參數(shù)資料
型號(hào)： PCA9539BS,115
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 3/37頁(yè)
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C/SMBU 24HVQFN
標(biāo)準(zhǔn)包裝： 1,500
系列： *
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
11 of 37
NXP Semiconductors
PCA9539; PCA9539R
16-bit I2C-bus and SMBus low power I/O port with interrupt and reset
6.6.2 Reading the port registers
In order to read data from the PCA9539; PCA9539R, the bus master must first send the
PCA9539; PCA9539R address with the least significant bit set to a logic 0 (see Figure 5
“PCA9539; PCA9539R device address”). The command byte is sent after the address and
determines which register will be accessed. After a restart, the device address is sent
again, but this time the least significant bit is set to a logic 1. Data from the register
defined by the command byte will then be sent by the PCA9539; PCA9539R (see
Figure 9, Figure 10 and Figure 11). Data is clocked into the register on the falling edge of
the acknowledge clock pulse. After the first byte is read, additional bytes may be read but
the data will now reflect the information in the other register in the pair. For example, if you
read Input port 1, then the next byte read would be Input port 0. There is no limitation on
the number of data bytes received in one read transmission but the final byte received, the
bus master must not acknowledge the data.
Remark: Transfer can be stopped at any time by a STOP condition.
Fig 9.
Read from register
A
S
START condition
R/W
acknowledge
from slave
002aad727
A
acknowledge
from slave
SDA
A
P
acknowledge
from master
DATA (first byte)
slave address
STOP
condition
S
(repeated)
START condition
(cont.)
1101
A1 A0
1
A
1
R/W
acknowledge
from slave
slave address
at this moment master-transmitter becomes master-receiver
and slave-receiver becomes slave-transmitter
NA
no acknowledge
from master
COMMAND BYTE
1101
A1 A0
1
0
data from lower or
upper byte of register
LSB
MSB
DATA (last byte)
data from upper or
lower byte of register
LSB
MSB
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9539BS118 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
PCA9539BSHP 功能描述:I/O Expander 16 I2C 400kHz 24-HVQFN (4x4) 制造商:nxp semiconductors 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) I/O 數(shù):16 接口:I2C 中斷輸出:是 特性:POR 輸出類型:開(kāi)路漏極 電流 - 灌/拉輸出:50mA 頻率 - 時(shí)鐘:400kHz 電壓 - 電源: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)商器件封裝:24-HVQFN（4x4） 標(biāo)準(zhǔn)包裝:1
PCA9539BS-T 制造商:NXP Semiconductors 功能描述:I2C/SMBus GPIO Expander 5.5V 24-Pin HVQFN EP T/R
PCA9539D 功能描述:接口-I/O擴(kuò)展器 I2C/SMBUS 16BIT GPIO RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
PCA9539D,112 功能描述:接口-I/O擴(kuò)展器 I2C/SMBUS 16BIT GPIO RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel
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