TLE9877QXA20_15 Datasheet, PDF (66/122 Pages) Infineon Technologies AG – Microcontroller with LIN and BLDC MOSFET Driver for Automotive Applications

22
Measurement Unit
TLE9877QXA20
Measurement Unit
22.1
Features
• 1 x 8-bit ADC with 10 Inputs including attenuator allowing measurement of high voltage input signals
• Supply Voltage Attenuators with attenuation of VS, VDDP and VDDC.
• VBG monitoring of 8-bit ADC to guarantee functional safety requirements.
• Bridge Driver Diagnosis Measurement (VDH, VCP).
• Temperature Sensor for monitoring the chip temperature and PMU Regulator temperature.
• BEMF Comparators for commutation triggering inside BLDC Applications.
• 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:
Table 14 Measurement Functions and Associated Modules
Module
Name
Modules
Functions
Central Functions Bandgap reference circuit
Unit
The bandgap-reference sub-module provides two
reference voltages
1. a trimmable reference voltage for the 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
8-bit ADC (ADC2) 8-bit ADC module with 10
multiplexed inputs, including HV
input attenuator
5 high voltage full supply range capable inputs
(2.5V...30,7V(FS))
2 medium voltage inputs (0..5V/7V FS).
3 low voltage inputs (0..1.2V/1.6V FS)
(allocation see following overview figure)
10-bit ADC
(ADC1)
10-bit ADC module with 8
multiplexed inputs
Five (5V) analog inputs from Port 2.x
VDH Input
Voltage
Attenuator
VDH input voltage attenuator
Scales down V(VDH) to the input voltage range of
ADC1.CH6
Temperature
Sensor
Temperature sensor with two
multiplexed sensing elements:
• PMU located sensor
• Central chip located sensor
Generates output voltage which is a linear function of
the local chip (junction) temperature.
Data Sheet
66
Rev. 1.0, 2015-04-30