- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385273 > DS3234 (Maxim Integrated Products, Inc.) Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM PDF資料下載
參數(shù)資料
| 型號： | DS3234 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| 中文描述： | 高精度、SPI總線RTC，集成晶體和SRAM |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 328K |
| 代理商： | DS3234 |
D
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
____________________________________________________________________
13
Alarms
The DS3234 contains two time-of-day/date alarms. Alarm
1 can be set by writing to registers 07h to 0Ah. Alarm 2
can be set by writing to registers 0Bh to 0Dh. The alarms
can be programmed (by the alarm enable and INTCN
bits of the control register) to activate the
INT
/SQW output
on an alarm match condition. Bit 7 of each of the time-of-
day/date alarm registers are mask bits (Table 2). When all
the mask bits for each alarm are logic 0, an alarm only
occurs when the values in the timekeeping registers
match the corresponding values stored in the time-of-
day/date alarm registers. The alarms can also be pro-
grammed to repeat every second, minute, hour, day, or
date. Table 2 shows the possible settings. Configurations
not listed in the table will result in illogical operations.
The DY/
DT
bits (bit 6 of the alarm day/date registers)
control whether the alarm value stored in bits 0 to 5 of
that register reflects the day of the week or the date of
the month. If DY/
DT
is written to logic 0, the alarm will
be the result of a match with date of the month. If
DY/
DT
is written to logic 1, the alarm will be the result of
a match with day of the week.
When the RTC register values match alarm register set-
tings, the corresponding Alarm Flag ‘A1F’ or ‘A2F’ bit is
set to logic 1. If the corresponding Alarm Interrupt
Enable ‘A1IE’ or ‘A2IE’ is also set to logic 1 and the
INTCN bit is set to logic 1, the alarm condition activates
the
INT
/SQW signal. The match is tested on the once-
per-second update of the time and date registers.
Table 2. Alarm Mask Bits
ALARM 1 REGISTER MASK BITS (BIT 7)
A1M4
A1M3
1
1
1
1
1
1
1
0
0
0
0
0
DY/
DT
A1M2
1
1
0
0
0
0
A1M1
1
0
0
0
0
0
ALARM RATE
X
X
X
X
0
1
Alarm once per second
Alarm when seconds match
Alarm when minutes and seconds match
Alarm when hours, minutes, and seconds match
Alarm when date, hours, minutes, and seconds match
Alarm when day, hours, minutes, and seconds match
ALARM 2 REGISTER MASK BITS (BIT 7)
A2M4
A2M3
1
1
1
1
1
0
0
0
0
0
DY/
DT
A2M2
1
0
0
0
0
ALARM RATE
X
X
X
0
1
Alarm once per minute (00 seconds of every minute)
Alarm when minutes match
Alarm when hours and minutes match
Alarm when date, hours, and minutes match
Alarm when day, hours, and minutes match
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS3234S | Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| DS3234SN | Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| DS33Z11 | Ethernet Mapper |
| DS33ZH11 | Ethernet Mapper |
| DS3803 | 1024K Flexible NV SRAM SIMM(1024K靈活的非易失性SRAM SIMM) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3234_07 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| DS3234_08 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| DS3234_10 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM |
| DS3234_BREAKOUT_ | 制造商:MCM 功能描述:DS3234 BREAKOUT BOARD 制造商:PREMIER FARNELL 功能描述:DS3234 BREAKOUT BOARD |
| DS3234_BREAKOUT_B34 | 制造商:Distributed By MCM 功能描述:DS3234 Real Time Clock Breakout Board |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。