參數(shù)資料
型號(hào)： PCF8575C
廠商： NXP Semiconductors N.V.
英文描述： Remote 16-bit I/O expander for I2C-bus
中文描述： 遠(yuǎn)程16位I / O擴(kuò)展I2C總線
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 107K
代理商： PCF8575C
1999 Aug 05
6
Philips Semiconductors
Product specification
Remote 16-bit I/O expander for I
2
C-bus
PCF8575C
6
FUNCTIONAL DESCRIPTION
6.1
Quasi-bidirectional I/Os
The 16 ports (see Fig.3) are entirely independent and can be used either as input or output ports. Input data is transferred
from the ports to the microcontroller in the READ mode (see Fig.6). Output data is transmitted to the ports in the WRITE
mode (see Fig.5).
This quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction.
At power-on all the I/Os are in 3-state mode. The strong pull-up to V
DD
(I
OHt
) allows a fast rising edge into a heavily
loaded output. This strong pull-up turns on when the output is written HIGH, and is switched off by the negative edge of
SCL. After this short period the output is in 3-state mode. The I/O should be written HIGH before being used as an input.
After power-on as all the I/Os are set to 3-state all of them can be used as inputs. Any change in setting of the I/Os as
either inputs or outputs can be done with the write mode. Warning: If a HIGH is applied to an I/O which has been written
earlier to LOW, a large current (I
OL
) will flow to V
SS
(see Chapter 10; note 3).
6.2
Addressing
Figures 4, 5 and 6 show the address and timing diagrams. Before any data is transmitted or received the master must
send the address of the receiver via the SDA line. The first byte transmitted after the START condition carries the address
of the slave device and the read/write bit. The address of the slave device must not be changed between the START and
the STOP conditions. The PCF8575C acts as a slave receiver or a slave transmitter.
handbook, full pagewidth
MGS632
D
Q
CI
CI
S
FF
D
IOL
IOHt
Q
S
FF
to interrupt
logic
VSS
VDD
P00 to P07
P10 to 17
write pulse
data from
shift register
power-on
reset
read pulse
data to
shift register
Fig.3 Simplified schematic diagram of each I/O.
MGL541
handbook, halfpage
S
0
1
0
0
A2
A1
A0 R/W
A
slave address
Fig.4 Byte containing the slave address and the R/W bits.
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PCF8575CDBG4 功能描述:接口-I/O擴(kuò)展器 Rem 16B I2C & SMBus I/O Expander 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
PCF8575CDBQR 功能描述:接口-I/O擴(kuò)展器 Remote 16-Bit I2C & SMBus I/O Expander 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
PCF8575CDBQRE4 功能描述:接口-I/O擴(kuò)展器 Remote 16-Bit I2C & SMBus I/O Expander 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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