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5.2
5.2.1
5.2.2
5.2.2.1
5.2.2.2
10
Automatic Start-up Sequences and Shut-down
Start-up/Wakeup
If the backup battery (only) is present, the RTC is running (1.2 μA). This mode is called “Backup
mode”. When the main battery is plugged in and voltage is higher than 2.8V, the LDO_RTC
recharges the backup battery through an internal switch (if the main battery is lower than 2.8V,
nothing happens, RTC still running). This mode is called “Standby mode”. Note that when the
battery is plugged in (and higher than 2.8V), a reset of the RTC is performed only if the backup
battery was lower than 1.8V.
Now, the system waits for wake-up information coming from the pushbutton (EN pin) or an RTC
alarm. When one of the previous conditions occurs, the automatic start-up sequence starts
(without any external commands).
Different automatic start-up sequences can be chosen from the AT73C224-x family (see Figure
When the automatic start-up sequence has been completed, the POK signal (which is an open
drain signal) goes high, thus implementing a sort of POR for the user (i.e., a microcontroller) and
enters into “Normal mode”.
Note: Power On is controlled by default by an external pushbutton, connected on EN pin (the EN
pad has an internal 100 k ? pull up). A switch can also be used as shown bellow but should be a
request from the customer
.
EN
(Default: Pushbutton)
EN
(On request: switch)
Shut-down
Static Mode
In Static mode, the Power-off condition is an OR between the following conditions: main battery
lower than 2.8V or electrical default in the DC/DC (short-circuit). When Power-off condition
occurs, POK signal is cleared, then the AT73C224-x device waits for the signal ITB/RDY to shut
down all power supplies.
Dynamic Mode
In Dynamic mode, Power-off condition is an OR between the following conditions: electrical
default in the DC/DC (short-circuit) or software shutdown. When main battery lower than 2.8V,
an interrupt is generated on signal ITB/RDY. It is the responsibility of the host microcontroller to
perform a software shut-down by properly writing the AT73C224-x device registers through the
serial interface. After that, the POK signal is cleared, and all is turned off. A check on the push-
button is then performed to assure that it has been released, thus avoiding continuous on-off-on
behavior. The “normal” shutdown is performed by software. Note that the microcontroller has to
write the proper register to enable the power off (see Section 6. ”Register Tables” ).
AT73C224
6266A–PMAAC–08-Sep-08
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相关代理商/技术参数
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制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
AT73C224-G
制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
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制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
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功能描述:电池管理 Monolithic numeric RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
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功能描述:其他电源管理 NGD : MONOLITHIC NUMERIC IC RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel
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功能描述:电池管理 Monolithic numeric RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
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制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)