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| 型號： | PCA9698 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 40-bit Fm+ I2C-bus advanced I/O port with RESET, OE and INT |
| 中文描述： | 40位調(diào)頻I2C總線先進(jìn)的I / O復(fù)位，光電和INT端口 |
| 文件頁數(shù)： | 19/47頁 |
| 文件大?。?/td> | 214K |
| 代理商： | PCA9698 |
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PCA9698_2
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 19 July 2006
19 of 47
Philips Semiconductors
PCA9698
40-bit Fm+ I
2
C-bus advanced I/O port with RESET, OE and INT
7.11 SMBus Alert output (SMBALERT)
The interrupt output pin (INT) can also be used as an Alert line (SMBALERT).
The SMBALERT pins of multiple devices with this feature can be connected together to
form a wired-AND signal and can be used in conjunction with the SMBus Alert Response
Address. ‘SMBus Alert’ message is 2 bytes long and allows the master to determine
which device generated the Alert (SMBALERT going LOW).
When SMBA bit = 1 (register 2Ah, bit 4), the PCA9698 supports the SMBus Alert function
and its INT/SMBALERT pin may be connected as an SMBus Alert signal.
When a master device senses that an ‘SMBus Alert’ condition is present on the ALERT
line (SMBALERT pin of the PCA9698 and/or other devices going LOW):
It accesses the slave device(s) through the Alert Response Address (ARA)
associated with a Read Command: Start
0001 100 + R/W = 1.
If the PCA9698 is the device that generated the ‘SMBus Alert’ condition (and its
SMBA bit = 1), it will acknowledge the SMBus Alert command and respond by
transmitting its slave address on the SDA line. The 8
th
bit (LSB) of the slave address
byte will be a zero.
The device will acknowledge an ARA command only if the SMBALERT signal has
been previously asserted (SMBALERT = LOW).
If more than one device pulls its SMBALERT pin LOW, the highest priority (lowest
I
2
C-bus address) device will win communication rights via standard I
2
C-bus arbitration
during the slave address transfer.
If the PCA9698 wins the arbitration, its SMBALERT pin will become inactive (will go
HIGH) at the completion of the slave address transmission (9
th
clock pulse, NACK
phase).
If the PCA9698 loses the arbitration, its SMBALERT pin will remain active (will stay
LOW).
The master ends the sequence by sending a NACK and then STOP command.
If the SMBALERT is still LOW after transfer is complete, it means that more than one
device made the request. Another full transaction is then required.
Remark:
If the master initiates an ‘SMBus Alert’ sequence with a Write Command, none
of the slave devices acknowledge. The SMBALERT is open-drain and requires a pull-up
resistor to V
DD
.
Remark:
If the master sends an ACK after reading the I
2
C-bus slave address, the slave
device keeps sending ‘1’s until a NACK is received.
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| PCA9698BS | 制造商:NXP Semiconductors 功能描述:IC IO EXPANDER 40BIT I2C 5 制造商:NXP Semiconductors 功能描述:IC, IO EXPANDER, 40BIT, I2C, 56HVQFN 制造商:NXP Semiconductors 功能描述:IC, IO EXPANDER, 40BIT, I2C, 56HVQFN; Chip Configuration:40bit; Bus Frequency:1MHz; Interface Type:I2C, SMBus; Supply Voltage Min:2.3V; Supply Voltage Max:5.5V; Digital IC Case Style:HVQFN; No. of Pins:56; No. of I/O's:40; MSL:MSL 1 ;RoHS Compliant: Yes |
| PCA9698BS,118 | 功能描述:接口-I/O擴(kuò)展器 I2C I/O EXPANDER GP 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 |
| PCA9698BS,118-CUT TAPE | 制造商:NXP 功能描述:PCA9698 Series 40-Bit Fm I2C-Bus Advanced I/O Port w/ Reset - HVQFN 56 |
| PCA9698DGG | 功能描述:接口-I/O擴(kuò)展器 I2C I/O EXPANDER GP 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 |
| PCA9698DGG,512 | 功能描述:接口-I/O擴(kuò)展器 I2C I/O EXPANDER GP 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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