DS1972-F3 MAXIM [Maxim Integrated Products], DS1972-F3 Datasheet - Page 9

• Manufacturer Part Number: DS1972-F3
• Description: 1024-Bit EEPROM iButton
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 7-1. Memory Function Flow Chart
Bus Master
RX “1”s
Increments
DS1972
E2:E0
TA1 (T7:T0), TA2 (T15:T8)
N
N
Data Bytes as they were
Bus Master TX Memory
of Command, Address,
sent by the bus master
Master TX Data Byte
Function Command
Sets E2:E0 = T2:T0
DS1972 TX CRC16
Bus Master TX
Write Scratch-
To Scratchpad
Clears AA = 0
DS1972 sets
TX Reset ?
TX Reset ?
Sets PF = 1
Master
Master
PF = 0
E2:E0
T2:T0
pad ?
= 7 ?
= 0 ?
0Fh
Flow Chart (Figure 9)
To ROM Functions
N
Y
Y
Y
Y
9 of 23
N
Y
N
From ROM Functions
Flow Chart (Figure 9)
Applies only if the
memory area is not
protected.
If write-protected, then
the DS1972 copies the
data byte from the tar-
get address into the SP.
If in EPROM mode,
then the DS1972 loads
the bitwise logical AND
of the transmitted byte
and the data byte from
the targeted address
into the SP.
From Figure 7
To Figure 7
2
2
nd
nd
Part
Part