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參數(shù)資料
| 型號： | CDP68HC68T1M2 |
| 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： | 0 TIMER(S), REAL TIME CLOCK, PDSO16 |
| 文件頁數(shù)： | 8/24頁 |
| 文件大?。?/td> | 139K |
| 代理商： | CDP68HC68T1M2 |
8
Power Sensing (See Figure 3)
When Power Sensing is enabled (Bit 5 = 1 in Interrupt Con-
trol Register), AC transitions are sensed at the LINE input pin.
Threshold detectors determine when transitions cease. After
a delay of 2.68ms to 4.64ms, plus the external input circuit RC
time constant, an interrupt is generated and a bit is set in the
Status Register. This bit can then be sampled to see if system
power has turned back on. See PIN FUNCTIONS, LINE PIN.
The power-sense circuitry operates by sensing the level of the
voltage presented at the line input pin. This voltage is cen-
tered around V
DD
and as long as it is either plus or minus a
threshold (about 1V) from V
DD
a power-sense failure will not
be indicated. With an AC signal present, remaining in this
V
DD
window longer than a minimum of 2.68ms will activate
the power-sense circuit. The larger the amplitude of the AC
signal, the less time it spends in the V
DD
window, and the less
likely a power failure will be detected. A 60Hz, 10V
P-P
sine-
wave voltage is an applicable signal to present at the LINE
input pin to setup the power sense function.
Power Down (See Figure 4)
Power down is a processor-directed operation. A bit is set in
the Interrupt Control Register to initiate operation. 3 pins are
affected. The PSE (Power Supply Enable) output, normally
high, is placed low. The CLK OUT is placed low. The CPUR
output, connected to the processors reset input is also
placed low. In addition, the Serial Interface is disabled.
Power Up (See Figure 5 and Figure 6)
Two conditions will terminate the Power-Down mode. The
first condition (See Figure 5) requires an interrupt. The inter-
rupt can be generated by the alarm circuit, the programma-
ble periodic interrupt signal, or the power sense circuit.
The second condition that releases Power Down occurs
when the level on the V
SYS
pin rises about 0.7V above the
level at the V
BATT
input, after previously falling to the level of
V
BATT
(See Figure 6) in the Battery Backup Mode or V
SYS
falls to logic low and returns high in the Single Supply Mode.
FIGURE 3. POWER-SENSING FUNCTIONAL DIAGRAM
FIGURE 4. POWER-DOWN FUNCTIONAL DIAGRAM
FIGURE 5. POWER-UP FUNCTIONAL DIAGRAM (INITIATED
BY INTERRUPT SIGNAL
XTAL IN
XTAL OUT
LINE
V
DD
REAL-TIME CLOCK
CDP68HC68T1
STATUS REGISTER
INT
INT
CPU
CDP68HC05C16B
V
DD
0V
I
V
SYS
INTERRUPT
CONTROL
REGISTER
I
SERIAL
INTERFACE
CLK
OUT
CPUR
REAL-TIME CLOCK
CDP68HC68T1
PSE
OSC
RESET
CPU
CDP68HC05C4B
MISO
MOSI
FROM SYSTEM
POWER
TO SYSTEM
POWER CONTROL
POWER
SENSE
OR
ALARM
CIRCUIT
SERIAL
INTERFACE
PERIODIC
INTERRUPT
SIGNAL
POWER
UP
REAL-TIME CLOCK
CDP68HC68T1
PSE
CPUR
CLK
OUT
INT
MISO
MOSI
CDP68HC68T1
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參數(shù)描述 |
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| CDP68HC68T1M296 | 功能描述:實(shí)時時鐘 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(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)時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| CDP68HC68T1M2Z96 | 功能描述:實(shí)時時鐘 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| CDP68HC68T1M96 | 功能描述:實(shí)時時鐘 PERIPH SPIAL-TIME- CLK 20W 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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