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GP2000
GC-IP2000 Evaluationboard
Manual
Version: 1.0
Date: 29.05.2009
GEMAC – Gesellschaft für Mikroelektronikanwendung Chemnitz mbH
Zwickauer Strasse 227 · 09116 Chemnitz · Germany
Telephone: +49 371 3377 – 0 · Telefax: +49 371 3377 – 272
E-mail: [email protected] · Web: www.gemac-chemnitz.de
GEMAC GC-IP2000 Evaluation board
Revision Overview
Revision Overview
Date
29.05.09
Revision
1.0
First version
Change(s)
© Copyright 2009 GEMAC
Subject to change without prior notice.
Our policy is one of continuous improvement, and consequently the equipment may vary slightly from the
description and specifications in this publication. The specifications, illustrations and descriptions provided in
this documentation are not binding in detail. No part of this publication may be reproduced in any form, or by
any means, without the prior written permission of GEMAC – Gesellschaft für Mikroelektronikanwendung
Chemnitz mbH.
All rights according to the law on copyright remain expressly reserved to GEMAC.
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GEMAC GC-IP2000 Evaluation board
Table of Contents
Table of Contents
1 Overview.......................................................................................................................................................4
2 Features........................................................................................................................................................5
3 Hardware......................................................................................................................................................6
3.1 Switches................................................................................................................................................6
3.2 LEDs......................................................................................................................................................6
3.3 Connectors............................................................................................................................................7
4 Characteristic Values...................................................................................................................................8
5 Configuration...............................................................................................................................................9
5.1 Configuration process............................................................................................................................9
5.2 Overview...............................................................................................................................................9
5.3 Configuration of sensor........................................................................................................................10
5.4 Configuration of digital interface...........................................................................................................10
5.5 Configuration of interpolation...............................................................................................................11
6 Quickstart...................................................................................................................................................12
Index of figures
Fig. 1 Block diagramm....................................................................................................................................4
Fig. 2 Component place diagramm.................................................................................................................6
Fig. 3 Configuration area at PCB-bottom........................................................................................................9
Index of tables
Table 1 Switches.............................................................................................................................................6
Table 2 LEDs..................................................................................................................................................6
Table 3 Power supply header X4....................................................................................................................7
Table 4 Sensor header X9..............................................................................................................................7
Table 5 Digital output header X11...................................................................................................................7
Table 6 SPI header X3....................................................................................................................................7
Table 7 Analog output header X10..................................................................................................................7
Table 8 Ground pins.......................................................................................................................................7
Table 9 Extension header J1 and J2...............................................................................................................8
Table 10 Characteristic values........................................................................................................................8
Table 11 Configuration possibilities.................................................................................................................9
Table 12 Configuration of the signal amplitude of GC-IP2000 .....................................................................10
Table 13 Configuration of termination resistor and reference mark input......................................................10
Table 14 Configuration of the sensor input...................................................................................................10
Table 15 Configuration of IO-Voltage............................................................................................................10
Table 16 Configuration of output Mode.........................................................................................................10
Table 17 Configuration of digital interface for typical applications.................................................................11
Table 18 Configuration of SPI hardware address..........................................................................................11
Table 19 Configuration of Clock...................................................................................................................11
Table 20 Configuration of interpolation rate..................................................................................................11
Table 21 Configuration of reference mark output.........................................................................................11
Table 22 Function of multi purpose switch S5...............................................................................................11
Table 23 Configuration of the hysteresis.......................................................................................................11
Table 24 Configuration of the minimum edge interval...................................................................................12
Table 25 Configuration default values...........................................................................................................12
Table 26 EEPROM default values.................................................................................................................12
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GEMAC GC-IP2000 Evaluation board
1 Overview
1 Overview
The evaluation board GP2000 serves to demonstrate and evaluate the functionality of
GEMAC interpolation circuit GC-IP2000. Serveral configuration options and connectors
can be used to easily adapt the GC-IP2000 to a wide range of customers applications.
It is possible to increase the resolution for incremental position and angular measuring
systems with sinusoidal output signals offset by 90°. The IC on board divides the signal
period up to 2048 times. Incremental encoders with voltage interface, encoders with
current interface, photodiode arrays as well as measuring bridges can be connected
directly. The evaluation board may operate with both single-ended and differential input
signals. The configuration of the board is possible either via EEPROM, via switches or via
serial interface.
