IC-PI datasheet(45/49 Pages) ICHAUS

45 / 49 page

preliminary

iC-PI PROGRAMMABLE 12-BIT

Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

Rev B1, Page 45/48

APPLICATION NOTES: CIRCUIT EXAMPLES

Figure 36 is a circuit diagram of an optical encoder with

incremental quadrature outputs as RS422-compatible

differential signals which should be terminated by 100 Ω

resistors at the controller end. Alternatively, a mag-

netic encoder using magnetoresistive sensor bridges is

shown in Figure 37. Overvoltage protection is realized

using TVS diodes and a PolyFuse in the VDD line, as

shown.

Figure 36: Optical encoder application example.

Figure 37: Magnetic encoder application example.

When iC-PI is used in 24 V systems with supply volt-

ages of 5 V to 30 V for example, it can be combined

with iC-DL which is a line driver with integrated line

adaptation (Figure 38).

Reduced driving capability of iC-PI is sufficient

(SIK = 00) to operate iC-DL, so current from the 5 V

supply is reduced. If an LDO voltage regulator is se-

lected, the circuit is suitable for a supply range of 4.5 V

to 30 V without any change.

The wiring of the iC-DL error message output (pin NER)

to the PLC is not necessary if the iC-PI error mask is

set for output shutdown (EMASKO). In the event of an

error, the pull-down current sources ensure that a low

signal is produced at the iC-DL inputs on all lines. The

IC-PI Datasheet(PDF) 45 Page - IC-Haus GmbH