參數(shù)資料
型號(hào)： PCA9671PW,118
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 33/33頁(yè)
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 16B 24TSSOP
特色產(chǎn)品： NXP - I2C Interface
標(biāo)準(zhǔn)包裝： 1
接口： I²C
輸入/輸出數(shù)： 16
中斷輸出： 無(wú)
頻率 - 時(shí)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： 24-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 24-TSSOP
包裝： 標(biāo)準(zhǔn)包裝
包括： POR
其它名稱： 568-8255-6
PCA9671
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 29 September 2011
9 of 33
NXP Semiconductors
PCA9671
Remote 16-bit I/O expander for Fm+ I2C-bus with 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 logic 0
(write) is sent by the I2C-bus master.
3. The PCA9671 device(s) acknowledge(s) after seeing the General Call address
‘0000 0000’ (00h) only. If the R/W bit is set to logic 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 PCA9671 acknowledges this value only. If the byte is not equal to 06h, the
PCA9671 does not acknowledge it.
If more than 1 byte of data is sent, the PCA9671 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 PCA9671 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 PCA9671 (at any time) as
a ‘Software Reset Abort’. The PCA9671 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
002aac281
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
PCA9671 is(are) reset.
Registers are set to default power-up values.
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