User Manual
679
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Measurement Unit
22
Measurement Unit
22.1
Features
• 1 x 10 Bit ADC with 13 Inputs including attenuator allowing measurement of high voltage input signals
• Supply Voltage Attenuators with attenuation of
VBAT_SENSE
,
VS, MONx
,
P2.x
.
• 1 x 8 Bit ADC with 7 Inputs including attenuator allowing measurement of high voltage input signals
• Supply Voltage Attenuators with attenuation of
VS, VDDEXT, VDDP
,
VBG, VDDC, TSENSE_LS,
TSENSE_CENTRAL
.
• VBG monitoring of 8 Bit ADC to support functional safety requirements.
• Temperature Sensor for monitoring the chip temperature and Low Side module temperature.
• Supplement Block with Reference Voltage Generation, Bias Current Generation, Voltage Buffer for NVM
Reference Voltage, Voltage Buffer for Analog Module Reference Voltage and Test Interface.
22.2
Introduction
The measurement unit is a functional unit that comprises the following associated sub-modules:
22.2.1
Block Diagram
The Structure of the Measurement Functions Module is shown in the following figure.
Table 358 Measurement functions and associated modules
Module
Name
Modules
Functions
Central
Functions Unit
Bandgap reference c
current reference circuit
The bandgap-reference sub-module provides two
reference voltages
1. an accurate reference voltage for the 10-bit and 8-
bit ADCs. A local dedicated bandgap circuit is
implemented to avoid deterioration of the reference
voltage arising e.g. from crosstalk or ground voltage
shift.
2. the reference voltage for the NVM module
10 Bit ADC (ADC1) 10-bit ADC module with 13
multiplexed analog inputs
VBAT_SENSE, VS and MONx measurement.
Six (5V) analog inputs from Port 2.x
8 Bit ADC (ADC2) 8-bit ADC module with 7
multiplexed inputs
VS/VDDEXT/VDDP/VBG/VDDC/TSENSE_LS and
TSENSE_CENTRAL measurement.
Temperature
Sensor
Temperature sensor readout
amplifier with two multiplexed
Δ
Vbe-sensing elements
Generates outputs voltage which is a linear function
of the local chip (Tj) temperature.
Measurement
Core Module
Digital signal processing and ADC
control unit
1. Generates the control signal for the 8-bit ADC 2 and
the synchronous clock for the switched capacitor
circuits (temperature sensor)
2. Performs digital signal processing functions and
provides status outputs for interrupt generation.