DS1977-F5# Maxim Integrated Products, DS1977-F5# Datasheet - Page 17

• Manufacturer Part Number: DS1977-F5#
• Description: IBUTTON EEPROM 32KBit F5
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1977-F5#

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 32KB
• Memory Type: EEPROM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 9-1. ROM FUNCTIONS FLOW CHART
Bus Master TX ROM
Function Command
Serial Number
Command ?
Family Code
DS1977 TX
DS1977 TX
DS1977 TX
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 ?
DS1977 TX
Reset Pulse
Y
N
N
N
To Memory Functions
N
Flow Chart (Figure 7)
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
DS1977