iC-MQ PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 25/39
SIGNAL LEVEL CONTROL and SIGNAL MONITORING
ADJ (4:0)
Code
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Square control ADJ(8:7) = 00
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.
0x00
Vpp() ca. 300 mV (60 %)
Vpp() ca. 305 mV (61 %)
0x01
77
...
Vpp() ≈ 300 mV 77−(1.25∗Code)
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 set-
ting the signal conditioning; the current range for the
highside current source is adjusted using ADJ(6:5).
0x19
...
Vpp() ca. 500 mV (98 %)
...
0x1F
Vpp() ca. 600 mV (120 %)
Table 40: Internal Sin/Cos Signal Amplitude For
Square Control
In operation with the active square control mode
ADJ(4:0) sets the internal signal amplitudes according
to the relation (PCH1-NCH1)² + (PCH2-NCH2)²; these
should be set to 0.25 Vpk.
ADJ (4:0)
Code
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Sum control ADJ(8:7) = 01
VDC1 + VDC2 ca. 245 mV
VDC1 + VDC2 ca. 249 mV
0x00
0x01
77
...
VDC1 + VDC2 ≈ 245mV 77−(1.25∗Code)
Figure 5: Internal signal level monitoring and test
signals in Calibration 2 mode (example
for ADJ(8:0) = 0x19; see Elec. Char.
Nos. 605 and 606 regarding Vt()min and
Vt()max).
0x1F
VDC1 + VDC2 ca. 490 mV
Table 41: DC Setpoint For Sum Control
ADJ (4:0)
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Constant current source ADJ(8:7) = 10
I(ACO) ca. 3.125% Isc(ACO)
Code
0x00
0x01
ADJ (8:7)
Code
00
Adr 0x10, bit 7:6
Function
I(ACO) ca. 6.25% Isc(ACO)
Sine/cosine square control
Sum control
01
...
I(ACO) ≈ 3.125% ∗ (Code + 1) ∗ Isc(ACO)
10
Constant current source
Not permitted (device test only)
11
0x1F
I(ACO) ca. 100% Isc(ACO)
Notes
See Elec. Char. No. 602 for Isc(ACO)
Table 38: Controller Operating Modes
Table 42: I(ACO) With Constant Current Source
ADJ (6:5)
Adr 0x10, bit 5:4
Function
Code
00
5 mA - Range
10 mA - Range
25 mA - Range
50 mA - Range
01
10
11
Table 39: ACO Output Current Range (applies for con-
trol modes and constant current source)
ICHAUS [ IC-HAUS GMBH ]
