iC-MR 13-BIT S&H SIN/COS
INTERPOLATOR WITH CONTROLLER INTERFACES
Rev A1, Page 25/44
+5V
V(ADCSLOP)
2,3kΩ
12kΩ
VDDA
ADC
V(KTY84)
KTY84
12 Bit
16 Bit
TEMP
12 Bit
ADC
16 Bit
ADCOFF
Figure 11: Schematic circuit diagram for the evaluation of KTY sensors.
The temperature is output according to Table 36 as a To obtain the output given in Table 36 the evaluation
16-bit value in two’s complement format with a resolu- circuitry is calibrated as follows:
tion of 1/10°C.
1. The maximum convertible voltage is set and thus
the increase in the converter using register AD-
CSLOP. ADCSLOP’s register is set so that there
is a difference of 2,400 between the converter
values at R(KTY84) = 359 Ω and R(KTY84) =
1,722 Ω.
TEMP
Code
0x7FFF
...
Addr 0x6B, 0x6A, bits: 15..8, 7..0
Temperature
+3276.7 °C
...
Validity
Out of
measuring range
0x07D0
...
+200.0 °C
...
0x0001
0x0000
0xFFFF
...
+0.1 °C
0.0 °C
-0.1 °C
...
2. To map ADC’s output onto the range of values
given in Table 36, an offset is added through reg-
ister ADCOFF. The data in register ADCOFF is
set so that 0xFE70 is read at R(KTY84) = 359 Ω
and, correspondingly, 0x07D0 at R(KTY84) =
1,722 Ω.
Measuring range
0xFE70
...
-40 °C
...
Out of
0x8000
-3276.8 °C
measuring range
(a) Read out converter data from regis-
ter TEMP with ADCOFF = 0x0000 at
R(KTY84) = 359 Ω.
Table 36: Temperature data output format
(b) Calibration data = converter data + 400
(c) Write the calibration data to register AD-
COFF.
Figure 12: Calibrating the temperature sensor to the
output format
ICHAUS [ IC-HAUS GMBH ]
