Pin description
RM0082
Doc ID 018672 Rev 1
5 Pin
description
The following tables describe the pinout of the SPEAr300 listed by functional block.
List of abbreviations:
PU = Pull Up
PD = Pull Down
5.1 Required
external
components
●
DDR_COMP_1V8: place an external 121 k
resister between ball P4 and ball R4
●
USB_TX_RTUNE: connect an external 43.2
pull-down resistor to ball k5
●
DIGITAL_REXT: place an external 121 k
resistor between ball G4 and ball F4
5.2 Dedicated
pins
Ω
Ω
Ω
Table 3.
Master clock, RTC, Reset and 3.3 V comparator pin descriptions
Group
Signal name
Ball
Direction
Function
Pin type
Master Clock
MCLK_XI
P1
Input
24 MHz (typical)
crystal in
Oscillator 2.5 V
capable
MCLK_XO
P2
Output
24 MHz (typical)
crystal out
RTC
RTC_XI
E2
Input
32 kHz crystal in
Oscillator 1.5 V
capable
RTC_XO
E1
Output
32 kHz crystal out
Reset
MRESET#
(1)
1.
The minimum time for which MRESET should be low to reset the device is 1 millisecond.
M17
Input
Main Reset
TTL Schmitt trigger
input buffer, 3.3 V
tolerant
3.3 V Comp.
DIGITAL_REXT
G4
Output
Configuration
Analog, 3.3 V capable
DIGITAL_GND_REX F4
Power
Power
Power
Table 4.
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
CORE
VDD
F8, F9, G12, H5, H12, J5, L11, M6, M7, M11
1.2 V