Datasheet

1-Wire Digital Thermometer with
Sequence Detect and PIO
DS28EA00
20 Maxim Integrated
DS28EA00 Tx
PRESENCE PULSE
BUS MASTER Tx
RESET PULSE
BUS MASTER Tx ROM
FUNCTION COMMAND
DS28EA00 Tx
CRC BYTE
DS28EA00 Tx
FAMILY CODE
(1 BYTE)
DS28EA00 Tx
SERIAL NUMBER
(6 BYTES)
OD = 0
MASTER Tx BIT 0
Y
OD
RESET PULSE?
YY
Y
Y
Y
Y
N
33h
READ ROM
COMMAND?
N
55h
MATCH ROM
COMMAND?
BIT 0 MATCH? BIT 0 MATCH?
N
N N
N N
N N
F0h
SEARCH ROM
COMMAND?
N
ECh
CONDITIONAL SEARCH
COMMAND?
N
Y
MASTER Tx BIT 1
MASTER Tx BIT 63
BIT 1 MATCH?
BIT 63 MATCH?
Y
Y
FROM CONTROL FUNCTIONS
FLOWCHART (FIGURE 9)
TO CONTROL FUNCTIONS
FLOWCHART (FIGURE 9)
DS28EA00 Tx BIT 0
DS28EA00 Tx BIT 0
MASTER Tx BIT 0
BIT 1 MATCH?
BIT 63 MATCH?
DS28EA00 Tx BIT 1
DS28EA00 Tx BIT 1
MASTER Tx BIT 1
DS28EA00 Tx BIT 63
DS28EA00 Tx BIT 63
MASTER Tx BIT 63
Y
BIT 0 MATCH?
N
N
N
Y
Y
DS28EA00 Tx BIT 0
DS28EA00 Tx BIT 0
MASTER Tx BIT 0
TEMPERATURE
ALARM?
N
Y
BIT 1 MATCH?
BIT 63 MATCH?
DS28EA00 Tx BIT 1
DS28EA00 Tx BIT 1
MASTER Tx BIT 1
DS28EA00 Tx BIT 63
DS28EA00 Tx BIT 63
MASTER Tx BIT 63
Y
FROM FIGURE 11b
TO FIGURE 11b
TO FIGURE 11b
FROM FIGURE 11b
Figure 11a. ROM Functions Flowchart