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| 型號： | SMARTPSE24-KIT |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL REF 24PORT SPI/UART |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 電源管理，以太網(wǎng)供電（POE），PSE |
| 已用 IC / 零件： | Si3452，Si3482，Si3500 |
| 已供物品： | 板，線纜，CD |
| 相關(guān)產(chǎn)品： | SI3482-A01-GM-ND - IC CTLR POE 24-48PORT PSE 24-QFN 336-1830-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1835-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1829-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1831-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1834-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1844-5-ND - IC POE SWITCH PWR OVER LAN 20QFN 336-1833-5-ND - IC POE CONTROLLER MIDSPAN 40QFN 336-1832-5-ND - IC POE CONTROLLER MIDSPAN 40QFN |
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Si3452
16
Rev. 1.3
4.8.1. Address Pins
Pins with the same name must be externally connected and then tied high or low via a weak (10 k
) pull up or pull
down to establish the device address at power up. The Si3452 powers up in either Auto mode or Shutdown mode
depending on the ordering part number. For more information, see "12. Ordering Guide" on page 33.
4.8.2. Address Format
The address byte of the I2C communication protocol has the following format:
AD3, AD2, AD1, and AD0 are the pin-selected address bits (pull up = 1; pull down = 0). For the R/W bit, see
Figure 6. The device will also respond to the global address, 0x30. The Si3452 does not support bus arbitration;
so, a global read command will generally give an invalid result. Global writes can be useful for initialization as well
as for shutting down low-priority ports. Table 16 lists the valid device addresses:
Table 14. Address Pin Assignments
Pin #
Pin Name
21
AD3
24
AD3
25
AD2
26
AD2
27
AD1
28
AD0
34
AD0
36
AD1
Table 15. I2C Address Byte Protocol
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
1
0
AD3
AD2
AD1
AD0
R/W
Table 16. Address Selection
AD3
AD2
AD1
AD0
Address
Valid
0000
0x20
Y
0001
0x21
Y
0010
—
N
0011
—
N
0100
0x24
Y
0101
0x25
Y
0110
—
N
0111
—
N
1000
0x28
Y
1001
0x29
Y
1010
0x2A
Y
1011
0x2B
Y
1100
0x2C
Y
1101
0x2D
Y
1110
0x2E
Y
1111
0x2F
Y
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