The input signals are subjected to a GEMAC-patented internal gain and offset control. The
phase displacement of the input signals can be corrected as well. The quality of the
signals issued by the sensors is monitored in the IC GP-IP2000.
The board can be connected via RS422 to a standard interpolation counter as well as via
fast serial interface (SPI) to any microcontroller. It can be connected to 5V systems and to
3.3V systems. The propagation delay of the IC is only 5µs. A data rate of up to 500000
values per second can be reached via the SPI interface.
In addition, several build in functions of the IC GP-IC2000 like switchable analog filter,
digital hysteresis, a timer and a multistage trigger make the board an ideal choice for use
in fast controllers or control systems.
Optional
extension board via
J1 and J2
(e.g. I/U-converter)
OSC
25MHz
POR
X11: digital
Digital configuration resistors
X9: Sensor
Sensor
configuration
resistors
RS422
driver
Interpolation IC
GC-IP2000
X3: SPI
X10: analog
IC - configuration
either EEPROM
or switches
Fig. 1 Block diagramm
Detailed description of all functions can be found in the datasheet of GC-IP2000.
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GEMAC GC-IP2000 Evaluation board
2 Features
2 Features
Analog Part
analog input
- Sinusoidal / cosinusoidal / reference (index) signals; differential or single ended
- Adjustable amplification for 1 Vpp / 500 mVpp / 250 mVpp / 75 mVpp
- Input frequency max. 260 kHz for all resolutions
- Configurable resistor network to connect current encoders or photodiode arrays
- Optionally: active I/U converter to connect current encoders
Digital Part
Interpolation rate
100 / 128 / 200 / 256 / 400 / 500 / 512 / 800 / 1000 / 1024 / 1600 / 2000 / 2048
Output signals
- 30-bit counter value via serial interface (SPI)
- Up to 500000 measurement values per second
- 90° square-wave sequences (A/B/Z)
- Error signal
- Interrupt signal to the µC
- Auxiliary signals for sensor adjustment
- RS422 interface
- 5V or 3.3V interface to the µC
Signal correction
- Patented digital controller for the offset, control range ±10 % of standard amplitude
- Patented digital controller for the amplitude, control range factor 0.5 ... 1.5
- Digital potentiometer with 40 steps for phase correction; selectable range ±5° or ±10°
- LED control signal
Possibilities of configuration
Either: via configuration switches, the serial interface (SPI) or EEPROM
SPI
- Compatible to the standard SPI: 16-bit, MSB first
- SPI clock up to 25 MHz
- For configuration and measuring value output; not required for trivial systems
- 5V or 3.3V interface
Miscellaneous
Supression of disturbances
- Switchable analog noise filter
- Digital hysteresis for suppression of the edge noise at the output
Adaptation of IC to subsequent devices
- Adjustable minimum edge interval at the output
- Behaviour of IC in case of sensor error can be programmed
- Adjustable width zero signal Z of ¼ or 1 period A/B
Data logging
- 2-stage measured-value trigger
- Programmable timer
- Constant delay between sampling and measurement value of 5 µs for all resolutions
Important Characteristics
Operating voltage
5 V DC
I/O voltage, digital:
3.3 V DC or 5 V DC external or internal
Temperature range:
-40 ... 85°C
Size
PCB 80mm x 84mm
Order Information
Product Type
Description
Item No.
GP2000
Evaluation board for interpolation IC GC-IP2000
PR-44010-00
I/U-converter
I/U-converter for IPE2000 and GP2000
PR-44020-00
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GEMAC GC-IP2000 Evaluation board
3 Hardware
3 Hardware
Fig. 2 Component place diagramm
 Schematic and layout are available free of charge by e-mail to [email protected].
3.1 Switches
Table 1 Switches
Switch
Function
S1
Setting of output mode
S2
Setting of input amplitude
S3
Setting of digital hysteresis
S4
Setting of minimum edge interval tpp
S5
Setting of interpolation rate, SPI-hardware address and reference mark output
S6
Setting of interpolation rate and SPI-hardware address
Default
1 (AVSS)
1 (AVSS)
off
1 (AVSS)
1 (AVSS)
0
A detailed description of all switches can be found in chapter 9.
