参数资料
型号: AT73C224-EK1
厂商: Atmel
文件页数: 68/75页
文件大小: 0K
描述: KIT EVALUATION FOR AT73C224
标准包装: 1
系列: *
主要目的: 电源管理,电源监控器/跟踪器/序列发生器
嵌入式:
已用 IC / 零件: *
主要属性: *
次要属性: *
已供物品:
7.8.2
Table 7-8.
LDO RTC
LDO RTC Electrical Characteristics
Symbol
V BAT_LDORTC
V BACKUP
I OUT
I QQ
I BKQQ
Parameter
Operating Supply Voltage
Output Voltage
Load Current
Battery Quiescent Current
Backup Battery Quiescent
Current
Conditions
Vbat_ldortc present
Dc load current
en = 1
en = 0
Min
2.8
2.55
Typ
2.6
3
200
Max
5.25
2.65
2
5
300
Unit
V
V
mA
μA
nA
I SC
T S
Shutdown Current
Start-up Time
1
1
μA
ms
V TH
Reset Threshold
reset is active low
1.8
V
The LDO_Backup is a low drop out voltage regulator that is used to charge a 2.5V RTC
rechargeable backup battery (type NBL621). The max load current is 2 mA. An external 1 μF
ceramic capacitor (C11) is needed for compensation.
7.8.3
Table 7-9.
RTC Oscillator
RTC Oscillator Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V BACKUP
F CK
Supply voltage
Operating frequency
1.75
32.768
2.65
kHz
Duty
Ton
Duty cycle
Startup time
40
50
60
900
%
ms
V SIN
D RV
Level sinus wave on xin
Drive level
R S = 50 K ?
R S = 50 K ?
160
260
360
0.1
mVpp
μW
I
Current dissipation
OFF
5
nA
ON
0.8
2
μA
A CC
R S
Accuracy
Equivalent series resistance
T = 25 °C
Crystal @ 32.768kHz
3
50
mn/month
k ?
C MT
C SHUNT
C LOAD
Motional capacitance
Shunt capacitance
Load capacitance
Crystal @ 32.768kHz
Crystal @ 32.768kHz
Crystal @ 32.768kHz
1
0.6
6
3
2
12.5
fF
pF
pF
The RTC Oscillator is a low-frequency, 2-Pad, Pierce-type Xtal oscillator, optimized for 32.768
kHz crystal. For operation with 6 pF load capacitance crystals, no external components are
needed on “xin” and “xout”. It may be necessary to add external capacitors on “xin” and “xout” to
ground in special cases, for example, to exactly set the frequency or for crystals with a load
capacitance superior to 6 pF. The “clock” output is low during standby. “xin” and “xout” must not
be used to drive other circuitry.
68
AT73C224
6266A–PMAAC–08-Sep-08
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