AM-IP4k
54Pages

AM-IP4k Datasheet Version: Date: AMAC ASIC- Mikrosensoranwendung Chemnitz GmbH Kopernikusstr. 16 D-09117 Chemnitz Germany

Revision History Date First Version At 2 Features Analogue input range 220 kHZ Figure 1 Block diagram ink word changed to inc. Figure 2 Functional block diagram ink word changed to inc. Overview. Switching analogue filter deleted and modified to low-pass. Figure 4 Input signals (single-ended) update. U to V. Figure 5 Input signals differential update. U to V. Figure 11 Reference signal MVAL(ZMODE) updated to CFG3/ZMODE 01 Figure 21 Mnimum circuit of the AM-IP4K added Table 1: Pin assignment AM-IP4k QFN56 Pin assignment, revised Instrument amplifier changed to instrumentation amplifiers...

1 Overview The interpolation circuit AM-IP4k serves to increase the resolution of incremental position and angular measuring systems with sinusoidal output signals offset by 90°. The input signals are subjected to an AMACspecific internal gain and offset control, which automatically leads to a correction of amplitude and zero position. Additionally correction of concentricity errors as well as signal form errors are integrated. Furthermore the phase deviation of the input signals can be corrected statically via a digital potentiometer. By dividing the signal period up to 4096 times a...

2 Features Interfaces Analogue input - Sine- / Cosine- / Reference signal: differential or single-ended - Nominal amplitude configurable to 1 Vpp / 500 mVpp / 250 mVpp / 75 mVpp - Maximum input frequency up to 220 kHz - 90° square wave sequences (A/B/Z) - Adjustable width of the index signal Z of ¼ or 1 period A/B - Error signal - Interrupt signal for µC - Additional signals for sensor adjustment - 30 bit count value / 16 bit multi-turn value - Data rate up to 500,000 measured values/s - 9 bit signal monitoring - Compatible with standard SPI: 16 bit, MSB first, up to 25 MHz - Signal filter...

Application overview 4 Application overview Signal form (Sensor) Sinusoidal, voltage Direct connection of AM-IP4k to sensor Sinusoidal, current Additional resistors required Reference (index) track Direct connection of AM-IP4k to sensor Square wave Signal specification (sensor) Direct connection of AM-IP4k to sensor Direct connection of AM-IP4k to sensor Direct connection of AM-IP4k to sensor Direct connection of AM-IP4k to sensor Additional resistors required Differential signal, DC reference voltage Direct connection of AM-IP4k to sensor Single-ended, DC reference source inside sensor...

Name SINP SINN COSP COSN REFP REFN V5V VSS VDD CLK_CLKSEL TM2 TM TST_0B TST_0A MOSI_SLI SEN SCK_MA NSS MISO_SLO NERR VSSO VDDO A B Z HWA3 1) HWA2 1) HWA1 1) HWA0 1) TRG ZERO TEACH NRES VDD VSS LDP LDN OPO OPI VDDA VSSA SMON CMON V1P1 VRH ADIN ADIP VRM VRL VDDA VSSA TSTP TSTP2 TSTP1 EXPOSED Function Quadrature signal 1 – Sine positive Quadrature signal 1 – Sine negative Quadrature signal 2 – Cosine positive Quadrature signal 2 – Cosine negative Reference signal positive Reference signal negative Supply voltage analogue (Mean voltage single-ended) Digital GND Supply voltage digital Clock...

Figure 3: AM-IP4k QFN56 Package Dimensions © 2020 AMAC ASIC- und Mikrosensoranwendung Chemnitz GmbH Date: 05/02/2020 Subject to change without notice · Any kind of duplication, reprocessing and translation of this document as well as excerpts from it require the written permission of AMAC ASIC- und Mikrosensoranwendung Chemnitz GmbH.

Startup behaviour / Configuration options 6 Startup behaviour / Configuration options 6.1 Reset After the IC’s reset the digital interface will be selected (SPI or SSI) and all registers will be initialised with their default values. In case a valid identifier was programmed at EEPROM address 0x00, the configuration values are read in from the internal EEPROM. During the whole reset sequence one of the outputs MISO or NERR is maintained at L-level depending on the selected interface. Until this point the serial interfaces must not be activated. After completed initialisation the IC’s...

Startup behaviour / Configuration options Possible values Phase correction ± 10° Step size 0.3125°, ±5° Step size 0.15625° Gain controller Default setting / time constant / enable, disable CNTRLG, CFG2 / GAINCTL, DISCTL Offset controller Default setting / time constant / enable, disable CNTRLO, CFG2 / OFFSCTL, DISCTL Hardware address Special functions Trigger edge Teach active / inactive Measuring timer Counter zero position (preset) CFG2 / TRGSLP CFG2 / TEAEN CFG3 / VT(1:0),T(7:0) PRE_ST, PRE_MT Interface configuration Data format of position values CFGSSI / SSI20, MTBIT (1:0), GRAY, STBIT...

Functional description 7 Functional description 7.1 Input amplifier / Low-pass filter The AM-IP4k contains three instrumentation amplifiers with adjustable gain factors. Incremental encoders with a voltage interface and measuring bridges can be connected directly. Sensors with current interface are adapted by a simple external circuit (see chapter 11.1). The IC is able to operate with both single-ended and differential input signals. There is an identical amplification of all sensor signals (sine, cosine, reference). The mean voltage of the instrumentation amplifier at pin V1P1 can be used...

Functional description Vinput VDIFF= SINP-SINN Headroom to control amplitude+offset Headroom to control amplitude+offset Figure 5: Input signals (differential) The input voltage of the instrumentation amplifiers is limited within a range of Vinput= 0.65 V to VDDA-0.45 V. Depending on the common-mode voltage at the analogue input, this may limit the operating range of the GAIN setting “00” (VNOM = 1000 mVpp), gain factor. Fehler: Referenz nicht gefunden Figure 6: CMIR (Input signals) The following table shows some combinations of common-mode voltage and supply voltage for single-ended...

Functional description 7.2.2 Phase Adjustment The phase deviation of the input signal can be corrected statically or tuned via a 64 step digital potentiometer. For a static phase adjustment the register bits CFG2/PHBER and CFG2/PH should be set accordingly. By configuring bit CFG2/PHBER two possible setting ranges can be selected4: • • ±5° Step size 0.15625° ± 10° Step size 0.3125° In register bits CFG2/PH the calculated correction value (in signed format), from the following formula should be entered4: If the automatic phase correction (phase controller) is used, then the configuration bit...