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Rev. C Design Changes
A Rev. C Design Changes
The AM273x GPEVM had various design changes for the Revision C of the board. The changes are listed
below:
1. Power Supply Changes
a. The Rev. C GPEVM makes use of the LP877451 PMIC, which requires a 3.3V pre regulator but
eliminate the need for additional external DC-DC converters.
Revision
Rev B
Rev C
2. Changes for McASP
a. The Rev C. routes out the McASP-A and McASP-C signals to a new 30 pin McASP header.
b. Two additional 1:2 Muxes were added to support the signal path of the McASP A/C signals to the header
where the select line logic comes from a single pole double throw switch.
Switch Position
Pin 1
Pin 3
c. The TRACE_DATA[0-6] signals from the AM273x were renamed to MUX_TRACE_DATA[0-6] to reflect
that the signals are now inputs to a mux before being routed to MIPI 60 pin header.
3. Changes for eCAP
a. The Rev C. routes out the eCAP signals to a new 4 pin eCAP header.
b. 1:2 Mux added to give the option to route the eCAP signals to the eCAP header where the select line
logic comes from a single pole double throw switch.
Switch Position
Pin 1
Pin 3
c. An additional single pole double throw switch was added to choose between the McASP-A CLK return
signal and the eCAP
38
AM273x Evaluation Module
Table A-1. Rev. C Power Solution Changes
External DC-DC
Function
Converters
TLV733
1.8V → 1.0V
TPS62813
3.3V → 1.2V
LM63625
12V→ 3.3V
Table A-2. McASP Mux Select
McASP_Mux_Select Logic
Pulled down to ground
Pulled up to 3.3V
Table A-3. eCAP Mux Select
McASP_Mux_Select Logic
Pulled down to ground
Pulled up to 3.3V
Copyright © 2024 Texas Instruments Incorporated
PMIC
TPS65313
12V → 5V, 3.3V, 1.8V
LP877451
3.3V → 5V, 3.3V, 1.8V,
1.2V,1.0V
Function
non-McASP signals are connected
McASP signals are connected to the 30-
pin header
Function
non-eCAP signals connected
eCAP signals connected to the 4-pin
header
SPRUIY1B – NOVEMBER 2020 – REVISED FEBRUARY 2024
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