TLE9832 datasheet(49/94 Pages) INFINEON

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TLE9832

Functional Description

Data Sheet

Rev. 1.1, 2012-03-08

3.18

Measurement Unit

The measurement unit is a functional unit that comprises the following associated sub-modules:

•

1 x 8 Bit ADC (ADC2) with 10 inputs. 5 are for single ended input signals and 5 are for differential input signals.

•

Monitoring inputs voltage attenuators with two selectable attenuation settings: divide by 4 and divide by 6

•

Supply voltage attenuators with attenuation of VBAT_SENSE, VS, VDDP and VDDC.

•

VBG monitoring of 8-Bit ADC (ADC2) to guarantee functional safety requirements.

•

Low Side Switch current sensing of LS1 and LS2. Allows a scalable overcurrent pre warning.

•

Temperature sensor for monitoring the chip temperature and Low Side Switches temperature.

•

Supplement block with reference voltage generation, bias current generation, voltage buffer for Flash

reference voltage, voltage buffer for analog module reference voltage and test interface.

The structure of the measurement functions module is shown in Figure 29.

Table 10

Measurement functions and associated modules

Module

Name

Modules

Functions

Central Functions

Unit

Bandgap reference circuit

The bandgap-reference sub-module provides two

reference voltages

1. a trimmable reference voltage for the 8-Bit ADC. 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 Flash module

8-Bit ADC (ADC2) 8-Bit ADC module with 10

multiplexed inputs

1. 5 single-ended inputs 0 ... 1.23V

2. 5 differential inputs 0 ... 1.23V

(allocation see following overview figure)

10-Bit ADC

(ADC1)

10-Bit ADC module including analog

test bus interface - part of µC

subsystem

1. VBAT_SENSE measurement on channel 0 of ADC1.

2. VS measurement on channel 2 of ADC1.

3. MONx measurement on channel 6 of ADC1.

4. 5 additional (5V) analog inputs from Port 2.

Supply Voltage

Attenuator

Resistive supply voltage attenuator Scales down the supply voltages of the system to the input

voltage range of ADC1 and ADC2.

Monitoring Input

Attenuator

Resistive attenuator for (HV)

Scales down 5 monitoring input voltages to the input

voltage range of the ADC1.

Central

Temperature -

Low Side Switch

Temperature

Sensor

Temperature sensor readout with

two multiplexed ∆

be sensing

elements

Generates outputs voltage which is a linear function of the

local chip (junction) temperature.

Measurement

Core Module

Digital signal processing and ADC

control unit

1. Generates the control signal for the 8-Bit ADC2 and the

synchronous clock for the switched capacitor circuits,

2. Performs digital signal processing functions and

provides status outputs for interrupt generation.

TLE9832 Datasheet(PDF) 49 Page - Infineon Technologies AG

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