page 31

• Manufacturer Part Number: STPM01_11
• Description: Programmable single phase energy metering IC with tamper detection
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STPM01
Table 14.
1. * Type0 is the Wide band Active Energy and Type1 is the fundamental Active Energy if FUND=0, if FUND=1 they are
8.17
swapped.
KMOT (2 Bits)
It is expected that an application microcontroller should access the data in the metering
device on regular basis at least 1/s (recommended is 32/s). Every latching of results in the
metering device requested from the microcontroller also resets the watchdog. If latching
requests does not follow each other within 1.6 second, an active high pulse on MON is
produced, because device assumes that microcontroller does not operate properly. An
application can use this signal either to control the RESET pin of its microcontroller or it can
be tied to some interrupt pin. The last possibility is recommended for a battery backup
application which can enter some sleep mode due to power down condition and should not
be reset by metering device because it would exit from the sleep mode.
The LED pin can be driven from AW wide band (active energy as in standalone mode), AW
limited at fundamental, RW (reactive energy) or SW (apparent energy) according to the
value of KMOT bit.
LED pin configuration in peripheral mode
In this case, since the LED pin is driven by signals different from AW, some other
relationship between the LSB of the register and must be defined:
K
K
K
APL = 1:
MOP provides the ∑ Δ signal generated from the analog voltage input;
MON provides the ∑ Δ signal generated from the analog current input, according to the
selection of the tamper module
LED provides the information about the selection of the current channel made by the tamper
module. If LED is low it means the primary channel is selected, if LED is high the secondary
channel is actually selected.
Status bits
The STPM01 includes 8 status bits that provide several information on the current meter
status. The status bits are the following:
AWFund
RW
SW
0
1
2
3
= 2*K
= K
AW
= 4*K
AW
[VAh]
[VARh]
AW
[Wh]
Signal available in LED pin
Doc ID 10853 Rev 8
AW Type 0
AW Type 1
RW
SW
(1)
(1)
# of Pulses
P [kVARh]
Theory of operation
P [kVAh]
P [kWh]
P [kWh]
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