VD5377 Datasheet, PDF (50/88 Pages) STMicroelectronics – Ultra-low power motion sensor for optical finger navigation

Basic start-up information
VD5377
Addr
(Hex)
Register name
21 X_MOTION
22 Y_MOTION
23 OVERFLOW
Table 29. X/Y motion data
Signal name
Bit
Type
Default
(Hex)
Comment
x_motion
y_motion
x_overflow
7:0 PR
7:0 PR
0 PR
X motion data since last polling
00
was done. Note that the internal
accumulator is reduced from this
value every time it is read.
Y motion data since last polling
00
was done. Note that the internal
accumulator is reduced from this
value every time it is read.
This register records if the X-
motion integrator has reached its
00 ^limit.
0 = No overflow
1 = Overflow
y_overflow
Reserved
1 PR
2 PR
This register records if the Y-
motion integrator has reached its
00 ^limit.
0 = No overflow
1 = Overflow
00 Reserved
no_motion
3 PR
This bit is asserted as long as
both X/Y integrators are empty
(logical or between motion_w and
01 _{motion_y).}
0 = Motion
1 = No motion
motion_acc_flush_
en
adapt_cpi_en
Reserved
5
PRWC
00
If set this bit flushes the motion
accumulators (self cleared).
6 RW
If set the CPI is function of the
detected motion
00 _{0 = No adaptive CPI}
1 = Enable adaptive CPI
7 PRW
00 Reserved
50/88
Doc ID 022952 Rev 2