LTP5901-IPR datasheet(29/34 Pages) LINER

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LTP5901-IPR/LTP5902-IPR

59012iprfa

For more information www.linear.com/LTP5901-IPR or www.linear.com/LTP5902-IPR

Doze State

The doze state consumes orders of magnitude less cur-

rent than the active state and is entered when all of the

peripherals and the CPU are inactive. In the Doze state

Eterna’s full state is retained, timing is maintained, and

Eterna is configured to detect, wake, and rapidly respond

to activity on I/Os (such as UART signals and the TIMEn

pin). In the doze state the 32.768kHz oscillator and as-

sociated timers are active.

Active State

In the active state, Eterna’s relaxation oscillator is running

and peripherals are enabled as needed. The ARM Cortex-

M3 cycles between CPU-active and CPU-inactive (referred

to in the ARM Cortex-M3 literature as sleep now mode).

Eterna’s extensive use of DMA and intelligent peripherals

that independently move Eterna between active state and

doze state minimizes the time the CPU is active, signifi-

cantly reducing Eterna’s energy consumption.

operaTion

REGULATORY AND STANDARDS COMPLIANCE

Radio Certification

The LTP5901 and LTP5902 have been certified under a

single modular certification, with the module name of

ETERNA2.Followingtheregulatoryrequirementsprovided

in the ETERNA2 Users Guide can enable customers to

ship products in the supported geographies, by simply

completing an unintentional radiator scan of the finished

product(s). The ETERNA2 Users Guide also provides the

technical information needed to enable customers to fur-

ther certify either the modules or products based upon the

modules in geographies that have not or do not support

modular certification.

Compliance to Restriction of Hazardous Substances

(RoHS)

Restriction of hazardous substances 2(RoHS 2) is a

directive that places maximum concentration limits on

the use of certain hazardous substances in electrical and

electronic equipment. Linear Technology is committed to

meeting the requirements of the European Community

directive 2011/65/EU.

This product has been specifically designed to utilize

RoHS-compliant materials and to eliminate or reduce the

use of restricted materials to comply with 2011/65/EU.

applicaTions inFormaTion

The RoHS-compliant design features include:

• RoHS-compliant solder for solder joints

• RoHS-compliant base metal alloys

• RoHS-compliant precious metal plating

• RoHS-compliant cable assemblies and connector

choices

• Halogen-free mold compound

• RoHS-compliant and 245°C re-flow compatible

Note: Customers may elect to use certain types of lead-

free solder alloys in accordance with the European Com-

munity directive 2011/65/EU. Depending on the type of

solder paste chosen, a corresponding process change to

optimize reflow temperatures may be required.

SOLDERING INFORMATION

The LTP5901 and LTP5902 are suitable for both eutectic

PbSn and RoHS-6 reflow. The maximum reflow solder-

ing temperature is 260°C. A more detailed description of

layoutrecommendations,assemblyproceduresanddesign

considerations is included in the LTP5901 and LTP5902

Hardware Integration Guide.

LTP5901-IPR 数据表(PDF) 29 Page - Linear Technology

LTP5901-IPR 数据表(HTML) 29 Page - Linear Technology

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