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參數(shù)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(shù)： | 10/26頁 |
| 文件大?。?/td> | 581K |
| 代理商： | PCA8565 |
Philips Semiconductors
PCA8565
Real time clock/calender
Product data
Rev. 01 — 31 March 2003
10 of 26
9397 750 10695
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
For accurate read back of the countdown value, the I
2
C-bus clock (SCL) must be
operating at a frequency of at least twice the selected timer clock.
8.7 EXT_CLK test mode
A test mode is available which allows for on-board testing. In such a mode it is
possible to set up test conditions and control the operation of the RTC.
The test mode is entered by setting bit TEST1 in control/status1 register. Then
pin CLKOUT becomes an input. The test mode replaces the internal 64 Hz signal
with the signal applied to pin CLKOUT. Every 64 positive edges applied to
pin CLKOUT will then generate an increment of one second.
The signal applied to pin CLKOUT should have a minimum pulse width of 300 ns and
a minimum period of 1000 ns. The internal 64 Hz clock, now sourced from CLKOUT,
is divided down to 1 Hz by a 2
6
divide chain called a pre-scaler. The pre-scaler can be
set into a known state by using bit STOP. When bit STOP is set, the pre-scaler is
reset to 0 (STOP must be cleared before the pre-scaler can operate again).
From a STOP condition, the first 1 second increment will take place after 32 positive
edges on CLKOUT. Thereafter, every 64 positive edges will cause a 1 second
increment.
Remark:
Entry into EXT_CLK test mode is not synchronized to the internal 64 Hz
clock. When entering the test mode, no assumption as to the state of the pre-scaler
can be made.
Operation example:
1. Set EXT_CLK test mode (control/status 1, bit TEST1 = 1)
2. Set STOP (control/status 1, bit STOP = 1)
Table 24:
Bit
7
Timer control (address 0EH) bits description
Symbol
Value
TE
0
1
TD1 and
TD0
Description
timer is disabled
timer is enabled
timer source clock frequency select; these bits determine the source clock for the
countdown timer, see
Table 25
; when not in use, TD1 and TD0 should be set to
1
16
Hz for power saving
1 to 0
Table 25:
TD1
0
0
1
1
TD1 and TD0: Timer frequency selection
TD0
0
1
0
1
TIMER Source clock frequency
4096 Hz
64 Hz
1 Hz
1
60
Hz
Table 26:
Bit
7 to 0
Timer (address 0FH) bits description
Symbol
Value
timer
00 to FF
Description
countdown value = n;
CountdownPeriod
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相關(guān)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 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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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