3.2 LEDs
Table 2 LEDs
LED
LD2
Power LED
LD1
Sensor monitor
Value
off
green
green
red
Document: PR_44010-DB-1-0-E-GP2000
Meaning
GP2000 not working
GP2000 working
Sensor signals valid
Sensor adjustment necessary
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GEMAC GC-IP2000 Evaluation board
3 Hardware
3.3 Connectors
Table 3 Power supply header X4
Pin
Name
1 DVDD
2 DVSS
Direction
Input
Input
Meaning
Board supply voltage 5V
Board supply ground
Table 4 Sensor header X9
Pin
1
2
3
4
5
6
7
8
Name
SINP
SINN
COSP
COSN
REFP
REFN
SENSVDD
AVSS
Direction
Input
Input
Input
Input
Input
Input
Output
Output
Meaning
Encoder signal sine positive
Encoder signal sine negative
Encoder signal cosine positive
Encoder signal cosine negative
Encoder signal refernce positive
Encoder signal refernce negative
Encoder power supply 5V
Encoder ground
Table 5 Digital output header X11
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
AP
AN
BP
BN
ZP
ZN
EP
EN
nTRGIN
nRESIN
CKIN
CKOUT
DVDDIO
DVDDIO
DVSS
DVSS
Direction
Output
Output
Output
Output
Output
Output
Output
Output
Input w. pullup
Input w. pullup
Input
Output
Output
Output
Output
Output
Meaning
Square wave Output A positive or GC-IP2000 output A resp. - See configuration of LJ3
Square wave Output A negative
Square wave Output B positive or GC-IP2000 output B resp. - See configuration of LJ4
Square wave Output B negative
Square wave Output Z positive or GC-IP2000 output Z resp. - See configuration of LJ5
Square wave Output Z negative
Error Output E positive or GC-IP2000 output nERR resp. - See configuration of LJ6
Error Output E negative
Trigger signal input; falling edge active
Reset signal input; low active
Clock input; See configuration of LJ2
Clock output
Digital IO supply of GC-IP2000; See configuration of LJ7
Digital IO supply of GC-IP2000; See configuration of LJ7
Digital ground
Digital ground
Table 6 SPI header X3
Pin
1
2
3
4
5
6
7
8
9
10
Name
SEN
DVSS
MOSI
DVSS
MISO
DVSS
SCK
DVSS
DVDDOUTEXT
DVDDOUTEXT
Direction
Input w. pullup
Output
Input
Output
Output
Output
Input
Output
Input
Input
Meaning
SPI enable
Digital ground
Serial data from SPI-Master to GC-IP2000
Digital ground
Serial data from GC-IP2000 to SPI-Master
Digital ground
Serial clock
Digital ground
Output IO-Power; See configuration of LJ8
Output IO-Power; See configuration of LJ8
Table 7 Analog output header X10
Pin
1
2
3
4
5
6
Name
SMON
CMON
LED
V0BUF
AVSS
AVSS
Direction
Output
Output
Output
Output
Output
Output
Meaning
analog test signal sine
analog test signal cosine
LED signal GC-IP2000
Buffered midvoltage of GC-IP2000; Maximum output current of signal V0BUF is 30mA
Analog ground
Analog ground
Table 8 Ground pins
Pin
MP1
MP2
MP3
MP4
Name
AVSS
AVSS
DVSS
DVSS
Direction
Output
Output
Output
Output
Document: PR_44010-DB-1-0-E-GP2000
Meaning
analog ground
analog ground
Digital ground
Digital ground
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GEMAC GC-IP2000 Evaluation board
3 Hardware
Table 9 Extension header J1 and J2
Pin
1
2
3
4
5
6
7
8
9
10
11
Name
AVDD
AVDD
V0BUF
COSP
COSN
SINP
SINN
REFP
REFN
AVSS
AVSS
Direction
Output
Output
Output
J1: Output; J2 Input
J1: Output; J2 Input
J1: Output; J2 Input
J1: Output; J2 Input
J1: Output; J2 Input
J1: Output; J2 Input
Output
Output
Meaning
analog supply voltage 5V (output)
analog supply voltage 5V
Buffered midvoltage of GC-IP2000; Maximum output current of signal V0BUF is 30mA
Encoder signal cosine positive
Encoder signal cosine negative
Encoder signal sine positive
Encoder signal sine negative
Encoder signal reference positive
Encoder signal reference negative
analog ground
analog ground
It is possible to use the GP2000 in conjunction with an external I/U-converter (PR-44020-00) or customer
specific electronics connected via extension header J1 and J2. All sensor signals, the midvoltage V0 and the
analog supply voltage AVDD are available. J1 serves as output of GP2000 (input of external electronics) and
J2 serves as input of GP2000 (output of external electronics). Configuration resistors R4-R15 do not have
to be placed in that case. For more information please refer to chapter 9.
