參數(shù)資料
型號： PCA9672PW,112
廠商： NXP Semiconductors
文件頁數(shù)： 34/36頁
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 8B 16TSSOP
產品培訓模塊： LED Controllers
I²C Bus Fundamentals
特色產品： NXP - I2C Interface
標準包裝： 96
接口： I²C
輸入/輸出數(shù)： 8
中斷輸出： 是
頻率 - 時鐘： 1MHz
電源電壓： 2.3 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 16-TSSOP
包裝： 管件
包括： POR
產品目錄頁面： 826 (CN2011-ZH PDF)
其它名稱： 568-4196-5
935282747112
PCA9672PW
PCA9672
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 27 May 2013
7 of 36
NXP Semiconductors
PCA9672
Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt and reset
7.2.1 Software Reset
The Software Reset Call allows all the devices in the I2C-bus to be reset to the power-up
state value through a specific formatted I2C-bus command. To be performed correctly, it
implies that the I2C-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 I2C-bus master.
2. The reserved General Call I2C-bus address ‘0000 000’ with the R/W bit set to 0 (write)
is sent by the I2C-bus master.
3. The PCA9672 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 I2C-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 PCA9672 acknowledges this value only. If the byte is not equal to 06h, the
PCA9672 does not acknowledge it.
If more than 1 byte of data is sent, the PCA9672 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 PCA9672 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 I2C-bus master must interpret a non-acknowledge from the PCA9672 (at any time) as
a ‘Software Reset Abort’. The PCA9672 does not initiate a reset of its registers.
The unique sequence that initiates a Software Reset is described in Figure 9.
Simple code for Software Reset:
<S> <00h> <ACK> <06h> <ACK> <P>
Fig 9.
Software Reset sequence
002aac329
0
A
S
0
SWRST Call I2C-bus address
START condition
R/W
acknowledge
from slave(s)
0
1
0
SWRST data = 06h
A
acknowledge
from slave(s)
P
PCA9672 is(are) reset.
Registers are set to default power-up values.
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