L9663 datasheet(33/104 Pages) STMICROELECTRONICS

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L9663

Satellite interface

103

As safety feature, the IC always checks that after a valid data read the code 1F0 is written in

the buffer.

If this check fails a Buffer Empty Fault is latched (BEx bits in SR2 register) and it's cleared

after SPI read. Buffer empty fault asserts also Global Status Bit.

In order to allow the μC to test this feature a test of buffer empty check is implemented (see

Section 3.7.3 and STSR register for details).

3.3.3

Interrupt generator

The microcontroller interrupt module describes the function of the interrupt pins to generate

a microcontroller interrupt if the data buffers are filled with sensor data.

Basic features:



Configurable interrupt pins



Interrupt generation when data buffer is full

The interrupt pins generate an interrupt for the microcontroller if the receive buffer

corresponding to a transceiver interface is filled completely: the interrupt pin is then reset

when the receive buffer is empty.

Asynchronous operation:

The interrupt pin is set to high when the number of received data since the last reading of

the buffers are empty.

Synchronous operation:

The interrupt pin is set to high when all the buffers configured by SPI are full. The interrupt

pin is set to low when all the buffers are empty.

Figure 18. Block diagram with interrupt pins

After reset, the output pin is configured as DOUTx.

3.3.4

Automatic storage of sensor initialization data

If the sensor uses a data range initialization procedure and the PSI5 payload is 20 bit with 3

frame control bits, 1 status bit, 16 bit data, the device can be configured so that the

initialization data is stored in the transceiver IC and can be read via SPI.

In case of serial messaging method, the data must be extracted at application layer.

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