参数资料
型号: AT73C224-A
厂商: Atmel
文件页数: 67/75页
文件大小: 0K
描述: IC PWR MGMT ANALOG PMAAC 32QFN
标准包装: 490
应用: 手持/移动设备
电源电压: 2.8 V ~ 5.25 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN(5x5)
包装: 托盘
AT73C224
7.8
7.8.1
Real-time Clock (RTC)
The Real-time Clock architecture is shown in Figure 7-6 and is comprised of the following
blocks: 2.6V LDO_RTC voltage regulator with backup switch, RTC oscillator and RTC block.
Block Diagram
Figure 7-6.
RTC Block Diagram
AT73C224-x
VDD0
VMON
VBAT_LDORTC
VDD0 < 2.8V
switch open
LDO_RTC off
LDO
RTC
VBACKUP
R2
Recharchable
2.6V
C11
Backup
Battery 2.5V
(NBL type)
XIN
RTC
RTC
Clock
RTC
OSC
XOUT
X1
32.768 kHz
crystal
D0 to D4
Serial
Interface
The LDO_RTC is used to charge the backup battery at 2.6V. When the main battery is plugged
in, the LDO is enabled and the backup switch is closed, thus charging the battery. If the
VBACKUP initial value is lower than the minimum backup voltage admissible (1.8V typical), an
active low reset is generated on reset signal.
The C11 capacitor is used for LDO compensation while the R2 resistor limits the charge current
for the backup battery.
The RTC oscillator is suited to work with a 32.768 kHz crystal oscillator and generates the
32.768 kHz clock for the RTC. The RTC block provides seconds, minutes, hours, days, date,
month, and year information. RTC time data is stored into a register that can be accessed via
the AT73C224-x device serial interface.
67
6266A–PMAAC–08-Sep-08
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