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參數(shù)資料
| 型號： | LV8573M |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | LV8573A Low Voltage Real Time Clock (RTC) |
| 中文描述： | LV8573A低電壓實時時鐘（RTC） |
| 文件頁數(shù)： | 5/18頁 |
| 文件大?。?/td> | 306K |
| 代理商： | LV8573M |
Connection Diagrams
In-Line Packages
TL/F/11418–5
Top View
DIP: Order Number LV8573AN
See NS Package Number N24C
SOIC: Order Number LV8573AM
See NS Package Number M24B
Plastic Chip Carrier
TL/F/11418–6
Top View
Order Number LV8573AV
See NS Package Number V28A
Functional Description
The LV8573A contains a fast access real time clock, inter-
rupt control logic, and power fail detect logic. All functions of
the RTC are controlled by a set of seven registers. A simpli-
fied block diagram that shows the major functional blocks is
given in Figure 1.
The blocks are described in the following sections:
1. Real Time Clock
2. Oscillator Prescaler
3. Interrupt Logic
4. Power Failure Logic
5. Additional Supply Management
The memory map of the RTC is shown in the memory ad-
dressing table (Figure 2). A control bit in the Main Status
Register is used to select either control register block.
INITIAL POWER-ON of BOTH V
BB
and V
CC
V
BB
and V
CC
may be applied in any sequence. In order for
the power fail circuitry to function correctly, whenever power
is off, the V
CC
pin must see a path to ground through a
maximum of 1 M
X
. The user should be aware that the con-
trol registers will contain random data. The user should en-
sure that the RTC is not in test mode (see register descrip-
tions).
REAL TIME CLOCK FUNCTIONAL DESCRIPTION
As shown in Figure 2, the clock has 8 bytes of counters,
which count from 1/100 of a second to years. Each counter
counts in BCD and is synchronously clocked. The count se-
quence of the individual byte counters within the clock is
shown later in Table VII. Note that the day of week, day of
month, and month counters all roll over to 1. The hours
counter in 12 hour mode rolls over to 1 and the AM/PM bit
toggles when the hours rolls over to 12 (AM
e
0, PM
e
1).
The AM/PM bit is bit D7 in the hours counter.
All other counters roll over to 0. Upon initial application of
power the counters will contain random information.
TL/F/11418–7
FIGURE 2. LV8573A Internal Memory Map
5
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