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1Kernel driver max6875
2=====================
3
4Supported chips:
5 * Maxim max6874, max6875
6 Prefixes: 'max6875'
7 Addresses scanned: 0x50, 0x52
8 Datasheets:
9 http://pdfserv.maxim-ic.com/en/ds/MAX6874-MAX6875.pdf
10
11Author: Ben Gardner <bgardner@wabtec.com>
12
13
14Module Parameters
15-----------------
16
17* allow_write int
18 Set to non-zero to enable write permission:
19 *0: Read only
20 1: Read and write
21
22
23Description
24-----------
25
26The MAXIM max6875 is a EEPROM-programmable power-supply sequencer/supervisor.
27It provides timed outputs that can be used as a watchdog, if properly wired.
28It also provides 512 bytes of user EEPROM.
29
30At reset, the max6875 reads the configuration eeprom into its configuration
31registers. The chip then begins to operate according to the values in the
32registers.
33
34See the datasheet for details on how to program the EEPROM.
35
36
37Sysfs entries
38-------------
39
40eeprom_user - 512 bytes of user-defined EEPROM space. Only writable if
41 allow_write was set and register 0x43 is 0.
42
43eeprom_config - 70 bytes of config EEPROM. Note that changes will not get
44 loaded into register space until a power cycle or device reset.
45
46reg_config - 70 bytes of register space. Any changes take affect immediately.
47
48
49General Remarks
50---------------
51
52A typical application will require that the EEPROMs be programmed once and
53never altered afterwards.
54