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参数资料
| 型号： | DS1284Q+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC TIMEKEEPER WATCHDOG 28-PLCC |
| 标准包装： | 500 |
| 类型： | 时钟/日历 |
| 特点： | 警报器，闰年，方波输出，SRAM，监视计时器 |
| 存储容量： | 50B |
| 时间格式： | HH:MM:SS:hh（12/24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电压 - 电源，电池： | 2.4 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-LCC（J 形引线） |
| 供应商设备封装： | 28-PLCC（11.51x11.51） |
| 包装： | 带卷 (TR) |
DS1284/DS1286
7 of 18
WATCHDOG ALARM REGISTERS
Registers C and D contain the time for the watchdog alarm. The two registers contain a time count from
to 99.99 seconds in BCD. The value written into the watchdog alarm registers can be written or read in
any order. Any access to Registers C or D causes the watchdog alarm to reinitialize and clears the
watchdog flag bit and the watchdog interrupt output. When a new value is entered or the watchdog
registers are read, the watchdog timer starts counting down from the entered value to 0. When 0 is
reached, the watchdog interrupt output goes to the active state. The watchdog timer countdown is
interrupted and reinitialized back to the entered value every time either of the registers is accessed. In this
manner, controlled periodic accesses to the watchdog timer can prevent the watchdog alarm from ever
going to an active level. If access does not occur, the countdown alarm is repetitive. The watchdog alarm
registers always read the entered value. The actual countdown register is internal and is not readable.
Writing Registers C and D to 0 disables the watchdog alarm feature.
COMMAND REGISTER (0Bh)
Bit #:
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Name:
TE
IPSW
IBH
PU/LVL
WAM
TDM
WAF
TDF
Note: The initial state of these bits is not defined.
Bit 7: Transfer Enable (TE). This bit when set to logic 1 allows the internal time and date counters to
update the user accessible registers. When set to logic 0, the external, user-accessible time and date
registers remain static when being read or written, while the internal counters continue to run. The
function of this bit is further described in the time-of-day registers section
Bit 6: Interrupt Pin Swap (IPSW). This bit directs which type of interrupt is present on interrupt pins
INTA or INTB (INTB). When set to logic 1, INTA becomes the time-of-day alarm interrupt pin and
INTB (INTB) becomes the watchdog interrupt pin. When bit 6 is set to logic 0, the interrupt functions are
reversed such that the time-of-day alarm is output on
INTB (INTB) and the watchdog interrupt is output
on
INTA. Caution should be exercised when dynamically setting this bit as the interrupts are reversed
even if in an active state.
Bit 5: Interrupt B Active High/Low (IBH). When bit 5 is set to logic 1, the B interrupt output sources
current when active. When bit 5 is set to logic 0, the B interrupt output sinks current when active.
Bit 4: Pulse/Level Output (PU/LVL). When set to logic 1, the pulse mode is selected and
INTA sinks
current for a minimum of 3ms and then releases. Output
INTB (INTB) either sinks or sources current for
a minimum of 3ms depending on the level of bit 5. The watchdog timer continues to run and WAF is
cleared at the end of the pulse. When set to a logic 0, both
INTA and INTB (INTB), when active, output
an active low (
INTB (INTB) active high when IBH = 1) until the interrupt is cleared.
Bit 3: Watchdog Alarm Mask (WAM). When this bit is written to logic 1, the watchdog interrupt
output is deactivated regardless of the state of WAF. When WAM is set to logic 0 and the WAF bit is set
to a 1, the watchdog interrupt output goes to the active state, which is determined by bits 1, 4, 5, and 6 of
the command register.
Bit 2: Time-of-Day Alarm Mask (TDM). When this bit is written to logic 1, the time-of-day alarm-
interrupt output is deactivated regardless of the state of TDF. When TDM is set to logic 0, the time-of-day
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1285Q | 制造商:Maxim Integrated Products 功能描述: |
| DS1286 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1286+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1286I | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1286I+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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