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NXP Semiconductors
PCA9685
16-channel, 12-bit PWM Fm+ I 2 C-bus LED controller
7.6 Software reset
The Software Reset Call (SWRST 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 SWRST Call function is defined as the following:
1. A START command is sent by the I 2 C-bus master.
2. The reserved SWRST 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 PCA9685 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 with 1 specific value (SWRST data byte 1):
a. Byte 1 = 06h: the PCA9685 acknowledges this value only. If byte 1 is not equal to
06h, the PCA9685 does not acknowledge it.
If more than 1 byte of data is sent, the PCA9685 does not acknowledge any more.
5. Once the correct byte (SWRST data byte 1) has been sent and correctly
acknowledged, the master sends a STOP command to end the SWRST Call: the
PCA9685 then resets to the default value (power-up value) and is ready to be
addressed again within the specified bus free time (t BUF ).
General Call address
SWRST data byte 1
S
0
0
0
0
0
0
0
0
A
0
0
0
0
0
1
1
0
A
P
START condition
acknowledge
from slave
acknowledge
from slave
STOP
condition
002aac900
Fig 12. SWRST Call
The I 2 C-bus master must interpret a non-acknowledge from the PCA9685 (at any time) as
a ‘SWRST Call Abort’. The PCA9685 does not initiate a reset of its registers. This
happens only when the format of the SWRST Call sequence is not correct.
PCA9685
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 2 September 2010
? NXP B.V. 2010. All rights reserved.
27 of 51
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