DS2484 Single-Channel 1-Wire Master with Adjustable Timing and Sleep Mode General Description Benefits and Features 2 M 2 The DS2484 is an I C-to-1-Wire bridge device that S I C Host Interface Supports 100kHz and 400kHz 2 interfaces directly to standard (100kHz max) or fast I C Communication Speeds 2 (400kHz max) I C masters to perform protocol con- S Standard and Overdrive 1-Wire Communication 2 version between the I C master and any downstream Speeds 1-Wire slave devices. Relative to any attached 1-Wire S Adjustable 1-Wire Timing for t , t , t , RSTL MSP W0L slave device, the DS2484 is a 1-Wire master. Internal, and t REC0 user-adjustable timers relieve the system host processor from generating time-critical 1-Wire waveforms, support- S 1-Wire Port Can Be Powered Down Under Software Control ing both standard and overdrive 1-Wire communication speeds. In addition, the 1-Wire bus can be powered S Supports Power-Saving Sleep Mode (SLPZ Pin), down under software control. The dual-voltage operation Where the 1-Wire Port is in High Impedance 2 allows different operating voltages on the I C and 1-Wire 2 S I C Operating Voltages: 1.8V 5%, 3.3V 10%, and side. Strong pullup features support 1-Wire power deliv- 5.0V +5/-10% ery to 1-Wire devices such as EEPROMs and sensors. S Built-In Level Translator: 1-Wire Operating Voltage When not in use, the DS2484 can be put in sleep mode 2 from 1.8V -5% to 5.0V +5%, Independent of I C where power consumption is minimal. Voltage Applications S Built-In ESD Protection Level of 8kV Human Body Model (HBM) Contact Discharge on IO Pin Printers S -40NC to +85NC Operating Temperature Range Medical Instruments S 8-Pin TDFN and 6-Pin SOT23 Packages Industrial Sensors Cell Phones Ordering Information appears at end of data sheet. Typical Application Circuit 3V 5V R * P V CC SDA 2 (I C PORT) SCL DS2484 C 1-Wire BUS SLPZ IO 1-Wire 1-Wire 1-Wire DEVICE 1 DEVICE 2 DEVICE n 2 *R = I C PULLUP RESISTOR (SEE THE Pullup Resistor R Sizing SECTION FOR R SIZING) P P P 1-Wire is a registered trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6701 Rev 1 7/15 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.DS2484 Single-Channel 1-Wire Master with Adjustable Timing and Sleep Mode ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground .......-0.5V to +6V Operating Temperature Range .......................... -40NC to +85NC Maximum Current into Any Pin ...........................................20mA Junction Temperature .....................................................+150NC Storage Temperature Range ............................ -55NC to +125NC Continuous Power Dissipation (T = +70NC) A Lead Temperature (soldering, 10s) ................................+300NC SOT23 (derate 8.7mW/NC above +70NC) .................695.7mW Soldering Temperature (reflow) ......................................+260NC TDFN (derate 16.7mW/NC above +70NC) ...............1333.3mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion 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 (T = -40NC to +85NC, unless otherwise noted.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 1.71 5.25 V CC 1.8V 1.71 1.8 1.89 2 I C Voltage (Note 2) V 3.3V 2.97 3.3 3.63 V CI2C 5V 4.5 5.0 5.25 No communication, V = full range 300 CC Supply Current I Sleep mode, V = 5.25V 4 FA CC CC Sleep mode, V = 3.6V 3.0 CC Power-On-Reset Trip Point V V = full range 1.0 1.5 V POR CC IO PIN: GENERAL DATA 0.6 O 1-Wire Input High Voltage V V = full range V IH1 CC V CC 0.2 O 1-Wire Input Low Voltage V V = full range V IL1 CC V CC Low range 375 500 815 I 1-Wire Weak Pullup Resistor R WPU High range 700 1000 1375 1-Wire Output Low Voltage V I = 8mA sink current 0.2 V OL1 OL Active Pullup On-Threshold V V = full range 0.6 0.95 1.2 V IAPO CC 1-Wire time slot See APU bit description Active Pullup On-Time (Note 3) t 1-Wire reset standard speed 2.375 2.5 2.625 Fs APU 1-Wire reset overdrive speed 0.475 0.5 0.525 V = 1.71V, 4mA load 100 CC I Active Pullup Impedance R V = 3.0V, 4mA load 60 APU CC V = 4.5V, 4mA load 40 CC Standard, 10pF < C < 400pF 0.25 1 LOAD 1-Wire Output Fall Time (Note 4) t Fs F1 Overdrive, 10pF < C < 400pF 0.05 0.2 LOAD IO PIN: 1-Wire TIMING (Note 5) Standard See Reset Low Time t -5% +5% Fs RSTL Table 7 Overdrive Reset High Time t Standard and overdrive Equal to t Fs RSTH RSTL Maxim Integrated 2