sca3060 VTI Hamlin, sca3060 Datasheet - Page 5

• Manufacturer Part Number: sca3060
• Description: 3-axis Accelerometer
• Manufacturer: VTI Hamlin

1.1.2 Interrupt
1.1.3 Output ring buffer
2
2.1 Reset and power up
2.2 Operation modes
2.2.1 Normal measurement mode
2.2.2 Wide band measurement mode
2.2.3
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Reset and power up, Operation Modes, HW functions and Clock
Usage
The SCA3060 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.
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 SCA3060 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 SCA3060 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 SCA3060 will read configuration and calibration data from non-volatile
memory to volatile registers. Then the SCA3060 will make a check sum calculation to the read
memory content. The STATUS register's CSME-bit="0" shows successful memory read operation.
The SCA3060 enters the measurement mode by default after power-on and the CV-converter will
start to feed data to the signal channel. Data will be reliable in the output registers after the product
specific turn-on time.
In wide band measurement mode, the signal bandwidth of the SCA3060 is increased by removing
low-pass filtering in signal channel. In addition, the output data rate is doubled.
Measurement modes can be selected by setting the bits called MODE_BITS in MODE register.
See section 3.4 for MODE register details.
Acceleration data can be read from data output registers X_LSB, X_MSB, Y_LSB, Y_MSB, Z_LSB
and Z_MSB in all measurement modes. Each of these registers can be read one by one or using
the decremented register read, which is described in section 4.1.3.2 for SPI and 4.2.1.3 for I
interface. See section 3.3 for output register details.
Doc.Nr. 82 1150 00
overflows,
2
C bus. Once the interrupt has
the oldest data is lost
SCA3060 Series
Rev B
5/ 31
2
C