Rainbow Electronics DS1726 - Manual

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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
PIN CONFIGURATION
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.
DS1626/DS1726
High-Precision 3-Wire Digital
Thermometer and Thermostat
www.maxim-ic.com
mSOP
(DS1626U, DS1726U*)
CLK/ CNV
V
DD
T
HIGH
T
LOW
T
COM
GND
RST
DQ
6
8
7
5
3
1
2
4
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
*Future product—contact factory for availability.