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DS1922E
iButton High-Temperature Logger with
8KB Data-Log Memory
Device Samples Counter Register
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0223h
0224h
0225h
Low Byte
Center Byte
High Byte
Note: There is only read access to this register.
Device Configuration Register
ADDRESS
0226h
BIT 7
0
0
0
0
1
BIT 6
0
0
1
1
0
BIT 5
0
1
0
1
0
BIT 4
0
0
0
0
0
BIT 3
0
0
0
0
0
BIT 2
0
0
0
0
0
BIT 1
0
0
0
0
0
BIT 0
0
0
0
0
0
PART
DS2422
DS1923
DS1922L
DS1922T
DS1922E
Note: There is only read access to this register.
Password Control Register
ADDRESS
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
0227h
Note: During a mission, there is only read access to this register.
Other Indicators
The Device Samples Counter register is similar to the
Mission Samples Counter register. During a mission this
counter increments whenever the DS1922E wakes up
to measure and log data and when the device is testing
for a temperature alarm in SUTA mode. Between mis-
sions the counter increments whenever the Forced
Conversion command is executed. This way the Device
Samples Counter register functions like a gas gauge for
the battery that powers the device.
The Device Samples Counter register is reset to zero
when the device is assembled. The number format is
24-bit unsigned integer. The maximum number that can
be represented in this format is 16,777,215. Due to the
calibration and tests at the factory, new devices can
have a count value of up to 35,000. The typical value is
well below 10,000.
The code in the Device Configuration register allows
the master to distinguish between the DS2422 chip and
different versions of the DS1922 devices. The Device
Configuration Register table shows the codes assigned
to the various devices.
18
EPW
Security by Password
The DS1922E is designed to use two passwords that
control read access and full access. Reading from or
writing to the scratchpad as well as the forced conver-
sion command does not require a password. The pass-
word must be transmitted immediately after the
command code of the memory or control function. If
password checking is enabled, the password transmit-
ted is compared to the passwords stored in the device.
The data pattern stored in the Password Control regis-
ter determines whether password checking is enabled.
To enable password checking, the EPW bits need to
form a binary pattern of 10101010 (AAh). The default
pattern of EPW is different from AAh. If the EPW pattern
is different from AAh, any pattern is accepted as long
as it has a length of exactly 64 bits. Once enabled,
changing the passwords and disabling password
checking requires the knowledge of the current full-
access password.
Maxim Integrated
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相关PDF资料
DS1922L-F5#
IBUTTON TEMP LOGGER
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