TCA9548A_15 Datasheet, PDF (17/35 Pages) Texas Instruments – Low-Voltage 8-Channel I2C Switch With Reset

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B7
B6
X
X
X
X
X
X
X
X
X
X
X
X
0
X
1
0
X
1
0
0
TCA9548A
SCPS207E – MAY 2012 – REVISED OCTOBER 2015
Table 2. Command Byte Definition
CONTROL REGISTER BITS
B5
B4
B3
B2
B1
B0
0
X
X
X
X
X
1
0
X
X
X
X
X
1
0
X
X
X
X
X
1
0
X
X
X
X
X
1
0
X
X
X
X
X
1
0
X
X
X
X
X
1
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
COMMAND
Channel 0 disabled
Channel 0 enabled
Channel 1 disabled
Channel 1 enabled
Channel 2 disabled
Channel 2 enabled
Channel 3 disabled
Channel 3 enabled
Channel 4 disabled
Channel 4 enabled
Channel 5 disabled
Channel 5 enabled
Channel 6 disabled
Channel 6 enabled
Channel 7 disabled
Channel 7 enabled
No channel selected, power-up/reset
default state
8.5.5 RESET Input
The RESET input is an active-low signal that may be used to recover from a bus-fault condition. When this signal
is asserted low for a minimum of t_WL, the TCA9548A resets its registers and I²C state machine and deselects all
channels. The RESET input must be connected to V_CC through a pull-up resistor.
8.5.6 Power-On Reset
When power (from 0 V) is applied to V_CC, an internal power-on reset holds the TCA9548A in a reset condition
until V_CC has reached V_POR. At that point, the reset condition is released and the TCA9548A registers and I²C
state machine initialize to their default states. After that, V_CC must be lowered to below V_POR and then back up to
the operating voltage for a power-reset cycle.
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