DS2434 Dallas Semiconducotr, DS2434 Datasheet - Page 11

• Manufacturer Part Number: DS2434
• Description: Battery Identification Chip
• Manufacturer: Dallas Semiconducotr

MEMORY FUNCTION EXAMPLE Table 2
Example: Bus Master writes 24 bytes of data to DS2434 scratchpad, then copies to it to NV1.
MEMORY FUNCTION EXAMPLE Table 3
Example: Bus Master initiates temperature conversion, then reads temperature.
1-WIRE BUS SYSTEM
The DS2434 1-Wire bus is a system which has a single bus master and one slave. The DS2434 behaves as
a slave. The DS2434 is not able to be multidropped, unlike other 1-Wire devices from Dallas
Semiconductor.
The discussion of this bus system is broken down into three topics: hardware configuration, transaction
sequence, and 1-Wire signaling (signal types and timing).
MASTER MODE
MASTER MODE
RX
RX
RX
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
DATA (LSB FIRST)
DATA (LSB FIRST)
<busy indicator>
<24 data bytes>
<1 data byte>
<1 data byte>
<24 bytes>
Presence
Presence
Presence
Presence
Presence
Presence
Presence
Presence
Reset
Reset
Reset
Reset
Reset
Reset
Reset
Reset
D2h
B2h
B2h
17h
00h
11h
00h
22h
62h
61h
11 of 20
Reset pulse (480-960 s)
Presence pulse
Issue "write scratchpad" command
Start address
Write 24 bytes of data to scratchpad
Reset pulse
Presence pulse
Issue "read scratchpad" command
Start address
Read scratchpad data and verify
Reset pulse
Presence pulse
Issue "copy SP1 to NV1" command
Wait until NVB in status register=0 (10 ms typical)
Reset pulse
Presence pulse, done
Reset pulse (480-960 s)
Presence pulse
Issue "convert T" command
Reset pulse
Presence pulse
Issue "read registers" command; begin loop
Status register address
Read status register and loop until TB=0
Reset pulse
Presence pulse
Issue "read registers" command
Temperature register address
Read temperature register
Reset pulse
Presence pulse, done
COMMENTS
COMMENTS
DS2434