DS2482-101 1-Wire Master Datasheet

DS2482-101 Datasheet, PDF, Equivalent


Part Number

DS2482-101

Description

Single-Channel 1-Wire Master

Manufacture

Maxim Integrated

Total Page 24 Pages
Datasheet
Download DS2482-101 Datasheet


DS2482-101
DS2482-101
Single-Channel 1-Wire Master
with Sleep Mode
General Description
The DS2482-101 is an I2C-to-1-Wire® bridge device
that interfaces directly to standard (100kHz max) or fast
(400kHz max) I2C masters to perform bidirectional pro-
tocol conversion between the I2C master and any
downstream 1-Wire slave devices. Relative to any
attached 1-Wire slave device, the DS2482-101 is a
1-Wire master. Internal, factory-trimmed timers relieve
the system host processor from generating time-critical
1-Wire waveforms, supporting both standard and over-
drive 1-Wire communication speeds. To optimize
1-Wire waveform generation, the DS2482-101 performs
slew-rate control on rising and falling 1-Wire edges and
provides additional programmable features to match
drive characteristics to the 1-Wire slave environment.
Programmable, strong pullup features support 1-Wire
power delivery to 1-Wire devices such as EEPROMs
and sensors. The DS2482-101 combines these features
with an output to control an external MOSFET for
enhanced strong pullup application. The I2C slave
address assignment is controlled by one binary
address input, resolving potential conflicts with other
I2C slave devices in the system. When not in use, the
device can be put in sleep mode where power con-
sumption is minimal.
Applications
Printers
Medical Instruments
Industrial Sensors
Cell Phones, PDAs
Typical Operating Circuit
Benefits and Features
Allows Easy Interface Between a I2C Microport and a
1-Wire Slave
I2C Host Interface Supports 100kHz and 400kHz
I2C Communication Speeds
1-Wire Master IO with Selectable Active or Passive
1-Wire Pullup
Provides Reset/Presence, 8-Bit, Single-Bit,
and 3-Bit 1-Wire IO Sequences
Standard and Overdrive 1-Wire Communication
Speeds
One Address Inputs for I2C Address Assignment
Minimizes Line Noise Reducing System EMI
Slew-Controlled 1-Wire Edges
Supports EEPROMs, Temperature Sensors, or other
1-Wire Slaves That Have Momentary High Source
Current Modes
Strong 1-Wire Pullup Provided by an Internal
Low-Impedance Signal Path
PCTLZ Output to Optionally Control an External
MOSFET for Stronger Pullup Requirements
Reduce Power Consumption Saves on Power
Supply Cost
Supports Power-Saving Sleep Mode
Operating Range: 2.9V to 5.5V, -40°C to +85°C
9-Bump WLP Package
Pin Configurations and Ordering Information appear at
end of data sheet.
VCC
(I2C PORT)
μC
RP*
SDA
SCL
PCTLZ
DS2482-101
SLPZ IO
AD0
OPTIONAL
CIRCUITRY
BSS84
1-Wire LINE
1-Wire
DEVICE
1-Wire
DEVICE
1-Wire
DEVICE
*RP = I2C PULLUP RESISTOR (SEE THE APPLICATIONS INFORMATION SECTION FOR RP SIZING).
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
19-4931; Rev 5; 1/15

DS2482-101
DS2482-101
Single-Channel 1-Wire Master with
Sleep Mode
Absolute Maximum Ratings
Voltage Range on Any Pin Relative to Ground.........-0.5V to +6V
Maximum Current into Any Pin..........................................±20mA
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VCC = 2.9V to 5.5V, TA = -40°C to +85°C.)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
3.3V
VCC 5V
Supply Current
1-Wire Input High (Notes 2, 3)
1-Wire Input Low (Notes 2, 3)
1-Wire Weak Pullup Resistor
1-Wire Output Low
Active Pullup On Time
(Notes 4, 5)
Strong Pullup Voltage Drop
Pulldown Slew Rate (Note 6)
Pullup Slew Rate (Note 6)
Power-On Reset Trip Point
ICC
VIH1
VIL1
RWPU
VOL1
tAPUOT
VSTRPU
PDSRC
PUSRC
VPOR
(Note 1)
Sleep mode (SLPZ low), VCC = 5.5V
3.3V
5V
3.3V
5V
(Note 4)
At 4mA load
Standard
Overdrive
VCC  3.2V, 1.5mA load
VCC  5.2V, 3mA load
Standard (3.3V ±10%)
Overdrive (3.3V ±10%)
Standard (5.0V ±10%)
Overdrive (5.0V ±10%)
Standard (3.3V ±10%)
Overdrive (3.3V ±10%)
Standard (5.0V ±10%)
Overdrive (5.0V ±10%)
1-Wire TIMING (Note 5) (See Figures 4, 5, and 6)
Write-One/Read Low Time
Standard
tW1L
Overdrive
Read Sample Time
tMSR
Standard
Overdrive
1-Wire Time Slot
tSLOT
Standard
Overdrive
Standard (3.3V to 0V)
Fall Time High-to-Low
(Notes 6, 7)
tF1
Overdrive (3.3V to 0V)
Standard (5.0V to 0V)
Overdrive (5.0V to 0V)
MIN
2.9
4.5
1.9
3.4
1000
2.3
0.4
1
5
2
10
0.8
2.7
1.3
3.4
TYP
3.3
5.0
0.5
2.5
0.5
MAX
3.7
5.5
750
1.0
0.9
1.2
1675
0.4
2.7
0.6
0.3
0.5
4.2
22.1
6.5
40
4
20
6
31
2.2
UNITS
V
μA
V
V

V
μs
V
V/μs
V/μs
V
7.6
0.9
13.3
1.4
65.8
9.9
0.54
0.10
0.55
0.09
8
1
14
1.5
69.3
10.5
8.4
1.1
15
1.8
72.8
11.0
3.0
0.59
2.2
0.44
μs
μs
μs
μs
www.maximintegrated.com
Maxim Integrated | 2


Features DS2482-101 Single-Channel 1-Wire Master with Sleep Mode General Description T he DS2482-101 is an I2C-to-1-Wire® bri dge device that interfaces directly to standard (100kHz max) or fast (400kHz m ax) I2C masters to perform bidirectiona l protocol conversion between the I2C m aster and any downstream 1-Wire slave d evices. Relative to any attached 1-Wire slave device, the DS2482-101 is a 1-Wi re master. Internal, factory-trimmed ti mers relieve the system host processor from generating time-critical 1-Wire wa veforms, supporting both standard and o verdrive 1-Wire communication speeds. T o optimize 1-Wire waveform generation, the DS2482-101 performs slew-rate contr ol on rising and falling 1-Wire edges a nd provides additional programmable fea tures to match drive characteristics to the 1-Wire slave environment. Programm able, strong pullup features support 1- Wire power delivery to 1-Wire devices s uch as EEPROMs and sensors. The DS2482- 101 combines these features with an output to control an externa.
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