IC-MQ_15 Datasheet, PDF (18/43 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev F3, Page 18/43
Calibration 1, 2, 3
These modes are used to condition the input signals
and calibrate iC-MQ. In mode Calibration 1 the user can
measure the IBN bias current and the zero channel ana-
log signals are available following signal conditioning
(PCH0 and NCH0).
In mode Calibration 2 the conditioned sine and cosine
signals are output (PCH1, NCH1, PCH2 and NCH2).
In addition intermediate potential VDC1 is provided for
compensating circuit CH1, as is intermediate poten-
tial VDC2 for CH2 (for a description of the calibration
process, see page 22).
In mode Calibration 3 the internal temperature mon-
itoring signals are provided. Calibration of the bias
current source and temperature monitoring is described
on page 16 and calibration of the zero channel on page
24.
TEST 6
The input voltages at pins X3 to X6 can be checked in
mode Test 6. The following settings are required here:
• GF1 = 0x0
• GF2 = 0x0
• TOP2(3) = ’1’
System Test Mode and Digital Calibration
This mode enables the signal conditioning to be ad-
justed using comparated sine and cosine signals. To
this end at a resolution of 8 the interpolator generates
a switchpoint every 45 degrees. The objective of the
calibration procedure is a pulse duty cycle of exactly
50% respectively for A₄, B₄ und A₈, B₈.
System Test
Pin Signal
Description
PA A₄
NA A₈
Offset CH1
Phase deviation from 90° between
CH1 and CH2
PB B₄
NB B₈
Offset CH2
Amplitude deviation between
CH1 and CH2
PZ Z_In
NZ TP1
Digital zero signal, unmasked
Verification of line count (pulses) between two
zero pulses
Low signal: verification running (state after
power on reset)
High signal: verification finished
An error messaging at ERR is valid after the
second zero signal (enable required).
ERR ERR
Error signal
The following settings are required for mode System Test:
MODE = 0x0B, SELRES = 0x1B0, SELHYS = 0xF, CFGABZ(7:4) =
’0000’
Table 15: Digital Calibration Signals
• TOP2(4) = ’0’