onewire/ibutton/ds1985/README

   1 -------------------------------------------------------------------------------
   2 Dallas DS1985 16kbit Add-Only iButton
   3 -------------------------------------------------------------------------------
   4
   5 This is a set of example captures of the 1-Wire traffic from a
   6 Dallas DS1985 iButton device.
   7
   8 This specific iButton device has a registration number of 0x05000000586ce20b
   9 (family code: 0x05, serial number: 0x000000586ce2, CRC: 0x0b).
  10
  11 The device has the following markings:
  12
  13   Dallas
  14   0050 Registered B1
  15   05  0B
  16   000000586CE2
  17   DS1985-F5
  18
  19 The "1-Wire/iButton Drivers for Windows" 4.03 software was used with a
  20 Maxim DS9097U-E25 serial port 1-Wire interface adapter (which itself
  21 contains a Maxim DS2480B serial 1-Wire line driver chip).
  22 The DS9097U-E25 was attached to a PC using a USB-to-serial adapter.
  23
  24 The following information can be seen in the Windows software for the
  25 respective dumps (when clicking on the respective tabs/entries):
  26
  27 Polling:
  28
  29  - The Windows software was configured as follows:
  30    - Device poll rate: 1 second
  31    - 1-Wire search mode: Show normal devices
  32
  33 Main memory:
  34
  35  - Contents: all-0xff (pages 0 - 63, each page 32 bytes in size)
  36  - Start address: 0
  37  - Bank size: 2048 bytes
  38  - General-purpose/non-volatile/read-only/read-write/write-once: Y/Y/N/N/Y
  39
  40 Write protect pages:
  41
  42  - Contents: ff ff ff ff ff ff ff ff
  43  - Start address: 0
  44  - Bank size: 8 bytes
  45  - General-purpose/non-volatile/read-only/read-write/write-once: N/Y/N/N/Y
  46
  47 Write protect redirection:
  48
  49  - Start address: 0x20
  50  - Bank size: 8 bytes
  51  - General-purpose/non-volatile/read-only/read-write/write-once: N/Y/N/N/Y
  52
  53 Bitmap of used pages for file structure:
  54
  55  - Start address: 0x40
  56  - Bank size: 8 bytes
  57  - General-purpose/non-volatile/read-only/read-write/write-once: N/Y/N/N/Y
  58
  59 Page redirection bytes:
  60
  61  - Contents: all-0xff (pages 0 - 3, each page 16 bytes in size)
  62  - Start address: 0x100
  63  - Bank size: 64 bytes
  64  - General-purpose/non-volatile/read-only/read-write/write-once: N/Y/N/N/Y
  65
  66 Details:
  67 https://en.wikipedia.org/wiki/1-Wire
  68 http://www.maxim-ic.com/datasheet/index.mvp/id/2827/t/al
  69 http://www.maxim-ic.com/app-notes/index.mvp/id/192
  70 http://www.maxim-ic.com/datasheet/index.mvp/id/2983/t/al
  71 http://www.maxim-ic.com/app-notes/index.mvp/id/192
  72
  73
  74 Logic analyzer setup
  75 --------------------
  76
  77 The logic analyzer used was a Saleae Logic (at 8MHz):
  78
  79   Probe       DS2480B pin
  80   -----------------------
  81   1 (black)   1-W
  82
  83 The sigrok command line used was:
  84
  85   sigrok-cli -d fx2lafw:samplerate=8mhz --time 5s -p 1=OWR -o <file>
  86