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PCF8583P Datasheet(PDF) 21 Page - NXP Semiconductors

Part # PCF8583P
Description  Clock/calendar with 240 x 8-bit RAM
Download  28 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCF8583P Datasheet(HTML) 21 Page - NXP Semiconductors

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1997 Jul 15
21
Philips Semiconductors
Product specification
Clock/calendar with 240
× 8-bit RAM
PCF8583
Fig.21 I2C-bus timing diagram; rise and fall times refer to VIL and VIH.
handbook, full pagewidth
PROTOCOL
SCL
SDA
MBD820
BIT 0
LSB
(R/W)
t HD;STA
t
SU;DAT
t
HD;DAT
t
VD;DAT
t SU;STO
t
f
r
t
t
BUF
t
SU;STA
t
LOW
t HIGH
1 / f SCL
START
CONDITION
(S)
BIT 7
MSB
(A7)
BIT 6
(A6)
ACKNOWLEDGE
(A)
STOP
CONDITION
(P)
14 APPLICATION INFORMATION
14.1
Quartz frequency adjustment
14.1.1
METHOD 1: FIXED OSCI CAPACITOR
By evaluating the average capacitance necessary for the
application layout a fixed capacitor can be used.
The frequency is best measured via the 1 Hz signal
available after power-on at the interrupt output (pin 7).
The frequency tolerance depends on the quartz crystal
tolerance, the capacitor tolerance and the
device-to-device tolerance (on average
±5 × 10−6).
Average deviations of
±5 minutes per year can be
achieved.
14.1.2
METHOD 2: OSCI TRIMMER
Using the alarm function (via the I2C-bus) a signal faster
than 1 Hz can be generated at the interrupt output for fast
setting of a trimmer.
Procedure:
• Power-on
• Initialization (alarm functions).
Routine:
• Set clock to time T and set alarm to time T + dT
• At time T + dT (interrupt) repeat routine.
14.1.3
METHOD 3:
Direct measurement of OSC out (accounting for test probe
capacitance).
The PCF8583 slave address has a fixed combination 1010
as group 1.


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