Datasheet

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