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DS2480BS Datasheet

  • DS2480BS

  • Serial 1-Wire Line Driver with Load Sensor(409.76 k)

  • 30頁

  • ETC

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DS2480B
Serial 1-Wire
TM
Line
Driver with Load Sensor
www.dalsemi.com
FEATURES
摟
Universal, common-ground serial port to 1-
Wire鈩?line driver for MicroLAN applications
摟
Works with all iButtons and MicroLAN-
compatible 1-Wire slave devices
摟
Communicates at regular and Overdrive 1-
Wire speed and serial port data rates of 9600
(default), 19200, 57600 and 115200 bps
摟
Supports 12V EPROM programming and stiff
5V pullup for crypto iButton, sensors and
EEPROM
摟
Load sensor to terminate the stiff pullup as
the energy demand of the crypto iButton
drops
摟
Self-calibrating time base with
鹵
5%
tolerance for serial and 1-Wire
communication
摟
Slew rate controlled 1-Wire pulldown and
active pullup to accommodate long lines and
reduce radiation
摟
User-selectable RXD/TXD polarity
minimizes component count when interfacing
to 5V based RS232 systems or directly to
UARTs
摟
Programmable 1-Wire timing and driver
characteristics accommodate a wide range of
MicroLAN configurations at regular speed
摟
Smart protocol combines data and control
information without requiring extra pins
摟
Compatible with optical, IR and RF to RS232
converters
摟
Low cost 8-pin SOIC surface mount package
摟
Operates over 4.5V to 5.5V from -40擄C to
+85擄C
PIN ASSIGNMENT
GND
1-W
NC
VDD
1
2
3
4
8
7
6
5
RXD
TXD
POL
VPP
8-Pin SOIC (150-mil)
PIN DESCRIPTION
GND
1-W
NC
VDD
VPP
POL
TXD
RXD
- Ground
- 1-Wire Input/Output
- No Connection
- 4.5 to 5.5 Volts
- Optional EPROM
Programming Voltage
- RXD/TXD Polarity Select
- Serial Data from UART
- Serial Data to UART
ORDERING INFORMATION
DS2480BS
8-pin SOIC
Note:
The DS2480B will replace the DS2480
later in 1999. It is fully backward compatible to
software drivers that accept a 0 as well as a 1 for
bit 2 of the Reset-command response byte (see
page 7, Table 2)
DESCRIPTION
The DS2480B is a serial port to 1-Wire interface chip that supports regular and Overdrive speeds. It con-
nects directly to UARTs and 5V RS232 systems. Interfacing to RS232C (鹵 12V levels) requires a passive
clamping circuit and one 5V to 鹵12V level translator. Internal timers relieve the host of the burden of
generating the time-critical 1-Wire communication waveforms. In contrast to the DS9097(E) where a full
character must be sent by the host for each 1-Wire time slot, the DS2480B can translate each character
1 of 30
101999

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