PCA9675BS NXP [NXP Semiconductors], PCA9675BS Datasheet - Page 9

• Manufacturer Part Number: PCA9675BS
• Description: Remote 16-bit I/O expander for Fm+ I2C-bus with interrupt
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9675_1
Product data sheet
7.2.1 Software Reset
7.2 Software Reset call, and Device ID addresses
Two other different addresses can be sent to the PCA9675.
The Software Reset Call allows all the devices in the I
state value through a specific formatted I
implies that the I
The Software Reset sequence is defined as following:
1. A START command is sent by the I
2. The reserved General Call I
3. The PCA9675 device(s) acknowledge(s) after seeing the General Call address
4. Once the General Call address has been sent and acknowledged, the master sends
5. Once the right byte has been sent and correctly acknowledged, the master sends a
Fig 10. General Call address
Fig 11. Device ID address
•
•
General Call address: allows to reset the PCA9675 through the I
reception of the right I
information.
Device ID address: allows to read ID information from the device (manufacturer, part
identification, revision). See
information.
is sent by the I
‘0000 0000’ (00h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to
the I
1 byte. The value of the byte must be equal to 06h.
a. The PCA9675 acknowledges this value only. If the byte is not equal to 06h, the
If more than 1 byte of data is sent, the PCA9675 does not acknowledge any more.
STOP command to end the Software Reset sequence: the PCA9675 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.
PCA9675 does not acknowledge it.
2
C-bus master.
2
C-bus is functional and that there is no device hanging the bus.
2
C-bus master.
Rev. 01 — 1 February 2007
2
C-bus sequence. See
Remote 16-bit I/O expander for Fm+ I
1
0
2
Section 7.2.2 “Device ID (PCA9675 ID field)”
C-bus address ‘0000 000’ with the R/W bit set to 0 (write)
1
0
1
0
2
C-bus master.
2
C-bus command. To be performed correctly, it
1
0
1
0
Section 7.2.1 “Software Reset”
0
0
002aac155
002aab638
0
2
0
C-bus to be reset to the power-up
R/W
R/W
0
2
C-bus with interrupt
2
C-bus upon
PCA9675
© NXP B.V. 2007. All rights reserved.
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