PAN301BSI-208 Datasheet, PDF(16/27 Page) Pixart Imaging Inc. – CMOS HIGH PERFORMANCE OPTICAL MOUSE SENSOR

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PAN301BSI-208 Datasheet, PDF (16/27 Pages) Pixart Imaging Inc. – CMOS HIGH PERFORMANCE OPTICAL MOUSE SENSOR

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PixArt Imaging Inc.

PAN301BSI-208

CMOS Optical Mouse Sensor

changed on falling edges of SCLK and read on every rising edge of SCLK. The micro-controller must go

to a high Z state after the last address data bit. The PAN301BSI-208 will go to the high Z state after the

last data bit.

SCLK

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

SDIO

DON'T

CARE

A1 A0 Hi-z D7

D0 Hi-z

R/W bit of next address

SDIO driven by Micro-controller

SDIO driven by PAN301BSI-208

Note "A"

SCLK

SDIO

1. Micro-controller send address to PAN301BSI-208.

2. Micro-controller release and set SDIO to Hi-Z after the last address bit.

Hi-Z

tHOLD

3us,min

Note "B"

1. PAN301BSI-208 send data to Micro-controller .

2. PAN301BSI-208 release and set SDIO to Hi-Z after the last data bit.

SCLK

SDIO

Hi-Z

R/W bit of next address

SDIO driven by micro-controller

Figure 11. Read operation

6.2 Re-Synchronous Serial Interface

There are times when the SDIO line from the PAN301BSI-208 should be in the Hi-Z state. If the

microprocessor has completed a write to the PAN301BSI-208, the SDIO line is Hi-Z, since the SDIO pin

is still configured as an input. However, if the last operation from the microprocessor was a read, the

PAN301BSI-208 will hold the D0 state on SDIO until a rising edge of SCLK. To place the SDIO pin into

the Hi-Z state, first raise the PD line, and then toggle the SCLK line from high to low to high. The SDIO

line will now be in the Hi-Z state. The PAN301BSI-208 and the micro-controller might get out of

synchronization due to following condition.

1us,min

SCLK

SDIO

Hi-Z

ADDRESS(R/W)

DATA

Figure 12. Forcing PAN301BSI-208 SDIO line to the Hi-Z state

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PixArt Imaging Inc.

E-mail: fae_service@pixart.com.tw

V1.1, MAY. 2004

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