DS1720S 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

零件编号

产品描述 (功能)

生产厂家

DS1720S

Econo – Digital Thermometer and Thermostat

Dallas Semiconductor -> Maxim Integrated 

DS1720

DETAILED PIN DESCRIPTION Table 2

PIN

SYMBOL DESCRIPTION

1

DQ

Data Input/Output pin for 3–wire communication port.

2

CLK/CONV Clock input pin for 3–wire communication port. When the DS1720 is used in a

stand–alone application with no 3–wire port, this pin can be used as a convert pin.

Temperature conversion will begin on the falling edge of CONV.

3

RST

Reset input pin for 3–wire communication port.

4

GND

Ground pin.

5

TCOM

High/Low Combination Trigger. Goes high when temperature exceeds TH; will

reset to low when temperature falls below TL.

6

TLOW

Low Temperature Trigger. Goes high when temperature falls below TL.

7

THIGH

High Temperature Trigger. Goes high when temperature exceeds TH.

8

VDD

Supply Voltage. 2.7V – 5.5V input power pin.

OPERATION–THERMOSTAT CONTROLS

Three thermally triggered outputs, THIGH, TLOW, and

TCOM, are provided to allow the DS1720 to be used as a

thermostat, as shown in Figure 3. When the DS1720’s

temperature meets or exceeds the value stored in the

high temperature trip register, the output THIGH

becomes active (high) and remains active until the

DS1720’s measured temperature becomes less than

the stored value in the high temperature register, TH.

The THIGH output can be used to indicate that a high

temperature tolerance boundary has been met or

exceeded, or as part of a closed loop system can be

used to activate a cooling system and to deactivate it

when the system temperature returns to tolerance.

The TLOW output functions similarly to the THIGH output.

When the DS1720’s measured temperature equals or

falls below the value stored in the low temperature regis-

ter, the TLOW output becomes active. TLOW remains

active until the DS1720’s temperature becomes greater

than the value stored in the low temperature register,

TL. The TLOW output can be used to indicate that a low

temperature tolerance boundary has been met or

exceeded, or as part of a closed loop system, can be

used to activate a heating system and to deactivate it

when the system temperature returns to tolerance.

The TCOM output goes high when the measured tem-

perature meets or exceeds TH, and will stay high until

the temperature equals or falls below TL. In this way,

any amount of hysteresis can be obtained.

THERMOSTAT OUTPUT OPERATION Figure 3

THIGH

030598 4/12

TLOW

TCOM

TL

TH

T (°C)

Share Link: