參數(shù)資料
型號: PCA9539RBS,118
廠商: NXP Semiconductors
文件頁數(shù): 37/37頁
文件大?。?/td> 0K
描述: IC I/O EXPANDER I2C 16B 24HVQFN
特色產(chǎn)品: NXP - I2C Interface
標(biāo)準(zhǔn)包裝: 1
接口: I²C,SM 總線
輸入/輸出數(shù): 16
中斷輸出:
頻率 - 時鐘: 400kHz
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(zhǔn)包裝
包括: POR
其它名稱: 568-8709-6
PCA9539_PCA9539R
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 6 — 6 February 2013
9 of 37
NXP Semiconductors
PCA9539; PCA9539R
16-bit I2C-bus and SMBus low power I/O port with interrupt and reset
6.6 Bus transactions
6.6.1 Writing to the port registers
Data is transmitted to the PCA9539; PCA9539R by sending the device address and
setting the least significant bit to a logic 0 (see Figure 5 “PCA9539; PCA9539R device
address”). The command byte is sent after the address and determines which register will
receive the data following the command byte.
The eight registers within the PCA9539; PCA9539R are configured to operate as four
register pairs. The four pairs are Input ports, Output ports, Polarity inversion ports, and
Configuration ports. After sending data to one register, the next data byte will be sent to
the other register in the pair (see Figure 7 and Figure 8). For example, if the first byte is
sent to Output port 1 (register 3), then the next byte will be stored in Output port 0
(register 2). There is no limitation on the number of data bytes sent in one write
transmission. In this way, each 8-bit register may be updated independently of the other
registers.
At power-on reset, all registers return to default values.
Fig 6.
Simplified schematic of I/Os
VDD
I/O pin
output port
register data
configuration
register
DQ
CK
Q
data from
shift register
write
configuration
pulse
output port
register
DQ
CK
write pulse
polarity inversion
register
DQ
CK
data from
shift register
write polarity
pulse
input port
register
DQ
CK
read pulse
input port
register data
polarity
inversion
register data
002aad723
FF
data from
shift register
FF
Q1
Q2
VSS
to INT
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