MAX32665-MAX32668 User Guide
Maxim Integrated Page 387 of 457
20. 1-Wire Master (OWM)
The device provides a 1-Wire master (OWM) that you can use to communicate with one or more external 1-Wire slave
devices using a single-signal, combined clock, data protocol. The OWM is contained in the OWM module. The OWM module
handles the lower-level details (including timing and drive modes) required by the 1-Wire protocol, allowing the CPU to
communicate over the 1-Wire bus at a logical data level.
The OWM provides the following features:
• Flexible, 1-Wire timing generation (required 1MHz timing base) using the OWM module clock frequency, which is
in turn derived from the current system clock source. You can also prescale the OWM module clock to allow
proper 1-Wire timing generation using a range of base frequencies.
• Automatic generation of proper 1-Wire time slots for both standard and overdrive timing modes.
• Flexible configuration for 1-Wire line pullup modes: options for internal pullup, external fixed pullup, and optional
external strong pullup are available.
• Long-line compensation and bit banging (direct firmware drive) modes.
• 1-Wire reset generation and presence-pulse detection.
• Generation of 1-Wire read and write time slots for single-bit and eight-bit byte transmissions.
• Search ROM Accelerator (SRA) mode, which simplifies the generation of multiple-bit time slots and discrepancy
resolution required when completing the Search ROM function to determine the IDs of multiple, unknown 1-Wire
slaves on the bus.
• Transmit data completion, received data available, presence pulse detection, and 1-Wire line-error condition
interrupts.
For more information about the Maxim 1-Wire protocol and supporting devices, refer to the following resources:
• AN937: The Book of iButton® Standards
www.maximintegrated.com/AN937
• AN1796: Overview of 1-Wire Technology and Its Use
www.maximintegrated.com/AN1796
• AN187: 1-Wire Search Algorithm
www.maximintegrated.com/AN187
20.1 Instances
There is one instance of this peripheral.
iButton is a registered trademark of Maxim Integrated Products, Inc.
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