DS28EA00U+

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P29

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

Maxim Integrated 13

BUS MASTER Tx CONTROL

FUNCTION COMMAND

DS28EA00 SETS

BYTE ADDRESS = 2

4Eh

WRITE SCRATCHPAD?

N

Y

Y

N

N

Y

N

MASTER Tx RESET?

BYTE

ADDRESS = 4?

MASTER Tx RESET?

MASTER Tx DATA

BYTE TO SCRATCHPAD

DS28EA00 INCREMENTS

BYTE ADDRESS

FROM ROM FUNCTIONS

FLOWCHART (FIGURE 11)

TO ROM FUNCTIONS

FLOWCHART (FIGURE 11)

Y

TO FIGURE 9b

FROM FIGURE 9b

DS28EA00 SETS

BYTE ADDRESS = 0

DS28EA00 STARTS

COPY TO EEPROM

BEh

READ SCRATCHPAD?

N

Y

MASTER Rx BYTE

FROM SCRATCHPAD

MASTER ACTIVATES STRONG

PULLUP FOR t

PROG

MASTER DEACTIVATES

STRONG PULLUP

DS28EA00 COPIES

SCRATCHPAD DATA TO EEPROM

48h

COPY SCRATCHPAD?

MASTER DECISION.

THE MASTER NEEDS TO

KNOW WHETHER V

DD

POWER IS AVAILABLE.

N

Y

Y

NY

V

DD

POWERED?

COPY

COMPLETED?

MASTER Rx "0"s

MASTER Rx "1"s

Y

N

N

MASTER Tx RESET?

BYTE

ADDRESS = 7?

DS28EA00 INCREMENTS

BYTE ADDRESS

MASTER Rx 8-BIT

CRC OF DATA

N

Y

N

MASTER Tx RESET?

Y

MASTER Rx "1"s

N

MASTER Tx RESET?

Y

Figure 9a. Control Function Flowchart

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

14 Maxim Integrated

TO FIGURE 9c

FROM FIGURE 9c

FROM FIGURE 9a

TO FIGURE 9a

DS28EA00 STARTS

TEMPERATURE CONVERSION

MASTER ACTIVATES STRONG

PULLUP FOR t

CONV

MASTER DEACTIVATES

STRONG PULLUP

DS28EA00 CONVERTS

TEMPERATURE

44h

CONVERT

TEMPERATURE

N

Y

Y

B4h

READ POWER

MODE?

N

Y

N

NY

NY

V

DD

POWERED?

V

DD

POWERED?

CONVERSION

COMPLETED?

MASTER Rx "0"s

MASTER Rx "1"s MASTER Rx "0"s

MASTER Rx "1"s

N

MASTER Tx RESET?

Y

N

MASTER Tx RESET?

Y

MASTER DECISION.

THE MASTER NEEDS TO

KNOW WHETHER V

DD

POWER IS AVAILABLE.

Figure 9b. Control Function Flowchart

1-Wire Digital Thermometer with

Sequence Detect and PIO

DS28EA00

Maxim Integrated 15

TO FIGURE 9d

FROM FIGURE 9d

FROM FIGURE 9b

TO FIGURE 9b

DS28EA00 STARTS RECALL

EEPROM TO SCRATCHPAD

DS28EA00 SAMPLES

PIO PIN

*

*SEE THE COMMAND DESCRIPTION FOR THE EXACT TIMING OF THE PIO PIN SAMPLING AND UPDATING.

DS28EA00 UPDATES

PIO

*

*

BUS MASTER Tx NEW PIO

OUTPUT DATA BYTE

BUS MASTER Tx INVERTED NEW

PIO OUTPUT DATA BYTE

BUS MASTER Rx

PIO PIN STATUS

B8h

RECALL EEPROM?

N

Y

F5h

PIO ACCESS

READ?

A5h

PIO ACCESS

WRITE?

N

N

Y

RECALL

COMPLETED?

Y

N

N

MASTER Rx "0"s

MASTER Rx "1"s

MASTER Rx "1"s

N

MASTER Tx RESET?

Y N

N

Y

MASTER Tx RESET?

N

MASTER Tx RESET?

Y

TRANSMISSION

OK?

MASTER Tx RESET?

BUS MASTER Rx

CONFIRMATION AAh

BUS MASTER Rx "1"s

BUS MASTER Rx

PIO PIN STATUS

DS28EA00 SAMPLES

PIO PIN

Y

Y

Y

Figure 9c. Control Function Flowchart

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P29

DS28EA00U+

Mfr. #:

Manufacturer:

Maxim Integrated

Description:

Board Mount Temperature Sensors 1-Wire Digital Therm w/Sequence Dtct-PIO

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

DS28EA00U+