User Manual
Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 382 of 909 2019 Ambiq Micro, Inc.
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Table 561: Pad Function Color and Symbol Code
Color/
Symbol
Function Pad Type
ADC Signals Analog or Input, as indicated by [A] or [I] respectively
I
2
C/SPI Slave Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively,
I
2
C/SPI Master 0 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
I
2
C/SPI Master 1 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
I
2
C/SPI Master 2 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
I
2
C/SPI Master 3 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
I
2
C/SPI Master 4 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
I
2
C/SPI Master 5 Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
MSPI Signals
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
Global IOM/MSPI
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
SCARD
Input, Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
GPIO Signals Controlled by GPIO Configuration
Counter/Timer Signals Controlled by CTIMER Configuration
UART0 Signals
Input or Push-pull output, as indicated by [I] or [O] respec-
tively
UART1 Signals
Input or Push-pull output, as indicated by [I] or [O] respec-
tively
Audio Signals
Input or Push-pull output, as indicated by [I] or [O] respec-
tively
Clock Output Signals Push-pull Output
Debug Signals
Input Special or Push-pull output, as indicated by [I], [S] or
[O] respectively
High-side power switch
Pads 3 and 36 have selectable high side power switch tran-
sistors to provide ~1 Ω switches to VDDH.
Low-side power switch
Pads 37 and 41 have selectable low side power switch tran-
sistors to provide ~1 Ω switches to VSS.
Table 562: Special Pad Types
Pad PADnFNCSEL Name Pad Type
0 5 MSPI4 Bidirectional Tri-state