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STPM11 bảng dữ liệu(PDF) 32 Page - STMicroelectronics

tên linh kiện STPM11
Giải thích chi tiết về linh kiện  Single phase energy metering IC with pulsed output and digital calibration
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STPM11 bảng dữ liệu(HTML) 32 Page - STMicroelectronics

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Theory of operation
STPM11, STPM12, STPM13, STPM14
32/46
Doc ID 13167 Rev 8
t1 → t2 (>30ns): CFGI out of idle state
t2 → t3 (>30ns): CFGI enabled for write operation
t3: data value is placed in SDA
t4: SDA value is stable and shifted into the device
t3 → t5 (>10µs): writing Clock period
t3 → t5: 1 bit Data value
t5 → t6: 6 bits address of the destination latch
t6 → t7: 1 bit EXE command
t8: end of CFGI writing
t9: CFGI enters idle state
The same procedure should be applied for the mode signals, but in this case the 6-bits
address must be taken from the Table 15.
The lsb of command is also called EXE bit because instead of data bit value, the
corresponding serial clock pulse is used to generate the necessary latching signal. In this
way the writing mechanism does not need the measurement clock in order to operate, which
makes the operation of CFGI module of STPM1x completely independent from the rest of
the device logic except from the signal POR.
Commands for changing system signals should be sent during active signals SCS and SYN-
NP as it is shown in the Figure 21 -. A string of commands can be send within one period of
active signals SCS and SYN-NP.
Figure 21.
Timing for writing configuration and mode bits
Obsolete
Product(s)
- Obsolete
Product(s)



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