DS28EC20+ datasheet(10/24 Pages) DALLAS

Part #	DS28EC20+

Description	20Kb 1-Wire EEPROM

Download	24 Pages

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Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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DS28EC20: 20Kb 1-Wire EEPROM

10 of 24

Figure 7-1. Memory Function Flow Chart

0Fh

Write Scratch-

pad ?

Bus Master TX EEPROM

Array Target Address

TA1 (T[7:0]), TA2 (T[15:8])

Y

N

To Figure 7,

2

nd Part

From Figure 7,

2

nd Part

Bus Master TX Memory

Function Command

To ROM Functions

Flow Chart (Figure 9)

From ROM Functions

Flow Chart (Figure 9)

Master

TX Reset ?

Master TX Data Byte

To Scratchpad Offset

N

Y

DS28EC20 sets Scratch-

pad Offset = (T[4:0]),

Clears PF, AA, BS

Scrpad. Offset

= 11111b?

DS28EC20 TX CRC16

of Command, Address,

Data Bytes as they were

sent by the bus master

DS28EC20

Increments

Scratchpad

Offset

Master

TX Reset?

Y

N

Bus Master

RX “1”s

N

Partial

Byte ?

PF = 1

Y

N

Y

If the memory is write-protected, the

DS28EC20 copies the data byte from

the target address into the scratchpad.

If the memory is in EPROM mode, the

DS28EC20 stores the bitwise logical

AND of the transmitted byte and the

data byte from the targeted address

into the scratchpad.

DS28EC20 sets (E[4:0]) =

Scratchpad Offset

Note: The PF Flag is set upon power-

on reset. It is cleared only if a com-

plete 16-bit target address is trans-

mitted. Sending less than 16 bits for

the target address sets the PF flag.

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DS28EC20+ Datasheet(PDF) 10 Page - Dallas Semiconductor

DS28EC20+ Datasheet(HTML) 10 Page - Dallas Semiconductor

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