DS1620 Просмотр технического описания (PDF) - Maxim Integrated

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производитель

DS1620

Digital Thermometer and Thermostat

Maxim Integrated 

THERMOSTAT OUTPUT OPERATION Figure 3

THIGH

DS1620

TLOW

TCOM

TL

TH

T(°C)

OPERATION AND CONTROL

The DS1620 must have temperature settings resident in the TH and TL registers for thermostatic

operation. A configuration/status register also determines the method of operation that the DS1620 will

use in a particular application and indicates the status of the temperature conversion operation. The

configuration register is defined as follows:

CONFIGURATION/STATUS REGISTER

DONE

THF

TLF

NVB

1

0

CPU

1SHOT

where

DONE = Conversion Done Bit. 1=conversion complete, 0=conversion in progress. The power-up/POR

state is a 1.

THF = Temperature High Flag. This bit will be set to 1 when the temperature is greater than or equal

to the value of TH. It will remain 1 until reset by writing 0 into this location or by removing power from

the device. This feature provides a method of determining if the DS1620 has ever been subjected to

temperatures above TH while power has been applied. The power-up/POR state is a 0.

TLF = Temperature Low Flag. This bit will be set to 1 when the temperature is less than or equal to

the value of TL. It will remain 1 until reset by writing 0 into this location or by removing power from the

device. This feature provides a method of determining if the DS1620 has ever been subjected to

temperatures below TL while power has been applied. The power-up/POR state is a 0.

NVB = Nonvolatile Memory Busy Flag. 1=write to an E2 memory cell in progress. 0=nonvolatile

memory is not busy. A copy to E2 may take up to 10 ms. The power-up/POR state is a 0.

CPU = CPU Use Bit. If CPU=0, the CLK/ CONV pin acts as a conversion start control, when RST is

low. If CPU is 1, the DS1620 will be used with a CPU communicating to it over the 3–wire port, and the

operation of the CLK/ CONV pin is as a normal clock in concert with DQ and RST . This bit is stored in

nonvolatile E2 memory, capable of at least 50,000 writes. The DS1620 is shipped with CPU=0.

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