Datasheet > AN-1027

AN-1027

更新时间： 2024-10-29 12:54:11

品牌	Logo	应用领域
CYMBET		微控制器
页数	文件大小	规格书
3页	228K
描述
Ultra Low Power Microcontroller Backup Using the EnerChip

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AN-1027 数据手册

Preliminary

AN-1027

Application Note

Ultra Low Power Microcontroller Backup Using the EnerChip™ CC

Introduction

Cymbet EnerChips are solid state rechargable batteries having distinguishing characteristics compared to

conventional rechargeable batteries. EnerChips have a high charge/discharge cylce life; low self-discharge;

simple voltage controlled charging; ﬂat discharge voltage proﬁle; have no ﬂammable solvents to leak or catch

ﬁre; are solder reﬂow tolerant; and are offered in low proﬁle surface mount packages.

The EnerChip CC is a surface mount package containing a rechargeable solid state battery - the EnerChip -

with integrated battery management that includes charge control, discharge cutoff circuitry, and a battery

switchover (i.e., supply supervisory) function. EnerChips are used in applications requiring backup, bridging,

or transition power to maintain real-time clock operation or SRAM data retention in the event of main power

interruption; wireless sensing as the main power source when energy can be harvested from the ambient

power and used to constantly trickle charge the EnerChip; and as a power source to perform housekeeping for

microcontrollers (MCUs) and peripherals when main power is interrupted, to ensure an orderly shutdown or

transition to low power modes.

In MCU-based applications demanding ultra low power consumption, it is essential to reduce or eliminate the

power drawn by components peripheral to the MCU. This Application Note describes a method to completely

eliminate the power drawn by the EnerChip CC integrated battery management circuitry when the system is in

the normal operating mode. This approach enables a backup battery solution that does not draw power when

in normal run mode, thus maximizing the main battery life in battery powered systems.

GPIO

Q1A

VDD

GPIO

CBC3112 or CBC3150

VCHG

MCU with Supply Supervisor

VBAT

0.1uF

VMODE

RESET

VOUT

Q1B

VDD

GND

10uF

Figure 1. Typical Application Circuit Using the EnerChip CC and Microcontroller for Ultra Low Power Operation.

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