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PDF DS2480 Data sheet ( Hoja de datos )
| Número de pieza | DS2480 | |
| Descripción | Serial 1-Wire Line Driver | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS2480 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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FEATURES
Universal, common-ground serial port to
1-WireTM line driver for MicroLANTM
applications
Works with all iButtons™ and MicroLAN-
compatible 1-Wire slave devices
Communicates at regular and Overdrive 1-Wire
speed and serial port data rates of 9600
(default), 19200, 57600 and 115200 bps
Supports 12V EPROM programming and stiff
5V pull-up for Crypto iButton, sensors and
EEPROM
Self-calibrating time base with ±5% tolerance
for serial and 1-Wire communication
Slew rate controlled 1-Wire pull-down and
active pull-up to accommodate long lines and
reduce radiation
User-selectable RXD/TXD polarity minimizes
component count when interfacing to 5V
based RS232 systems or directly to UARTs
Programmable 1-Wire timing and driver
characteristics accommodate a wide range of
MicroLAN configurations at regular speed
Smart protocol combines data and control
information without requiring extra pins
Compatible to optical, IR and RF to RS232
converters
Low cost 8-pin SOIC surface mount package
Operates over 4.5V to 5.5V from -40°C to
+85°C
DS2480
Serial 1-Wire™ Line Driver
PIN ASSIGNMENT
GND
1-W
NC
VDD
1 8 RXD
2 7 TXD
3 6 POL
4 5 VPP
8-PIN SOIC
(150 MIL)
PIN DESCRIPTION
GND
Ground
1-W 1-Wire Input/Output
NC No Connection
VDD 4.5 to 5.5V
VPP Optional EPROM
Programming Voltage
POL RXD/TXD Polarity Select
TXD
Serial Data from UART
RXD
Serial Data to UART
ORDERING INFORMATION
DS2480S
8-pin SOIC
1 of 33
012501
1 page  
STATE TRANSITION DIAGRAM Figure 2
DS2480
SOFTWARE
MASTER RESET
INACTIVE
POWER OFF
POWER
ON
ARRIVAL
COMMAND MODE
TX
ARRIVAL
CODE
N.C.
110XSS01
RESET
N.C.
111T11Q1
N.C.
PULSE
N.C.
0ZZZVVV1
CONFIGURATION
101HSS01
100VSSP1
N.C.
SEARCH
ACCEL.
N.C.
SINGLE BIT
FUNCTION
110XSS01
E1h
111T11Q1
0ZZZVVV1
CHECK
MODE
E3h
101HSS01
100VSSP1
POWER OFF
TX E3h
N.C.
CODE = E3h
ACC. OFF
TX BYTE
STR. PULL-UP
ARMED
DATA MODE
ALL OTHER
CODES
CHECK SEARCH
ACCELERATOR
ACC.ON
N.C.
PERFORM SEARCH
SEQUENCE
GENERATE STRONG
PULL-UP TO 5V
N.C.
N.C. = UNCONDITIONAL
STR. PULL-UP NOT
LEGEND:
V BINARY VALUE (TYPE OF WRITE TIME SLOT)
SS 1-WIRE SPEED SELECTION CODE
P IF LOGIC 1, GENERATES STRONG PULL-UP TO 5V IMMEDIATELY FOLLOWING THE TIME SLOT
T TYPE OF PULSE; 0 = STRONG PULL-UP (5V), 1 = PROGRAMMING PULSE (12V)
Q 1 = ARM STRONG PULL-UP AFTER EVERY BYTE; 0 = DISARM
H SEARCH ACCELERATOR CONTROL; 1 = ACCELERATOR ON, 0 = ACCELERATOR OFF
ZZZ CONFIGURATION PARAMETER CODE (WRITE), 000 = READ CONFIGURATION PARAMETER
VVV CONFIGURATION PARAMETER VALUE CODE (WRITE), CONFIGURATION PARAMETER CODE (READ)
X DON'T CARE
After the DS2480 has reached the command mode, the host can send commands such as 1-Wire Reset,
Pulse, Configuration, Search Accelerator and Single Bit functions or switch over to the second static state
called Data Mode. In data mode the DS2480 simply converts bytes it receives at the TXD pin into their
equivalent 1-Wire wave forms and reports the results back to the host through the RXD pin. If the Search
Accelerator is on, each byte seen at TXD will generate a 12-bit sequence on the 1-Wire bus (see section
Search Accelerator for details). If the Strong Pull-up to 5-volts is enabled (see Pulse command) each byte
on the 1-Wire bus will be followed by a pause of predefined duration where the bus is pulled to 5-volts
via a low impedance transistor in the 1-Wire driver circuit.
5 of 28
5 Page 
SEARCH ACCELERATOR USAGE EXAMPLE
Action Sequence
Host TX
Generate Reset Pulse
C1
Set Data Mode
E1
Search ROM command
F0
Set Command Mode
E3
Search Accelerator On
B1
Set Data Mode
E1
Send 16 bytes
data
Set Command Mode
E3
Search Accelerator Off
A1
Set Data Mode
E1
Do Memory Function
Set Command Mode
E3
Generate Reset Pulse
C1
Host RX
C9
(nothing)
(as sent)
(nothing)
(nothing)
(nothing)
response
(nothing)
(nothing)
(nothing)
(nothing)
C9
DS2480
CONFIGURATION COMMANDS
The DS2480 is designed to be configurable for the varying requirements of its application. When the
device powers up and/or performs a master reset cycle, the hard-wired default configuration settings take
effect. These settings will work on a short 1-Wire bus and assume regular 1-Wire communication speed.
To change these default settings and to verify the current settings, the logic of the DS2480 supports
configuration commands. A summary of the available configuration parameters, their default settings at
regular and Overdrive speed and their applicability is shown in Table 3.
Parameters not related to the communication speed on the 1-Wire bus specify the duration of the 12-volts
programming pulse, the duration of the strong pull-up to 5-volts and the baud rate on the interface that
connects the DS2480 to the host. The remaining three parameters are used to modify the 1-Wire
communication wave forms if one selects “Flexible Speed” (see “Communication Commands” for speed
selection).
Flexible speed is implemented to improve the performance of large MicroLAN Networks. This is
accomplished by:
• limiting the slew rate on falling edges (e. g., at the beginning of time slots, to reduce ringing),
• extending the Write 1 low time (allows the current flow through the network to end slowly, to
prevent voltage spikes from inductive kickback),
• delaying the time point when reading a bit from the 1-Wire bus (gives the network more time to
stabilize, to get a higher voltage margin) and
• adding extra recovery time between Write 0 time slots (allows more energy transfer through the
network, to replenish the parasite power supply of the devices on the bus).
The latter two functions are controlled by a single parameter. Taking advantage of flexible speed requires
changing one or more of these parameters from their default values. Otherwise the waveforms will be
identical to those at regular speed.
Each configuration parameter is identified by its 3-bit parameter code and can be programmed for one of
a maximum 8 different values using a 3-bit value code. A matrix of parameter codes and value codes with
the associated physical values in shown in Table 4.
11 of 28
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet DS2480.PDF ] | |
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