MAX11270 Datasheet, PDF (23/46 Pages) Maxim Integrated Products – Integrated PGA

MAX11270
24-Bit, 10mW, 130dB SNR, 64ksps Delta-Sigma
ADC with Integrated PGA
Table 5. MAX11270 Command Behavior from Pin (RSTB, SYNC) and SPI (RESET, SYNC_SPI)
(continued)
COMMAND
ISSUED
COMMAND-
ISSUED VIA
STATE
BEFORE
COMMAND
STATE
AFTER
COMMAND
TRANSITION
TIME (MAX)
COMMAND INTERPRETATION AND
RESULTING CHIP STATE
STBY
Calibration
Conversion
STBY
Calibration
Conversion
—
SYNC ignored, chip remains in STBY mode
—
SYNC ignored
—
Pulse SYNC mode, conversions restart
SYNC
SPI, PIN
Conversion Conversion
Continuous SYNC mode, 1^st SYNC rising
edge set clock counter, subsequent rising
edges are compared against clock counter.
If count is off by more than ±1 clock counts
then restart conversions otherwise do nothing
—
and continue conversions in progress. If a
SYNC rising edge occurs before the first
RDYB asserts after conversions are started
then SYNC is ignored. Once the first RDYB
asserts, all subsequent SYNC rising edges
are evaluated.
CMD Register
Write
Convert
Command
Write
STBY
STBY
SLEEP
SLEEP
SPI
Calibration
STBY
Conversion
STBY
STBY
Conversion
SLEEP (SPI) Conversion
SPI
Calibration Conversion
Conversion Conversion
—
Chip remains in standby
—
Chip remains in SLEEP
—
Calibration stops, chip goes to STBY mode
—
Conversion stops, chip goes to STBY mode
—
Exit standby, conversion starts
—
Exit SLEEP mode, conversion starts
—
Calibration stops then a new conversion starts
—
Conversion stops and a new conversion starts
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