SMB380 Jennic, SMB380 Datasheet - Page 13

• Manufacturer Part Number: SMB380
• Description: Smb380 Triaxial Acceleration Sensor
• Manufacturer: Jennic

Example 2:
Under this example conditions, t
If a latched interrupt is generated, this can be used to wake-up a microprocessor. The sensor IC
will wait for a reset_INT command and restart interrupt verification. SMB380 can not go back to
sleep mode if reset_INT is not issued after a latched interrupt.
If a not-latched interrupt is generated, the device waits in the normal mode till the interrupt
condition disappears. The minimum duration of interrupt activation is 330µs. If no interrupt is
generated, the sensor IC goes to sleep mode for a defined time (wake_up_pause).
3
These bits (address 15h, bit 2 and 1) define the sleep phase duration between each automatic
wake-up.
Table 5: Setting
3.1.6 Shadow_dis
SMB380 provides the possibility to block the update of data MSB while LSB are read out. This
avoids a potential mixing of LSB and MSB of successive conversion cycles. When this bit
(address 15h, bit 3) is at 1, the blocking procedure for MSB is not realized and MSB only
re
Rev. 1.3
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7211RB11
.1.5 Wake_up_pause
ading is possible.
. Specifications are subject to change without notice.
wake_up_pause<1:0>
00
01
10
11
if
any_motion_dur=01 and wake_up_pause=10 (360ms) the maximum operational
time is:
s of wake_up_pause
bandwidth=110
i) Wait for 1ms to have a stable acceleration value (wake-up time)
ii) Acquire four data (each 330µs) to calculate first any motion criterion
iii) Two further data conversions to enable verification of series of three
any motion criteria.
he maximum operational time is 1ms+6*333µs=3ms.
Triaxial acceleration sensor
Preliminary Data Sheet
(1.5kHz),
Sleep phase duration
SMB380
Page 13
2560 ms
320 ms
20 ms
80 ms
any_motion=1
(AND
enable_adv_INT=1),
Bosch Sensortec
18-September-2007