E981.07 Datasheet, PDF (42/46 Pages) ELMOS Semiconductor AG – Two independent operating channels

Two Channel Sensor Interface PSI5
ADVANCE PRODUCT INFORMATION JUL 26, 2011
5.3 External Oscillator
E981.07
The received data messages are stored in data registers, which can be read out by the MCU via the SPI
interface. In order to realise a time base for the sampling of the satellite data, an external clock of typical 4MHz
respectively 8MHz (CLK) is provided to the device. In case of a disconnection of CLK, the channels will be
switched off.
In case of disconnection of the oscillator the sensor data response is a hardware error.
5.4 Power On Reset
The power-on reset enables the logic. The reset is only related to V3_3. The logic can operate without a supply
from VBUS and VSYNC.
5.5 Over Temperature Switch Off
The circuit provides an over temperature protection independent for each channel. Due to a failure like short
circuit, the circuit will react as follows.
When the chip temperature increases up to 170^o C, the over temperature protection will be activated and the
affected satellite interface will be switched off. The temperature switch off operates independently from the
external system clock (CLK) and is only dependent on the internal oscillator (fOSC ).
The failure mode is reported as an hardware error via SPI. The hardware error bit can be cleared, by clearing
the LE bit in the LINE_ENABLE command. The regulator can be reactivated manually by setting the LE bit in
the LINE_ENABLE command to '1'.
ELMOS Semiconductor AG
Data Sheet 42 / 45
QM-No.: 25DS0050E.00
This document contains information on a new product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.