pcf8583 NXP Semiconductors, pcf8583 Datasheet - Page 21

• Manufacturer Part Number: pcf8583
• Description: Clock/calendar With 240 X 8-bit Ram
• Manufacturer: NXP Semiconductors

Philips Semiconductors
14 APPLICATION INFORMATION
14.1
14.1.1
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
Average deviations of 5 minutes per year can be
achieved.
14.1.2
Using the alarm function (via the I
than 1 Hz can be generated at the interrupt output for fast
setting of a trimmer.
1997 Jul 15
handbook, full pagewidth
Clock/calendar with 240
PROTOCOL
SDA
SCL
Quartz frequency adjustment
M
M
ETHOD
ETHOD
t
SU;STA
t
1:
2: OSCI T
BUF
CONDITION
FIXED OSCI CAPACITOR
START
(S)
t HD;STA
Fig.21 I
RIMMER
t
2
LOW
C-bus timing diagram; rise and fall times refer to V
2
r t
C-bus) a signal faster
BIT 7
MSB
(A7)
t HIGH
8-bit RAM
10
6
t
).
t f
SU;DAT
1 / f SCL
BIT 6
(A6)
21
t
Procedure:
Routine:
14.1.3
Direct measurement of OSC out (accounting for test probe
capacitance).
The PCF8583 slave address has a fixed combination 1010
as group 1.
HD;DAT
Power-on
Initialization (alarm functions).
Set clock to time T and set alarm to time T dT
At time T
M
ETHOD
(R/W)
BIT 0
LSB
dT (interrupt) repeat routine.
t
VD;DAT
3:
ACKNOWLEDGE
IL
and V
(A)
MBD820
IH
.
Product specification
CONDITION
PCF8583
STOP
(P)
t SU;STO