DS28E04-100 Maxim, DS28E04-100 Datasheet - Page 35

• Manufacturer Part Number: DS28E04-100
• Description: The DS28E04-100 is a 4096-bit, 1-Wire® EEPROM chip with seven address inputs
• Manufacturer: Maxim

PIO ACCESS READ EXAMPLE
Read the state of the PIOs 32 times.
With only a single DS28E04-100 connected to the bus master, the communication looks like this:
The inverted CRC16 is transmitted after 32 bytes of PIO data.
PIO ACCESS WRITE EXAMPLE
Set both PIOs to 0 and then to 1. Both PIOs are pulled high to V
With only a single DS28E04-100 connected to the bus master, the communication looks like this:
MASTER MODE
MASTER MODE
RX
RX
RX
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
DATA (LSB FIRST)
DATA (LSB FIRST)
<2 bytes CRC16\>
<32 data bytes>
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
FCh
AAh
FCh
AAh
F5h
5Ah
03h
FFh
00h
FFh
35 of 37
CC
or V
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “PIO Access Read” command
Read 32 PIO samples
Read CRC to check for data integrity
Reset pulse
Presence pulse
Reset pulse
Presence pulse
Issue “Skip ROM” command
Issue “PIO Access Write” command
Write new PIO output state
Write inverted new PIO output state
Read confirmation byte
Read new PIO pin status
Write new PIO output state
Write inverted new PIO output state
Read confirmation byte
Read new PIO pin status
Reset pulse
Presence pulse
PUP
by a resistor.
COMMENTS
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