IC-MQ_15 Datasheet, PDF (25/43 Pages) IC-Haus GmbH – Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
SIGNAL LEVEL CONTROL and SIGNAL MONITORING
Rev F3, Page 25/43
Via the controlled sensor current source (pin ACO)
iC-MQ can keep the input signals for the internal sine-
to-digital converter constant regardless of temperature
and aging effects by tracking the sensor supply.
Both the controller operating range and input signal
amplitude for the controller are monitored and can be
enabled for error messaging. A constant current source
can be selected for the ACO output when setting the
signal conditioning; the current range for the highside
current source is adjusted using ADJ(6:5).
ADJ (6:5)
Code
00
01
10
11
Addr 0x10, bit 5:4
Function
5 mA - Range
10 mA - Range
25 mA - Range
50 mA - Range
Table 36: ACO Output Current Range (applies for con-
trol modes and constant current source)
ADJ (8:7)
Code
00
01
10
11
Addr 0x10, bit 7:6
Function
Sine/cosine square control
Sum control
Constant current source
Not permitted (device test only)
Table 37: ACO Output Control Mode
Note: Excessive input signals or internal signal clipping
can interfere control operation, so that the preset operating
point may not be reached (upon power up) or maintained
(upon disturbances). Use Control Error 2 and Signal Error 1
for monitoring and configure EMASKA accordingly.
ADJ (4:0)
Code
0x00
0x01
...
0x19
...
0x1F
Addr 0x10, bit 3:0; Addr 0x0F, bit 7
Square control ADJ(8:7) = 00
Vpp() ca. 300 mV (60 %)
Vpp() ca. 305 mV (61 %)
...
≈
300
mV
77
77−(1.25∗Code)
Vpp() ca. 500 mV (98 %)
...
Vpp() ca. 600 mV (120 %)
Table 38: Setpoint Square Control (internal sin/cos sig-
nal amplitude)
In operation with the active square control mode
ADJ(4:0) sets the internal signal amplitudes accord-
ing to the relation (PCH1-NCH1)² + (PCH2-NCH2)²;
these should be set to 0.25 Vpk.
Figure 8: Internal signal monitoring and test sig-
nals in Calibration 2 mode (example for
ADJ(8:0) = 0x19).
Signal monitoring and limits
ADJ (4:0) Vt()min ... max ADJ (4:0) Vt()min ... max
0x00
120 mV...390 mV 0x19
200 mV ...650 mV
0x01
122 mV...397 mV ...
...
...
...
0x1F
240 mV...780 mV
Note
All values nominal, see also Elec. Char. Nos. 605,
606
Table 39: Signal Monitoring
The signal monitoring limits are tracked according to
ADJ (4:0) and fit for square control mode. When using
sum control mode a different operating point can be
required for which the monitoring limits may not be suit-
able. In this case signal monitoring should be disabled
via the error mask (see EMASKA etc.).
ADJ (4:0)
Code
0x00
0x01
...
0x1F
Addr 0x10, bit 3:0; Addr 0x0F, bit 7
Sum control ADJ(8:7) = 01
VDC1 + VDC2 ca. 245 mV
VDC1 + VDC2 ca. 249 mV
...
≈
245mV
77
77−(1.25∗Code)
VDC1 + VDC2 ca. 490 mV
Table 40: Setpoint Sum Control (DC value)
ADJ (4:0)
Code
0x00
0x01
...
0x1F
Note
Addr 0x10, bit 3:0; Addr 0x0F, bit 7
Constant current source ADJ(8:7) = 10
I(ACO) ca. 3.125% Isc(ACO)
I(ACO) ca. 6.25% Isc(ACO)
... ≈ 3.125% ∗ (Code + 1) ∗ Isc(ACO)
I(ACO) ca. 100% Isc(ACO)
See Elec. Char. No. 602 for Isc(ACO)
Table 41: Setpoint Current Source (ACO output cur-
rent)