DS2405 Datasheet, PDF (1/15 Pages) Dallas Semiconductor – Addressable Switch

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FEATURES
§ Open drain PIO pin is controlled by
matching 64-bit, laser-engraved registration
number associated with each device
§ Logic level of open drain output can be
determined over 1-Wire bus for closed-loop
control
§ PIO pin sink capability is greater than 4 mA
at 0.4V
§ Multiple DS2405’s can be identified on a
common 1-Wire bus and be turned on or off
independent of other devices on the bus
§ Unique, factory-lasered and tested 64-bit
registration number (8-bit family code +48-
bit serial number +8-bit CRC tester) assures
absolute identity because no two parts are
alike
§ Built-in multidrop controller ensures
compatibility with other MicroLAN products
§ Reduces control, address, data, and power to
a single data pin
§ Directly connects to a single port pin of a
microprocessor and communicates at up to
16.3 kbits/s
§ 8-bit family code specifies DS2405
communications requirements to reader
§ 8-bit cyclic redundancy check ensures error-
free selection
§ Zero standby power required
§ Low cost TO-92, SOT-223, or 6-pin TSOC
surface mount package
§ 1-Wire communication operates over a wide
voltage range of 2.8V to 6.0V from -40°C to
+85°C
DS2405
Addressable Switch
PIN ASSIGNMENT
TO-92
DS2405
TSOC PACKAGE
GND
NC
DATA
NC
PIO
NC
TOP VIEW
3.7 X 4.0 X 1.5
123
123
BOTTOM VIEW
See Mech.
Drawings Section
TOP VIEW
PIN DESCRIPTION TSOC
Pin 1 - Ground
Pin 1 - Ground
Pin 2 - Data
Pin 2 - Data
Pin 3 - PIO
Pin 3 - PIO
Pin 4 - Ground
Pin 4-6 -No Connect
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