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PCA8565 데이터시트 PDF




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부품번호 PCA8565 기능
기능 Real time clock/calender
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PCA8565 데이터시트, 핀배열, 회로
PCA8565
Real time clock/calender
Rev. 01 — 31 March 2003
Product data
1. General description
The PCA8565 is a CMOS real time clock/calendar optimized for low power
consumption. A programmable clock output, interrupt output and voltage-low detector
are also provided. All address and data are transferred serially via a two-line
bidirectional I2C-bus. Maximum bus speed is 400 kbit/s. The built-in word address
register is incremented automatically after each written or read data byte.
2. Features
s Provides year, month, day, weekday, hours, minutes and seconds based on
32.768 kHz quartz crystal
s Century flag
s Clock operating voltage: 1.8 to 5.5 V
s Extended operating temperature range: 40 to +125 °C
s Low backup current; typical 0.5 µA at VDD = 3.0 V and Tamb = 25 °C
s 400 kHz two-wire I2C-bus interface (at VDD = 1.8 to 5.5 V)
s Programmable clock output for peripheral devices (32.768 kHz, 1024 Hz,
32 Hz and 1 Hz)
s Alarm and timer functions
s Integrated oscillator capacitor
s Internal power-on reset
s I2C-bus slave address: read A3H and write A2H
s Open-drain interrupt pin.
3. Applications
s Automotive
s Industrial
s Other applications that require a wide operating temperature range.
4. Quick reference data
Table 1:
Symbol
VDD
Quick reference data
Parameter
supply voltage
IDD
Tamb
supply current
ambient temperature
Conditions
I2C-bus active; fSCL = 400 kHz;
Tamb = 40 to +125 °C
fSCL = 400 kHz
Min Typ Max Unit
1.8 -
5.5 V
--
40 -
820
+125
µA
°C




PCA8565 pdf, 반도체, 판매, 대치품
Philips Semiconductors
PCA8565
Real time clock/calender
8.1 Alarm function modes
By clearing the MSB of one or more of the alarm registers (bit AE = alarm enable),
the corresponding alarm condition(s) will be active. In this way an alarm can be
generated from once per minute up to once per week. The alarm condition sets the
Alarm Flag (AF). The asserted AF can be used to generate an interrupt (INT).
The AF can only be cleared by software.
8.2 Timer
The 8-bit countdown timer at address 0FH is controlled by the timer control register at
address 0EH. The timer control register determines one of 4 source clock
frequencies for the timer (4096 Hz, 64 Hz, 1 Hz, or 160 Hz), and enables or disables
the timer. The timer counts down from a software-loaded 8-bit binary value. At the
end of every countdown, the timer sets the Timer Flag (TF). The TF may only be
cleared by software. The asserted TF can be used to generate an Interrupt (INT). The
interrupt may be generated as a pulsed signal every countdown period or as a
permanently active signal which follows the condition of TF. Bit TI/TP is used to
control this mode selection. When reading the timer, the current countdown value is
returned.
8.3 CLKOUT output
A programmable square wave is available at pin CLKOUT. Operation is controlled by
the CLKOUT control register at address 0DH. Frequencies of 32.768 kHz (default),
1024 Hz, 32 Hz and 1 Hz can be generated for use as a system clock,
microcontroller clock, input to a charge pump, or for calibration of the oscillator.
CLKOUT is an open-drain output and enabled at power-on. If disabled it becomes
high-impedance.
8.4 Reset
The PCA8565 includes an internal reset circuit which is active whenever the oscillator
is stopped. In the reset state the I2C-bus logic is initialized and all registers, including
the address pointer, are cleared with the exception of bits FE, VL, TD1, TD0, TESTC
and AE which are set to logic 1.
8.5 Voltage-low detector
The PCA8565 has an on-chip voltage-low detector. When VDD drops below Vlow,
bit VL in the seconds register is set to indicate that the integrity of the clock
information is no longer guaranteed. The VL flag can only be cleared by software.
Bit VL is intended to detect the situation when VDD is decreasing slowly, for example
under battery operation. Should VDD reach Vlow before power is re-asserted then
bit VL will be set. This will indicate that the time may be corrupted.
9397 750 10695
Product data
Rev. 01 — 31 March 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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PCA8565 전자부품, 판매, 대치품
Philips Semiconductors
PCA8565
Real time clock/calender
Table 8: INT operation (bit TI/TP = 1)
Source clock (Hz)
INT period (s)[2]
n = 1[1]
4 096
18 192
64 1128
1 164
160 164
[1] TF and INT become active simultaneously.
[2] n = loaded countdown value. Timer stopped when n = 0.
n>1
14 096
164
164
164
8.6.3 Time and date registers
Table 9:
Bit
7
6 to 0
Seconds/VL (address 02H) bits description
Symbol Value
Description
VL 0
clock integrity is guaranteed
1 integrity of the clock information is no longer guaranteed
seconds
00 to 59
this register holds the current seconds coded in BCD format; example: seconds
register contains x101 1001 = 59 seconds
Table 10: Minutes (address 03H) bits description
Bit
Symbol Value
Description
6 to 0
minutes 00 to 59 this register holds the current minutes coded in BCD format
Table 11: Hours (address 04H) bits description
Bit
Symbol Value
Description
5 to 0
hours
00 to 23 this register holds the current hours coded in BCD format
Table 12:
Bit
5 to 0
Days (address 05H) bits description
Symbol Value
Description
days[1]
01 to 31 this register holds the current day coded in BCD format
[1] The PCA8565 compensates for leap years by adding a 29th day to February if the year counter contains a value which is exactly
divisible by 4, including the year 00.
Table 13:
Bit
2 to 0
Weekdays (address 06H) bits description
Symbol Value
Description
weekdays[1] 0 to 6
this register holds the current weekday coded in BCD format, see Table 14
[1] These bits may be re-assigned by the user.
Table 14: Weekday assignments
Day Bit 7 Bit 6 Bit 5
Sunday
xxx
Monday
xxx
Tuesday
xxx
Wednesday
x
x
x
Bit 4
x
x
x
x
Bit 3
x
x
x
x
Bit 2
0
0
0
0
Bit 1
0
0
1
1
Bit 0
0
1
0
1
9397 750 10695
Product data
Rev. 01 — 31 March 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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