4 Characteristic Values
Table 10 Characteristic values
Symbol
Characteristic value
Min.
Typ.
Max.
Unit
DVDD
Supply voltage
4.75 (4.5) 1)
5.0
5.5
V
DVDDOUTEXT
External interface voltage 2)
3.0
DVDD
V
DVDDIO
Internal interface voltage
3.3 / 5.0
V
IDD
Current consumption
90
mA
T
Operating temperature
TBD
85
°C
FOSZ
Internal clock frequency
25
MHz
FOSZEXT
External clock frequency
1
25
MHz
V(V0BUF)
Midvoltage V0BUF
2.1
2.25
2.4
V
I(V0BUF)
Output current on V0BUF
30
mA
VOH
Digital output voltage H
Depends on configuration of LJ7 and LJ8
please refer to table 15
VOL
Digital output voltage L
VIH
Digital input voltage H
VIL
Digital input voltage L
1)
The control ranges and the interpolation accuracy are limited between 4.5V and 4.75V.
2)
Not required if internal voltage is used
 Additionally, the characteristic values of the IC GC-IP2000 are valid.
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GEMAC GC-IP2000 Evaluation board
5 Configuration
5 Configuration
5.1 Configuration process
After resetting of the IC GC-IP2000, all registers of the IC are initialised with their default values. Thereafter,
the configuration switches are read into the appropriate registers. If resistor R48 is placed and the
EEPROM contains the value 0x99 at address location 0x00, the configuration registers are subsequently overwritten with the EEPROM values. During the whole RESET sequence, the pin MISO/nWAIT
is maintained at L level. Subsequently, the configuration registers can be modified by way of the serial interface SPI.
5.2 Overview
Table 11 Configuration possibilities
Parameters
Possible values
Interpolation rate
2048,2000,1600,1024,1000,800
512,500,400,256,200,128,100
Minimum edge interval tpp
1.5, 3, 6, 12, 24, 48, 96, 192
Reference point
Enable, Disable / 1 period, 1 increment
Nominal signal amplitude
1Vpp, 500mVpp, 250mV pp, 75mVpp 2)
Digital hysteresis
Enable, disable
Output signals A/B/Z (behaviour) ABZ mode, DSP mode, sensor adjustment
Error processing
Masking, latch enable, LED pin
Phase correction
± 10° step width 0.5°, ±5° step width 0.25°
Low-pass filter
Enable, disable
Gain controller
Default setting / time constant / enable, disable
Offset controller
Default setting / time constant / enable, disable
Trigger
Trigger pulse edge, measurement timer
Hardware
EEPROM configuration
configuration
GC-IP2000 register / bit
CFG1 / IR(3:0)
S5 1), S6 1)
S4 1)
S5 1)
S2 1), R4-R15
S3 1)
S1 1)
-
SPI mode
Synchronous, asynchronous
SPI hardware address
0-15
S5 1), S6 1)
Input characteristic
Voltage / current
R4-R14
EEPROM
Disable / enable by EEPROM-ID
R48
Sensor terminating resistor
Any resistor value, e.g. 120Ω
R38 - R40
Reference mark
From scale / force L / force H
LJ1
Clock
Internal / external
LJ2
Output signals A/B/Z (electrical) RS422, (LV)TTL
LJ3 - LJ6
DVDDIO internal
3.3V / 5V
LJ7
Interface voltage digital
DVDDIO / external
LJ8
1)
If EEPROM is invalid or R48 is not placed
2)
Any amplitudes (current or voltage) can be selected by changing resistors R4 – R15
CFG1 / TPP(2:0)
CFG1 / DISZ, Z4
CFG1 / GAIN(1:0)
CFG1 / DHE
CFG1 / MODE (1:0)
CFG1 / Mx, Lx, LEDMODE
CFG2 / PHBER, PH(5:0)
CFG1 / LPF
CNTRLG, CFG2 / GAINCTL, DISCTL
CNTRLO, CFG2 / OFFSCTL, DISCTL
CFG1 / TRGSLP, CFG2 /
VT(1:0),T(7:0)
CFG2 / ASYNC, SYNC(4:0)
CMD / SETHWA
-
Fig. 3 Configuration area at PCB-bottom
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GEMAC GC-IP2000 Evaluation board
5 Configuration
5.3 Configuration of sensor
Table 12 Configuration of the signal
Input signals
1 Vpp (default)
500 mVpp
250 mVpp
75 mVpp
amplitude of GC-IP2000
Switch S2
1 (AVSS)
3 (AVDD)
0 (V0)
2 (open)

If resistor R48 is placed and the EEPROM contains the value 0x99 at address location 0x00, configuration of switch S2 is overwritten with the EEPROM value.
