PCA9547 データシートの表示（PDF） - Philips Electronics
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PCA9547 Datasheet PDF : 26 Pages
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Philips Semiconductors
PCA9547
8-channel I2C-bus multiplexer with reset
Table 4. Control register
Write = channel selection; Read = channel status
D7 D6 D5 D4 B3 B2 B1
X
X
X
X
0
X
X
X
X
X
X
1
0
0
X
X
X
X
1
0
0
X
X
X
X
1
0
1
X
X
X
X
1
0
1
X
X
X
X
1
1
0
X
X
X
X
1
1
0
X
X
X
X
1
1
1
X
X
X
X
1
1
1
0
0
0
0
1
0
0
B0 Command
X no channel selected
0 channel 0 enabled
1 channel 1 enabled
0 channel 2 enabled
1 channel 3 enabled
0 channel 4 enabled
1 channel 5 enabled
0 channel 6 enabled
1 channel 7 enabled
0 channel 0 enabled;
power-up/reset default state
6.3 RESET input
The RESET input is an active LOW signal which may be used to recover from a bus fault
condition. By asserting this signal LOW for a minimum of tw(rst)L, the PCA9547 will reset its
register and I2C-bus state machine and will deselect all channels except channel 0. The
RESET input must be connected to VDD through a pull-up resistor.
6.4 Power-on reset
When power is applied to VDD, an internal Power-On Reset (POR) holds the PCA9547 in
a reset condition until VDD has reached VPOR. At this point, the reset condition is released
and the PCA9547 register and I2C-bus state machine are initialized to their default states,
causing all the channels to be deselected except channel 0. Thereafter, VDD must be
lowered below 0.2 V to reset the device.
PCA9547_2
Product data sheet
Rev. 02 — 12 September 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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