Click here to ask about the production status of specific part numbers. 2 DS28E18 1-Wire to I C/SPI Bridge with Command Sequencer General Description Benefits and Features 2 The DS28E18 is a simple communications bridge that re- Operate Remote I C or SPI Devices Using Single- 2 sides at a remote SPI or I C sensor and allows the sen- Contact 1-Wire Interface sor to be controlled by just two wires coming from the 2 Extending I C/SPI Communication Distance host system. It reduces the wire count from six (for SPI) or 2 Reduce Six Wires (for SPI) or Four Wires (for I C) 2 four (for I C). These two wires use Maxims 1-Wire proto- to Two Wires col that combines power and signal on a single wire, and 512-Byte Sequencer for Autonomous Operation of which is driven by the programmable I/O pins on the hosts Attached Devices microcontroller. The 1-Wire network supports connection Two Configurable GPIO Pins for Additional lengths up to 100m and 10 sensor nodes or more. Peripheral Control The IC provides a 512-byte command sequencer in SRAM No External Power Required 2 that can be loaded with multiple I C or SPI commands. DS28E18 Parasitically Powered from 1-Wire Once loaded, the host controller sends a command to 2 I C/SPI Peripheral Power Derived from the 1-Wire execute the sequence, power, and collect data from at- Line 2 tached I C or SPI peripherals. A subsequent 1-Wire com- mand reads collected data. Power for attached sensors 2 Flexible 1-Wire and I C/SPI Master Operational or peripherals is sourced from the 1-Wire line making Modes the DS28E18 a very efficient solution to remotely power Supports Standard (11kbps) and Overdrive 2 and control complex I C or SPI devices such as sensors, (90kbps) 1-Wire Communication ADCs, DACs, and display controllers. 2 100kHz, 400kHz, and 1MHz for I C Slaves 2 When used as a bridge for I C slave devices, the Up to 2.3MHz for SPI Slaves DS28E18 communicates at standard mode (100kHz), fast mode (400kHz) or fast-mode plus (Fm+, 1MHz). In SPI Easy to Integrate mode, multiple clock rates are supported up to 2.3MHz. Small, 2mm x 3mm x 0.75mm, 8-Pin TDFN 2 Configuring for I C or SPI operation is performed with a Package 2 1-Wire command I C is the power-on default. When oper- -40C to +85C Operation 2 ating in I C mode, two programmable GPIO pins are avail- 2.97V to 3.63V Operating Voltage Range able for additional peripheral control. Ordering Information appears at end of data sheet. Each DS28E18 provides a unique and secure 64-bit ROM identification number (ROM ID) that serves as the device s address on the 1-Wire bus. Multiple DS28E18 devices can coexist with other devices in a 1-Wire network and be ac- cessed individually without affecting other devices. Applications Examining Environmental Conditions Accessory Identification and Control Equipment Configuration and Monitoring Grain Elevator Monitoring 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 19-100832 Rev 0 6/20 2 DS28E18 1-Wire to I C/SPI Bridge with Command Sequencer Simplified Application Block Diagram REMOTE SPI SE NSOR SPI S LAVE DDSS2288EE1188 HOS T SY STEM SENS VDD VDD 2 W IRES VCC UP TO 100M SS SS R PUP 10 NODES SCLK SCLK V Q1 CC OR MORE SI MOSI PIOX MISO SO C C EXT PIOY IO C X GND GND GND 19-100832 www.maximintegrated.com Maxim Integrated 2