pca9633 NXP Semiconductors, pca9633 Datasheet - Page 17

• Manufacturer Part Number: pca9633
• Description: Pca9633 4-bit Fm+ I2c-bus Led Driver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9633_3
Product data sheet
7.6 Software Reset
The Software Reset Call (SWRST Call) allows all the devices in the I
the power-up state value through a specific formatted I
correctly, it implies that the I
bus.
The SWRST Call function is defined as the following:
The I
a ‘SWRST Call Abort’. The PCA9633 does not initiate a reset of its registers. This
happens only when the format of the SWRST Call sequence is not correct.
1. A START command is sent by the I
2. The reserved SWRST I
3. The PCA9633 device(s) acknowledge(s) after seeing the SWRST Call address
4. Once the SWRST Call address has been sent and acknowledged, the master sends
5. Once the right 2 bytes (SWRST data byte 1 and byte 2 only) have been sent and
sent by the I
‘0000 0110’ (06h) only. If the R/W bit is set to 1 (read), no acknowledge is returned to
the I
2 bytes with 2 specific values (SWRST data byte 1 and byte 2):
a. Byte 1 = A5h: the PCA9633 acknowledges this value only. If byte 1 is not equal to
b. Byte 2 = 5Ah: the PCA9633 acknowledges this value only. If byte 2 is not equal to
If more than 2 bytes of data are sent, the PCA9633 does not acknowledge any more.
correctly acknowledged, the master sends a STOP command to end the SWRST Call:
the PCA9633 then resets to the default value (power-up value) and is ready to be
addressed again within the specified bus free time (t
2
C-bus master must interpret a non-acknowledge from the PCA9633 (at any time) as
A5h, the PCA9633 does not acknowledge it.
5Ah, then the PCA9633 does not acknowledge it.
2
C-bus master.
2
C-bus master.
Rev. 03 — 20 December 2006
2
2
C-bus address ‘0000 011’ with the R/W bit set to 0 (write) is
C-bus is functional and that there is no device hanging the
2
C-bus master.
2
C-bus command. To be performed
BUF
4-bit Fm+ I
).
2
C-bus to be reset to
PCA9633
2
© NXP B.V. 2006. All rights reserved.
C-bus LED driver
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