DS28E04-100 Maxim, DS28E04-100 Datasheet - Page 25

• Manufacturer Part Number: DS28E04-100
• Description: The DS28E04-100 is a 4096-bit, 1-Wire® EEPROM chip with seven address inputs
• Manufacturer: Maxim

Figure 14-1. ROM Functions Flow Chart
Bus Master TX ROM
Function Command
Serial Number
DS28E04 TX
DS28E04 TX
DS28E04 TX
DS28E04 TX
DS28E04 TX
Family Code
Ext. Address
Command?
Read ROM
CRC Byte
"0" (1 bit)
(40 bits)
(1 Byte)
The CRC is hard-coded assuming
all external address bits are 1's.
RC = 0
(7 bits)
33h
From Memory Functions
Flow Chart (Figure 9)
Y
N
Master TX Bit 63
Master TX Bit 0
Master TX Bit 1
Match ROM
Command?
Match?
Match?
Match?
RC = 0
RC = 1
Bit 63
Bit 0
Bit 1
55h
Y
Y
Y
Y
Presence Pulse
Bus Master TX
Reset Pulse?
DS28E04 TX
Reset Pulse
Y
N
N
N
N
OD
25 of 37
N
N
N
To Memory Functions
Flow Chart (Figure 9)
DS28E04
DS28E04
DS28E04 TX Bit 0
DS28E04 TX Bit 0
DS28E04 TX Bit 1
DS28E04 TX Bit 1
Master TX Bit 63
Master TX Bit 0
Master TX Bit 1
Search ROM
Command?
Match?
Match?
Match?
RC = 0
RC = 1
N
Bit 63
Bit 0
Bit 1
F0h
TX Bit 63
TX Bit 63
OD = 0
Y
Y
Y
Y
N
N
N
N
N
DS28E04
DS28E04
DS28E04 TX Bit 0
DS28E04 TX Bit 0
DS28E04 TX Bit 1
DS28E04 TX Bit 1
Master TX Bit 63
Master TX Bit 1
Master TX Bit 0
Cond. Search
Command?
CSR = 1?
From Figure 14, 2
Match?
Match?
Match?
RC = 1
RC = 0
Bit 63
Bit 0
Bit 1
ECh
TX Bit 63
TX Bit 63
Y
From Figure 14
Y
Y
Y
Y
To Figure 14
To Figure 14
2
2
2
nd
nd
nd
Part
Part
Part
nd
N
Part