Interfaces and Connectors
Revised May 2011
SB-A510 Rev 1.1
11
3
SYSTEM COMPONENTS
3.1
DC Power Supply
All SB-A510 power rails are generated from a 12V DC input (connector J2).
SB-A510 supports two power states:
Full power mode – all SB-A510 power rails are enabled.
Low power mode – only power rails required for sleep-mode support are enabled. All other
voltage rails are disabled (gated).
SB-A510 power state is controlled by the CM-A510 “STBY_PWRDWN” signal, available on pin 37
of connector P1.
Table 5 Power mode selector signal table
STBY_PWRDWN
SB-A510 power mode
High
Full power mode
Low
Low power mode
The figure below describes the SB-A510 power scheme.
Figure 2 SB-A510 Power Scheme
Gate - closed when in low power mode
Power rail - always available
Power rail - Available only when system
is in full power mode
Software controlled gate
Power supply regulator
DC 12V
input
Step-Down
(12V -> 5V)
Step Down
(12V -> 3.3V)
Gate
Gate
SW
Gate
5VSBY
3V3SBY
VCC3_3
VCC_MMC
LDO
(3.3V -> 1.8V)
LDO
(3.3V -> 1.5V)
LDO
(3.3V -> 1.0V)
Gate
Gate
VCC_5V
1.5SBY
VCC1_5
1.0SBY
VCC1_0
VCC1_8
Gate
VCC_12V
L
E
G
E
N
D
The “5VSBY” power rail supplies the CM-A510 module and certain SB-A510 peripherals. Other
power rails are used only for SB-A510 peripherals.
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