MLX16305(2006) View Datasheet(PDF) - Melexis Microelectronic Systems

Part Name

Description

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MLX16305
(Rev.:2006)

Interlock switch sensor interface IC

Melexis Microelectronic Systems  

MLX16305

Interlock switch sensor interface IC

9. Voltage Mode (VM)

To go into Voltage Mode (VM) VI_CTRL is set low. In this mode the resulting voltage on the SENSE pin

(VSENSE) is copied onto the MEAS_OUT pin. For normal operating conditions (Vref>Vsense) it can be

calculated back as:

• for 3V < VSENSE < 8.25V

- VMEASOUT min = [VSENSE * (1 - Meas_Verr1)] / 2 - VMEASOUT_VOFFSET

- VMEASOUT max = [VSENSE * (1 + Meas_Verr1)] / 2 + VMEASOUT_VOFFSET

• for VSENSE < 3V the accuracy is reduced to Meas_Verr2.

This condition can occur

- with a short to GND

- or for detecting shorts to an external voltage below 3V. This case can be diagnosed by

selecting a pin without supplying it with the regulated voltage. Any voltage that is

measured has to be due to an external source that is connected to that pin.

• for VSENSE > VREF (short to supply)

- VMEASOUT max < VREF + 0.5V

This condition can be diagnosed with the SENSE pin in high impedant state (weak pull down is

active), as well as in the state with the channel is supplied with the regulated voltage.

Remark

• When a SENSE pin is measured in Voltage Mode (VM) without being supplied by the voltage

regulator, then an internal pull down keeps the voltage on that SENSE pin low, unless it is

overruled by a short to supply.

o If no short to VBAT is forced then:

VMEASOUT < VMEAS_DIS

3901016305

Rev. 005

Page 13 of 29

Data Sheet

Oct/06

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