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参数资料
| 型号： | DS1621V/T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 4/16页 |
| 文件大小： | 337K |
| 描述： | IC THERMOMETER/STAT DIG 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 功能： | 温度计，恒温计 |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C（最小值） |
| 拓扑： | ADC（三角积分型），比较器，寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.209"，5.30mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1621
4 of 16
Table 2. TEMPERATURE/DATA RELATIONSHIPS
TEMPERATURE
DIGITAL OUTPUT
(Binary)
DIGITAL OUTPUT
(Hex)
+125癈
01111101 00000000
7D00h
+25癈
00011001 00000000
1900h
+桨C
00000000 10000000
0080h
+0癈
00000000 00000000
0000h
-桨C
11111111 10000000
FF80h
-25癈
11100111 00000000
E700h
-55癈
11001001 00000000
C900h
Since data is transmitted over the 2-wire bus MSB first, temperature data may be written to/read from the
DS1621 as either a single byte (with temperature resolution of 1癈) or as two bytes. The second byte
would contain the value of the least significant (0.5癈) bit of the temperature reading as shown in Table
1. Note that the remaining 7 bits of this byte are set to all "0"s.
Temperature is represented in the DS1621 in terms of a 桨C LSB, yielding the following 9-bit format:
Figure 2. TEMPERATURE, TH, and TL FORMAT
T = -25癈
Higher resolutions may be obtained by reading the temperature and truncating the 0.5癈 bit (the LSB)
from the read value. This value is TEMP_READ. A Read Counter command should be issued to yield the
COUNT_REMAIN value. The Read Slope command should then be issued to obtain the
COUNT_PER_C value. The higher resolution temperature may be then be calculated by the user using
the following:
TEMPERATURE=TEMP_READ-0.25 +
C
PER
COUNT
REMAIN
COUNT
C
PER
COUNT
_
_
)
_
_
_
(
-
The DS1621 always powers up in a low power idle state, and the Start Convert T command must be used
to initiate conversions.
The DS1621 can be programmed to perform continuous consecutive conversions (continuous-conversion
mode) or to perform single conversions on command (one-shot mode). The conversion mode is
programmed through the 1SHOT bit in the configuration register as explained in the Operation and
Control section of this datasheet. In continuous conversion mode, the DS1621 begins continuous
conversions after a Start Convert T command is issued. Consecutive conversions continue to be
performed until a Stop Convert T command is issued, at which time the device goes into a low-power idle
state. Continuous conversions can be restarted at any time using the Start Convert T command.
1
1
1
0
0
1
1
1
0
0
0
0
0
0
0
0
MSB
LSB
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