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参数资料
| 型号： | DS2408S+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 28/39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： | * |
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DS2408
34 of 39
MASTER MODE
DATA (LSB FIRST)
COMMENTS
TX
(Reset)
Reset pulse
RX
(Presence)
Presence pulse
Step 2
TX
CCh
Issue Skip ROM command
TX
F0h
Issue Read PIO Registers command
TX
8Dh
TA1, target address = 8Dh
TX
00h
TA2, target address = 008Dh
RX
84h
Read Control/Status Register and verify
TX
(Reset)
Reset pulse
RX
(Presence)
Presence pulse
Step 3
TX
CCh
Issue Skip ROM command
TX
5Ah
Issue Channel-access Write command
TX
<PIO output byte>
Write byte to PIO
TX
<inverted PIO output byte>
Write inverted byte to PIO
(—)
DS2408 updates PIO status if transmission
was OK
RX
AAh
Read for verification (AAh = success)
(—)
DS2408 samples PIO pin status
RX
<PIO pin status byte>
Read PIO pin status
TX
<PIO output byte>
Write byte to PIO (next byte)
TX
<inverted PIO output byte>
Write inverted byte to PIO (next byte)
RX
AAh
Read for verification (AAh = success)
RX
<PIO pin status byte>
Read PIO pin status
(—)
Repeat the previous 4 steps with more PIO
output data as needed in the application.
TX
(Reset)
Reset pulse
RX
(Presence)
Presence pulse
When using this communication example to send data to a remote microcontroller, as in Figure 17,
synchronization between the master and the remote microcontroller can be maintained by transmitting
data packets that begin with a length byte and end with a CRC16. See Application Note 114, section
"UNIVERSAL DATA PACKET" for details.
Example 2
Task: Read from the PIO in an endless loop.
This task is broken into the following steps:
1) Configure RSTZ as STRBoutput.
2) Verify configuration setting.
3) Read from the PIO.
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
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