TDC-GP22 datasheet(67/93 Pages) AMSCO

67 / 93 page

Ultrasonic-Flow-Converter

TDC-GP22

4-22

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

4.4.1

Configuration

The relevant configuration parameters are:

Table 4-3: First Wave Mode Configuration

Reg

Bits

Parameter

Description

EN_FIRST_WAVE

1 = Switches on the First Wave Mode, Reg3,

DELVAL2 and Reg4, DELVAL3 get a new meaning.

8 - 12

OFFS

2‘s complement number setting the offset shift in 1

mV steps

0 = 0 mV

1 = +1 mV

...

15 = +15 mV

16 = -16 mV

17 = -15 mV

...

31 = -1 mV

OFFSRNG1

1 = Additional offset shift by - 20 mV

OFFSRNG2

1 = Additional offset shift by + 20 mV

8 - 25

DELREL1 to DELREL3 Stop masking, select the xth wave for time-of-flight

measurement. Maximum is the 63rd wave. DELREL1

 DELREL1 to DELREL3 have to be set in

ascending order. Example:

DELREL1 = 3, DELREL2 = 4, DELREL3 = 5 means to

measure 3rd, 4th and 5th wave after the first wave

DIS_PW

0 = switch on / 1 = switch off pulse width

measurement. The ratio can be read from address

8, register PW1ST as an 8 bit fixed point number

with one integer bit (range 0 to 1.99).

EDGE_FW

Sets the edge sensitivity for the first wave. With a

negative offset it is reasonable to trigger on the

falling edge of the first wave.

0 = rising edge, 1 = falling edge

EN_AUTOCALC_MB2

1 = switch on the automatic calculation of all enabled

hits. The sum of the results is written to read

measurement result 4 at read register address 3

(=RES_3).

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