Table 13 Configuration of termination resistor and reference mark input
Sensor termination
Termination resistor
R38, R39, R40
No termination required
Current sensor
120Ω termination required
Not placed
Not placed
120Ω each
Reference mark provided by sensor
Reference simulated as active
Reference simulated as inactive
Table 14 Configuration of the sensor input
Sensor
Switch S2
1Vpp differential (default)
1Vpp single ended
500mV pp differential
500mV pp single ended
250mV pp differential
250mV pp single ended
75mVpp differential
75mVpp single ended
2Vpp differential
2Vpp single ended
11µApp current
0.5µApp current
Any voltage, Vin > Vnom
Any current, IU-converter not used
Any current, IU-converter used
1 (AVSS)
1 (AVSS)
3 (AVDD)
3 (AVDD)
0 (V0)
0 (V0)
2 (open)
2 (open)
1 (AVSS)
1 (AVSS)
3 (AVDD)
0 (V0)
See table 12
See table 12
1 (AVSS)
Reference mark generation
Input-R Sig-P
R5, R9, R13
Input-R Sig-N
R7, R11, R15
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
10k
10k
0Ω
0Ω
10K · (Vin/Vnom - 1)
0Ω
Not placed
0Ω
Not placed
0Ω
Not placed
0Ω
Not placed
0Ω
Not placed
10k
Not placed
0Ω
0Ω
10K · (Vin/Vnom - 1)
0Ω
Not placed
V0-R Sig-P
R4, R8, R12
Not placed
Not placed
Not placed
Not placed
Not placed
Not placed
Not placed
Not placed
10K
10K
24K
250k
10k
R = Vnom / (2·Inom).
Not placed
LJ1
LJ1BD 0Ω placed
LJ1AB 0Ω placed
LJ1BC 0Ω placed
V0-R SigN
R6, R10, R14
Not placed
0Ω
Not placed
0Ω
Not placed
0Ω
Not placed
0Ω
10k
0Ω
24K
250k
10k
R = Vnom / (2·Inom).
Not placed

If resistor R48 is placed and the EEPROM contains the value 0x99 at adress location 0x00, configuration of switch S2 is overwritten with the EEPROM value.
5.4 Configuration of digital interface
Table 15 Configuration of IO-Voltage
LJ7
LJ8
DVDDIO
GC-IP2000
H-level Output 1)
H-Level Input
SPI
CKIN
nRESIN
nTRGIN
LJ7AB 0Ω placed LJ8AB 0Ω placed
DVDD = 5V
DVDDOUTEXT 2)
2.0-DVDD
2.0-3.3V 3)
3.5-5V 4)
LJ7AB 0Ω placed LJ8BC 0Ω placed
DVDD = 5V
3.8V – 5.0V
2.0-DVDD
3.5V-DVDD
LJ7BC 0Ω placed LJ8AB 0Ω placed
3.3V
DVDDOUTEXT 2)
2.0-3.3V
2.0-3.3V 3)
3.5-5V 4)
LJ7BC 0Ω placed LJ8BC 0Ω placed
3.3V
2.4V – 3.3V
2.0-3.3V
2.0V-3.3V
1)
Signals CKOUT, MISO as well as signals A, B, Z and nERR if LJ3-LJ6 configured in µC Mode
2)
DVDD_OUTEXT provided external via X3/9
3)
for DVDDOUTEXT = 3.3V
4)
for DVDDOUTEXT = 5V
RS422
possible
yes
yes
no
no
 Configuration of LJ7 and LJ8 for typical applications is shown in table 17.
