IO20PDB0V0 datasheet(123/197 Pages) MICROSEMI

123 / 197 page

SmartFusion Customizable System-on-Chip (cSoC)

Re vi s i on 12

5 - 9

NCAP

Negative capacitor connection.

This is the negative terminal of the charge pump. A capacitor, with a

2.2 µF recommended value, is required to connect between PCAP and

NCAP. Analog charge pump capacitors are not needed if none of the

analog SCB features are used and none of the SDDs are used. In that

case it should be left unconnected.

PCAP

Positive Capacitor connection.

This is the positive terminal of the charge pump. A capacitor, with a 2.2

µF recommended value, is required to connect between PCAP and

NCAP. If this pin is not used, it must be left unconnected/floating. In this

case, no capacitor is needed. Analog charge pump capacitors are not

needed if none of the analog SCB features are used, and none of the

SDDs are used.

PTBASE

Pass transistor base connection

This is the control signal of the voltage regulator. This pin should be

connected to the base of an external pass transistor used with the

1.5 V internal voltage regulator and can be floating if not used.

PTEM

Pass transistor emitter connection.

This is the feedback input of the voltage regulator.

This pin should be connected to the emitter of an external pass

transistor used with the 1.5 V internal voltage regulator and can be

floating if not used.

MSS_RESET_N

Low

Low Reset signal which can be used as an external reset and can also

be used as a system level reset under control of the Cortex-M3

processor. MSS_RESET_N is an output asserted low after power-on

reset. The direction of MSS_RESET_N changes during the execution

of the Microsemi System Boot when chip-level reset is enabled. The

Microsemi System Boot reconfigures MSS_RESET_N to become a

reset input signal when chip-level reset is enabled. It has an internal

pull-up so it can be left floating. In the current software, the

MSS_RESET_N is modeled as an external input signal only.

PU_N

Low

Push-button is the connection for the external momentary switch used

to turn on the 1.5 V voltage regulator and can be floating if not used.

Name

Type

Polarity/Bus Size

Description

IO20PDB0V0 датащи(PDF) 123 Page - Microsemi Corporation

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