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Revision 0.6
OMAP TM 4 PandaBoard System
Reference Manual
November 29, 2010
DOC-21010
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. 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 that whose output is tied to GPIO_121 on the PandaBoard.
Depressing this switch will momentarily ground GPIO_121. 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.
2.22
I 2 C Device Mapping
The OMAP4430 PandaBoard contains four different I 2 C busses that are provided by the OMAP4430
(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
TWL6030
TWL6040
Function
Phoenix Power IC
Phoenix Audio IC
I2C Address
0x48, 0x49, 0x4A
0x4B
Table 14: OMAP I 2 C1 Device Addresses
2.22.2 OMAP I 2 C2
Device
Display Expansion Connector
Function
External LCD Control
(e.g. touchscreen)
I2C Address
TBD
Table 15: OMAP I 2 C2 Device Addresses
Page 50 of 82
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