Datasheet

DS28EC20: 20Kb 1-Wire EEPROM
19 of 27
Figure 9-1. ROM Functions Flowchart
Y
From Figure 9,
2
nd
Part
To Memory Functions
Flow Chart (
Figure 7)
Master TX Bit 0
Master TX Bit 63
Master TX Bit 1
RC = 1
DS28EC20 TX
CRC Byte
DS28EC20 TX
Serial Number
(6 Bytes)
DS28EC20 TX
Family Code
(1 Byte)
Bit 0
Match?
Y
N
Bit 1
Match?
Y
N
Bit 63
Match?
Y
N
DS28EC20 TX Bit 0
DS28EC20 TX Bit 0
Master TX Bit 0
DS28EC20 TX Bit 1
DS28EC20 TX Bit 1
Master TX Bit 1
DS28EC20 TX Bit 63
DS28EC20 TX Bit 63
Master TX Bit 63
RC = 1
Bit 0
Match?
Y
N
Bit 1
Match?
Y
N
Bit 63
Match?
Y
N
To Figure 9,
2
nd
Part
RC = 0
RC = 0
RC = 0
Y
Y
Y
N
F0h
Search ROM
Command?
N
55h
Match ROM
Command?
N
33h
Read ROM
Command?
To Figure 9,
2
nd
Part
From Memory Functions
Flow Chart (Figure 7)
Bus Master TX ROM
Function Command
DS28EC20 TX
Presence Pulse
OD
Reset Pulse?
N
Y
OD = 0
Bus Master TX
Reset Pulse
From
Figure 9, 2
nd
Part
RC = 0
N
CCh
Skip ROM
Command?