STPM14 STMicroelectronics, STPM14 Datasheet - Page 28

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

Theory of operation
7.16
Table 15.
28/43
Signal
PUMP
Name
CSEL
WE
RD
Value
Mode signals
The STPM1X includes four Mode signals. These signals change some of the operation of
the STPM1X. The mode signals are not retained when the STPM1X supply is not available
and then they are cleared when a POR occurs.
The mode signals bit can be written using the normal writing procedure of the CFGI
interface (see CFGI par. 7.17)
Mode signals description
Bit
0
1
0
1
0
1
0
1
– RD mode signal has been already described in par. 7.15 (configuring the STPM1X),
– PUMP. When set, the PUMP mode signal transforms the MOP and MON pins to act
– CSEL (STPM13/14 only). Under normal operating conditions, if anti-tamper module is
– WE (write Enable): This mode signal is used to permanently write to the OTP anti-
but there is another implied function of the signal RD. When it is set, each sense
amplifier is disconnected from corresponding anti-fuse element and this way, its 3V
NMOS gate is protected from the high voltage of V
operation. This means that as long as the V
signal RD should be set.
as driving signals to implement a charge-pump DC-DC converter (see
This feature is useful in order to boost the V
generate the V
elements.
not activated (see PST configuration bits) the STPM1X will selects channel 1 as the
source of current information. For debug or calibration purposes, it is possible to
select channel 2 as source of current channel signal when the tamper module is
disabled. This is done by setting CSEL mode bit.
fuse element. When this bit is not set, any writing to the configuration bit is recorded
in the shadow latches. When this bit is set, the writing is recorded both in the shadow
latch and in the OTP anti-fuse element.
MOP and MON operate normally
MOP and MON provide the driving signals to implement a
charge-pump DC-DC converter
Current Channel 1 selected when tamper is disabled
Channel 2 selected when tamper is disabled
The 56 Configuration bits originated by OTP anti-fuses
The 56 Configuration bits originated by shadow latches
Any writing in the configuration bits is recorded in the shadow
latches
Any writing in the configuration bits is recorded both in the
shadow latches and in the OTP anti-fuse elements
OTP
voltage (14V to 20V) needed to program the OTP anti-fuse
Status
OTP
CC
supply voltage of the STPM1X to
voltage reads more than 3V, the
OTP
during permanent write
Command
0111000x
1111000x
0111100x
1111100x
0111101x
1111101x
0111110x
1111110x
Binary
STPM11/12/13/14
Figure 23.
Command
FC or FD
7C or 7D
7A or 7B
FA or FB
F0 or F1
F8 or F9
70 or 71
78 or 79
Hex
).