DS1921H/Z Maxim Integrated Products, DS1921H/Z Datasheet - Page 33

• Manufacturer Part Number: DS1921H/Z
• Description: High Resolution Thermochron Ibutton Range H
• Manufacturer: Maxim Integrated Products

STEP 2
Set the EMCLR bit to 1, enable the RTC and then execute the Clear Memory command. This results in
the following data to be written to the Status Register:
With only a single DS1921H/Z connected to the bus master, the communication of step 2 is as follows:
Address:
Data:
MASTER MODE
RX
RX
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
TX
20Eh
40h
DATA (LSB FIRST)
(Presence)
(Presence)
(Presence)
(Presence)
(Presence)
(Reset)
(Reset)
(Reset)
(Reset)
(Reset)
CCh
CCh
CCh
CCh
AAh
0Eh
0Eh
0Eh
0Eh
0Eh
3Ch
0Fh
02h
40h
02h
40h
55h
02h
33 of 40
COMMENTS
Reset pulse (480µs to 960µs)
Presence pulse
Issue Skip ROM command
Issue Write Scratchpad command
TA1, beginning offset = 0Eh
TA2, address = 020Eh
Write status byte to scratchpad
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Read Scratchpad command
Read TA1, beginning offset = 0Eh
Read TA2, address = 020Eh
Read E/S, ending offset = 0Eh, flags = 0h
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Copy Scratchpad command
TA1
TA2
E/S
Reset pulse
Presence pulse
Issue Skip ROM command
Issue Clear Memory command
Reset pulse
Presence pulse
(AUTHORIZATION CODE)