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DS28E18
1-Wire to I C/SPI Bridge with Command
Sequencer
General Description
Benefits and Features
● Operate Remote I C or SPI Devices Using Single-
2
The DS28E18 is a simple communications bridge that re-
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
host system. It reduces the wire count from six (for SPI) or
four (for I C). These two wires use Maxim’s 1-Wire proto-
col that combines power and signal on a single wire, and
which is driven by the programmable I/O pins on the host’s
microcontroller. The 1-Wire network supports connection
lengths up to 100m and 10 sensor nodes or more.
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• Extending I C/SPI Communication Distance
2
• Reduce Six Wires (for SPI) or Four Wires (for I C)
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to Two Wires
• 512-Byte Sequencer for Autonomous Operation of
Attached Devices
• Two Configurable GPIO Pins for Additional
Peripheral Control
The IC provides a 512-byte command sequencer in SRAM
that can be loaded with multiple I C or SPI commands.
● No External Power Required
2
• DS28E18 Parasitically Powered from 1-Wire
Once loaded, the host controller sends a command to
execute the sequence, power, and collect data from at-
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• I C/SPI Peripheral Power Derived from the 1-Wire
Line
2
tached I C or SPI peripherals. A subsequent 1-Wire com-
mand reads collected data. Power for attached sensors
or peripherals is sourced from the 1-Wire line making
the DS28E18 a very efficient solution to remotely power
and control complex I C or SPI devices such as sensors,
ADCs, DACs, and display controllers.
2
● Flexible 1-Wire and I C/SPI Master Operational
Modes
• Supports Standard (11kbps) and Overdrive
(90kbps) 1-Wire Communication
• 100kHz, 400kHz, and 1MHz for I C Slaves
2
2
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
mode, multiple clock rates are supported up to 2.3MHz.
● Easy to Integrate
• Small, 2mm x 3mm x 0.75mm, 8-Pin TDFN
Package
• -40°C to +85°C Operation
• 2.97V to 3.63V Operating Voltage Range
2
Configuring for I C or SPI operation is performed with a
2
1-Wire command; I C is the power-on default. When oper-
2
ating in I C mode, two programmable GPIO pins are avail-
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
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