STPM14 STMicroelectronics, STPM14 Datasheet - Page 24

• Manufacturer Part Number: STPM14
• Description: (STPM11 - STPM14) Single phase energy metering IC
• Manufacturer: STMicroelectronics

Theory of operation
Figure 19. Positive energy or absolute computation energy (ABS=1) stepper driving signals
Figure 20. Negative energy stepper driving signals
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When a no-load condition is detected MOP and MON are held low.
Configuring the STPM1X
All the configuration bits that control the operation of the device can be written temporarily or
permanently. For temporary writing, the configuration bits value are written in the Shadow
Registers which are simple latches that hold the configuration data. For permanent writing,
the configuration bits are stored in the OTP (one time programmable) cells that keep the
information for an undefined period of time even if the STPM1X is without supply, but, once
written, they cannot be changed. The temporary writing is useful mainly during testing of the
device or during the calibration phase. All the configuration parameters can be changed an
infinite number of times in order to test the device operation.
The shadow registers are cleared whenever a reset condition occurs.
The configuration bits are different for STPM11/12 and for STPM13/14 due to the presence
of the Tamper module. Each of them consists of paired elements, one is latch (the OTP
shadow), and one is the OTP anti-fuse element. When the STPM1X is released in the
market, all anti-fuses represent logic low state but they can be written by the user in order to
configure the STPM1X. This means that STPM1X can retain these bits of information even if
it has been unsupplied for an undefined time. That's why the CFG signals are used to keep
certain configuration and calibration values of the device.
Hi
Lo
Hi
Lo
Hi
Lo
Hi
Lo
MON
MON
MOP
MOP
STPM11/12/13/14