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VD5377 Fiches technique(PDF) 49 Page - STMicroelectronics

No de pièce VD5377
Description  Ultra-low power motion sensor for optical finger navigation (OFN)
PDF  88 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VD5377 Fiches technique(HTML) 49 Page - STMicroelectronics

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VD5377
Basic start-up information
8.3
Reading X/Y motion data
The host can service motion data either by polling the motion signal on a regular basis or by
using the motion signal to generate a host interrupt. The procedure for reading X/Y motion
vectors is shown in Figure 20.
Figure 20. Reading X/Y motion
Note:
X/Y motion registers 0x21 and 0x22 must be read consecutively using a multiple location
I2C read sequence. See Section 11.4.4: Multiple location read on page 66.
X/Y motion data is stored internally in a 17-bit accumulator ensuring that no data is lost even
if the host CPU is delayed responding to motion. X/Y motion data is read from the
accumulator using register 0x21 and 0x22 (see Table 29). 0x21/0x22 are 8-bit registers
comprising 7 bits of data plus 1 sign bit. The X/Y_overflow bits (register 0x23 bits 0 and 1)
indicate when the X/Y motion registers are full and there is more than 1 byte of data to be
read. There is no overflow indicator for the accumulator but it is unlikely that an overflow will
ever happen in practice.
Read X/Y Motion
More Motion?
no
Exit
yes
Motion detected?
no
(registers 0x21/0x22)
yes



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