IC-MG_14 Datasheet, PDF (16/22 Pages) IC-Haus GmbH – 8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER

iC-MG
8-Bit Sin/Cos INTERPOLATION IC WITH RS422 DRIVER
SIGNAL LEVEL CONTROL and SIGNAL MONITORING
Rev D1, Page 16/22
Via the controlled sensor current source (pin PWR) iC-
MG 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 (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
Table 23: PWR Output Current Range (applies for con-
trol modes and constant current source)
ADJ (8:7)
Code
00
01
10
11
Adr 0x10, bit 7:6
Function
Control to sine/cosine square
Control to sum of sine/cosine
Constant current source
Not permitted
Table 24: PWR Output Operating Mode
Notice: 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 Loss-of-Signal Error and PWR
Control Out-of-Range Error (at max. limit) for monitoring
and configure EMASKA accordingly.
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 %)
...
≈
300
mV
77
77−(1.25∗Code)
Vpp() ca. 500 mV (98 %)
...
Vpp() ca. 600 mV (120 %)
Table 25: Setpoint Square Control
(internal sin/cos signal amplitude)
Figure 3: 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
0x00
120 mV...390 mV
0x01
122 mV...397 mV
...
...
ADJ (4:0)
0x19
...
0x1F
Vt()min ... max
200 mV ...650 mV
...
240 mV...780 mV
Table 26: Signal Monitoring (nominal values)
The signal monitoring limits are tracked according to
ADJ (4:0) and fit for square control mode. When us-
ing sum control mode a different operating point can
be required for which the monitoring limits may not be
suitable. In this case signal monitoring should be dis-
abled via the error mask (see EMASKA etc.).
ADJ (4:0)
Code
0x00
0x01
...
0x1F
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Sum control ADJ(8:7) = 01
VDCS + VDCC ca. 245 mV
VDCS + VDCC ca. 249 mV
...
≈
245mV
77
77−(1.25∗Code)
VDCS + VDCC ca. 490 mV
Table 27: Setpoint Sum Control (DC value)
ADJ (4:0)
Code
0x00
0x01
...
0x1F
Notes
Adr 0x10, bit 3:0; Adr 0x0F, bit 7
Constant current source ADJ(8:7) = 10
I(PWR) ca. 3.125% Isc(PWR)
I(PWR) ca. 6.25% Isc(PWR)
... ≈ 3.125% ∗ (Code + 1) ∗ Isc(PWR)
I(PWR) ca. 100% Isc(PWR)
See Elec. Char. No. 602 for Isc(PWR)
In operation with the active square control mode
ADJ(4:0) sets the internal signal amplitudes accord-
ing to the relation (PCHS-NCHS)² + (PCHC-NCHC)²;
these should be set to 0.25 Vpk.
Table 28: Setpoint Current Source