ambiq micro Apollo4 Blue EVB Manuale di avvio rapido - Pagina 17
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Non-Power Solder Bridges
9.1
Solder Bridges for Reducing Trace Length to Optimize Performance
The following peripherals support solder-bridge connections, which allow for optimized performance by
reducing overall trace length at the cost of losing connectivity to their respective GPIO headers. Note that
these connections can be reset by applying solder across the solder-bridge.
Peripheral
Display Controller, MSPI0
ETM
Table 2: Peripherals Supporting Solder Bridge Connections
Additionally, the LED indicators can be disconnected from GPIO30, GPIO60 and GPIO90 by opening their
respective solder-bridges (SB37, SB38, and SB39). GPIO47, GPIO58, GPIO59 and GPIO60 are used for
UART communication with the on-board J-Link. Opening SB26-SB29 frees these pins for exclusive use
with the standard GPIO headers J10 and J12.
9.2
Solder Bridges for Audio Selectivity
As shown in Figure 12, a single audio jack, J18, provides stereo audio input routed to AUDADC (also
referred to as LPADC) inputs on the SoC. Alternatively, up to 4 single-ended or 2 differential pair audio
signals as shown in Figure 13 can be input on connector J17 which is routed on the EVB as differential
pair(s) to AUDADC inputs. The default (shorted) solder bridge configuration enables either of these input
options.
QS-A4-4p1
GPIO
Opening the following corresponding solder-bridges shown in
37, 64-73
Figure 3 connects these GPIO exclusively to J8, with minimal trace
stubs: SB36, SB56, SB55, SB30 - SB35, SB53, SB54.
Opening the following corresponding solder-bridges shown in
50-54, 55 (open by default)
Figure 3 connect these GPIO exclusively to J13: SB42 - SB46, SB57.
SWO is default connection to J13 (shared with , SWTRCTL)
Page 17
Apollo4 EVB Quick Start Guide
Description
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