SPEAR300 datasheet(29/83 Pages) STMICROELECTRONICS

29 / 83 page

SPEAr300

Pin description

Doc ID 16324 Rev 2

29/83

Pin description

The following tables describe the pinout of the SPEAr300 listed by functional block.

List of abbreviations:

PU = Pull Up

PD = Pull Down

3.1

Required external components

DDR_COMP_1V8: place an external 121 k

resistor between ball P4 and ball R4

USB_TX_RTUNE: connect an external 43.2 k

 pull-down resistor to ball K5

DIGITAL_REXT: place an external 121 k

 resistor between ball G4 and ball F4.

3.2

Dedicated pins

Table 2.

Master clock, RTC, Reset and 3.3 V comparator pin descriptions

Group

Signal name

Ball

Direction

Function

Pin type

Master Clock

MCLK_XI

Input

24 MHz (typical)

crystal in

Oscillator 2.5 V

capable

MCLK_XO

Output

24 MHz (typical)

crystal out

RTC

RTC_XI

Input

32 kHz crystal in

Oscillator 1.5 V

capable

RTC_XO

Output

32 kHz crystal out

Reset

MRESET#

M17

Input

Main Reset

TTL Schmitt

trigger input

buffer, 3.3 V

tolerant, PU

3.3 V Comp.

DIGITAL_REXT

Output

Configuration

Analog, 3.3 V

capable

DIGITAL_GND_R

Power

Table 3.

Power supply pin description

Group

Signal name

Ball

Value

DIGITAL

GROUND

GND

G6, G7, G8, G9, G10, G11, H6, H7, H8, H9, H10,

H11, J6, J7, J8, J9, J10, J11, K6, K7, K8, K9, K10,

K11, L6, L7, L8, L9, L10, M8, M9, M10

0 V

ANALOG

GROUND

AGND

F2, G1, J2, L1, L3, L5, N2, N4, P3, R3,N12

0 V

I/O

VDD3

F5, F6, F7, F10, F11, F12, G5, J12, K12, L12, M12

3.3 V

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