PCA9541PW View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
PCA9541PW Datasheet PDF : 30 Pages
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Philips Semiconductors
2-to-1 I2C master selector with interrupt logic and reset
Product data sheet
PCA9541
Register 1: Control Register (B1B0 = 01)
x stands for 0 or 1 and is applied to the master that reads or writes in the Control Register explained below
The Control Register described below is identical for both the masters. Nevertheless, there are physically 2 internal Control Registers, one for
each upstream channel.
When master 0 reads/writes in this register, the internal Control Register 0 will be accessed.
When master 1 reads/writes in this register, the internal Control Register 1 will be accessed.
BIT
7
6
5
4
3
2
1
0
SYMBOL
NTESTON
TESTON
0
BUSINIT
NBUSON
BUSON
NMYBUS
MYBUS
Table 3. Register 1
BIT
SYMBOL
READ/
WRITE
0 MYBUS
R/W
1 NMYBUS
R only
2 BUSON
R/W
3 NBUSON
4 BUSINIT
5 NOT USED
6 TESTON
7 NTESTON
R only
R/W
R only
R/W
R only
DEFAULT
DESCRIPTION
See
Table 6
See
Table 6
See
Table 6
See
Table 6
0
0
0
0
MYBUS bit along with the NMYBUS bit decides which upstream channel is connected
to the downstream channel
See Table 4
NMYBUS bit is a copy of the MYBUS bit for the other channel
See Table 4
BUSON bit along with the NBUSON bit decides whether any upstream channel is
connected to the downstream channel or not
See Table 5
NBUSON bit is a copy of the BUSON bit for the other channel
See Table 5
0: Bus initialization not requested
1 : Bus initialization requested
0: a Logic Level High to the INT line is sent (interrupt cleared)
1: a Logic Level Low to the INT line is sent (interrupt generated)
0: a Logic Level High to the INT line of the other channel is sent (interrupt cleared)
1: a Logic Level Low to the INT line of the other channel is sent (interrupt generated)
2004 Oct 01
8
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