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ADSST-EM-2030 Datasheet(PDF) 4 Page - Analog Devices

Part # ADSST-EM-2030
Description  Three-Phase Energy Meter Chipset
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADSST-EM-2030 Datasheet(HTML) 4 Page - Analog Devices

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REV. 0
–4–
ADSST-EM-2030
SCLK
SS
MISO
MOSI
MSB
MSB
BITS 6–1
BITS6–1
LSB
LSB
t
SS
t
DF
t
SH
t
DAV
t
DSU
t
DHD
t
SC
t
DF
t
DR
t
SFS
t
SR
t
SF
Figure 2. SPI Communication Port Timing
SCLOCK
SS
SAMPLE INPUT
DATA OUTPUT
SPI INTERRUPT
FOR 8712S
MSB
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
LSB
?
Figure 3. SPI Timing for Data Transmission Byte
SPI FUNCTIONS
Three specific functions can be performed on the SPI commu-
nication port on the ADSST-EM-2030 chipset:
Data Read—The external microcontroller can read the data
from the ADSST-EM-2030 by sending specific commands; this
includes metering data, constants, and so on.
Data Write—The external microcontroller can send data to the
ADSST-EM-2030 to be stored in its internal nonvolatile memory;
this includes calibration and configuration constants, and so on.
Special Commands—The external microcontroller can send
special commands to the ADSST-EM-2030 for performing specific
functions. These commands do not have any data.
Data Read
The microcontroller being the master for the SPI communication,
has to send the desired commands for getting data from ADSST-
EM-2030. For the data transfer to take place, the following
sequence of operations must take place:
1. The microcontroller should send the specific command to
the ADSST-EM-2030 chipset to read the desired data.
2. The ADSST-EM-2030 will first respond with an acknowl-
edgment to the microcontroller within 5 ms that it has
received the command. To send the acknowledgment, the
ADSST-EM-2030 adds 0x30 to the received command,
and which is then sent back to the microcontroller.


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