DS1626 Datasheet, PDF (1/13 Pages) Dallas Semiconductor – High-Precision 3-Wire Digital Thermometer and Thermostat

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FEATURES
§ Temperature Measurements Require No
External Components
§ Measure Temperatures from -55°C to +125°C
(-67°F to +257°F)
§ DS1626: ±0.5°C Accuracy from 0°C to
+70°C
§ DS1726: ±1°C Accuracy from -10°C to
+85°C
§ Output Resolution is User-Selectable to 9, 10,
11, or 12 Bits
§ Wide Power-Supply Range (2.7V to 5.5V)
§ Convert Temperature to Digital Word in
750ms (max)
§ Stand-Alone Thermostat Capability
§ Thermostatic Settings are User-Definable and
Nonvolatile (NV)
§ Data is Read/Written Through a 3-Wire Serial
Interface
§ Available in 8-Pin mMAX/mSOP Package
DS1626/DS1726
High-Precision 3-Wire Digital
Thermometer and Thermostat
PIN CONFIGURATION
DQ ¹
8
V_DD
CLK/CNV ²
RST 3
7
T_HIGH
6
T_LOW
GND 4
5
T_COM
mSOP
(DS1626U, DS1726U)
See Table 1 for Ordering Information
See Table 2 for Pin Descriptions
APPLICATIONS
§ Thermostatic Controls
§ Industrial Controls
§ Consumer Products
§ Any Space-Constrained Thermally Sensitive
Application
DESCRIPTION
The DS1626 and DS1726 digital thermometers/thermostats provide temperature measurements and stand-
alone thermostat capability over a -55°C to +125°C range. The DS1626 offers ±0.5°C accuracy from 0°C to
+70°C and the DS1726 has ±1°C accuracy from -10°C to +85°C. The resolution of the measured
temperature is user-selectable from 9 to 12 bits. Communication with the DS1626 and DS1726 is achieved
through a 3-wire serial bus.
The DS1626 and DS1726 offer thermostatic functionality with three dedicated thermostat outputs (T_HIGH,
T_LOW, and T_COM), and over-temperature (T_H) and under-temperature (T_L) user-programmable thresholds
stored in on-chip EEPROM. For stand-alone thermostat operation, T_H and T_L can be programmed prior to
installation, and the DS1626/DS1726 can be configured to automatically begin taking temperature
measurements at power-up.
Pin descriptions for the DS1626 and DS1726 are provided in Table 2 and user-accessible registers are
summarized in Table 3. A functional diagram is shown in Figure 1.
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06/10/03