DS1921G Просмотр технического описания (PDF) - Maxim Integrated

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DS1921G

Thermochron iButton

Maxim Integrated 

Thermochron iButton

Detailed Description

The DS1921G Thermochron iButton is an ideal device

to monitor the temperature of any object it is attached

to or shipped with, such as perishable goods or con-

tainers of temperature-sensitive chemicals. The gener-

al-purpose battery-backed SRAM can store an

electronic copy of shipping information, date of manu-

facture and other important data written as clear as well

as encrypted files. Note that the initial sealing level of

the DS1921G achieves IP56. Aging and use conditions

can degrade the integrity of the seal over time, there-

fore, for applications with significant exposure to liq-

uids, sprays, or other similar environments, it is

recommended to place the Thermochron in the DS9107

iButton capsule. The DS9107 provides a watertight

enclosure that has been rated to IP68 (refer to

Application Note 4126: Understanding the IP (Ingress

Protection) Ratings of iButton Data Loggers and

Capsule).

Overview

Figure 1 shows the relationships between the major

control and memory sections of the DS1921G. The

device has seven main data components: 64-bit

lasered ROM; 256-bit scratchpad; 4096-bit general-

purpose SRAM; 256-bit register page of timekeeping,

control, and counter registers; 96 bytes of alarm time-

stamp and duration logging memory; 126 bytes of

1-Wire PORT IO

ROM

FUNCTION

CONTROL

64-BIT

LASERED

ROM

PARASITE-POWERED

CIRCUITRY

DS1921G

MEMORY

FUNCTION

CONTROL

256-BIT

SCRATCHPAD

32.768kHz

OSCILLATOR

TEMPERATURE

CORE

GENERAL-PURPOSE

SRAM

INTERNAL

TIMEKEEPING,

CONTROL REGISTERS,

AND COUNTERS

REGISTER PAGE

ALARM TIMESTAMP AND

DURATION LOGGING

MEMORY

HISTOGRAM

MEMORY

CONTROL

LOGIC

DATA-LOG MEMORY

3V LITHIUM

Figure 1. Block Diagram

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