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DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
Alarm Status Register Bitmap
ADDRESS
0214h
BIT 7
BOR
BIT 6
1
BIT 5
1
BIT 4
1
BIT 3
0
BIT 2
0
BIT 1
THF
BIT 0
TLF
Note: There is only read access to this register. Bits 4 to 6 have no function. They always read 1. Bits 2 and 3 have no function with
the DS1922L/DS1922T. They always read 0. The alarm status bits are cleared simultaneously when the Clear Memory Function is
invoked. See the Memory and Control Function Commands section for details.
General Status Register Bitmap
ADDRESS
0215h
BIT 7
1
BIT 6
1
BIT 5
0
BIT 4
WFTA
BIT 3
MEMCLR
BIT 2
0
BIT 1
MIP
BIT 0
0
Note: There is only read access to this register. Bits 0, 2, 5, 6, and 7 have no function.
Alarm Status
The fastest way to determine whether a programmed
temperature threshold was exceeded during a mission
is by reading the Alarm Status register. In a networked
environment that contains multiple DS1922L/
DS1922T devices, the devices that encountered an
alarm can quickly be identified by means of the
Conditional Search command (see the 1-Wire ROM
Function Commands section). The temperature alarm
only occurs if enabled (see the Temperature Sensor
Alarm section). The BOR alarm is always enabled.
Bit 7: Battery-On Reset Alarm (BOR). If this bit reads
1, the device has performed a power-on reset. This
indicates that the device has experienced a shock big
enough to interrupt the internal battery power supply.
The device can still appear functional, but it has lost its
factory calibration. Any data found in the data-log mem-
ory should be disregarded.
Bit 1: Temperature High Alarm Flag (THF). If this bit
reads 1, there was at least one temperature conversion
during a mission revealing a temperature equal to or
higher than the value in the Temperature High Alarm
register. A forced conversion can affect the THF bit.
This bit can also be set with the initial alarm in the SUTA
= 1 mode.
Bit 0: Temperature Low Alarm Flag (TLF). If this bit
reads 1, there was at least one temperature conversion
during a mission revealing a temperature equal to or
lower than the value in the Temperature Low Alarm reg-
ister. A forced conversion can affect the TLF bit. This bit
can also be set with the initial alarm in the SUTA = 1
mode.
Maxim Integrated
General Status
The information in the General Status register tells the
host computer whether a mission-related command
was executed successfully. Individual status bits indi-
cate whether the DS1922L/DS1922T are performing a
mission, waiting for a temperature alarm to trigger the
logging of data, or whether the data from the latest mis-
sion has been cleared.
Bit 4: Waiting for Temperature Alarm (WFTA). If this
bit reads 1, the Mission Start Upon Temperature Alarm
was selected and the Start Mission command was suc-
cessfully executed, but the device has not yet experi-
enced the temperature alarm. This bit is cleared after a
temperature alarm event, but is not affected by the
Clear Memory command. Once set, WFTA remains set
if a mission is stopped before a temperature alarm
occurs. To clear WFTA manually before starting a new
mission, set the high temperature alarm (address
0209h) to -40°C and perform a forced conversion.
Bit 3: Memory Cleared (MEMCLR). If this bit reads 1,
the Mission Timestamp, Mission Samples Counter, and
all the alarm flags of the Alarm Status register have
been cleared in preparation of a new mission.
Executing the Clear Memory command clears these
memory sections. The MEMCLR bit returns to 0 as soon
as a new mission is started by using the Start Mission
command. The memory must be cleared for a mission
to start.
Bit 1: Mission in Progress (MIP). If this bit reads 1, the
device has been set up for a mission and this mission is
still in progress. The MIP bit returns from logic 1 to logic
0 when a mission is ended. See the Start Mission with
Password and Stop Mission with Password sections.
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相关PDF资料
DS1923-F5#
IBUTTON TEMP/HUMIDITY LOGGER F5
DS1961S-F3#
IBUTTON EEPROM 1KBit F3
DS1963S-F5+
IBUTTON MONETARY SHA-1
DS1971-F3+
IBUTTON EEPROM 256KBIT F3
DS1972-F3+
IBUTTON EEPROM 1KBit F3
DS1973-F3+
IBUTTON EEPROM 4KBit F3
DS1977-F5#
IBUTTON EEPROM 32KBit F5
DS1982-F5+
IBUTTON 1KBit ADD-ONLY F5
相关代理商/技术参数
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功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated
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