- 您现在的位置：买卖IC网 > Sheet目录221 > DS1922L-F5# (Maxim Integrated)IBUTTON TEMP LOGGER
DS1922L/DS1922T
iButton Temperature Loggers
with 8KB Data-Log Memory
Temperature Conversion
The DS1922L’s temperature range begins at -40°C and
ends at +85°C. The temperature range for the DS1922T
begins at 0 and ends at +125°C. Temperature values
are represented as an 8-bit or 16-bit unsigned binary
number with a resolution of 0.5°C in 8-bit mode and
0.0625°C in 16-bit mode.
The higher temperature byte TRH is always valid. In
16-bit mode, only the three highest bits of the lower
byte TRL are valid. The five lower bits all read 0. TRL is
undefined if the device is in 8-bit temperature mode. An
out-of-range temperature reading is indicated as 00h or
0000h when too cold and FFh or FFE0h when too hot.
With TRH and TRL representing the decimal equivalent
of a temperature reading, the temperature value is cal-
culated as:
? (°C) = TRH/2 - 41 + TRL/512 (16-bit mode,
TLFS = 1, see address 0213h)
This equation is valid for converting temperature read-
ings stored in the data-log memory as well as for data
read from the Latest Temperature Conversion Result
register. The “-41 ” applies to the DS1922L. For the
DS1922T, use “-1” instead of “-41.”
To specify the temperature alarm thresholds, the previ-
ous equations are resolved to:
TALM = 2 x ? (°C) + 82
The “+82” applies to the DS1922L. For the DS1922T, use
“+2.” Because the temperature alarm threshold is only
one byte, the resolution or temperature increment is limit-
ed to 0.5°C. The TALM value must be converted into
hexadecimal format before it can be written to one of the
Temperature Alarm Threshold registers (Low Alarm
address 0208h; High Alarm address 0209h).
Independent of the conversion mode (8-bit or 16-bit),
only the most significant byte of a temperature conver-
sion is used to determine whether an alarm is generated.
? (°C) = TRH/2 - 41 (8-bit mode, TLFS = 0,
see address 0213h)
Latest Temperature Conversion Result Register Bitmap
ADDRESS
020Ch
020Dh
BIT 7
T2
T10
BIT 6
T1
T9
BIT 5
T0
T8
BIT 4
0
T7
BIT 3
0
T6
BIT 2
0
T5
BIT 1
0
T4
BIT 0
0
T3
BYTE
TRL
TRH
Table 1. Temperature Conversion Examples
MODE
HEX
TRH
DECIMAL
HEX
TRL
DECIMAL
DS1922L
(°C)
DS1922T
8-Bit
8-Bit
16-Bit
16-Bit
54h
17h
54h
17h
84
23
84
23
—
—
00h
60h
—
—
0
96
1.0
-29.5
1.000
-29.3125
41.0
10.5
41.000
10.6875
Table 2. Temperature Alarm Threshold Examples
(°C)
TALM (DS1922T)
HEX DECIMAL
(°C)
TALM (DS1922L)
HEX DECIMAL
65.5
30.0
85h
3Eh
133
62
25.5
-10.0
85h
3Eh
133
62
20
Maxim Integrated
发布紧急采购，3分钟左右您将得到回复。
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
DS1922L-F5#A20
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
DS1922L-F5#A22
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
DS1922L-F5#W
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
DS1922L-F5/A1E
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
DS1922L-F5/A20
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
DS1922L-F5+
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
DS1922L-F50
制造商:Maxim Integrated Products 功能描述:THERMOCHRON,IBTN,F5,HI-RES,8 - Rail/Tube
DS1922L-F5W
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