BMA222-SHUTL Bosch Sensortec, BMA222-SHUTL Datasheet - Page 28

• Manufacturer Part Number: BMA222-SHUTL
• Description: BMA222 DAUGHTERCARD FOR DEV KIT
• Manufacturer: Bosch Sensortec
• Series: -r

Specifications of BMA222-SHUTL

• Sensor Type: Accelerometer, 3 Axis
• Sensing Range: ±2g, 4g, 8g, 16g
• Interface: I²C, Serial, SPI
• Sensitivity: 64LSB/g, 32LSB/g, 16LSB/g, 8LSB/g
• Voltage - Supply: -
• Embedded: No
• Utilized Ic / Part: BMA222
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 828-1026

4.8.6.3 Selecting the timing of tap detection
For each of parameters (0x2A) tap_shock and (0x2A) tap_quiet two values are selectable. By
writing ´0´ (´1´) to bit (0x2A) tap_shock the duration of (0x2A) tap_shock is set to 50 ms (75 ms).
By writing ´0´ (´1´) to bit (0x2A) tap_quiet the duration of (0x2A) tap_quiet is set to 30 ms (20
ms).
The length of (0x2A) tap_dur can be selected by setting the (0x2A) tap_dur bits according to
table 15:
4.8.6.4 Axis and sign information of tap sensing
The sign of the slope of the first tap which triggered the interrupt is stored in bit (0x0B) tap_sign
(´0´ means positive sign, ´1´ means negative sign). The value of this bit persists after clearing
the interrupt.
The axis which triggered the interrupt is indicated by bits (0x0B) tap_first_x, (0x0B) tap_first_y,
and (0x0B) tap_first_z.
The bit corresponding to the triggering axis contains a ´1´ while the other bits hold a ´0´. These
bits are cleared together with clearing the interrupt status.
4.8.6.5 Tap sensing in low power mode
In low-power mode, a limited number of samples is processed after wake-up to decide whether
an interrupt condition is fulfilled. The number of samples is selected by bits (0x2B) tap_samp
according to table 16.
Rev. 1.0
© Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such
as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany.
Note: Specifications within this document are subject to change without notice.
Table 16: Meaning of (0x2B) tap_samp
tap_dur
tap_samp
(0x2A)
000b
001b
010b
011b
100b
101b
110b
111b
(0x2B)
Table 15: Selection of tap_dur
00b
01b
10b
11b
Data sheet
BMA222
Page 28
length of tap_dur
Number of
200 ms
250 ms
100 ms
150 ms
375 ms
500 ms
700 ms
Samples
50 ms
16
2
4
8
Bosch Sensortec
07 March 2011