iC-MQ
PROGRAMMABLE 9-BIT
Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
Rev D4, Page 25/39
SIGNAL LEVEL CONTROL and SIGNAL MONITORING
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 set-
ting the signal conditioning; the current range for the
highside current source is adjusted using ADJ(6:5).
ADJ (4:0)
Code
0x00
0x01
...
0x19
...
0x1F
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Square control
ADJ(8:7) = 00
Vpp() ca. 300 mV (60 %)
Vpp() ca. 305 mV (61 %)
77
Vpp()
≈
300
mV
77−(1.25∗Code)
Vpp() ca. 500 mV (98 %)
...
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
0x00
0x01
...
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
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).
ADJ (8:7)
Code
00
01
10
11
Adr 0x10, bit 7:6
Function
Sine/cosine square control
Sum control
Constant current source
Not permitted (device test only)
0x1F
VDC1 + VDC2 ca. 490 mV
Table 41: DC Setpoint For Sum Control
ADJ (4:0)
Code
0x00
0x01
...
0x1F
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Constant current source
ADJ(8:7) = 10
I(ACO) ca. 3.125% Isc(ACO)
I(ACO) ca. 6.25% Isc(ACO)
I(ACO)
≈
3.125%
∗
(Code + 1)
∗
Isc(ACO)
I(ACO) ca. 100% Isc(ACO)
See Elec. Char. No. 602 for Isc(ACO)
Table 38: Controller Operating Modes
ADJ (6:5)
Code
00
01
10
11
Adr 0x10, bit 5:4
Function
5 mA - Range
10 mA - Range
25 mA - Range
50 mA - Range
Notes
Table 42: I(ACO) With Constant Current Source
Table 39: ACO Output Current Range (applies for con-
trol modes and constant current source)
ICHAUS [ IC-HAUS GMBH ]
