DS1626_07 Datasheet, PDF (2/14 Pages) Dallas Semiconductor – High-Precision 3-Wire Digital Thermometer and Thermostat

DS1626/DS1726
ORDERING INFORMATION
PART
PACKAGE MARKING
DESCRIPTION
DS1626U
1626
8-Pin μSOP
DS1626U+
1626 (See Note)
Lead-Free 8-Pin μSOP
DS1626U/T&R
1626
8-Pin μSOP, 3000-Piece Tape-and-Reel
DS1626U+T&R
1626 (See Note)
Lead-Free 8-Pin μSOP, 3000-Piece Tape-and-Reel
DS1726U
1726
8-Pin μSOP
DS1726U+
1726 (See Note)
Lead-Free 8-Pin μSOP
DS1726U/T&R
1726
8-Pin μSOP, 3000-Piece Tape-and-Reel
DS1726U+T&R
1726 (See Note)
Lead-Free 8-Pin μSOP, 3000-Piece Tape-and-Reel
Note: A “+” symbol will also be marked on the package near the Pin 1 indicator.
Table 2. DETAILED PIN DESCRIPTION
PIN SYMBOL
FUNCTION
1
DQ Data Input/Output Pin (Tri-State) for 3-Wire Serial Communication
2
CLK/CNV
Clock Input Pin for 3-Wire Serial Communication. Controls temperature
measurements when the DS1626/DS1726 is configured as a stand-alone thermostat
3
RST Reset Input Pin for 3-Wire Serial Communication
4
GND Ground Pin
5
T_COM Thermostat Output Pin (Push-Pull) with Programmable Hysteresis
6
T_LOW Thermostat Output Pin (Push-Pull) with T_L Trip Point
7
T_HIGH Thermostat Output Pin (Push-Pull) with T_H Trip Point
8
V_DD Supply Voltage. +2.7V to +5.5V Input Power Pin
Table 3. DS1626/DS1726 REGISTER SUMMARY
REGISTER NAME
(USER ACCESS)
SIZE
MEMORY
TYPE
REGISTER CONTENTS
AND POWER-UP/POR STATE
Temperature
(Read Only)
12 Bits
SRAM
Measured Temperature (Two’s Complement)
Power-Up/POR State: -60ºC (1100 0100 0000)
T_H
(Read/Write)
12 Bits
Upper Alarm Trip Point (Two’s Complement)
EEPROM Power-Up/POR State: User-Defined.
Initial State from Factory: +15°C (0000 1111 0000)
T_L
(Read/Write)
12 Bits
Lower Alarm Trip Point (Two’s Complement)
EEPROM Power-Up/POR State: User-Defined.
Initial State from Factory: +10°C (0000 1010 0000)
Configuration
Configuration and Status Information (Unsigned)
(Various Bits are
Read/Write and Read
1 Byte
SRAM and 4MSbs = SRAM and 4LSbs = EEPROM
EEPROM Power-Up/POR State: 1000XXXX (XXXX = User-
Only—See Table 5)
Defined)
Figure 1. DS1626/DS1726 FUNCTIONAL DIAGRAM
V_DD
GND
CLK/CNV
SDA
RST
ADDRESS
and
I/O CONTROL
CONFIGURATION REGISTER AND CONTROL LOGIC
TEMPERATURE SENSOR AND ΔΣ ADC
TEMPERATURE REGISTER
2 of 14
T_H REGISTER
DIGITAL
COMPARATOR/LOGIC
T_COM
T_HIGH
T_LOW