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PDF DS2409 Data sheet ( Hoja de datos )
| Número de pieza | DS2409 | |
| Descripción | MicroLAN Coupler | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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FEATURES
§ Low impedance coupler to create large
common-ground, multi-level MicroLAN
networks
§ Keeps inactive branches pulled high to 5V
§ Simplifies network topology analysis by
logically decoupling devices on active
network segments
§ Conditional search for fast-event signaling
§ Auxiliary 1-Wire® line to connect a memory
chip or to be used as digital input
§ Programmable, general-purpose open-drain
control output
§ Communicates at 16.3kbits per second
§ Unique, factory-lasered and tested 64-bit
registration number (8-bit family code + 48-
bit serial number + 8-bit CRC tester) assures
absolute traceability because no two parts are
alike
§ 8-bit family code specifies device
communication requirements to bus master
§ Built-in multidrop controller ensures
compatibility with other MicroLAN products
§ Operating temperature range from -40°C to
+85°C
§ Compact, low-cost 6-pin TSOC surface
mount package
DS2409
MicroLAN Coupler
PIN ASSIGNMENT
16
25
34
TOP VIEW
3.7mm X 4.0mm X 1.5 mm
SIDE VIEW
6-PIN TSOC PACKAGE
PIN DESCRIPTION
Pin 1
GND
Pin 2
1-Wire in
Pin 3
Main 1-Wire out
Pin 4
Auxiliary 1-Wire out
Pin 5
Control Output
Pin 6
VDD
ORDERING INFORMATION
DS2409P
6-pin TSOC package
DS2409P/T&R
Tape and Reel of DS2409P
DESCRIPTION
The MicroLAN coupler is an essential component to build and control 1-Wire MicroLAN networks with
multi-level branching. In contrast to approaches that switch the ground line, the coupler maintains a
common ground level for the whole network and keeps the inactive segments powered. This simplifies
supplying central or local power for additional circuitry and prevents loss of status of parasitically
powered devices. It also avoids disrupting communication caused by the parasitic power supply of 1-Wire
devices after activating a branch. The coupler does not contain any user-programmable memory. To label
a branch, one can connect any 1-Wire memory device to the auxiliary 1-Wire output of the coupler. Both
the main and the auxiliary 1-Wire output are supported by a “smart-on” command. This command
generates a reset/presence sequence on the selected output before the electronic switch closes the contact
to the 1-Wire bus. This way the bus master can apply a ROM function command (optionally followed by
a memory function) to the devices on the just activated segment with all other devices in the network
1 of 18
061907
1 page  
STATUS CONTROL BYTE Table 1
7654
DATA
X
CNTR.
SEL.
MODE
R/ W
3
R/ W
2
X
DS2409
10
XX
0-2 X don’t care
3-4 R/ W Write control: both bits must be 0 to change the status.
5 MODE control output mode selection: 0 = auto-control mode (default), 1 = manual mode
6
CNTR.
SEL.
control output association (auto-control mode): 0 = main (default), 1 = auxiliary
7
DATA
X
Value to be written to control output (manual mode only): don’t care otherwise
STATUS INFO BYTE Table 2
765
MODE
CNTR.
STAT
EVNT
AUX.
4
EVNT
MAIN
3
AUX.
LEVL
2
AUX.
STAT
1
MAIN
LEVL
0
MAIN
STAT
0
MAIN
STAT
status of main output: 0 = active (connected to bus master), 1 = inactive
1
MAIN
LEVL
voltage sensed at main output: 0 = low, 1 = high (see note)
2
AUX.
STAT
status of auxiliary output: 0 = active (connected to bus master), 1 = inactive
3
AUX.
LEVL
voltage sensed at auxiliary output: 0 = low, 1 = high (see note)
4
EVNT
MAIN
event flag for main output: 0 = no event, 1 = negative edge sensed since inactive
5
EVNT
AUX.
event flag for aux. Output: 0 = no event, 1 = negative edge sensed since inactive
6
CNTR. if auto-control mode: control output association, 0 = main, 1 = auxiliary
STAT if manual mode: 0 = output transistor off, 1 = output transistor on
7 MODE control output mode: 0 = auto-control mode, 1 = manual mode
NOTE:
Data is valid only if the output is decoupled from the 1-Wire input.
ALL LINES OFF [66h]
This command is used to deactivate the currently active 1-Wire output and to clear both event flags or to
end a discharge cycle initiated by the Discharge Lines command. Before issuing this command, one
should read the status and check the event flags of both, the main and the auxiliary output. Otherwise one
might inadvertently clear the event flag without having taken appropriate action. If the DS2409 is in auto-
control mode, the transistor at the control output will be switched off (non-conducting). At power-on, the
device will automatically perform the All Lines Off command. In contrast to a power-on cycle, the All
Lines Off command does not clear the Mode and Control Select bits.
5 of 18
5 Page 
ROM FUNCTIONS FLOW CHART Figure 7
DS2409
11 of 18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet DS2409.PDF ] | |
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