參數(shù)資料
型號(hào)： DS2438
英文描述： Smart Battery Monitor
中文描述： 智能電池監(jiān)視器
文件頁(yè)數(shù)： 24/29頁(yè)
文件大小： 351K
代理商： DS2438
DS2438
24 of 29
SAMPLE COMMAND SEQUENCE
Table 14
Example: Assuming a single DS2438 is configured for its current accumulators to function, this sequence
allows the Bus Master to read the three current accumulators.
MASTER MODE
TX
RX
TX
TX
TX
RX
TX
TX
RX
DATA (LSB FIRST)
Reset
Presence
CCh
B8h01h
Reset
Presence
CCh
BEh01h
<9 data bytes>
COMMENTS
Reset pulse
Presence pulse
Skip ROM
Issue Recall Memory page 01h command
Reset pulse
Presence pulse
Skip ROM
Issue Read SP 01h command
Read scratchpad data and CRC. The ICA is
located in byte 04h
Reset pulse
Presence pulse
Skip ROM
Issue Recall Memory page 07h command
Reset pulse
Presence pulse
Skip ROM
Issue Read SP 07h command
Read scratchpad data and CRC. The CCA is
located in bytes 04h-05h and the DCA is located in
bytes 06h-07h.
Reset pulse
Presence pulse, done
TX
RX
TX
TX
TX
RX
TX
TX
RX
Reset
Presence
CCh
B8h07h
Reset
Presence
CCh
B8h07h
<9 data bytes>
TX
RX
Reset
Presence
I/O SIGNALING
The DS2438 requires strict protocols to insure data integrity. The protocol consists of several types of
signaling on one line: reset pulse, presence pulse, write 0, write 1, read 0, and read 1. All of these signals,
with the exception of the presence pulse, are initiated by the bus master.
The initialization sequence required to begin any communication with the DS2438 is shown in Figure 9.
A reset pulse followed by a presence pulse indicates the DS2438 is ready to send or receive data given the
correct ROM command and memory function command. The bus master transmits (Tx) a reset pulse (a
low signal for a minimum of 480
μ
s). The bus master then releases the line and goes into a receive
mode(Rx). The 1-Wire bus is pulled to a high state via the 5 k
=
pull-up resistor. After detecting the
rising edge on the I/O pin, the DS2438 waits 15-60
μ
s and then transmits the presence pulse (a low signal
for 60-240
μ
s). DS2438 data is read and written through the use of time slots to manipulate bits and a
command word to specify the transaction.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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