参数资料
型号: DS2408S+T&R
厂商: Maxim Integrated Products
文件页数: 27/39页
文件大小: 0K
描述: IC SWITCH 8-CHAN ADDRESS 16SOIC
标准包装: 2,500
接口: 1 线
输入/输出数: 8
中断输出: *
电源电压: 2.8 V ~ 5.25 V
工作温度: *
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
供应商设备封装: 16-SOIC
包装: 带卷 (TR)
包括: *
DS2408
33 of 39
Channel-Access Write (Success)
RST
PD
Select
CAW <new state>, <new state\>
AAh, <read back>
Channel-Access Write (Fail New State)
RST
PD
Select
CAW <new state>, <invalid>
FF loop
Write Conditional Search Register (Success)
RST
PD
Select
WCS TA
<data>
FF loop
Write Conditional Search Register (Fail Address)
RST
PD
Select
WCS TA
FF loop
Reset Activity Latches (Cannot Fail)
RST
PD
Select
RAL
AA loop
COMMUNICATION EXAMPLES
The examples in this section demonstrate the use of ROM and control functions in typical situations. The
first two examples are related to Figure 17. They show how to write to the PIO with readback for
verification or for receiving an immediate response (example 1) and how to read from the PIO in an
endless loop (example 2). The third example assumes a network of multiple DS2408s where each of the
devices is connected to 8 pushbuttons, as in Figure 21.
Example 1
Task: Write to the PIO with readback for verification or for receiving an immediate response.
This task is broken into the following steps:
1) Configure RSTZ as STRB output.
2) Verify configuration setting.
3) Write to the PIO and read back the response.
With only a single DS2408 connected to the bus master, the communication is as follows:
MASTER MODE
DATA (LSB FIRST)
COMMENTS
Step 1
TX
(Reset)
Reset pulse
RX
(Presence)
Presence pulse
TX
CCh
Issue Skip ROM command
TX
CCh
Issue Write Conditional Search Register
command
TX
8Dh
TA1, target address = 8Dh
TX
00h
TA2, target address = 008Dh
TX
04h
Write byte to Control/Status Register
Loop
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