ADSST-EM-2030 Analog Devices, ADSST-EM-2030 Datasheet - Page 4

• Manufacturer Part Number: ADSST-EM-2030
• Description: 3-Phase Electronic Energy Meter Chipset
• Manufacturer: Analog Devices

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DataSheet
ADSST-EM-2030
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.
4
U
SPI INTERRUPT
SAMPLE INPUT
DATA OUTPUT
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FOR 8712S
SCLK
MISO
MOSI
SCLOCK
SS
SS
t
t
SS
DF
MSB
t
SH
t
DAV
BIT 6
t
DSU
Figure 3. SPI Timing for Data Transmission Byte
MSB
MSB
Figure 2. SPI Communication Port Timing
t
DHD
BIT 5
t
SC
t
DF
DataSheet4U.com
BIT 4
t
DR
–4–
BITS6–1
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
2. The ADSST-EM-2030 will first respond with an acknowl-
BIT 3
the ADSST-EM-2030 chipset to read the desired data.
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.
BITS 6–1
BIT 2
t
SR
BIT 1
t
SF
LSB
LSB
LSB
t
SFS
?
REV. 0