DS2422 Просмотр технического описания (PDF) - Maxim Integrated

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DS2422

1-Wire Temperature/Datalogger with 8KB Datalog Memory

Maxim Integrated 

ADDR

b7

0228h

—

022Fh

0230h

—

0237h

0238h

—

023Fh

b6

b5

b4

b3

b2

b1

First Byte

—

Eighth Byte

First Byte

—

Eighth Byte

(no function; all of these bytes read 00h)

DS2422

b0

Function Access*

Read

Access

Password

Full

Access

Password

W; —

W; —

(N/A)

R; R

Figure 8B. DS2422 Trim Register Page Map

ADDR

b7

b6

b5

b4

b3

b2

b1

b0

0400h

delay value

0401h

—

0403h

0404h

0405h

0

0406h

(no function; undefined read)

Temperature Counter Reset Low Byte

0

0

Temperature Counter Reset High Byte

Temperature Conversion Length Low Byte

0407h

0

0

0

Temperature Conversion Length High Byte

0408h

—

(no function; undefined read)

041Fh

Function

tSP

(N/A)

Access*

R/W; R

R; R

R/W; R/W

R/W; R/W

(N/A)

R; R

Note: The first entry in column ACCESS TYPE is valid between missions. The second entry shows the applicable

access type while a mission is in progress.

TIMEKEEPING AND CALENDAR

The RTC and calendar information is accessed by reading/writing the appropriate bytes in the register page,

address 200h to 205h. For readings to be valid, all RTC registers must be read sequentially starting at address

0200h. Some of the RTC bits are set to 0. These bits always read 0 regardless of how they are written. The

number representation of the RTC registers is BCD format (binary-coded decimal).

Real-Time Clock Register Bitmap

ADDR

0200h

0201h

0202h

0203h

0204h

0205h

b7

0

0

0

0

CENT

b6

b5

b4

10s

10 min.

12/24 20hr 10hr

AM/PM

0

10 Date

0

0

10m.

10yrs

b3

b2

b1

b0

Single Seconds

Single Minutes

Single Hours

Single Date

Single Months

Single Years

The RTC of the DS2422 can run in either 12-hour or 24-hour mode. Bit 6 of the Hours Register (address 202h) is

defined as the 12- or 24-hour mode select bit. When high, the 12-hour mode is selected. In the 12-hour mode, bit 5

is the AM/PM bit with logic 1 being PM. In the 24-hour mode, bit 5 is the 20-hour bit (20 to 23 hours). The CENT bit,

bit 7 of the Months Register, can be written by the user. This bit changes its state when the years counter

transitions from 99 to 00.

The calendar logic is designed to automatically compensate for leap years. For every year value that is either 00 or

a multiple of 4 the device adds a 29th of February. This works correctly up to (but not including) the year 2100.

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