ADNS-2620 Avago Technologies US Inc., ADNS-2620 Datasheet - Page 14

• Manufacturer Part Number: ADNS-2620
• Description: Optical Mouse Sensor,DIP
• Manufacturer: Avago Technologies US Inc.

Specifications of ADNS-2620

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 516-2238-5; ADNS-2620; Q2073278A

Forcing the SDIO Line to the
Hi-Z State
There are times when the SDIO line from the ADNS-2620
should be in the Hi-Z state. For example, if the micro-
processor has completed a write to the ADNS-2620, the
SDIO line will go into a Hi-Z state, because the SDIO pin
was configured as an input. However, if the last operation
from the microprocessor was a read, the ADNS-2620 will
hold the D0 state on SDIO until a falling edge of SCK.
To place the SDIO pin into a Hi-Z state, activate the
power-down mode by writing to the configuration
register. Then, the powerdown mode can stay activated,
with the ADNS-2620 in the shutdown state, or the power-
down mode can be deactivated, returning the ADNS-
2620 to normal operation. In both conditions, the SDIO
line will go into the Hi-Z state.
1
Figure 24. SDIO Hi-z state and timing.
Another method to put the SDIO line into the Hi-Z state,
while maintaining the ADNS-2620 at normal mode, is
to write any data to an invalid address such as 0x00 to
address 0x77. The SDIO line will go into the Hi-Z state
after the write operations.
Timing
SDIO
PD
Activated
cycles
clock
PD
32
10 ns, max
Hi-Z