Table 16 Configuration of output Mode
Mode
Switch S1
ABZ square-wave
1 (AVSS)
Controller / DSP
3 (AVDD)
Sensor adjustment 1
0 (V0)
Sensor adjustment 2
2 (open)
LJ3-LJ6
Resistor AB 0Ω placed
Resistor BC 0Ω placed
any
any

If resistor R48 is placed and the EEPROM contains the value 0x99 at adress location 0x00, configuration of switch S1 is overwritten with the EEPROM value.
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GEMAC GC-IP2000 Evaluation board
5 Configuration
Table 17 Configuration of digital interface for typical applications
Applikation
LJ7
LJ8
S1
LJ3-LJ6
DVDDOUTEXT 1)
RS422 and digital interface 3.3V LJ7AB 0Ω placed LJ8AB 0Ω placed 1 (AVSS) Resistor AB 0Ω placed 3.3V
RS422 and digital interface 5V
LJ7AB 0Ω placed LJ8BC 0Ω placed 1 (AVSS) Resistor AB 0Ω placed
Not necessary
Full µC interface 3.3V
LJ7BC 0Ω placed LJ8BC 0Ω placed 3 (AVDD) Resistor BC 0Ω placed Not necessary
2)
DVDDOUTEXT provided external via X3/9
Table 18 Configuration of SPI hardware address
SPI adress
Switch S5
Switch S6
Single channel
any
any
0
1 (AVSS) or 0 (V0) 0
1
1 (AVSS) or 0 (V0) 1
2
1 (AVSS) or 0 (V0) 2
3
1 (AVSS) or 0 (V0) 3
4
1 (AVSS) or 0 (V0) 4
5
1 (AVSS) or 0 (V0) 5
6
1 (AVSS) or 0 (V0) 6
7
1 (AVSS) or 0 (V0) 7
SPI address
8
9
10
11
12
13
14
15
Switch S5
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
3 (AVDD) or 2 (open)
Switch S6
0
1
2
3
4
5
6
7

To activate multichannel SPI it is necessary to send the SPI-Brodacast-command SETHWA. Please refer to the data sheet of GCIP2000. In multichannel mode IC4 and R25 must not be placed at more than one GP2000.
Table 19 Configuration of Clock
Clock signal
Internal 25MHz
External via X11/11
LJ2
Resistor AB 0Ω placed
Resistor BC 0Ω placed
5.5 Configuration of interpolation
Table 20 Configuration of interpolation rate
Interpolation rate
Switch S5
2000
1 (AVSS) or 0 (V0) 0
1600
1 (AVSS) or 0 (V0) 1
1000
1 (AVSS) or 0 (V0) 2
800
1 (AVSS) or 0 (V0) 3
500
1 (AVSS) or 0 (V0) 4
400
1 (AVSS) or 0 (V0) 5
200
1 (AVSS) or 0 (V0) 6
100
1 (AVSS) or 0 (V0) 7
Switch S6
Interpolation rate
Switch S5
2048
3 (AVDD) or 2 (open) 0
1024
3 (AVDD) or 2 (open) 1
512
3 (AVDD) or 2 (open) 2
256
3 (AVDD) or 2 (open) 3
128
3 (AVDD) or 2 (open) 4
1000
3 (AVDD) or 2 (open) 5
1000
3 (AVDD) or 2 (open) 6
1000
3 (AVDD) or 2 (open) 7
Switch S6

If resistor R48 is placed and the EEPROM contains the value 0x99 at address location 0x00, this configuration is overwritten with
the EEPROM value.
Table 21 Configuration of reference mark output
Reference mark width
Switch S5
1 increment = ¼ period
1 (AVSS) or 3 (AVDD)
4 increments = 1 period
0 (V0) or 2 (open)
Disable
Not configurable via S5
Table 22 Function of multi purpose switch S5
Switch S5
Interpolation rate
decimal
1 (AVSS)
3 (AVDD)
binary
0 (V0)
decimal
2 (open)
binary
EEPROM-Adress 0x0C Bit 5
0 (or EEPROM invalid or R48 not placed)
0 (or EEPROM invalid or R48 not placed)
1 (EEPROM must be valid and R48 is placed)
Reference mark width
1 increment = ¼ period
1 increment = ¼ period
4 increments = 1 period
4 increments = 1 period
SPI hardware address
<8
≥8
<8
≥8
Table 23 Configuration of the hysteresis
Digital hysteresis
Switch S3
deactivated
ON
activated
OFF

If resistor R48 is placed and the EEPROM contains the value 0x99 at address location 0x00, this configuration is overwritten with
the EEPROM value.
