DS28EC20P+

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27

DS28EC20: 20Kb 1-Wire EEPROM

13 of 27

Figure 7-2. Memory Function Flowchart (continued)

AAh

Read Scratch-

Pad ?

DS28EC20 sets Scratch-

pad Offset = (T[4:0])

Bus Master RX

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

and E/S Byte

Bus Master RX Data Byte

from Scratchpad Offset

Y

Bus Master

RX “1”s

Master

TX Reset ?

Y

N

Master

TX Reset ?

DS28EC20

Increments

Scratchpad

Offset

Scrpad. Offset

= 11111b ?

Y

Y

N

N

N

From Figure 7,

1

st

Part

To Figure 7,

1

st

Part

To Figure 7,

3

rd

Part

From Figure 7,

3

rd

Part

See note in Write

Scratchpad flow chart

for additional details.

Bus Master RX CRC16 of

Command, Address, E/S

Byte, Data Bytes as sent

by the DS28EC20

DS28EC20: 20Kb 1-Wire EEPROM

14 of 27

Figure 7-3. Memory Function Flowchart (continued)

From Figure 7,

2

nd

Part

To Figure 7,

2

nd

Part

To Figure 7,

4

th

Part

From Figure 7,

4

th

Part

* 1-Wire idle high for t

PROG

for power

55h

Copy Scratch-

Pad ?

Bus Master TX

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

and E/S Byte

Y

N

Bus Master

RX “1”s

Master

TX Reset ?

Y

N

Y

Auth. Code

Match ?

N

DS28EC20 copies Scratch-

pad Data to Address

AA = 1

*

DS28EC20 TX “0”

Master

TX Reset ?

Master

TX Reset ?

Y

N

DS28EC20 TX “1”

N

Y

N

Copy-

Protected ?

Y

Y

N

PF = 0?

Y

N

BS = 0?

DS28EC20: 20Kb 1-Wire EEPROM

15 of 27

Figure 7-4. Memory Function Flowchart (continued)

F0h

Read Memory ?

Y

N

From Figure 7,

3

rd

Part

To Figure 7,

3

rd

Part

A5h

Extended Read

Memory?

N

Y

Bus Master TX

TA1 (T[7:0]),

TA2 (T[15:8])

DS28EC20 sets Memory

Address = (T[15:0])

DS28EC20

Increments

Address

Counte

r

Bus Master

RX “1”s

Address

< 0A3Fh?

Y

N

N

Master

TX Reset?

Y

Master

TX Reset?

Bus Master RX

Data Byte from

Memory Address

Y

N

N

Bus Master

RX “1”s

Master

TX Reset ?

Y

DS28EC20 sets Memory

Address = (T[15:0])

Bus Master TX

TA1

(

T[7:0]),

TA2 (T[15:8])

Decision

made by

DS28EC20

Decision

made by

Master

Master RX Byte from

Memory Address

Address

<0A40h

Master TX

Reset?

DS28EC20

Increments

Address

Counte

r

End of

Page?

Master TX

Reset

N

Y

N

Y

CRC OK?

Y

N

Y

N

Master RX

FFh Byte

Master RX CRC16 of

Command, Address, Data

(1

st

Pass); CRC16 of Data

(Subsequent Passes)

BS = 1

BS = 1

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27

DS28EC20P+

Mfr. #:

Manufacturer:

Maxim Integrated

Description:

EEPROM 20Kb 1-Wire EEPROM

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet