TDC7200_15 Datasheet, PDF (25/50 Pages) Texas Instruments – TDC7200 Time-to-Digital Converter for Time-of-Flight Applications in LIDAR,Magnetostrictive and Flow Meters

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TDC7200
SNAS647C – FEBRUARY 2015 – REVISED AUGUST 2015
8.6.2 CONFIG1: Configuration Register 1 R/W (address = 00h) [reset = 0h]
Figure 22. Configuration Register 1
7
6
5
4
FORCE_CAL PARITY_EN TRIGG_EDGE STOP_EDGE
R/W-0h
R/W-0h
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
3
START_EDGE
R/W-0h
2
1
MEAS_MODE
R/W-0h
R/W-0h
0
START_MEAS
R/W-0h
Table 2. Configuration Register 1 Field Descriptions
Bit Field
7
FORCE_CAL
6
PARITY_EN
5
TRIGG_EDGE
4
STOP_EDGE
3
START_EDGE
[2:1] MEAS_MODE
0
START_MEAS
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
00h
0
Description
0: Calibration is not performed after interrupted measurement (for example, due
to counter overflow or missing STOP signal)
1: Calibration is always performed at the end (for example, after a counter
overflow)
0: Parity bit for Measurement Result Registers* disabled (Parity Bit always 0)
1: Parity bit for Measurement Result Registers enabled (Even Parity)
*The Measurement Results registers are the TIME1 to TIME6,
CLOCK_COUNT1 to CLOCK_COUNT5, CALIBRATION1, CALIBRATION2
registers.
0: TRIGG is output as a Rising edge signal
1: TRIGG is output as a Falling edge signal
0: Measurement is stopped on Rising edge of STOP signal
1: Measurement is stopped on Falling edge of STOP signal
0: Measurement is started on Rising edge of START signal
1: Measurement is started on Falling edge of START signal
00: Measurement Mode 1 (for expected time-of-flight < 500 ns).
01: Measurement Mode 2 (recommended)
10, 11: Reserved for future functionality
Start New Measurement:
This bit is cleared when Measurement is Completed.
0: No effect
1: Start New Measurement. Writing a 1 will clear all bits in the Interrupt Status
Register and Start the measurement (by generating an TRIGG signal) and will
reset the content of all Measurement Results registers (TIME1 to TIME6,
CLOCK_COUNT1 to CLOCK_COUNT5, CALIBRATION1, CALIBRATION2) to
0.
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