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PDF DS2408 Data sheet ( Hoja de datos )
| Número de pieza | DS2408 | |
| Descripción | 1-Wire 8-Channel Addressable Switch | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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DS2408
1-Wire 8-Channel Addressable Switch
BENEFITS AND FEATURES
Control Eight Independent I/O Port Pins from a Single
Micro Port Pin
o Eight Channels of Programmable I/O with
Open-Drain Outputs
o On-Resistance of PIO Pulldown Transistor 100Ω
(max); Off-Resistance 10MΩ (typ)
o Individual Activity Latches Capture
Asynchronous State Changes at PIO Inputs for
Interrogation by the Bus Master
o Data-Strobe Output to Synchronize PIO Logic
States to External Read/Write Circuitry
Minimalist 1-Wire Interface Lowers Cost and
Interface Complexity
o Built-in Multidrop Controller Ensures
Compatibility with Other 1-Wire® Net Products
o Supports 1-Wire Conditional Search Command
with Response Controlled by Programmable PIO
Conditions
o Unique Factory-Lasered 64-Bit Registration
Number Ensures Error-Free Device Selection and
Absolute Part Identity
o Communicates to Host with a Single Digital
Signal at 15.3kbps or 100kbps
Wide Voltage and Temperature Operating Ranges
Enables Robust System Performance
o 2.8V to 5.25V
o -40°C to +85°C Industrial Temperature Range
PIN CONFIGURATION
150-mil SO
ORDERING INFORMATION
PART
TEMP RANGE
DS2408S+
-40°C to +85°C
DS2408S+T&R -40°C to +85°C
+Denotes a lead(Pb)-free package.
T&R = Tape and reel.
PIN-PACKAGE
16 SO
16 SO
DESCRIPTION
The DS2408 is an 8-channel, programmable I/O 1-Wire chip. PIO outputs are configured as open-drain and
provide an on resistance of 100Ω max. A robust PIO channel-access communication protocol ensures that PIO
output-setting changes occur error-free. A data-valid strobe output can be used to latch PIO logic states into
external circuitry such as a D/A converter (DAC) or microcontroller data bus.
DS2408 operation is controlled over the single-conductor 1-Wire bus. Device communication follows the
standard Dallas Semiconductor 1-Wire protocol. Each DS2408 has its own unalterable and unique 64-bit
ROM registration number that is factory lasered into the chip. The registration number guarantees unique
identification and is used to address the device in a multidrop 1-Wire net environment. Multiple DS2408
devices can reside on a common 1-Wire bus and can operate independently of each other. The DS2408 also
supports 1-Wire conditional search capability based on PIO conditions or power-on-reset activity; the
conditions to cause participation in the conditional search are programmable. The DS2408 has an optional VCC
supply connection. When an external supply is absent, device power is supplied parasitically from the 1-Wire
bus. When an external supply is present, PIO states are maintained in the absence of the 1-Wire bus power
source. The RSTZ signal is configurable to serve as either a hard-wired reset for the PIO output or as a strobe
for external circuitry to indicate that a PIO write or PIO read has completed.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
1 of 39
19-5702; 3/15
1 page  
DS2408
STANDARD VALUES
DS2408 VALUES
PARAMETER STANDARD
OVERDRIVE
STANDARD
OVERDRIVE
NAME
SPEED
SPEED
SPEED
SPEED
MIN MAX MIN MAX MIN MAX MIN MAX
tSLOT (incl. tREC) 61µs (undef.) 7µs (undef.) 65µs 1) (undef.) 10µs (undef.)
tRSTL
480µs (undef.) 48µs 80µs 660µs 720µs 53µs 80µs
tPDH
15µs 60µs
2µs
6µs 15µs 60µs 2µs
7µs
tPDL
60µs 240µs 8µs
24µs 60µs 280µs 7µs
27µs
tW0L
60µs 120µs 6µs
16µs 60µs 120µs 8µs
13µs
tSLS, tSPD
15µs 60µs
2µs
6µs 15µs 60µs 1.8µs
1) Intentional change, longer recovery-time requirement due to modified 1-Wire front end.
8µs
PIN DESCRIPTION
PIN NAME
1 N.C.
2 P0
3 VCC
4 I/O
5 GND
6 N.C.
7 P7
8 P6
9 P5
10 RSTZ
11 P4
12 P3
13 P2
14 P1
15 N.C.
16 N.C.
DESCRIPTION
Not Connected
I/O Pin of Channel 0. Logic input/open-drain output with 100Ω maximum
on-resistance; 0V to 5.25V operating range. Power-on default is
indeterminate. If it is application-critical for the outputs to power up in the
"off" state, the user should attach an appropriate power-on-reset circuit or
supervisor IC to the RSTZ pin.
Optional Power Supply Input. Range 2.8V to 5.25V; must be tied to GND
if not used.
1-Wire Interface. Open-drain, requires external pullup resistor.
Ground
Not Connected
I/O Pin of Channel 7. Same characteristics as P0.
I/O Pin of Channel 6. Same characteristics as P0.
I/O Pin of Channel 5. Same characteristics as P0.
SW configurable PIO reset input ( RST ) or open-drain strobe output
( STRB ). When configured as RST , a LOW input sets all PIO outputs to
the "off" state by setting all bits in the PIO Output Latch State Register.
When configured as STRB , an output strobe will occur after a PIO write
(see Channel-Access Write command) or after a PIO Read (see Channel-
Access Read command). The power-on default function of this pin is
RST .
I/O pin of channel 4; same characteristics as P0
I/O pin of channel 3; same characteristics as P0
I/O pin of channel 2; same characteristics as P0
I/O pin of channel 1; same characteristics as P0
Not connected
Not connected
5 of 39
5 Page 
DS2408
Conditional Search Channel Polarity Selection Register
The data in this register specifies the polarity of each selected PIO channel for the device to respond to
the conditional search command. Within a PIO channel, the data source may be either the channel's input
signal (pin) or the channel's activity latch, as specified by the PLS bit in the Control/Status register at ad-
dress 008Dh. This register can only be written through the Write Conditional Search Registers command.
Conditional Search Channel Polarity Selection Register Bitmap
ADDR b7 b6 b5 b4 b3 b2 b1 b0
008Ch SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
This register is read/write. Each bit is associated with the respective PIO channel as shown in Figure 7.
This register is cleared to 00h by a power-on reset.
Figure 7. Conditional Search Logic
PLS CHANNEL 0 SP0
SM0
CT
AL0
P0
CHANNEL 7
INPUT FROM
CHANNELS 1 TO 6
(NOT SHOWN)
SP7 SM7
CSR
AL7
P7
11 of 39
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS2408.PDF ] | |
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