SERDESUB-16USB/NOPB National Semiconductor, SERDESUB-16USB/NOPB Datasheet - Page 29

• Manufacturer Part Number: SERDESUB-16USB/NOPB
• Description: EVAL BOARD FOR DS90UB901/2
• Manufacturer: National Semiconductor
• Series: -r

Specifications of SERDESUB-16USB/NOPB

• Main Purpose: Interface, Serializer, Deserializer (SERDES)
• Embedded: No
• Utilized Ic / Part: DS90UB901Q
• Primary Attributes: Bidirectional Control with I2C Support
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

SLAVE CLOCK STRETCHING
In order to communicate and synchronize with remote de-
vices on the I
slave clock stretching must be supported by the I
controller/MCU. The chipset utilizes bus clock stretching
(holding the SCL line low) during data transmission; where
the I
every I
device will not control the clock and only stretches it until the
remote peripheral has responded; which is typically in the or-
der of 12 us (typical).
2
C slave pulls the SCL line low prior to the 9th clock of
2
C data transfer (before the ACK signal). The slave
2
C bus through the bidirectional control channel,
FIGURE 25. START and STOP Conditions
FIGURE 24. Basic Operation
2
C master
FIGURE 23. Read Byte
29
ID[X] ADDRESS DECODER
The ID[x] pin is used to decode and set the physical slave
address of the Serializer/Deserializer (I
six devices on the bus using only a single pin. The pin sets
one of six possible addresses for each Serializer/Deserializer
device. The pin must be pulled to VDD (1.8V, NOT VDDIO))
with a 10 kΩ resistor and a pull down resistor (RID) of the
recommended value to set the physical device address. The
recommended maximum resistor tolerance is 0.1% worst
case (0.2% total tolerance).
30113542
2
C only) to allow up to
www.national.com
30113510
30113541