參數(shù)資料
型號: PCA9671BS,118
廠商: NXP Semiconductors
文件頁數(shù): 30/33頁
文件大小: 0K
描述: IC I/O EXPANDER I2C 16B 24HVQFN
特色產(chǎn)品: NXP - I2C Interface
標(biāo)準包裝: 1
接口: I²C
輸入/輸出數(shù): 16
中斷輸出:
頻率 - 時鐘: 1MHz
電源電壓: 2.3 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 24-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 24-HVQFN(4x4)
包裝: 標(biāo)準包裝
包括: POR
其它名稱: 568-8718-6
PCA9671
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 29 September 2011
6 of 33
NXP Semiconductors
PCA9671
Remote 16-bit I/O expander for Fm+ I2C-bus with reset
7.
Functional description
7.1 Device address
Following a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address of the
PCA9671 is shown in Figure 7. Slave address pins AD2, AD1, and AD0 choose 1 of
64 slave addresses. To conserve power, no internal pull-up resistors are incorporated on
AD2, AD1, and AD0. Address values depending on AD2, AD1, and AD0 can be found in
Remark: The General Call address (0000 0000) and the Device ID address (1111 100X)
are reserved and cannot be used as device address. Failure to follow this requirement will
cause the PCA9671 not to acknowledge.
Remark: Reserved I2C-bus addresses must be used with caution since they can interfere
with:
“reserved for future use” I2C-bus addresses (0000 011, 1111 101, 1111 110, 1111 111)
slave devices that use the 10-bit addressing scheme (1111 0xx)
High speed mode (Hs-mode) master code (0000 1xx)
The last bit of the first byte defines the operation to be performed. When set to logic 1 a
read is selected, while a logic 0 selects a write operation.
When AD2, AD1 and AD0 are held to VDD or VSS, the same address as the PCF8575 is
applied.
7.1.1 Address maps
Fig 7.
PCA9671 address
R/W
002aab636
A6
A5
A4
A3
A2
A1
A0
programmable
slave address
Table 3.
PCA9671 address map
AD2
AD1
AD0
A6
A5
A4
A3
A2
A1
A0
Address (hex)
VSS
SCL
VSS
0
01000
020h
VSS
SCL
VDD
0
01000
122h
VSS
SDA
VSS
0
01001
024h
VSS
SDA
VDD
0
01001
126h
VDD
SCL
VSS
0
01010
028h
VDD
SCL
VDD
0
01010
12Ah
VDD
SDA
VSS
0
01011
02Ch
VDD
SDA
VDD
0
01011
12Eh
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