DS2422 Maxim, DS2422 Datasheet - Page 35
DS2422
Manufacturer Part Number
DS2422
Description
The DS2422 temperature/data logger combines the core functions of a fully featured data logger in a single chip
Manufacturer
Maxim
Datasheet
1.DS2422.pdf
(49 pages)
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bus performs a reset. The DS2422 will communicate properly when used in conjunction with a DS2480B or
DS2490 1-Wire driver and adapters that are based on these driver chips.
Figure 13. Hardware Configuration
TRANSACTION SEQUENCE
The protocol for accessing the DS2422 through the 1-Wire port is as follows:
INITIALIZATION
All transactions on the 1-Wire bus begin with an initialization sequence. The initialization sequence consists of a
reset pulse transmitted by the bus master followed by presence pulse(s) transmitted by the slave(s). The presence
pulse lets the bus master know that the DS2422 is on the bus and is ready to operate. For more details, see the
1-Wire Signaling section.
Initialization
ROM Function Command
Memory/Control Function Command
Transaction/Data
RX
TX
BUS MASTER
Open Drain
Port Pin
V
PUP
R
RX = RECEIVE
TX = TRANSMIT
PUP
35 of 49
5 µA
Typ.
DATA
DS2422 1-Wire PORT
100
MOSFET
RX
TX
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