Datasheet

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DS2482-100
Single-Channel 1-Wire Master
DS2482-100
SDA
SCL
AD1
AD0
PCTLZ
IO
R
P
*
*R
P
= I
2
C PULLUP RESISTOR (SEE THE APPLICATIONS INFORMATION SECTION FOR R
P
SIZING).
V
CC
V
CC
V
CC
CURRENT-LIMITING
RESISTOR
REFER TO APPLICATION
NOTE 4206
1-Wire LINE
1-Wire LINE
1-Wire DEVICE #1
(WITH SPECIAL POWER
REQUIREMENTS)
1-Wire
DEVICE #2
DS2482-100
SDA
SCL
AD0
AD1
PCTLZ
IO
μC
(I
2
C PORT)
Figure 10. Application Schematic
MINIMUM R
P
MAX LOAD AT MIN R
P
FAST MODE
2000
MINIMUM R
P
(Ω)
LOAD (pF)
PULLUP VOLTAGE (V)
1600
1200
800
400
12345
0
500
400
300
200
100
0
Figure 11. I
2
C Fast Mode Pullup Resistor Selection Chart
reduced bus capacitance of 300pF is acceptable for
pullup voltages of 4V and lower. For fast speed operation
at any pullup voltage, the bus capacitance must not
exceed 200pF. The corresponding pullup resistor value
at the voltage is indicated by the “MINIMUM R
P
” line.