參數(shù)資料
型號： PCA9673D
廠商： NXP Semiconductors N.V.
元件分類： I2C/I2S
英文描述： Remote 16-bit I-O expander for Fm+ I2C-bus with interrupt and reset
封裝： PCA9673BQ<SOT815-1 (DHVQFN24)|<<http://www.nxp.com/packages/SOT815-1.html<1<Always Pb-free,;PCA9673BS<SOT616-1 (HVQFN24)|<<http://www.nxp.com/packages/SOT616-1.html<1&
文件頁數(shù)： 8/33頁
文件大小： 283K
代理商： PCA9673D
PCA9673
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 September 2011
8 of 33
NXP Semiconductors
PCA9673
Remote 16-bit I/O expander for Fm+ I
2
C-bus with interrupt and reset
7.2.1
Software Reset
The Software Reset Call allows all the devices in the I
2
C-bus to be reset to the power-up
state value through a specific formatted I
2
C-bus command. To be performed correctly, it
implies that the I
2
C-bus is functional and that there is no device hanging the bus.
The Software Reset sequence is defined as following:
1. A START command is sent by the I
2
C-bus master.
2. The reserved General Call I
2
C-bus address ‘0000 000’ with the R/W bit set to 0 (write)
is sent by the I
2
C-bus master.
3. The PCA9673 device(s) acknowledge(s) after seeing the General Call address
‘0000 0000’ (00h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to
the I
2
C-bus master.
4. Once the General Call address has been sent and acknowledged, the master sends
1 byte. The value of the byte must be equal to 06h.
a. The PCA9673 acknowledges this value only. If the byte is not equal to 06h, the
PCA9673 does not acknowledge it.
If more than 1 byte of data is sent, the PCA9673 does not acknowledge any more.
5. Once the right byte has been sent and correctly acknowledged, the master sends a
STOP command to end the Software Reset sequence: the PCA9673 then resets to
the default value (power-up value) and is ready to be addressed again within the
specified bus free time. If the master sends a Repeated START instead, no reset is
performed.
The I
2
C-bus master must interpret a non-acknowledge from the PCA9673 (at any time) as
a ‘Software Reset Abort’. The PCA9673 does not initiate a reset of its registers.
The unique sequence that initiates a Software Reset is described in
Figure 10
.
Fig 10. Software Reset sequence
002aac307
0
0
0
0
0
0
0
A
S
0
SWRST Call I
2
C-bus address
START condition
R/W
acknowledge
from slave(s)
0
0
0
0
1
1
0
0
SWRST data = 06h
A
acknowledge
from slave(s)
P
PCA9673 is(are) reset.
Registers are set to default power-up values.
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PCA9673D,112 功能描述:接口-I/O擴展器 16BIT I2C FM+ QBGPIO 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
PCA9673D,118 功能描述:接口-I/O擴展器 16BIT I2C FM+ QBGPIO 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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PCA9673DB,112 功能描述:接口-I/O擴展器 16BIT I2C FM+ QBGPIO 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
PCA9673DB,118 功能描述:接口-I/O擴展器 16BIT I2C FM+ QBGPIO 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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