Rainbow Electronics DS2411 User Manual

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DS2411

Silicon Serial Number with VCC Input

FEATURES

§ Unique, Factory-Lasered and Tested 64-Bit

Registration Number (8-Bit Family Code Plus 48-Bit Serial Number Plus 8-Bit CRC Tester); Guaranteed No Two Parts Alike

§ Standby Current <1µA

§ Built-In Multidrop Controller Enables

Multiple DS2411s to Reside on a Common 1-Wire

§ Multidrop Compatible with Other 1-Wire

Products

§ 8-Bit Family Code Identifies Device as

DS2411 to the 1-Wire Master

§ Low-Cost TSOC, SOT23-3, and Flip-Chip

Surface-Mount Packages

§ Directly Connects to a Single-Port Pin of a

Microprocessor and Communicates at up to

15.4kbps

§ Overdrive Mode Boosts Communication

Speed to 125kbps

§ Operating Range: 1.5V to 5.25V, -40°C to

+85°C

Network

PIN CONFIGURATION

SOT23-3, Top View

TSOC, Top View

Flip Chip, Top view, bumps not visible

ORDERING INFORMATION

PART TEMP RANGE PACKAGE

DS2411R/

T&R DS2411P DS2411P/ T&R

DS2411X

-40°C to +85°C

SOT23-3, Tape-and-Reel TSOC

TSOC, Tape-and-Reel Flip Chip, Tape-and-Reel

PIN DESCRIPTION

NAME

SOT23 TSOC

I/O 1 2 A1

26B2

GND 3 1 B1

N.C. — 3 A2 N.C. — 4 —

FLIP

CHIP

N.C. — 5 —

DESCRIPTION

The DS2411 silicon serial number is a low-cost, electronic registration number with external power supply. It provides an absolutely unique identity that can be determined with a minimal electronic interface (typically, a single port pin of a microcontroller). The DS2411’s registration number is a factory-lasered, 64-bit ROM that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit family code (01h). Data is transferred serially through the Dallas Semiconductor’s 1-Wire protocol. The external power supply is required, extending the operating voltage range of the device below typical 1-Wire devices.

1-Wire is a registered trademark of Dallas Semiconductor. 1 of 11 052003

DS2411

ABSOLUTE MAXIMUM RATINGS*

I/O Voltage to GND -0.5V to +6V VCC Voltage to GND -0.5V to +6V I/O, VCC Current ±20mA Operating Temperature Range -40°C to +85°C Junction Temperature +150°C Storage Temperature Range -55°C to +125°C Soldering Temperature See IPC/JEDEC J-STD-

020A Specification

* This is a stress rating only and functional operation of the device at these or any other conditions above

those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

ELECTRICAL CHARACTERISTICS (VCC = 1.5V to 5.25V; TA = -40°C to +85°C.)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Operating Temperature T

Supply Voltage V

(Note 1) -40 +85

(Note 1) 1.5 5.25 V

1-Wire Pullup VCC = V

I/O PIN GENERAL DATA

1-Wire Pullup Resistance R

Power-Up Delay t

PWRP

Input Capacitance C Input Load Current I Standby Supply Current I Active Supply Current I High-to-Low Switching Threshold

Input Low Voltage V

Input High Voltage V

Low-to-High Switching Threshold

Switching Hysteresis V Output Low Voltage at 4mA V

Rising Edge Holdoff t

PUP

CCS

CCA

REH

(Notes 1, 2) 0.3 2.2 V

stable to first

1-Wire command (Notes 1, 3) (Note 3) 100 pF 0V ≤ V(I/O) ≤ V V(I/O) ≤ VIL, or V(I/O) ≥ V

(Notes 3, 4, 5) 0.4 3.2 V

(Note 1) 0.30 V

(Note 1)

(Notes 3, 4, 6) 0.75 3.4 V

(Notes 3, 7) 0.18 V (Note 8) 0.4 V Standard speed (Note 9, 3) 1.25 5 Overdrive speed (Note 9, 3) 0.5 2 Standard speed, R

= 2.2kW (Note 1)

PUP

Recovery Time t

REC

Overdrive speed, R

= 2.2kW (Note 1)

PUP

Overdrive speed, directly prior to reset pulse; R Standard speed 65

SLOT

Overdrive V Overdrive V

(Note 1) 1.5 5.25 V

PUP

1200 µs

-1 +1 µA 1 µA

100 µA

0.3

= 2.2kW (Note 1)

PUP

≥ 2.2V 8Timeslot Duration t

≥ 1.5V 10

°C

µs

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PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

