ISL12026IBZ-T7A【PDF 11/24 页】IC RTC/CALENDAR EEPROM 8SOIC

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FN8231.9

November 30, 2010

Sequential Read

Sequential reads can be initiated as either a current address

read or random address read. The first data byte is

transmitted as with the other modes; however, the master

now responds with an acknowledge, indicating it requires

additional data. The device continues to output data for each

acknowledge received. The master terminates the read

operation by not responding with an acknowledge and then

issuing a stop condition.

The data output is sequential, with the data from address n

followed by the data from address n + 1. The address

counter for read operations increments through all page and

column addresses, allowing the entire memory contents to

be serially read during one operation. At the end of the

address space, the counter “rolls over” to the start of the

address space, and the ISL12026 continues to output data

for each acknowledge received. Refer to Figure 22 for the

acknowledge and data transfer sequence.

Application Section

Crystal Oscillator and Temperature Compensation

Intersil has now integrated the oscillator compensation

circuity on-chip, to eliminate the need for external

components and adjust for crystal drift over temperature and

enable very high accuracy time keeping (<5ppm drift).

The Intersil RTC family uses an oscillator circuit with on-chip

crystal compensation network, including adjustable

load-capacitance. The only external component required is

the crystal. The compensation network is optimized for

operation with certain crystal parameters which are common

in many of the surface mount or tuning-fork crystals available

today. Table 7 summarizes these parameters.

Table 8 contains some crystal manufacturers and part numbers

that meet the requirements for the Intersil RTC products.

SLAVE

ADDRESS

WORD

ADDRESS 1

SLAVE

ADDRESS

DATA

SDA BUS

SIGNALS FROM

THE SLAVE

SIGNALS FROM

THE MASTER

WORD

ADDRESS 0

00 0 0 0 0 0

FIGURE 21. RANDOM ADDRESS READ SEQUENCE

DATA

(2)

SLAVE

ADDRESS

DATA

(n)

SDA BUS

SIGNALS FROM

THE SLAVE

SIGNALS FROM

THE MASTER

DATA

(n-1)

(n is any integer greater than 1)

DATA

(1)

FIGURE 22. SEQUENTIAL READ SEQUENCE

TABLE 7. CRYSTAL PARAMETERS REQUIRED FOR INTERSIL

RTCs

PARAMETER

MIN

TYP

MAX

UNITS

NOTES

Frequency

32.768

kHz

Frequency

Tolerance

±100

ppm

Down to 20ppm

if desired

Turnover

Temperature

°C

Typically the value

used for most

crystals

Operating Temp

Range

-40

°C

Parallel Load

Capacitance

12.5

Equivalent

Series

Resistance

For best oscillator

performance

ISL12026, ISL12026A

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