IC-MR Datasheet, PDF (24/44 Pages) IC-Haus GmbH – 13-BIT S&H SIN/COS INTERPOLATOR WITH CONTROLLER INTERFACES

iC-MR 13-BIT S&H SIN/COS
preliminary
INTERPOLATOR WITH CONTROLLER INTERFACES
The control’s operating range and the input signal am-
plitudes supplied to the control unit are both monitored.
Should any error occur during monitoring, these can be
output.
ACOC
Code
0x00
0x01
Rev A1, Page 24/44
Addr 0x00, bit 4:0
Constant current source ACOT = 11
I(ACO) ≈ 3.125 % Isc(ACO)
I(ACO) ≈ 6.250 % Isc(ACO)
So that the signals at the input pins PSO, NSO, PCO, ...
and NCO can be calibrated without control interfer-
ence, the current source at pin ACO can be set to a 0x1F
constant current (Table 28).
Note
I(ACO) ≈ 3.125 % * (Code + 1) * Isc(ACO)
I(ACO) ≈ 100 % Isc(ACO)
Isc(ACO) see characteristics no. 802
Table 32: Setpoint current source (ACO output cur-
rent)
12-BIT A/D CONVERTER
The IC features a 12-bit A/D converter, which output
data is stored in the TEMP register and can be read
out from here through the interfaces. The A/D con-
verter operates constantly, updating the data in regis-
ter TEMP after each conversion. The TEMP register
cannot be read by bytewise access to addresses 0x6A
and 0x6B, as otherwise it is not guaranteed that a con-
tiguous data word is read out. The temperature data
must be read out by the cyclic telegram.
The A/D converter can be calibrated using registers
ADCSLOP and ADCOFF. Register ADCSLOP has 8
bits and is used to set the maximum voltage the con-
verter can process at pin ADC. The allocation of the
register data in ADCSLOP to the maximum voltage is
expressed in Table 33. Using the second calibration
register ADCOFF, which has 16 bits, an offset can be
added to the converter’s digital output data.
ADCSLOP
Addr. 0x11; bit 7...0
R/W
Code
Full scale level for VDDA = 5V
0x00
2.0 V
0x01
2.00196 V
...
2.0 V + 1.96 mV * ADCSLOP
0xFF
2.5 V
Table 33: Maximum ADC input voltage ADC
Registers TEMPHI and TEMPLO define the upper and
lower thresholds for error output. If the current con-
verter value is above TEMPHI or below TEMPLO, the
ERR_TMP alarm bit is set in the error register. The
internal ADC can be utilized to continuously record
an external temperature, for which a temperature-
dependent voltage is applied at pin ADC. This can be
generated by a KTY temperature sensor. A tempera-
ture monitor can be created using thresholds TEMPHI
and TEMPLO. By way of example, the following de-
scribes the evaluation of temperature sensor KTY 84.
TEMPLO
Addr. 0x14...0x15;
R/W
TEMPHI
Addr. 0x16...0x17;
R/W
Code
Temperature threshold
0x7FFF +3276.7 °C
...
...
0x07D0 +200.0 °C
...
...
0x0001
+0.1 °C
0x0000
0.0 °C
0xFFFF -0.1 °C
...
...
0xFE70 -40 °C
...
...
0x8000
-3276.8 °C
Note
Thresholds for example KTY 84
ADCOFF
Code
0x7FFF
...
0x0001
0x0000
0xFFFF
...
0x8000
Addr. 0x12...0x13;
Function
TEMP = TEMP(int) + 32767
TEMP = TEMP(int) + 1
TEMP = TEMP(int)
TEMP = TEMP(int) - 1
TEMP = TEMP(int) - 32768
R/W
Table 35: Temperature thresholds
Figure 11 shows a schematic circuit diagram for the
evaluation of the KTY. A resistor of approximately 2.3
kΩ is switched in series with the KTY sensor to lin-
earize the voltage supplied by the KTY. This results in
a linear temperature voltage.
Table 34: Digital temperature offset value