L9679P datasheet(187/279 Pages) STMICROELECTRONICS

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DS11627 Rev 7

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L9679P

DC sensor interface

278

DC sensor interface

L9679P implements a circuitry able to interface with a variety of positioning sensors. The

sensors that can be connected to the device are Hall-effect, resistive or simple switches.

Range of measurements is:



Resistive sensor: 65 Ωto 3 kΩ



Hall-effect sensor: 1 mA to 2 0 mA.

Within the above ranges, accuracy of ±15% is granted. A reduced accuracy is given in the

range 1 mA to 2 mA. Hall sensor and switch interface block diagram are shown below.

Figure 47. DC sensor interface block diagram

The global SPI contains several bits to control and configure the interface. The SWOEN bit

is used to enable the output voltage on DCSx pins. The channel to be activated can be

chosen by properly setting CHID bits. The interface activation is started and switched off

upon user SPI command. Alternatively it could be configured via the

SYS_CFG(EN_AUTO_SWITCH_OFF) bit to automatically switch off as soon as the

measurement is complete, in case of current or resistance measurements; this would help

preventing thermal conditions. The interface would not auto-switched off in case of voltage

measurement, instead.

Ilim

VBG

DCSx

IDCS

IDCS/100

100

Vref = 2v5

10bits

10nF÷100nF

IREF_DCS

VGND = ± 1V

SYNCBOOST

Vref

Vin

100

6.125*R1

AxR

MUX

Blocks shared/multiplexed

among the the different channels

7.8*R2

VINT3V3

VOFF_DCS

10bits

Vref

Vin

IPD_DCS

ADC MAIN

ADC IDCS

GAPGPS02288

L9679P Datasheet(PDF) 187 Page - STMicroelectronics

L9679P Datasheet(HTML) 187 Page - STMicroelectronics

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