DS1961S-F5 Maxim Integrated Products, DS1961S-F5 Datasheet - Page 27

• Manufacturer Part Number: DS1961S-F5
• Description: DS1961S 1kb Protected EePROM Ibutton With SHA-1 Engine
• Manufacturer: Maxim Integrated Products

Figure 9-1. ROM FUNCTIONS FLOW CHART
Bus Master TX ROM
Function Command
Serial Number
DS1961S TX
DS1961S TX
DS1961S TX
Command ?
Family Code
Read ROM
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 ?
DS1961S TX
Reset Pulse
Y
N
N
N
To Memory Functions
Flow Chart (Figure 7)
N
OD
27 of 36
N
N
N
DS1961S TX Bit 63
DS1961S TX Bit 63
DS1961S TX Bit 0
DS1961S TX Bit 0
DS1961S TX Bit 1
DS1961S 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, 2nd Part
RC = 0
CCh
Y
From Figure 9
To Figure 9
To Figure 9
2nd Part
2nd Part
2nd Part
N