DS1977-F5- MAXIM [Maxim Integrated Products], DS1977-F5- Datasheet - Page 17

• Manufacturer Part Number: DS1977-F5-
• Description: Password-Protected 32KB EEPROM iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 9-1. ROM FUNCTIONS FLOW CHART
Bus Master TX ROM
Function Command
Serial Number
Family Code
Command ?
Read ROM
DS1977 TX
DS1977 TX
DS1977 TX
CRC Byte
(6 Bytes)
(1 Byte)
RC = 0
33h
From Memory Functions
Flow Chart (Figure 9)
Y
N
Master TX Bit 63
Master TX Bit 0
Master TX Bit 1
Command ?
Match ROM
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 ?
DS1977 TX
Reset Pulse
Y
N
N
N
To Memory Functions
Flow Chart (Figure 7)
N
OD
N
N
N
17 of 29
DS1977 TX Bit 63
DS1977 TX Bit 63
DS1977 TX Bit 0
DS1977 TX Bit 0
DS1977 TX Bit 1
DS1977 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
OD = 0
Y
Y
Y
Y
N
Command ?
Skip ROM
From Figure 9, 2
RC = 0
CCh
Y
From Figure 9
To Figure 9
To Figure 9
2
2
2
nd
nd
nd
Part
Part
Part
nd
N
Part