I/O PIN, 1-Wire RESET, PRESENCE DETECT CYCLE

Reset Low Time t

RSTL

Standard speed 480 640 Overdrive speed 60 80 Standard speed 15 60

PDH

Overdrive V Overdrive V

≥ 2.2V 2 6Presence-Detect High Time t

≥ 1.5V 2 8.5

Standard speed 60 240

Presence-Detect Low Time t

Presence-Detect Fall Time t

Presence-Detect Sample Time

PDL

FPD

MSP

Overdrive V Overdrive V

≥ 2.2V 8 24

≥ 1.5V 8 30

Standard speed (Note 10, 3) 0.4 8 Overdrive speed (Note 10, 3) 0.05 1 Standard speed (Note 1) 60 75 Overdrive V Overdrive V

≥ 2.2V (Note 1) 6 10

≥ 1.5V (Note 1) 8.5 10

I/O PIN, 1-Wire WRITE

Standard speed (Notes 1, 13) 60 120

Write-0 Low Time t

W0L

Overdrive V

13) Overdrive V

≥ 2.2V (Notes 1,

≥ 1.5V (Notes 1,

13)

Write-1 Low Time t

W1L

Standard speed (Notes 1, 11, 13) 5 Overdrive speed (Notes 1, 11, 13) 1

I/O PIN, 1-Wire READ

Read Low Time t

Read Sample Time t

MSR

Standard speed (Notes 1, 11) 5 Overdrive speed (Notes 1, 11) 1 Standard speed (Notes 1, 12) Overdrive speed (Notes 1, 12)

616

816

15 - e

2 - e

15 - e

2 - e

+ d

DS2411

µs

Note 1: System requirement. Note 2: Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the

system and 1-Wire recovery times. The specified value here applies to systems with only one device and with the minimum 1-Wire recovery times. For more heavily loaded systems, an active pullup such as that found in the DS2480B may be required. Minimum allowable pullup resistance is slightly greater than the value necessary to produce the absolute maximum current (20mA) during 1-Wire low times at V V

= 0V.

= 5.25V assuming

PUP

Note 3: Not production tested. Note 4: V

and VTH are functions of VCC and temperature.

Note 5: Voltage below which during a falling edge on I/O, a logic ‘0’ is detected. Note 6: Voltage above which during a rising edge on I/O, a logic ‘1’ is detected. Note 7: After V

is crossed during a rising edge on I/O, the voltage on I/O has to drop by VHY to

be detected as logic ‘0’.

Note 8: The I-V characteristic is linear for voltages less than 1V. Note 9: The earliest recognition of a negative edge is possible at t

after VTH has been reached

REH

on the previous edge.

Note 10: Interval during the negative edge on I/O at the beginning of a presence-detect pulse

between the time at which the voltage is 90% of V 10% of V

PUP

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and the time at which the voltage is

PUP

DS2411

(

)

Note 11: e represents the time required for the pullup circuitry to pull the voltage on I/O up VIL to

VTH.

Note 12: d represents the time required for the pullup circuitry to pull the voltage on I/O up from

VIL to the input-high threshold of the bus master.

Note 13: Interval begins when the voltage drops below VTL during a negative edge on I/O and ends

when the voltage rises above V

during a positive edge on I/O.

OPERATION

The DS2411’s registration number is accessed through a single data line. The 48-bit serial number, 8-bit family code, and 8-bit CRC are retrieved using the Dallas 1-Wire protocol. This protocol defines bus transactions in terms of the bus state during specified time slots that are bus-master-generated falling edges on the I/O pin. All data is read and written least significant bit first. The device requires a delay between VCC power-up and initial 1-Wire communication, t

(1200ms). During this time the device

PWRP

may issue presence-detect pulses.

1-Wire BUS SYSTEM

The 1-Wire bus has a single bus master and one or more slaves. In all instances, the DS2411 is a slave device. The bus master is typically either a microcontroller or a Dallas Semiconductor bridge chip such as the DS2480, DS2490, or DS1481. The discussion of this bus system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling (signal type and timing).

Hardware Configuration

The 1-Wire bus has a single data line, I/O. It is important that each device on the bus be able to drive I/O at the appropriate time. To facilitate this, each device has an open-drain or three-state output. The DS2411 has an open-drain output with an internal circuit equivalent to that shown in Figure 3. The bus master can have the same equivalent circuit. If a bidirectional pin is not available on the master, separate output and input pins can be connected together. The bus requires a pullup resistor at the master end of the bus, as shown in Figure 4. A multidrop bus consists of a 1-Wire bus with multiple slaves attached. The 1-Wire bus has a maximum data rate of 15.4kbps in standard speed and 125kbps in overdrive.

The idle state for the 1-Wire bus is high. If a transaction needs to be suspended for any reason, I/O must remain high if the transaction is to be resumed. If the bus is pulled low, slave devices on the bus will interpret the low as either a timeslot, or a reset depending on the duration.

Figure 1. DS2411 REGISTRATION NUMBER

MSB LSB

8-BIT CRC CODE 48-BIT SERIAL NUMBER 8-BIT FAMILY CODE

01h

MSB LSB MSB LSB MSB LSB

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