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TDC-GP30 in gas meters
1 Introduction
TDC-GP30Y is an ultrasonic flow converter (UFC) mainly for ultrasonic heat and water meters.
However, the TDC-GP30 can cooperate with external analog switches and an amplifier for
operation in other ultrasonic applications like clamp-on or gas flow meters. In this so-called gas
meter mode the chip uses the available GPIO pins to drive external analog switches with higher
voltages. An external amplifier in the receive path can be added, too. In the following we describe
such an external circuit in combination with the GP30-EVA-KIT.
1.1 Setup
The figure below shows the general setup of the system.
Figure 1: General Setup
USB
PC
PICOPROG
V3.0
GP30-EVA-MODULE
GP30-Gas meter
test board
Gas spool piece and
transducers
The gray colored unit is the external test board GP30Y – Gasmeter V1.1 which drives the ultrasonic
transducers for gas flow measuring applications. PicoProg and GP30-EVA-MODULE are the
standard products of ams.
1.2 The Parts of the System
The following table shows the parts required for the system.
Figure 2: Elements of the test setup
A) GP30Y Evaluation Board