參數(shù)資料
型號(hào)： CDP68HC68T1M
廠商： HARRIS SEMICONDUCTOR
元件分類： XO, clock
英文描述： CMOS Serial Real-Time Clock With RAM and Power Sense/Control
中文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO20
文件頁(yè)數(shù)： 18/24頁(yè)
文件大小： 139K
代理商： CDP68HC68T1M
18
NOTE: Example of a system in which the power is controlled by an external source. The LINE input pin can sense when the switch opens by use
of the POWER-SENSE INTERRUPT. The CDP68HC68T1 crystal drives the clock input to the CPU using the CLK OUT pin. On power down when
V
SYS
< V
BATT
+ 0.7V. V
BATT
will power the CDP68HC68T1. A threshold detect activates a P-Channel switch, connecting V
BATT
to V
DD
. V
BATT
always supplies power to the oscillator, keeping voltage frequency variation to a minimum.
FIGURE 17. EXTERNALLY CONTROLLED POWER SYSTEM DIAGRAM
A Procedure for Power-Down Operation might consist of the following:
1. Set power sense operation by writing bit 5 high in the Interrupt Control Register.
2. When an interrupt occurs, the CPU reads the Status Register to determine the interrupt source.
3. Sensing a power failure, the CPU does the necessary housekeeping to prepare for shutdown.
4. The CPU reads the Status Register again after several milliseconds to determine validity of power failure.
5. The CPU sets power-down bit 6 and disables all interrupts in the Interrupt Control Register when power down is verified. This
causes the CPU reset and clock out to be held low and disconnects the serial interface.
6. When power returns and V
SYS
rises above V
BATT
, power down is terminated. The CPU reset is released and serial communi-
cation is established.
System Diagrams
(Continued)
POR
V
SYS
V
DD
LINE
CDP68HC68T1
CE
CPUR
MISO
MOSI
SCK
V
BATT
CLK OUT
INT
V
DD
CDP68HC05C8B
PORT (e.g., PCO)
MISO
MOSI
SCK
RESET
OSC 1
IRQ
BRIDGE
GENERATOR
AC
LINE
V
DD
V
DD
CDP68HC68T1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CDP68HC68T1M2 功能描述:實(shí)時(shí)時(shí)鐘 PERIPH SPIAL-TIME- CLK 16W IND 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
CDP68HC68T1M296 功能描述:實(shí)時(shí)時(shí)鐘 PERIPH SPIAL-TIME- CLK 16W INDEL 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
CDP68HC68T1M296S2357 制造商:Rochester Electronics LLC 功能描述:- Bulk
CDP68HC68T1M2Z 功能描述:實(shí)時(shí)時(shí)鐘 PERI SPIAL-TIME-CLK 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
CDP68HC68T1M2Z96 功能描述:實(shí)時(shí)時(shí)鐘 PERI SPIAL-TIME-CLK 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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