Datasheet

10 SERDESUB-21USB User’s Guide SNLU101 – April 2012
Table 1. ID[x] Resistor Value – DS90UB903Q Slave Address
Rid Resistor Ω Address 7'b
Address 8'b
0 appended (WRITE)
0 7b' 101 1000 (h'58) 8b' 1011 0000 (h'B0)
2.0K 7b' 101 1001 (h'59) 8b' 1011 0010 (h'B2)
4.7K 7b' 101 1010 (h'5A) 8b' 1011 0100 (h'B4)
8.2K 7b' 101 1011 (h'5B) 8b' 1011 0110 (h'B6)
12.1K 7b' 101 1100 (h'5C) 8b' 1011 1000 (h'B8)
39.0K 7b' 101 1110 (h'5E) 8b' 1011 1100 (h'BC)
Serializer Bidirectional Control Bus (SCL, SDA) – I
2
C Compliant
Reference Description Settings Connector
J4
I
2
C Port
Pinout:
1 – VDD_I2C
2 – SCL
3 – SDA
4 – VSS
JP9
I
2
C Input
Port
Closed:
VDD_I2C power is
applied through the
VDDIO source with
onboard 1.0Kohm
pull up resistors
(Default)
Open:
VDD_I2C power is
applied externally
Note: when
connecting the bus
externally, the
target source must
have external pull
up resistor.