User Manual
691
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Measurement Core Module (incl. ADC2)
Figure 187 Module Block Diagram
23.2.2
Measurement Core Module Modes Overview
The basic function of this unit, is the digital signal processing of several analog digitized measurement signals
by means of filtering, level comparison and interrupt generation. The Measurement Core module processes
eight channels in a quasi parallel evaluation process.
As shown in the figure above, the ADC2 postprocessing consists of a channel controller (Sequencer), an 8-
channel demultiplexer and the signal processing block, which filters and compares the sampled ADC2 values
for each channel individually. The channel control block controls the multiplexer sequencing on the analog
side before the ADC2 and on the digital domain after the ADC2. As described in the following section, the
channel sequence can be controlled in a flexible way, which allows a certain degree of channel prioritization.
This capability can be used e.g. to set a higher priority to supply voltage channels compared to the other
channel measurements. The Measurement Core Module offers additionally two different post-processing
measurement modes for over-/undervoltage detection and for two-level threshold detection.
Usually the external register settings should only be changed during the start-up phase (
“Software Mode”, Sequencer and Exceptional Interrupt Measurement is disabled, each measurement is
triggered by software.
The IIR filter can be bypassed via
for the data transferred to
postprocessing only. The threshold counter can be bypassed (counting only 1 measurement) via
CNT_LO_CHx.
Digital Signal Processing
1st Order IIR
MUX
rfu
VDDEXT
VDDP
VDDC
Temperature Sensor LS
VBG
CH6
CH5
CH4
CH3
CH2
CH1
VREF
Calibration Unit:
y= a + (1+b)*x
+
-
+
-
TH_UP_CHx
TH_LOW_CHx
/
Channel Controller
(Sequencer)
MUX_SEL<2:0>
A D
UP_X_STS
LOW_X_STS
3
/
8
+ / -
+ / -
/
10
/
8
/
1
/
1
ADC2
SOS
EOC
ADC2 - SFR
ADC2_OUT_CHx
Temperature Sensor Central
CH7
VS
CH0
/ 10
rfu
CH8