DS2482X-101-U View Datasheet(PDF) - Maxim Integrated
Part Name
Description
View to exact match
DS2482X-101-U Datasheet PDF : 24 Pages
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Single-Channel 1-Wire Master with Sleep Mode
1-Wire Triplet
Command Code
Command Parameter
Description
78h
Direction Byte
Generates three time slots: two read time slots and one write time slot at the 1-Wire line. The type
of write time slot depends on the result of the read time slots and the direction byte. The direction
byte determines the type of write time slot if both read time slots are 0 (a typical case). In this
case, the DS2482-101 generates a write-one time slot if V = 1 and a write-zero time slot if V = 0.
See Table 3.
If the read time slots are 0 and 1, they are followed by a write-zero time slot.
If the read time slots are 1 and 0, they are followed by a write-one time slot.
If the read time slots are both 1 (error case), the subsequent write time slot is a write-one.
Typical Use
Restriction
Error Response
To perform a 1-Wire Search ROM sequence; a full sequence requires this command to be
executed 64 times to identify and address one device.
1-Wire activity must have ended before the DS2482-101 can process this command.
Command code and direction byte is not acknowledged if 1WB = 1 at the time the command
code is received and the command is ignored.
Command Duration
1-Wire Activity
Read Pointer Position
Status Bits Affected
Configuration Bits Affected
3 x tSLOT + maximum 262.5ns, counted from the falling SCL edge of the first bit (MSB) of the
direction byte.
Begins maximum 262.5ns after the falling SCL edge of the MSB of the direction byte.
Status Register (for busy polling).
1WB (set to 1 for 3 x tSLOT), SBR is updated at the first tMSR, TSB and DIR are updated at the
second tMSR (i.e., at tSLOT + tMSR).
1WS, APU apply.
Table 3. Bit Allocation in the Direction Byte
BIT 7
V
x = Don’t care.
BIT 6
x
BIT 5
x
BIT 4
x
BIT 3
x
BIT 2
x
BIT 1
x
BIT 0
x
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