CMR3000-D0X VTI Hamlin, CMR3000-D0X Datasheet - Page 7

• Manufacturer Part Number: CMR3000-D0X
• Description: Cmr3000-d0x Block Diagram With Digital Spi And I 2 C Interface
• Manufacturer: VTI Hamlin

2
2.1 Reset and power up
2.2 Power Down mode
2.3 Measurement Mode
2.3.1
2.3.2
2.4 Stand By Mode
2.5 Interrupt function (INT-pin)
2.6 Clock
VTI Technologies Oy
Myllynkivenkuja 6
P.O. Box 27
FI-01621 Vantaa
www.vti.fi
Reset and power up, Operation Modes, HW functions and Clock
Description
Usage
The CMR3000 has internal power-on reset circuit. It releases the internal reset-signal once the
power supplies will be within the specified range. After releasing the internal reset, the CMR3000
will read configuration and calibration data from the non-volatile memory to volatile registers. Then
the CMR3000 will make parity check to the read memory content. The STATUS register's PERR-
bit="0" shows successful memory read operation.
Device can be externally reset by writing RESET=1b to CTRL register and then waiting 2 ms for
reset to complete.
The CMR3000-D0X enters the power down mode by default after power-on reset and initialization
of the volatile registers. PD can also be set by writing MODE[1:0] = 00b to CTRL register.
Output registers will keep their content in the power down mode.
The CMR3000-D0X is set to a measurement mode by writing MODE[1:0] = 1Xb to CTRL register.
Data will be reliable in the output registers after the product specific turn-on time.
Sample rate is 2000 Hz. The measurement bandwidth is 80 Hz (MODE[1:0] = 11b) or 20 Hz
(MODE[1:0] = 10b).
INT-pin gives an interrupt by default when new data is available.
Angular rate data can be read from data output registers X_LSB, X_MSB, Y_LSB, Y_MSB, Z_LSB
and Z_MSB. See section 2.5 for INT-pin configuration details.
The CMR3000-D0X is set to Stand By mode by writing MODE[1:0] = 01b to CTRL register. No
measurement data will be available in the output registers.
As the startup-up time from Stand By to Measurement mode is much faster than from Power Down
to Measurement mode, Stand By mode can be used to optimize system level power consumption.
Due to operation principle, Stand By mode must be preceded by starting up the device in
Measurement mode.
Interrupt polarity (active high/low) can be configured with CTRL register's INT_LEVEL bit.
INT pin is automatically cleared by reading the angular rate output data. INT-pin data ready
functionality can be disabled by setting the CTRL register's INT_DIS bit. See section 3.3 for CTRL
and INT_STATUS register details.
The CMR3000 has an internal factory trimmed oscillator and clock generator.
Doc.Nr. 82112900.A.02
CMR3000-D0X Series
Rev. A.02
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