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參數資料
| 型號： | LV8573AM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | LV8573A Low Voltage Real Time Clock (RTC) |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO24 |
| 封裝： | PLASTIC, SOIC-24 |
| 文件頁數： | 14/18頁 |
| 文件大小： | 306K |
| 代理商： | LV8573AM |
Application Hints
(Continued)
5. Test bit D6 in the Periodic Flag Register:
IF a 1,
go to 4.1. If this bit remains a 1 after 3 seconds,
then abort and check hardware. The crystal may be de-
fective or not installed. There may be a short at OSC IN
or OSC OUT to V
CC
or GND, or to some impedance that
is less than 10 M
X
.
IF a 0,
then the oscillator is running, go to step 7.
6. Write a 0 to bit D6 in the Periodic Flag Register. This
action puts the clock chip in the battery backed mode.
This mode can be entered only if the OSC fail flag (bit
D6 of the Periodic Flag Register) is a 0. Reminder, bit D6
is a dual function bit. When read, D6 returns oscillator
status. When written, D6 causes either the Battery
Backed Mode, or the Single Supply Mode of operation.
The only method to ensure the chip is in the battery
backed mode is to measure the waveform at the OSC
OUT pin. If the battery backed mode was selected suc-
cessfully, then the peak to peak waveform at OSC OUT
is referenced to the battery voltage. If not in battery
backed mode, the waveform is referenced to V
CC
. The
measurement should be made with a high impedance
low capacitance probe (10 M
X
, 10 pF oscilloscope
probe or better). Typical peak to peak swings are within
0.6V of V
CC
and ground respectively.
7. Write a 1 to bit D7 of Interrupt Control Register 1. This
action enables the PFAIL pin and associated circuitry.
8. Initialize the rest of the chip as needed.
Typical Application
TL/F/11418–19
*
These components may be necessary to meet UL requirements
for lithium batteries. Consult battery manufacturer.
14
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