- 您现在的位置：买卖IC网 > Sheet目录222 > DS1923-F5# (Maxim Integrated)IBUTTON TEMP/HUMIDITY LOGGER F5
DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
Temperature Conversion
The DS1923’s temperature range begins at -20°C and
ends at +85°C. Temperature values are represented as
an 8-bit or 16-bit unsigned binary number with a resolu-
tion 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)
? (°C) = TRH/2 - 41 (8-bit mode, TLFS = 0,
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.
To specify the temperature alarm thresholds, the previ-
ous equations are resolved to:
Because the temperature alarm threshold is only one
byte, the resolution or temperature increment is limited to
0.5°C. The TALM value must be converted into hexadec-
imal 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.
Humidity Conversion
In addition to temperature, the DS1923 can log humidi-
ty data in an 8-bit or 16-bit format. Humidity values are
represented as 8-bit or 16-bit unsigned binary numbers
with a resolution of 0.64%RH in the 8-bit mode and
0.04%RH in the 16-bit mode.
The DS1923 reads data from its humidity sensor when-
ever a Forced Conversion command is executed (see
the Memory and Control Function Commands section)
or during a mission if the device is set up to log humidi-
ty data. Regardless of its setup, the DS1923 always
reads 16 bits from the humidity sensor. The result of the
latest humidity reading is found at address 020Eh (low
byte) and 020Fh (high byte). The most significant bit
read from the humidity sensor can always be found as
H11 at address 020Fh. Due to the 12-bit digital output
of the humidity sensor, the lower 4 bits in 16-bit format
are undefined.
TALM = 2 x ? (°C) + 82
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
8-Bit
8-Bit
16-Bit
16-Bit
HEX
54h
17h
54h
17h
TRH
DECIMAL
84
23
84
23
HEX
—
—
00h
60h
TRL
DECIMAL
—
—
0
96
(°C)
1.0
-29.5
1.000
-29.3125
Table 2. Temperature Alarm Threshold Examples
18
(°C)
25.5
-10.0
HEX
85h
3Eh
TALM
DECIMAL
133
62
Maxim Integrated
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
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
DS1985-F3+
IBUTTON 16KBit ADD-ONLY F3
相关代理商/技术参数
DS1923-F5#W
功能描述:iButton Hygrochron Temp/Hum Logger w/8KB DataLog 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
DS1923-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
DS19310
制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Color TV Owners Manual Manuel dinstructions du teleouleur Color TV Manual Del Propietario
DS193-K
制造商:Miyama Electric 功能描述:
DS193-R
制造商:Miyama Electric 功能描述:
DS193-U
制造商:Miyama Electric 功能描述:
DS193-W
制造商:Miyama Electric 功能描述:
DS193-Y
制造商:Miyama Electric 功能描述: