sca3000-e05pwb VTI Hamlin, sca3000-e05pwb Datasheet - Page 7

• Manufacturer Part Number: sca3000-e05pwb
• Description: Sca3000 Series 3-axis Accelerometer
• Manufacturer: VTI Hamlin

1.2.7 Interrupt
1.2.8
1.2.9 Output ring buffer
2
2.1 Reset and power up
2.2 Measurement Mode
2.2.1
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Reset and power up, Operation Modes, HW functions and Clock
Temperature output
Description
The SCA3000 has a dedicated output pin (INT) to be used as the interrupt for the master controller.
Interrupt conditions can be activated and deactivated via the SPI or I
happened, the interrupt source can be read out from the corresponding status register.
Some SCA3000 products provide 9-bit temperature information via the serial interface. See Table 1
for detailed product information.
In those applications where real time acceleration information is not needed, the ring buffer
memory can be used to buffer acceleration data. This will release µC resources for other tasks or
for example, to offer a power saving mode while SCA3000 samples acceleration data into its buffer
memory.
Acceleration data is sampled at a constant sample rate by the sensor. The buffer is a FIFO type
(First In First Out) where the oldest data is shifted out first. It has separate read and write address
pointers, so it can be read and written simultaneously. If the buffer
and the new data replaces the oldest samples.
Ring buffer logic can be configured to give an interrupt when the buffer is ½ or ¾ full. The entire
ring buffer content can be read by one read sequence.
The SCA3000 has an external active low reset pin. Power supplies must be within the specified
range before the reset can be released.
After releasing the reset, the SCA3000 will read configuration and calibration data from the non-
volatile memory to volatile registers. Then the SCA3000 will make a check sum calculation to the
read memory content. The STATUS register's CSME-bit="0" shows successful memory read
operation.
The SCA3000 enters the measurement mode by default after power-on and the CV-converter will
start to feed data to the signal channel (Figure 1). Data will be reliable in the output registers after
the product specific turn-on time.
The SCA3000 can also be set to optional measurement modes. See component specific data
sheets for detailed functional parameters in all measurement modes. All available measurement
modes for the SCA3000 are described in Table 2 below.
Doc.Nr. 8257300A.07
overflows,
2
C bus. Once the interrupt has
the oldest data is lost
SCA3000 Series
Rev.A.07
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