TDC-GP22 datasheet(44/93 Pages) AMSCO

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TDC-GP22

acam messelectronic gmbh - Friedrich-List-Str.4 - 76297 Stutensee - Germany - www.acam.de

3-21

2. ’h01, Start_TOF: triggers a sequence for a single time-of-flight measurement. First, the

4 MHz oscillator is switched on. After the delay set to settle the oscillator

(START_CLKHS), the comparator and the reference voltage are switched on. The

receiver capacitor is charged up th Vref while inactive fire buffer is pulled down to

GND. After the delay set to charge up the capacitor (TW2), the fire buffer sends the

fire pulses. After the delay set in DELVAL the TDC stop channel is open. At the end of

the measurement the analog section and the 4 MHz are switched off and the current

consumption drops down to near zero. The interrupt is set, pin INTN = LOW.

3. ’h05, Start_TOF_Restart: This opcode runs the Start_TOF sequence twice, in up and

down direction as it is typical in ultrasonic flow meters. The interrupt is set, pin INTN =

LOW, when the time measurement for each direction is finished. So, for one

Start_TOF_Restart command the microprocessor sees two interrupts and has to read

twice. The time interval between the up and down measurement is set by configuration

parameter CYCLE_TOF in multiples of 50 Hz or 60 Hz. The right selection of the delay

between the two measurements suppresses 50/60 Hz noise.

CYCLE_TOF

factor HZ60 = 0(50Hz)

HZ60 = 1(60Hz)

20 ms

16.67 ms

1.5

30 ms

25.00 ms

40 ms

33.33 ms

2.5

50 ms

41.67 ms



’h02, Start_Temp: triggers a single temperature measurement sequence. It begins

with the fake measurements (ANZ_FAKE) on port PT0. Then it measures ports PT0

> PT1 > PT2 > PT4. If TEMP_PORTDIR is set one then the sequence of ports is

inverted, starting with the fake measurements at port PT4.



’h06, Start_Temp_Restart: This opcode runs the Start_Temp sequence twice. The

time interval between the up and down measurement is set by configuration

parameter CYCLE_TEMP in multiples of 50 Hz or 60 Hz. The right selection of the

delay between the two measurements suppresses 50/60 Hz noise.

CYCLE_TEMP

factor

HZ60 = 0 (50Hz)

HZ60 = 1 (60Hz)

20 ms

16.67 ms

1.5

30 ms

25.00 ms

40 ms

33.33 ms

2.5

50 ms

41.67 ms

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