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參數資料
| 型號： | PCA8565 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Real time clock/calender |
| 中文描述： | 實時時鐘/ calender |
| 文件頁數： | 11/26頁 |
| 文件大小： | 581K |
| 代理商： | PCA8565 |
Philips Semiconductors
PCA8565
Real time clock/calender
Product data
Rev. 01 — 31 March 2003
11 of 26
9397 750 10695
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
3. Clear STOP (control/status 1, bit STOP = 0)
4. Set time registers to desired value
5. Apply 32 clock pulses to CLKOUT
6. Read time registers to see the first change
7. Apply 64 clock pulses to CLKOUT
8. Read time registers to see the second change.
Repeat 7 and 8 for additional increments.
8.8 Power-On Reset (POR) override
The POR duration is directly related to the crystal oscillator start-up time. Due to the
long start-up times experienced by these types of circuits, a mechanism has been
built in to disable the POR and hence speed up on-board test of the device. The
setting of this mode requires that the I
2
C-bus pins, SDA and SCL, be toggled in a
specific order as shown in
Figure 5
. All timings are required minimums.
Once the override mode has been entered, the device immediately stops being reset
and normal operation may commence i.e. entry into the EXT_CLK test mode via
I
2
C-bus access. The override mode may be cleared by writing a logic 0 to TESTC.
TESTC must be set to logic 1 before re-entry into the override mode is possible.
Setting TESTC to logic 0 during normal operation has no effect except to prevent
entry into the POR override mode.
9.
Characteristics of the I
2
C-bus
The I
2
C-bus is for bidirectional, two-line communication between different ICs or
modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both
lines must be connected to a positive supply via a pull-up resistor. Data transfer may
be initiated only when the bus is not busy.
9.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must
remain stable during the HIGH period of the clock pulse as changes in the data line at
this time will be interpreted as a control signal (see
Figure 6
).
Fig 5.
POR override sequence.
handbook, full pagewidth
MGM664
SCL
500 ns
2000 ns
SDA
8 ms
override active
power up
相關PDF資料 |
PDF描述 |
|---|---|
| PCA8581C | 128 x 8-bit EEPROM with I2C-bus interface |
| PCA8581CP | 128 x 8-bit EEPROM with I2C-bus interface |
| PCA8581CT | 128 x 8-bit EEPROM with I2C-bus interface |
| PCA8581P | 128 x 8-bit EEPROM with I2C-bus interface |
| PCA8581T | 128 x 8-bit EEPROM with I2C-bus interface |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCA8565BS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Real time clock/calendar |
| PCA8565BS/1,118 | 功能描述:實時時鐘 AUTOMOTIVE CLOCK/CAL 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 |
| PCA8565BS/1-T | 功能描述:實時時鐘 AUTOMOTIVE CLOCK/CAL 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 |
| PCA8565TS | 制造商:PHIL 功能描述: |
| PCA8565TS/1,118 | 功能描述:實時時鐘 CMOS RTC/CALENDAR 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 |
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