SPEAR320S datasheet(31/113 Pages) STMICROELECTRONICS

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SPEAr320S

Pin description

Doc ID 022508 Rev 2

31/113

3.2

Required external components

Some pads require the use of an external component. Please follow the instructions below

to ensure the proper functioning of the device:

DDR_COMP_1V8: place an external 121 k

Ω resistor between ball P4 and ball R4

USB_TX_RTUNE: connect an external 43.2

Ω pull-down resistor to ball K5

DIGITAL_REXT: place an external 121 k

Ω resistor between ball G4 and ball F4

DITH_VDD_2V5: add a ferrite bead to ball M4

3.3

Dedicated pins description

3.3.1

Clock, reset and 3V3 comparator pins

Table 6.

MCLK, RTC, Reset and 3.3 V comparator pins description

Group

Signal name

Description

Dir.

Pin type

Ball

Master clock

(MCLK)

MCLK_XI

24 MHz (typical) crystal in

Oscillator 2.5 V capable

MCLK_XO

24 MHz (typical) crystal out

Real-time clock

(RTC)

RTC_XI

32 kHz crystal in

Oscillator 1V5 capable

RTC_XO

32 kHz crystal out

Reset

MRESET

Main reset

TTL Schmitt trigger input

buffer, 3.3 V tolerant

M17

3.3 V

comparator

DIGITAL_REXT

Configuration

Analog, 3.3 V capable

DIGITAL_GNDBGCOMP Power

Power Power

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