iC-MG
preliminar y
Rev C1, Page 2/20
8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
DESCRIPTION
Interpolator iC-MG is a non-linear A/D converter
which, by applying a count-safe vector principle, digi-
tizes sine/cosine sensor signals with selectable reso-
lution and hysteresis. The angle value is output incre-
mentally via differential RS422 drivers as an encoder
quadrature signal with an index pulse. The minimum
phase distance can be preselected, thus generating
fail-safe counter signals and enhancing the noise im-
munity of the sensor system.
Programmable instrumentation amplifiers with se-
lectable gain levels permit differential (in VDIFF or
IDIFF mode) or single-ended input signals (in VREF
or IREF mode). The modes of operation differen-
tiate between high impedance (V modes) and low
impedance (I modes). This adaptation of the iC to
voltage or current signals enables MR sensor bridges
or photosensors to be directly connected up to the
device.
The integrated signal conditioning unit allows signal
amplitudes and offset voltages to be calibrated and
also any phase error between the sine and cosine
signals to be corrected.
For the purpose of signal stabilization (to minimize
the effects of temperature and aging), the condi-
tioned signals are fed into the power supply controller
which drives the transmitting LED of optical systems
via the integrated 40 mA driver stage (output PWR).
If MR sensors are connected this driver stage also
powers the measuring bridges. If the control thresh-
olds are reached this is signaled at alarm message
output NERR (signal loss due to wire breakage, short
circuiting, dirt or aging, for example).
iC-MG is protected against a reversed power supply
voltage; the integrated supply switch for loads of up
to 20 mA extends this protection to cover the over-
all system. The device is configured via an external
EEPROM.
PACKAGES
PIN CONFIGURATION TSSOP20
PIN FUNCTIONS
No. Name Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
PZERO
NZERO
NSIN
PSIN
VDDS
GNDS
PCOS
NCOS
PWR
SDA
SCL
NB
B
NA
A
GND
VDD
NZ
Z
NERR
Input Zero Signal +
Input Zero Signal -
Input Sine Signal -
Input Sine Signal +
Subsystem Positive Supply Output
Subsystem Ground Output
Input Cosine Signal +
Input Cosine Signal -
Controlled Power Supply Output (High-
Side)
Serial E2PROM Interface, data line
Serial E2PROM Interface, clock line
Incremental Output B-
Incremental Output B+
Incremental Output A-
Incremental Output A+
Ground
+4.3 ... 5.5 V Supply Voltage
Incremental Index Output Z-
Incremental Index Output Z+
Alarm Message and Test Signal Output
(e.g. index enable signal Zin)
ICHAUS [ IC-HAUS GMBH ]
