DS620 Digital Thermometer and Thermostat
2 of 15
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
SDA
Data Input/Output Pin for serial communication. Open drain. (No diode connection to V
DD
).
2
SCL
Clock Input Pin for 2-wire serial communication.
3
PO
Programmable Output Pin. Open drain. (No diode connection to V
DD
).
4
GND
Ground Pin.
5
A2
Address Input Pin.
6
A1
Address Input Pin. Also serves as an input to trigger one-shot conversions during standalone use.
7
A0
Address Input Pin.
8
V
DD
Supply Voltage Pin. +1.7V to +3.5V power supply pin.
PAD
PAD. Connect to GND or float. DO NOT CONNECT TO SUPPLY. The exposed pad is the best way to conduct
temperature into the package. Connecting PAD to a ground plane can assist in properly measuring the
temperature of the circuit board.
Figure 1. Block Diagram
Memory Array
2-Wire Interface
Charge Pump
Temp. Core
Bandgap
ADC
POR
Digital Control
PO Pin
Control
Address Counter
Address/Command
Decode
Conversion Control
Configuration Register
TH, TL Registers
Digital Comparator
Temperature Register
User EEPROM Registers
Temperature Counter
Memory Interface Logic
PO
SCL
SDA
A2
A1
A0
DS620