TDC-GP30 datasheet(21/89 Pages) AMSCO

21 / 89 page

Ultrasonic Flow Converter

Vol. 1

TDC-GP30

3-12

www.acam.de

DB_GP30Y_Vol1_en.docx V0.0

3.1.1

Measurement Sequence

The GP30 measure rate generator and task sequencer fully control the entire measurement

sequence. The GP30 can be the master in the system which triggers the measurements

autonomously, does the data processing and wakes up an external microcontroller if necessary ( flow

meter mode, self-controlled). Alternatively, the GP30 can act as a pure converter that controls the

measurement but without any data processing (time conversion mode, self-controlled). For

debugging, individual tasks can also be triggered remotely by an external microcontroller.

Table 3-1 Operating modes

Operating Mode

Measure Rate

Generation

Application Setup

Post Processing

Flow meter mode (self-controlled)

by GP30

Time conversion mode (self-

controlled)

per Remote

Time conversion mode (remote

controlled)

per Remote

only for test or debug purpose

The various functional blocks of the TDC-GP30 are controlled by hard-wired control registers and

system handling registers in the random access memory (RAA). For self -controlled applications

those can be stored in the firmware data section FWD2 of the RAA. From there the data is copied

into the direct mapped registers during a boot sequence. The various configuration registers and

system handling registers are described in detail in section 7. The variable names are formatted in

bold in this document for better reading.

In low power mode, the GP30 generally needs a 32.768 kHz oscillator to act as a continuously

running clock (LSO). For time measurement the GP30 typically uses a 4 MHz ceramic oscillator

which is activated only for the short period of the measurement. In the same manner, the comparator

and other analog elements are powered only for the short period of the measurement.

The low-frequency clock LSO is used as



Base for the task sequencer cycle



Base for the pulse interface



Base for the time stamp



Base for an initial UART baud rate of 4.800 baud

The tasks themselves can be grouped as follows:

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