DS1626/DS1726
2 of 12
PIN DESCRIPTION
PIN
NAME
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 1. 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 (Twos Complement)
Power-Up/POR State: -60篊 (1100 0100 0000)
T
H
(Read/Write)
12 Bits
EEPROM
Upper Alarm Trip Point (Twos Complement)
Power-Up/POR State: User Defined
Initial State from Factory: +15癈 (0000 1111 0000)
T
L
(Read/Write)
12 Bits
EEPROM
Lower Alarm Trip Point (Twos Complement)
Power-Up/POR State: User Defined
Initial State from Factory: +10癈 (0000 1010 0000)
Configuration
(Various Bits are
Read/Write and Read
OnlySee Table 3)
1 Byte
SRAM and
EEPROM
Configuration and Status Information (Unsigned)
4MSbs = SRAM and 4LSbs = EEPROM
Power-Up/POR State: 1000XXXX (XXXX = User
Defined)
Figure 1. DS1626/DS1726 FUNCTIONAL DIAGRAM
T
T
T
LOW
T
H
REGISTER
DIGITAL
COMPARATOR/LOGIC
CONFIGURATION REGISTER AND CONTROL LOGIC
ADDRESS
and
I/O CONTROL
V
DD
CLK/ NV
SD
ST
TEMPERATURE SENSOR AND 敚 ADC
TEMPERATURE REGISTER
T
L
REGISTER
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