參數(shù)資料
型號(hào)： PCA9674A
廠商： NXP Semiconductors N.V.
英文描述： Remote 8-bit I/O expander for Fm+ I2C-bus with interrupt
中文描述： 遠(yuǎn)程8位I / O擴(kuò)展調(diào)頻I2C總線的中斷
文件頁(yè)數(shù)： 11/34頁(yè)
文件大?。?/td> 179K
代理商： PCA9674A
PCA9674_PCA9674A_2
NXP B.V. 2006. All rights reserved.
Product data sheet
Rev. 02 — 12 October 2006
11 of 34
NXP Semiconductors
PCA9674/74A
Remote 8-bit I/O expander for Fm+ I
2
C-bus with interrupt
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 PCA9674/74A 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 PCA9674/74A acknowledges this value only. If the byte is not equal to 06h, the
PCA9674/74A does not acknowledge it.
If more than 1 byte of data is sent, the PCA9674/74A 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 PCA9674/74A 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 PCA9674/74A (at any
time) as a ‘Software Reset Abort’. The PCA9674/74A does not initiate a reset of its
registers.
The unique sequence that initiates a Software Reset is described in
Figure 11
.
Fig 10. Device ID address
R/W
002aac116
1
1
1
1
1
0
0
Fig 11. Software Reset sequence
002aac262
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
PCA9674/74A is(are) reset.
Registers are set to default power-up values.
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