root/lm-sensors/trunk/doc/chips/ltc1710 @ 404

Revision 404, 2.5 KB (checked in by frodo, 15 years ago)

LTC1710 documentation updates

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1Kernel driver `ltc1710.o'
2=========================
3
4Status: Complete and well-tested
5
6Supported chips:
7  * Linear Technologies LTC1710
8    Prefix 'ltc1710'
9    Addresses scanned: I2C 0x58 - 0x5a (inclusive)
10    Datasheet: Publicly available at the Linear Technologies website
11
12Author: Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
13        <phil@netroedge.com>
14
15
16Module Parameters
17-----------------
18
19* force: short array (min = 1, max = 48)
20  List of adapter,address pairs to boldly assume to be present
21* force_ltc1710: short array (min = 1, max = 48)
22  List of adapter,address pairs which are unquestionably assumed to contain
23  a `ltc1710' chip
24* ignore: short array (min = 1, max = 48)
25  List of adapter,address pairs not to scan
26* ignore_range: short array (min = 1, max = 48)
27  List of adapter,start-addr,end-addr triples not to scan
28* probe: short array (min = 1, max = 48)
29  List of adapter,address pairs to scan additionally
30* probe_range: short array (min = 1, max = 48)
31  List of adapter,start-addr,end-addr triples to scan additionally
32
33
34Description
35-----------
36
37This is some documenation for the ltc1710 driver for the Linear
38Technologies LTC1710.
39
40The LTC1710 is a simple dual switch device with a SMBus interface.  It can
41switch a supply voltage to either of its two output pins independantly
42from the built-in SMBus interface.
43
44For each sensed LTC1710 there is a directory which looks something like:
45ltc1710-i2c-1-59
46
47For each directory there are the following files:
48
49* switch1 (LTC1710_SYSCTL_SWITCH_1)
50  Simply contains either a 1 or 0 depending on whether the switch is
51  currently turned on or off.
52* switch2 (LTC1710_SYSCTL_SWITCH_2)
53  Works the same way as switch1, but is for the second switch.
54
55Some notes: The LTC1710 is a *very* simple I2C/SMBus device.  It does not
56support reads, so the status of the switches isn't polled, but rather
57remembered.  The LTC1710 has enough 'umph' to drive 300mA with only 0.4 Ohm
58impedence (in an 'on' state).  This works well for LEDs, or to drive other
59devices (MOSFETs and such) which can multiply the switching effect.  The
60LTC1710 also contains an emergency over-temperature shut-off in the case
61of too much current flow.  Switch 2 switches the Vcc voltage on/off, but
62Switch 1 switches the voltage present on pin 1 (0V to Vcc).
63
64This driver was written and maintained by Philip Edelbrock
65<phil@netroedge.com>.  Please send comments/suggestions/corrections to him.
66For more technical information on the LTC1710, please get the Acrobat PDF
67from http://www.linear-tech.com/
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