3.4.12 Tamper and System Signal Connectors

Unused signals and PIOs provided by the MPU are routed on separate connectors, J33 and J34 (not mounted). System signals are also accessible externally on these connectors.

The board provides two tamper pins for static or dynamic intrusion detections on header J33. Audio clock signal, shutdown and JTAGSEL are also present on the same connector.

Unused and available system signals are available on header J34.

Figure 3-47. Tamper and System Signals Connectors Schematic

The tables below provide a signal description of headers J33 and J34.

Table 3-31. J33 Signal Description
Signal NameSignal Description

PIOBU2

Tamper I/O 2

PIOBU3

Tamper I/O 3

AUDIOCLK

Dedicated audio clock signal

SHDN

Signal used to enable and disable an external power supply circuit

JTAGSEL

When pulled high, enables the JTAG boundary scan

Table 3-32. J34 Signal Description
Signal NameSignal Description

MCP16502_HPM

PMIC High-Power mode enable

NRST_OUT

Peripheral reset output

NRST

Processor reset input

SEL_VLDO1

Selects the output voltage of LDO1 of the MCP16502 PMIC