1-Wire to I2C/SPI Bridge with Command Sequencer
Click here to ask about the production status of specific part numbers. DS28E18 1-Wire® to I2C/SPI Bridge with Command
Sequencer General Description Benefits and Features The DS28E18 is a simple communications bridge that resides at a remote SPI or I2C sensor and allows the sensor to be controlled by just two wires coming from the
host system. It reduces the wire count from six (for SPI) or
four (for I2C). These two wires use Maxim’s 1-Wire protocol 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. ● Operate Remote I2C or SPI Devices Using SingleContact 1-Wire Interface The IC provides a 512-byte command sequencer in SRAM
that can be loaded with multiple I2C or SPI commands.
Once loaded, the host controller sends a command to
execute the sequence, power, and collect data from attached I2C or SPI peripherals. A subsequent 1-Wire command 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 I2C or SPI devices such as sensors,
ADCs, DACs, and display controllers.
When used as a bridge for I2C slave devices, the
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.
Configuring for I2C or SPI operation is performed with a
1-Wire command; I2C is the power-on default. When operating in I2C mode, two programmable GPIO pins are available for additional peripheral control.
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 …