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GEMAC GC-IP2000 Evaluation board
5 Configuration
Table 24 Configuration of the minimum edge interval
Min. edge interval tpp
Switch S4
EEPROM-address 0x0D Bits 2:0
1/fOSZ
1 (AVSS)
000 (or EEPROM invalid or R48 not placed)
2/fOSZ
3 (AVDD)
001 (or EEPROM invalid or R48 not placed)
4/fOSZ
0 (V0)
010 (or EEPROM invalid or R48 not placed)
8/fOSZ
2 (open)
011 (or EEPROM invalid or R48 not placed)
16/f OSZ
Not configurable via S4 100 (EEPROM must be valid and R48 is placed)
32/f OSZ
Not configurable via S4 101 (EEPROM must be valid and R48 is placed)
64/f OSZ
Not configurable via S4 110 (EEPROM must be valid and R48 is placed)
128/fOSZ
Not configurable via S4 111 (EEPROM must be valid and R48 is placed)

If resistor R48 is placed and the EEPROM contains the value 0x99 at address location 0x00, this configuration is overwritten with
the EEPROM value.
6 Quickstart
To set the board into operation, a voltage of 5V must be connected to power header X4. The evaluation
board GP2000 will be delivered with default configuration in its EEPROM and its configuration jumpers. Encoders with an amplitude of 1Vpp can be connected directly. RS422 signals as well as SPI signals are available.
SPI may work with 5V or 3.3V voltage. Appropriate voltage has to be provide at connector X3, at pins 9 and
10.
To check the input signals the monitor signals SMON and CMON can be used. Default amplitude at this signals
is 2.1Vpp.
Table 25 Configuration default values
Ressource
Value
R48
Resistor 0Ω placed
R38, R39, R40
Resistor 120Ω not placed
R5, R7, R9, R11, R13, R15 Resistor 0Ω placed
R4, R6,R8,R10,R12, R14 Resistor 0Ω not placed
LJ1
Resistor LJ1BD 0Ω placed
LJ2
Resistor LJ1AB 0Ω placed
LJ3-LJ6
Resistor LJxAB 0Ω placed
LJ7
Resistor LJ7AB 0Ω placed
LJ8
Resistor LJ8AB 0Ω placed
S1
1 (AVSS)
S2
1 (AVSS)
S3
off
S4
1 (AVSS)
S5
1 (AVSS)
S6
0
Meaning
EEPROM configuration will be used
High impedance termination for all encoder signals
Direct differential input all encoder signals
Direct differential input all encoder signals
Reference mark signal of encoder will be used
Clock signal 25MHz (internal) will be used.
RS422 interface will be provided at digital output header X11
DVDDIO voltage of GCIP2000 is 5V; RS422 interface is available
SPI driver voltage will be provided external from X3/9
not used if EEPROM valid, output mode RS422 otherwise
not used if EEPROM valid, nominal amplitude of 1Vpp otherwise
not used if EEPROM valid, digital hysteresis enabled otherwise
not used if EEPROM valid, edge interval tpp of 40ns otherwise
not used if EEPROM valid, reference mark witdh of 1 increment otherwise
not used if EEPROM valid, interpolation rate of 2000 otherwise
Table 26 EEPROM default values
Resource
Usage
analog input
Nominal amplitude 1Vpp
ABZ
Active, ABZ-Output, 1 increment with output pulse Z
Interpolation rate
2000
Min. edge interval tpp
1/fOSZ
Sensor monitoring
Square wave mode, latching disabled, LED default mode
Timer / Trigger / SPI
Standard, Timer off
Automatic Controller
Active, standard
Filter, Hysteresis
Active
EEPROM
0x1D 0x1C 0x1B 0x1A 0x19 0x18 0x17 0x16 0x15 0x14 0x13 0x12 0x11 0x10 0x0F 0x0E 0x0D 0x0C ... 0x00
ADR
0x00 0x00 0x00 0x00 0x00 0x00 0x04 0x00 0x04 0x00 0x00 0x00 0x10 0x00 0x40 0x3F 0x10 0x00 - 0x99
DAT
 A detailed description of all values can be found in the datasheet of GC-IP2000.
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