MAXQ3181 Maxim, MAXQ3181 Datasheet - Page 23

• Manufacturer Part Number: MAXQ3181
• Description: The MAXQ3181 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, active power and energy, and many other metering parameters of a polyphase load
• Manufacturer: Maxim

The virtual registers contain calculated values derived
from one or more real registers. They are calculated at
the time they are requested, and thus can involve addi-
Figure 7. Flowchart for Reading from MAXQ3181
SPI TIMEOUT (320ms)
Low-Power, Active Energy, Polyphase AFE
______________________________________________________________________________________
N
N
N
N
Y
SEND COMMAND BYTE 1
SEND COMMAND BYTE 2
DELAY > 400 SYSCLK
DELAY > 400 SYSCLK
DELAY > 400 SYSCLK
READ MAXQ3181
GET DATA BYTE
GET 0xC1?
GET 0xC2?
SEND 0x00
SEND 0x00
GET 0x4E?
GET 0x41?
DONE?
EXIT
tional time to return a value. Most virtual registers are 8
bytes in length and are delivered least significant byte
first.
Figure 8. Flowchart for Writing to MAXQ3181
SPI TIMEOUT (320ms)
N
N
N
N
N
Y
SEND COMMAND BYTE 1
SEND COMMAND BYTE 2
DELAY > 400 SYSCLK
DELAY > 400 SYSCLK
DELAY > 400 SYSCLK
WRITE MAXQ3181
SEND DATA BYTE
GET 0xC1?
GET 0xC2?
SEND 0x00
GET 0x41?
GET 0x4E?
GET 0x41?
DONE?
EXIT
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