- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379179 > DS14287 Real Time Clock with NV RAM Control PDF資料下載
參數(shù)資料
| 型號： | DS14287 |
| 英文描述： | Real Time Clock with NV RAM Control |
| 中文描述： | 實時時鐘，帶有非易失RAM控制器 |
| 文件頁數(shù)： | 12/25頁 |
| 文件大?。?/td> | 303K |
| 代理商： | DS14287 |
DS14285/DS14287
12 of 25
REGISTER C
MSB
BIT 7
IRQF
LSB
BIT 6
PF
BIT 5
AF
BIT 4
UF
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
0
IRQF -
The Interrupt Request Flag (IRQF) bit is set to a 1 when one or more of the following are true:
PF = PIE = 1
AF = AIE = 1
UF = UIE = 1
That is, IRQF = PF
=
PIE + AF
=
AIE + UF
=
UIE.
Any time the IRQF bit is a 1, the
IRQ
pin is driven low. All flag bits are cleared after Register C is read
by the program or when the
RESET
pin is low.
PF -
The Periodic Interrupt Flag (PF) is a read-only bit which is set to a 1 when an edge is detected on the
selected tap of the divider chain. The RS3 through RS0 bits establish the periodic rate. PF is set to a 1
independent of the state of the PIE bit. When both PF and PIE are 1s, the
IRQ
signal is active and will set
the IRQF bit. The PF bit is cleared by a
RESET
or a software read of Register C.
AF -
A 1 in the Alarm Interrupt Flag (AF) bit indicates that the current time has matched the alarm time.
If the AIE bit is also a 1, the
IRQ
pin will go low and a one will appear in the IRQF bit. A
RESET
or a
read of Register C will clear AF.
UF -
The Update Ended Interrupt Flag (UF) bit is set after each update cycle. When the UIE bit is set to
1, the 1 in UF causes the IRQF bit to be a 1 which will assert the
IRQ
pin. UF is cleared by reading
Register C or a
RESET
.
BIT 0 THROUGH BIT 3 -
These are unused bits of the status Register C. These bits always read 0 and
cannot be written.
REGISTER D
MSB LSB
BIT 7
BIT 6
BIT 5
BIT 4
VRT
0
0
0
BIT 3
0
BIT 2
0
BIT 1
0
BIT 0
0
VRT -
The Valid RAM and Time (VRT) bit indicates the condition of the internal battery (the battery
connected to the V
BAT
pin in the case of the DS14285S, DS14285, and the DS14285Q). This bit is not
writable and should always be a 1 when read. If a 0 is ever present, an exhausted internal lithium energy
source is indicated and both the contents of the RTC data and RAM data are questionable. This bit is
unaffected by
RESET
.
BIT 6 THROUGH BIT 0 -
The remaining bits of Register D are not usable. They cannot be written and,
when read, they will always read 0.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS14285-DS14287 | Real Time Clock with NV RAM Control |
| DS14285 | Real Time Clock with NV RAM Control |
| DS14285N | Real Time Clock with NV RAM Control |
| DS14285Q | Real Time Clock with NV RAM Control |
| DS14285QN | Real Time Clock with NV RAM Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS14287+ | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1-48-0001 | 功能描述:固定電感器 DS Storage choke 3.15A RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| DS1-48-0002 | 功能描述:固定電感器 DS Storage choke 4A RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| DS1-48-0003 | 制造商:Schurter Electronic Components 功能描述: |
| DS1-48-0004 | 制造商:Schurter Electronic Components 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。