LPD-SOM-CLIP1 Logic, LPD-SOM-CLIP1 Datasheet - Page 20

• Manufacturer Part Number: LPD-SOM-CLIP1
• Description: CLIP RETENTION PLATE
• Manufacturer: Logic

Specifications of LPD-SOM-CLIP1

• Accessory Type: Retention Clip
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: SOM-M1
• Other names: 460-3502

5.5.1.3
5.5.1.4
5.5.2
5.5.3
PN 1013755 Rev 5
MAIN_BATT_IN. If appropriate voltage is applied to the USB0_VBUS input, the TPS65070 PMIC
and OMAP-L138 processor will immediately start up and run. The USB0_VBUS input is capable
of charging MAIN_BATT_IN.
The MAIN_BATT_IN input is designed to be connected to a typical single lithium-ion battery. The
TPS65070 PMIC will only power the SOM from MAIN_BATT_IN if power is not present at 5V or
USB0_VBUS inputs. If appropriate voltage is applied to the MAIN_BATT_IN input, the TPS65070
PMIC and OMAP-L138 processor will NOT immediately start up and run; a momentary low signal
is also required on the PMIC_PB_IN pin. The TPS65070 PMIC is capable of charging
MAIN_BATT_IN from either the 5V input or the USB0_VBUS input.
For startup, MAIN_BATT_IN range is: 3.6V < MAIN_BATT_IN < 4.2V
At runtime, MAIN_BATT_IN range is: UVLO < MAIN_BATT_IN < 4.2V
UVLO = UnderVoltage LockOut
UVLO = 3.0V (default), 2.8V < UVLO < 3.25V (programmable)
IMPORTANT NOTES:
Though UVLO may be set as low as 2.8V, not all OMAP-L138
2.8V operation. The SOM contains an internal 3.3V power rail, and devices connected to this rail
may have dropout voltages much greater than UVLO. See Section 3.2 for the recommended
range of input voltages.
Before designing a system which powers the OMAP-L138
user should first review the following documents: TPS65070 Datasheet, OMAP-L138 SOM-M1
Schematic, and OMAP-L138 Baseboard Schematic.
The VRTC_IN power rail is used to power the onboard RTC module. Always power this rail to
maintain the clock of the product. A lithium-ion coin cell typically supplies power to this rail.
Dual Voltage I/O
The OMAP-L138 processor and OMAP-L138 SOM-M1 uniquely support dual-voltage I/O. The
user may select an operating voltage of either 1.8V or 3.3V through “IO_VOLTAGE_SEL” J1.37.
For 3.3V operation, J1.37 should be left unconnected. For 1.8V operation, J1.37 should be tied
directly to GND.
System Power Management
Good power management design is important in any system development and embedded system
design is no exception. In embedded system design, power management is typically one of the
most complicated areas due to the dramatic effect it has on product cost, performance, usability,
and overall customer satisfaction. Many factors affect a power-efficient hardware design: power
supply selection (efficiency), clocking design, IC and component selection, etc. The OMAP-L138
SOM-M1 was designed with these aspects in mind while also providing maximum flexibility in
software and system integration.
On the OMAP-L138 there are many different software configurations that drastically affect power
consumption: microcontroller core clock frequency, bus clock frequency, peripheral clocks, bus
MAIN_BATT_IN
VRTC_IN
Logic Product Development Company, All Rights Reserved
PRELIMINARY DOCUMENT—SUBJECT TO CHANGE
OMAP-L138 SOM-M1 Hardware Specification
SOM-M1
SOM-M1
from MAIN_BATT_IN, the
circuits are capable of
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