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6
Technical information
6.1 Interface circuits
6.1.1
Sensor data input port
The sensor data input port schematic is shown in Figure 31.
TxD
DE
To UART
RX
RxD
RE
Figure 31 Input port schematic
A logical low input is defined as: A-B < -0.2V.
A logical high input is defined as: A-B > +0.2V.
6.1.2
Bi-directional data ports
The input circuitry of the bi-directional data ports is identical to the input
circuitry for the sensor data input ports described in the preceding section. The
output circuitry consists of a differential line driver IC (Analog Devices
ADM2587E) and is shown in Figure 32.
Vcc
DC to DC Converter
Oscillator
Digital isolation
Encode
Encode
Encode
GND 1
Isolation Barrier
Technical information
V ISOOUT
Rectifier
Regulator
Transceiver
Decode
Decode
Decode
ADM2587E
GND 2
V ISOIN
Y
Z
Data input port
RX_A
A
B
RX_B
RX_COM
Page 83
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