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- Kernel driver max6875
- =====================
- Supported chips:
- * Maxim MAX6874, MAX6875
- Prefix: 'max6875'
- Addresses scanned: 0x50, 0x52
- Datasheet:
- http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf
- Author: Ben Gardner <bgardner@wabtec.com>
- Module Parameters
- -----------------
- * allow_write int
- Set to non-zero to enable write permission:
- *0: Read only
- 1: Read and write
- Description
- -----------
- The Maxim MAX6875 is an EEPROM-programmable power-supply sequencer/supervisor.
- It provides timed outputs that can be used as a watchdog, if properly wired.
- It also provides 512 bytes of user EEPROM.
- At reset, the MAX6875 reads the configuration EEPROM into its configuration
- registers. The chip then begins to operate according to the values in the
- registers.
- The Maxim MAX6874 is a similar, mostly compatible device, with more intputs
- and outputs:
- vin gpi vout
- MAX6874 6 4 8
- MAX6875 4 3 5
- MAX6874 chips can have four different addresses (as opposed to only two for
- the MAX6875). The additional addresses (0x54 and 0x56) are not probed by
- this driver by default, but the probe module parameter can be used if
- needed.
- See the datasheet for details on how to program the EEPROM.
- Sysfs entries
- -------------
- eeprom_user - 512 bytes of user-defined EEPROM space. Only writable if
- allow_write was set and register 0x43 is 0.
- eeprom_config - 70 bytes of config EEPROM. Note that changes will not get
- loaded into register space until a power cycle or device reset.
- reg_config - 70 bytes of register space. Any changes take affect immediately.
- General Remarks
- ---------------
- A typical application will require that the EEPROMs be programmed once and
- never altered afterwards.
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