DS1993 Maxim, DS1993 Datasheet - Page 7

• Manufacturer Part Number: DS1993
• Description: The DS1992/DS1993 memory iButtons (hereafter referred to as DS199_) are rugged read/write data carriers that act as a localized database, easily accessible with minimal hardware
• Manufacturer: Maxim

Figure 6. MEMORY FUNCTIONS FLOW CHART
DS199x Increments
Scratchpad Offset
OF = 1
N
DS199x sets Scratchpad
Y
N
Clears (PF, OF, AA)
To Scratchpad Offset
= Scratchpad Offset
DS199x sets (E4:E0)
Master TX Data Byte
Master TX Memory
Function Command
Offset = (T4:T0) and
Bus Master TX
Bus Master TX
TA2 (T15:T8)
pad Offset =
TA1 (T7:T0)
Scratchpad
Bus Master
Bus Master
Bus Master
11111b ?
TX Data
TX Reset
TX Reset
Scratch-
Write
0FH
?
?
?
?
Y
Y
N
N
Y
Byte Written
N
Y
Partial
?
N
7 of 17
DS199x Increments
Scratchpad Offset
Y
PF = 1
Presence Pulse
N
(See Figure 9)
DS199x TX
Scratchpad Offset
Master RX Ending
Master RX Data
Bus Master RX
Bus Master RX
Offset with Data
Offset=(T4:T0)
DS199x Sets
TA2 (T15:T8)
Scratchpad
TA1 (T7:T0)
Status (E/S)
Scratchpad
Byte From
pad Offset =
Bus Master
Bus Master
11111b ?
TX Reset
RX "1"s
Scratch-
Read
AAH
?
?
N
Y
Y
Y
From Figure 6
Second Part
Second Part
DS1992/DS1993
To Figure 6