pca9671 NXP Semiconductors, pca9671 Datasheet - Page 9

• Manufacturer Part Number: pca9671
• Description: Remote 16-bit I/o Expander For Fm+ I2c-bus With Reset
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9671_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 PCA9671.
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 PCA9671 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 PCA9671 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.
(write) is sent by the I
‘0000 0000’ (00h) only. If the R/W bit is set to logic 1 (read), no acknowledge is
returned to the I
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
If more than 1 byte of data is sent, the PCA9671 does not acknowledge any more.
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.
PCA9671 does not acknowledge it.
2
C-bus is functional and that there is no device hanging the bus.
2
Rev. 01 — 20 December 2006
C-bus master.
2
2
C-bus master.
C-bus sequence. See
1
0
Remote 16-bit I/O expander for Fm+ I
2
Section 7.2.2 “Device ID (PCA9671 ID field)”
C-bus address ‘0000 000’ with the R/W bit set to logic 0
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 upon
PCA9671
© NXP B.V. 2006. All rights reserved.
2
C-bus with reset
for more
for more
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