DS28E18Q+T

DS28E18Q+T is a 1-Wire® to I²C/SPI bridge with a command sequencer. This 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 Analog Device'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. 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. It is used in applications such as examining environmental conditions, accessory identification and control, equipment configuration and monitoring, and grain elevator monitoring.

• Operate remote I²C or SPI devices using single contact 1-wire interface
• 512-byte sequencer for autonomous operation of attached devices
• Two configurable GPIO pins for additional peripheral control
• Flexible 1-wire and I²C/SPI host operational modes
• Operating voltage range from 2.97V to 3.63V
• 1-wire pullup resistance is 1000 ohm maximum at (TA = +25°C)
• Input load current is 8.5µA typical at (TA = +25°C)
• SCL clock frequency is 100KHz maximum at (TA = +25°C)
• Operating temperature range from -40°C to +85°C
• 8-pin TDFN-EP package

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