參數(shù)資料
型號(hào)： PCA9671
廠商： NXP Semiconductors N.V.
英文描述： Remote 16-bit I/O expander for Fm+ I2C-bus with reset
中文描述： 遠(yuǎn)程16位I / O擴(kuò)展調(diào)頻的I2C總線與復(fù)位
文件頁(yè)數(shù)： 16/34頁(yè)
文件大?。?/td> 183K
代理商： PCA9671
PCA9671_1
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 20 December 2006
16 of 34
NXP Semiconductors
PCA9671
Remote 16-bit I/O expander for Fm+ I
2
C-bus with reset
8.4 Power-on reset
When power is applied to V
DD
, an internal Power-On Reset (POR) holds the PCA9671 in
a reset condition until V
DD
has reached V
POR
. At that point, the reset condition is released
and the PCA9671 registers and I
2
C-bus/SMBus state machine will initialize to their default
states. Thereafter V
DD
must be lowered below 0.2 V to reset the device.
8.5 RESET input
A reset can be accomplished by holding the RESET pin LOW for a minimum of t
w(rst)
. The
PCA9671 registers and I
2
C-bus state machine will be held in their default state until the
RESET input is once again HIGH.
9.
Characteristics of the I
2
C-bus
The I
2
C-bus is for 2-way, 2-line communication between different ICs or modules. The two
lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be
connected to a positive supply via a pull-up resistor when connected to the output stages
of a device. Data transfer may be initiated only when the bus is not busy.
9.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain
stable during the HIGH period of the clock pulse as changes in the data line at this time
will be interpreted as control signals (see
Figure 19
).
9.1.1
START and STOP conditions
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW
transition of the data line while the clock is HIGH is defined as the START condition (S). A
LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the STOP
condition (P) (see
Figure 20
).
Fig 19. Bit transfer
mba607
data line
stable;
data valid
change
of data
allowed
SDA
SCL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCA9671BQ,118 功能描述:接口-I/O擴(kuò)展器 REMOTE 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
PCA9671BQ-T 功能描述:接口-I/O擴(kuò)展器 REMOTE 16BIT GPIO FM+I2C-RESET 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
PCA9671BS,118 功能描述:接口-I/O擴(kuò)展器 REMOTE 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
PCA9671BS-T 功能描述:接口-I/O擴(kuò)展器 REMOTE 16BIT GPIO FM+I2C-RESET 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
PCA9671D 功能描述:接口-I/O擴(kuò)展器 16-BIT I2C FM+ QB GPIO RST PU 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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