參數(shù)資料
型號(hào)： PCA9675DK
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt
中文描述： 18 I/O, PIA-GENERAL PURPOSE, PDSO24
封裝： 3.90 MM, 0.635 MM PITCH, PLASTIC, MO-137, SOT556-1, SSOP-24
文件頁(yè)數(shù)： 10/34頁(yè)
文件大?。?/td> 185K
代理商： PCA9675DK
PCA9675_1
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 01 — 1 February 2007
10 of 34
NXP Semiconductors
PCA9675
Remote 16-bit I/O expander for Fm+ I
2
C-bus with interrupt
The I
2
C-bus master must interpret a non-acknowledge from the PCA9675 (at any time) as
a ‘Software Reset Abort’. The PCA9675 does not initiate a reset of its registers.
The unique sequence that initiates a Software Reset is described in
Figure 12
.
7.2.2
Device ID (PCA9675 ID field)
The Device ID field is a 3-byte read-only (24 bits) word giving the following information:
8 bits with the manufacturer name, unique per manufacturer (for example,
NXP Semiconductors).
13 bits with the part identification, assigned by manufacturer, the 7 MSBs with the
category ID and the 6 LSBs with the feature ID (for example, PCA9675 16-bit
quasi-output I/O expander).
3 bits with the die revision, assigned by manufacturer (for example, Rev X).
The Device ID is read-only, hard wired in the device and can be accessed as follows:
1. START command
2. The master sends the Reserved Device ID I
2
C-bus address ‘1111 100’ with the R/W
bit set to 0 (write).
3. The master sends the I
2
C-bus slave address of the slave device it needs to identify.
The LSB is a ‘Don’t care’ value. Only one device must acknowledge this byte (the one
that has the I
2
C-bus slave address).
4. The master sends a Re-START command.
Remark:
A STOP command followed by a START command will reset the slave state
machine and the Device ID read cannot be performed.
Remark:
A STOP command or a Re-START command followed by an access to
another slave device will reset the slave state machine and the Device ID read cannot
be performed.
5. The master sends the Reserved Device ID I
2
C-bus address ‘1111 100’ with the R/W
bit set to 1 (read).
6. The device ID read can be done, starting with the 8 manufacturer bits (first byte +
4 MSB of the second byte), followed by the 13 part identification bits and then the 3
die revision bits (3 LSB of the third byte).
7. The master ends the reading sequence by NACKing the last byte, thus resetting the
slave device state machine and allowing the master to send the STOP command.
Fig 12. Software Reset sequence
002aac156
0
0
0
0
0
0
0
A
S
0
SWRST Call I
2
C 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
PCA9675 is(are) reset.
Registers are set to default power-up values.
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PCA9675PW,112 功能描述:接口-I/O擴(kuò)展器 16-BIT I2C FM+ QB 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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