OMAP4460 Pandaboard ES
System Reference Manual
Revision 0.1
September 29, 2011
DOC-21054
Page 48 of 82
2.21
User Interface Features
Described below are the user features that are incorporated in the OMAP4460 Pandaboard ES.
2.21.1
S1 – Push Button Switch
S1 is a momentary push-button switch that may be depressed to initiate a power-on reset of the
Pandaboard ES. The normal power-on output from the TWL6030 is driven through an open-collector
driver, and the output of this switch is tied to the output of the output of the open-collector gate.
2.21.2
S2 - Push Button Switch
S2 is a momentary push-button switch whose output is tied to GPIO_113 on the Pandaboard ES.
Depressing this switch will momentarily ground GPIO_113. For proper operation of this switch, the
internal pull on this signal must be enabled, and it must be set to a pull-up NOT a pull-down.
2.21.3
SW1 – Dip/Slide Switch
SW1 is slide switch that is used to provide the Pandaboard ES user with the desired value on the
SYSBOOT3 input into the OMAP4460. Having this switch in the open position will cause SYSBOOT3
to be sampled as a logic ‘1’ at reset, while having it in the closed position will cause SYSBOOT3 to be
sampled low at reset.
2.22
I
2
C Device Mapping
The OMAP4460 Pandaboard ES contains four different I
2
C busses that are provided by the OMAP4460
(I
2
C1, I
2
C2, I
2
C3, and I
2
C4). The paragraphs below detail the seven bit I
2
C addresses for each device on
the different I
2
C busses. The write and read addresses are derived by adding a ‘0’ or ‘1’ respectively, to
the LSB of the address given below.
2.22.1
OMAP I
2
C1
Device
Function
I2C Address
TWL6030
Phoenix Power IC
0x48, 0x49, 0x4A
TWL6040
Phoenix Audio IC
0x4B
Table 15: OMAP I
2
C1 Device Addresses
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