TDC1011_15 Datasheet, PDF (20/49 Pages) Texas Instruments – TDC1011 Single Channel Ultrasonic Sensing Analog Front End (AFE) for Level Sensing,Concentration Sensing Applications

TDC1011
SNAS662 – JULY 2015
Device Function Description (continued)
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NOTE
Although the SPI block is always active, it is not recommended to perform configuration
changes while the device is active. Configuration changes should be performed while the
device is in the SLEEP state or in the READY state.
If the EN pin is high and a trigger signal is received, the state machine will begin the execution of the configured
measurement. The state machine will return to the SLEEP state after the measurement is completed.
The device can be forced to exit a measurement by applying a logic high on the RESET pin high or a logic low
on the EN pin.
SW Reset
Timeout = 1 ^{EN = Low}
HW Reset
SLEEP state
EN = High
ERROR_FLAGS register (0x07):
N Writing 1 to bit [1] of the ERROR_FLAGS
register cancels any active measurement
tNot
and returns to sleep mode or ready mode
and sets Count to 0 and CH-flag to FALSE.
Ready
Trigger
pulse?
Yes
TX Burst
Output START
Pulse
RX Active
Output
STOP pulses
Mode?
Figure 28. Simplified TDC1011 State Machine Diagram
20
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