L9678P datasheet(141/215 Pages) STMICROELECTRONICS

141 / 215 page

DS11626 Rev 9

141/216

L9678P, L9678P-S

DC sensor interface

214

DC sensor interface

L9678P 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: 2 mA to 20 mA.

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

range of 1 mA to 2 mA.

Hall sensor and switch interface block diagram is shown below.

Figure 38. Switch 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 setting CHID bits accordingly. The interface activation is completely controlled by

user SPI command. The interface could be optionally configured for "automatic switch-off"

immediately after the current or resistance measurement completion by setting the

EN_AUTO_SWITCH_OFF bit in the SYS_CFG register.

GAPGPS01140

Ilim

VBG

DCSx

IDCS

IDCS/100

100

Vref = 2v5

10bits

Digital word = DCx voltage pin or ISAT

Open load if Iout (DCx) lower than 1.9mA

10nF÷100nF

Iref

VGND =

± 1V

VRESDIAG

Vref

Vin

100

6.125*R1

AxR

LV analog mux

Blocks shared /multiplexed

among the the different channels

8*R2

VINT3V3

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