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L9679P データシート(PDF) 186 Page - STMicroelectronics

部品番号 L9679P
部品情報  Automotive advanced airbag IC for mid/high end applications
PDF  272 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P データシート(HTML) 186 Page - STMicroelectronics

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DC sensor interface
L9679P
186/272
DocID029275 Rev 1
11
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 is 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 accordingly 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.



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