DS2484_15 Datasheet, PDF (1/29 Pages) Maxim Integrated Products – Single-Channel 1-Wire Master with Adjustable Timing and Sleep Mode

DS2484
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
General Description
The DS2484 is an I²C-to-1-Wire^M bridge device that
interfaces directly to standard (100kHz max) or fast
(400kHz max) I²C masters to perform protocol con-
version between the I²C master and any downstream
1-Wire slave devices. Relative to any attached 1-Wire
slave device, the DS2484 is a 1-Wire master. Internal,
user-adjustable timers relieve the system host processor
from generating time-critical 1-Wire waveforms, support-
ing both standard and overdrive 1-Wire communication
speeds. In addition, the 1-Wire bus can be powered
down under software control. The dual-voltage operation
allows different operating voltages on the I²C and 1-Wire
side. Strong pullup features support 1-Wire power deliv-
ery to 1-Wire devices such as EEPROMs and sensors.
When not in use, the DS2484 can be put in sleep mode
where power consumption is minimal.
Applications
Printers
Medical Instruments
Industrial Sensors
Cell Phones
Benefits and Features
S I²C Host Interface Supports 100kHz and 400kHz
I²C Communication Speeds
S Standard and Overdrive 1-Wire Communication
Speeds
S Adjustable 1-Wire Timing for t_RSTL, t_MSP, t_W0L,
and t_REC0
S 1-Wire Port Can Be Powered Down Under
Software Control
S Supports Power-Saving Sleep Mode (SLPZ Pin),
Where the 1-Wire Port is in High Impedance
S I²C Operating Voltages: 1.8V ±5%, 3.3V ±10%, and
5.0V +5/-10%
S Built-In Level Translator: 1-Wire Operating Voltage
from 1.8V -5% to 5.0V +5%, Independent of I²C
Voltage
S Built-In ESD Protection Level of ±8kV Human
Body Model (HBM) Contact Discharge on IO Pin
S -40NC to +85NC Operating Temperature Range
S 8-Pin TDFN and 6-Pin SOT23 Packages
Ordering Information appears at end of data sheet.
Typical Application Circuit
3V
(I²C PORT)
µC
5V
RP*
VCC
SDA
SCL
DS2484
SLPZ
1-Wire BUS
IO
1-Wire
DEVICE #1
1-Wire
DEVICE #2
1-Wire
DEVICE #n
*RP = I²C PULLUP RESISTOR (SEE THE Pullup Resistor RP Sizing SECTION FOR RP SIZING)
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6701; Rev 1; 7/15